Climatological Report (Monthly)
Issued by NWS Marquette, MI

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000
CXUS53 KMQT 122350 AAB
CLMMQT

CLIMATE REPORT...FINAL
NATIONAL WEATHER SERVICE MARQUETTE MI
750 PM EDT SAT OCT 12 2013

...................................

...THE MARQUETTE MI CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1961 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              93   09/09/2002
 LOW               21   09/27/1965
HIGHEST            80   09/06        63      17       84  09/04
LOWEST             35   09/23        44      -9       29  09/27
                        09/22
                        09/16
AVG. MAXIMUM     67.0              65.8     1.2     64.0
AVG. MINIMUM     46.4              45.8     0.6     42.3
MEAN             56.7              55.8     0.9     53.2
DAYS MAX >= 90      0               0.1    -0.1        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               1.6    -1.6        3
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         7.60   1968
 MINIMUM         1.21   1989
TOTALS           2.02              3.72   -1.70     4.21
DAILY AVG.       0.07              0.12   -0.05     0.14
DAYS >= .01        15              13.4     1.6       15
DAYS >= .10         7               7.8    -0.8       10
DAYS >= .50         1               2.5    -1.5        3
DAYS >= 1.00        0               0.7    -0.7        1
GREATEST
 24 HR. TOTAL    0.92   09/19 TO 09/20

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.7   1993
TOTALS            0.0               0.1    -0.1      0.0
SINCE 7/1         0.0               0.1    -0.1      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= 1.0         0               0.0     0.0        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.0   MM

DEGREE_DAYS
HEATING TOTAL     251               297     -46      361
 SINCE 7/1        465               482     -17      451
COOLING TOTAL      10                21     -11       12
 SINCE 1/1        280               241      39      345
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              MM
HIGHEST WIND SPEED/DIRECTION    MM        DATE   MM
HIGHEST GUST SPEED/DIRECTION    38/225    DATE  09/28

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER             MM
NUMBER OF DAYS FAIR          MM
NUMBER OF DAYS PC            MM
NUMBER OF DAYS CLOUDY        MM

AVERAGE RH (PERCENT)     MM

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              2     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       2
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      3
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

&&

...SEPTEMBER 2013 MONTHLY CLIMATE SUMMARY FOR UPPER MICHIGAN...
(THIS DISCUSSION DOES NOT INCLUDE CHIPPEWA AND MACKINAC COUNTIES)

...GENERALLY DRY ESPECIALLY OVER THE WEST...
...DRIEST SEPTEMBER AT ONTONAGON..
...EIGHTH DRIEST SEPTEMBER AT HOUGHTON...

...WARM WEST TO COOL EAST...
...SEVENTH WARMEST SEPTEMBER AT ONTONAGON...

SEPTEMBER CLIMATE STATISTICS FOR THE MARQUETTE NWS IN NEGAUNEE TOWNSHIP

                                    NORMAL   DEPARTURE
AVERAGE TEMPERATURE         56.7     55.8   PLUS    0.9
AVERAGE HIGH TEMPERATURE    67.0     65.8   PLUS    1.2
AVERAGE LOW TEMPERATURE     46.4     45.8   PLUS    0.6
HEATING DEGREE DAYS          251      297  MINUS     46
COOLING DEGREE DAYS           10       21  MINUS     11
TOTAL PRECIPITATION         2.02     3.72  MINUS   1.70
TOTAL SNOWFALL               0.0      0.1  MINUS    0.1

HIGHEST TEMPERATURE:                    80 ON 9/6
LOWEST TEMPERATURE:                     35 ON 9/16...9/22 AND 9/23
GREATEST CALENDAR DAY PRECIPITATION:  0.91 ON 9/19
GREATEST 24 HOUR PRECIPITATION:       0.92 ON 9/19-9/20
GREATEST CALENDAR DAY SNOWFALL:          0
GREATEST 24 HOUR SNOWFALL:               0
PEAK WIND SPEED: 38 MPH FROM THE SOUTHWEST ON 9/28

NO NEW DAILY OR MONTHLY RECORDS ESTABLISHED IN SEPTEMBER 2013
---------------------------------------------------------------------
GREAT LAKES WATER LEVELS (FEET/METERS ABOVE MEAN SEA LEVEL)

                            LAKE SUPERIOR  LAKE MICHIGAN-HURON
9/01/13 DAILY MEAN          601.95/183.48     577.72/176.09
9/30/13 DAILY MEAN          601.88/183.46     577.46/176.01
AVG AUG 2013 DAILY MEAN     601.85/183.44     577.68/176.08
AVG SEP 2012 DAILY MEAN     601.06/183.20     576.97/175.86
LONG TERM SEP DAILY MEAN    602.13/183.53     579.07/176.50
MAXIMUM SEP DAILY MEAN      603.22/183.86     581.96/177.38
                                (1985)           (1986)
MINIMUM SEP DAILY MEAN      600.46/183.02     576.64/175.76
                                (2007)           (1964)

...GREAT LAKES WATER LEVELS FALL SLOWLY IN SEPTEMBER...

AFTER A SIGNIFICANT RISE DURING SPRING AND EARLY SUMMER...THE WATER
LEVEL ON LAKES MICHIGAN/HURON FELL SLOWLY IN SEPTEMBER...ABOUT 3
INCHES TO AROUND 19 INCHES BELOW THE NORMAL LEVEL ON 9/30...DUE TO
INCREASED EVAPORATION AND LOWER PRECIPITATION IN LATE SUMMER. BUT
EVEN WITH THIS SLOW DECLINE...THE WATER LEVEL ON THESE LAKES AT THE
END OF SEPTEMBER IS STILL ABOUT 6 INCHES HIGHER THAN LAST YEAR AT
THIS SAME TIME. WATER LEVELS ON LAKE SUPERIOR REMAINED NEARLY
STEADY...HOLDING ABOUT 2 TO 3 INCHES BELOW THE LONG TERM AVERAGE
THROUGH THE MONTH.

OBTAIN GREAT LAKES WATER LEVEL DATA AS REPORTED BY THE U.S. ARMY
CORPS OF ENGINEERS AT

HTTP://WWW.LRE.USACE.ARMY.MIL/MISSIONS/GREATLAKESINFORMATION/
       GREATLAKESWATERLEVELS/CURRENTCONDITIONS.ASPX (ALL LOWER CASE).
---------------------------------------------------------------------
                      SEPTEMBER CLIMATE HIGHLIGHTS

HIGHEST REPORTED TEMPERATURE...88 AT ESCANABA ON 9/10

LOWEST REPORTED TEMPERATURE...25 AT KENTON IN FAR SOUTHERN HOUGHTON
                               COUNTY ON 9/16

HIGHEST AVERAGE TEMPERATURE...61.0 DEGREES AT ONTONAGON

LOWEST AVERAGE TEMPERATURE...53.9 DEGREES AT STAMBAUGH IN IRON COUNTY

HIGHEST MONTHLY PRECIPITATION...5.10 INCHES AT COOKS IN SCHOOLCRAFT
                                 COUNTY

LOWEST MONTHLY PRECIPITATION...0.39 INCH AT A SPOT NEAR ONTONAGON

A VERY CHANGEABLE UPPER PATTERN DOMINATED THE GREAT LAKES IN
SEPTEMBER 2013...WITH ALTERNATING PERIODS OF WARMER AND COOLER
WEATHER ACCOMPANYING THE PASSAGE OF THE TRANSIENT UPPER RIDGES AND
TROUGHS. DESPITE THIS PROGRESSIVE PATTERN THAT OFTEN RESULTS IN
ACTIVE WEATHER...MOST OF UPPER MICHIGAN MEASURED BELOW NORMAL
RAINFALL IN SEPTEMBER. OBSERVED MONTHLY PRECIPITATION TOTALS RANGED
FROM 1 TO 3 INCHES AT MOST SPOTS...GENERALLY 25 TO 75 PERCENT OF THE
MONTHLY AVERAGE. PORTIONS OF THE WESTERN U.P. FROM BARAGA TO
ONTONAGON LOGGED LESS THAN HALF AN INCH OF MONTHLY PRECIPITATION. IN
FACT...ONLY 0.39 INCH OF RAIN FELL THE WHOLE MONTH AT A LOCATION
JUST INLAND FROM ONTONAGON...A MERE 12 PERCENT OF THE SEPTEMBER
NORM. THE ONLY LOCATIONS THAT SAW ABOVE NORMAL RAINFALL LAST MONTH
WERE OVER THE NORTH HALF OF THE KEWEENAW PENINSULA AND PORTIONS OF
THE SOUTHEAST NEAR LAKE MICHIGAN. BOTH THESE AREAS SAW THE HEAVIEST
SHOWERS AND THUNDERSTORMS DURING MORE WIDESPREAD PRECIPITATION
EVENTS ON 9/1 AND 9/19. NO SNOW FELL ANYWHERE ACROSS UPPER MICHIGAN
IN SEPTEMBER.

ALTHOUGH SOME OF THE DAILY MEAN TEMPERATURE ANOMALIES ACCOMPANYING
THE TRANSIENT RIDGES AND TROUGHS WERE 10 DEGREES OR MORE FROM
NORMAL...THESE EXTREMES TENDED TO BALANCE OUT OVER THE ENTIRE MONTH.
OVERALL...THE WARMER WEATHER PREVAILED MORE OFTEN ACROSS WESTERN
UPPER MICHIGAN...WHERE THE MEAN MONTHLY TEMPERATURE AVERAGED 1 TO 2
DEGREES ABOVE NORMAL AT MOST SPOTS. NEAR ONTONAGON...SEPTEMBER
TEMPERATURES AVERAGED 2.5 DEGREES ABOVE THE MEAN. COOLER CONDITIONS
DOMINATED FARTHER EAST...WITH A MEAN SEPTEMBER TEMPERATURE AROUND A
DEGREE BELOW NORMAL AT MUNISING AND MANISTIQUE. THE RANGE OF MONTHLY
AVERAGE TEMPERATURES BETWEEN ABOUT 54 AND 61 DEGREES WAS 5 TO 9
DEGREES LOWER THAN THE AUGUST REPORTS.

THE COOLEST WEATHER...WITH MEAN DAILY TEMPERATURES UP TO 10 DEGREES
BELOW AVERAGE UNDER AN UPPER TROUGH...OCCURRED NEAR LABOR DAY...AT MID
MONTH AND AGAIN AROUND THE AUTUMNAL EQUINOX. MORNING LOWS DIPPED
INTO THE 20S AT AT LEAST A COUPLE OF THE COLDER INTERIOR LOCATIONS
EARLY ON 9/16...9/17...9/22...9/23 AND 9/24. THE WARMER WEATHER
PREVAILED RIGHT AT THE START OF SEPTEMBER...DURING PORTIONS OF THE
SECOND AND THIRD WEEKS...AND THE LAST WEEK OF THE MONTH. THE MERCURY
TOPPED THE 80 DEGREE MARK ON 9/1...9/6...9/7...9/10...9/11...9/19
AND 9/27.

A POTENT UPPER DISTURBANCE AND SURFACE LOW PRESSURE SYSTEM CROSSED
LAKE SUPERIOR AND INTERACTED WITH A WARM AND HUMID AIRMASS IN PLACE
OVER THE GREAT LAKES ON 9/1...BRINGING LOCALLY HEAVY SHOWERS TO THE
KEWEENAW AND SOME AREAS OVER THE EAST HALF. SOME OF THESE PLACES
MEASURED AN INCH OR MORE OF RAIN. UP TO 2 INCHES FELL AT COOKS IN
SCHOOLCRAFT COUNTY AND CALUMET...WHERE SOME STREET FLOODING
ACCOMPANIED THESE TORRENTIAL DOWNPOURS. A SEVERE THUNDERSTORM STRUCK
NEAR THIS SAME AREA IN THE EVENING ON 9/9 CLOSE TO A WARM FRONT
SITUATED OVER LAKE SUPERIOR. MOHAWK IN KEWEENAW COUNTY OBSERVED
QUARTER-SIZED HAIL AND 1.87 INCHES OF RAIN AS THIS STORM PASSED
OVERHEAD.

AFTER THE SPELL OF CHILLY WEATHER AT MID MONTH...A WARM FRONT MOVING
SLOWLY THROUGH THE UPPER GREAT LAKES ALLOWED FOR A RETURN OF VERY
WARM AND HUMID AIR ON 9/19 INTO 9/20. THE PASSAGE OF THIS WARM FRONT
EARLY ON 9/19 AND THEN A LOW PRESSURE TROUGH ON 9/20 RESULTED IN
SOME LOCALLY HEAVY SHOWERS AND THUNDERSTORMS AWAY FROM NORTHWEST
UPPER MICHIGAN. AN INCH OR MORE OF RAIN FELL AT SOME LOCATIONS ALONG
AND SOUTHEAST OF A LINE FROM IRON RIVER TO MARQUETTE OVER THIS 2-DAY
PERIOD...INCLUDING 2.08 INCHES AT GARDEN CORNERS IN DELTA COUNTY.
MUCH COOLER AND DRIER AIR FOLLOWED A REINFORCING COLD FRONTAL
PASSAGE IN THE AFTERNOON ON 9/20 THAT ENDED THIS ROUND OF
PRECIPITATION. THE LAST WEEK OF SEPTEMBER WAS WARMER AND GENERALLY
DRY EXCEPT DURING THE NIGHT ON 9/28-9/29...WHEN A LINE OF SHOWERS IN
ADVANCE OF A WEAK COLD FRONT CROSSED THE UPPER GREAT LAKES AND
DROPPED UP TO 0.25 TO 0.33 INCH OF RAIN.
---------------------------------------------------------------------
                  ...VERY WET SINCE LAST WINTER...

DESPITE THE GENERALLY DRY WEATHER IN SEPTEMBER...PRECIPITATION IN
THE MARCH THROUGH AUGUST TIME PERIOD WAS SO HEAVY THAT THE MARCH
THROUGH SEPTEMBER 2013 TIME PERIOD STILL RANKS AMONG THE TOP 25
WETTEST AT SOME LOCATIONS.

                 MARCH-SEPTEMBER 2013 PRECIPITATION

                                               RECORD
              OBSERVED  NORMAL  DEPARTURE  /OR PREVIOUS/   2013 RANK

IRONWOOD       38.21    22.94    +15.27    37.12 /1942/    NEW RECORD

NEWBERRY       25.66    20.22     +5.44    31.39 /2002/   5TH HIGHEST

MARQUETTE NWS  24.22    21.54     +2.68    33.39 /1977/  12TH HIGHEST

MANISTIQUE     23.25    19.23     +4.02    29.37 /2002/  15TH HIGHEST

HOUGHTON       23.66    16.83     +6.83    31.02 /1955/  17TH HIGHEST

MUNISING       23.09    20.45     +2.64    31.56 /1960/  18TH HIGHEST

MARQUETTE CITY 21.75    18.27     +3.48    30.57 /1960/      ****

IRON MOUNTAIN  22.47    20.86     +1.61    30.16 /1942/      ****

**** NOT IN TOP 25
---------------------------------------------------------------------
SOME OTHER TEMPERATURE AND PRECIPITATION OBSERVATIONS ACROSS UPPER
MICHIGAN IN SEPTEMBER 2013 INCLUDE:

IRONWOOD...AVERAGE TEMPERATURE 57.2 (1.5 DEGREES ABOVE NORMAL)
           PRECIPITATION 1.80 INCHES (2.26 INCHES BELOW NORMAL)

ONTONAGON...AVERAGE TEMPERATURE 61.0 (2.5 DEGREES ABOVE NORMAL)
 (6 MILES   PRECIPITATION 0.39 INCH (2.89 INCHES BELOW NORMAL)
  INLAND)

GREENLAND (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 56.6 DEGREES
                               PRECIPITATION 0.73 INCH

BERGLAND DAM (ONTONAGON COUNTY)...AVERAGE TEMPERATURE 55.9 DEGREES
                                  PRECIPITATION 1.24 INCHES

HOUGHTON COUNTY...AVERAGE TEMPERATURE 56.8 (1.4 DEGREES ABOVE NORMAL)
 AIRPORT          PRECIPITATION 1.25 INCHES (2.20 INCHES BELOW NORMAL)

ATLANTIC MINE (HOUGHTON COUNTY)...PRECIPITATION 1.21 INCHES

MOHAWK (KEWEENAW COUNTY)...PRECIPITATION 4.70 INCHES

COPPER HARBOR...AVERAGE TEMPERATURE 58.0 DEGREES
                PRECIPITATION 2.12 INCHES

JACOBSVILLE (HOUGHTON COUNTY)...AVERAGE TEMPERATURE 55.0 DEGREES
                                PRECIPITATION 0.95 INCH

BARAGA...AVERAGE TEMPERATURE 58.4 DEGREES
         PRECIPITATION 0.44 INCH

WATTON (BARAGA COUNTY)...AVERAGE TEMPERATURE 54.9 DEGREES
                         PRECIPITATION 0.75 INCH

HERMAN (BARAGA COUNTY)...PRECIPITATION 1.77 INCHES

CLARKSBURG (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 54.4 DEGREES
                                PRECIPITATION 1.45 INCHES

WITCH LAKE (MARQUETTE COUNTY)...PRECIPITATION 1.29 INCHES

BIG BAY (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 57.6 DEGREES
                             PRECIPITATION 0.97 INCH

MARQUETTE CITY...AVERAGE TEMPERATURE 59.8 (0.4 DEGREE ABOVE NORMAL)
                 PRECIPITATION 2.56 INCHES (0.60 INCH BELOW NORMAL)

HARVEY (MARQUETTE COUNTY)...AVERAGE TEMPERATURE 58.8 DEGREES
                            PRECIPITATION 2.52 INCHES

GWINN (MARQUETTE COUNTY)...PRECIPITATION 2.88 INCHES

CHATHAM (ALGER COUNTY)...AVERAGE TEMPERATURE 56.7 DEGREES
                         PRECIPITATION 2.71 INCHES

MUNISING...AVERAGE TEMPERATURE 56.3 (1.0 DEGREE BELOW NORMAL)
           PRECIPITATION 3.04 INCHES (1.03 INCH BELOW NORMAL)

WETMORE (ALGER COUNTY)...PRECIPITATION 3.68 INCHES
(15 MILES SOUTH)

NEWBERRY...AVERAGE TEMPERATURE 56.8 (0.3 DEGREE BELOW NORMAL)
           PRECIPITATION 2.63 INCHES (1.18 INCHES BELOW NORMAL)

STAMBAUGH (IRON COUNTY)...AVERAGE TEMPERATURE 53.9 DEGREES
                          PRECIPITATION 2.08 INCHES

AMASA (IRON COUNTY)...PRECIPITATION 1.49 INCHES

IRON MOUNTAIN...AVERAGE TEMPERATURE 58.5 (0.9 DEGREE ABOVE NORMAL)
                PRECIPITATION 2.17 INCHES (1.45 INCHES BELOW NORMAL)

NORWAY (DICKINSON COUNTY)...AVERAGE TEMPERATURE 58.3 DEGREES
                            PRECIPITATION 1.36 INCHES

DAGGETT (MENOMINEE COUNTY)...PRECIPITATION 2.20 INCHES

MENOMINEE...PRECIPITATION 1.40 INCHES

ESCANABA...AVERAGE TEMPERATURE 56.2 DEGREES
           PRECIPITATION 1.85 INCHES

GLADSTONE (DELTA COUNTY)...PRECIPITATION 1.81 INCHES

GARDEN CORNERS (DELTA COUNTY)...AVERAGE TEMPERATURE 55.9 DEGREES
                                PRECIPITATION 4.49 INCHES

COOKS (SCHOOLCRAFT COUNTY)...PRECIPITATION 5.10 INCHES

MANISTIQUE...AVERAGE TEMPERATURE 56.0 (1.0 DEGREE BELOW NORMAL)
             PRECIPITATION 3.07 INCHES (0.69 INCH BELOW NORMAL)

                       SEPTEMBER WEATHER SUMMARY

SEPTEMBER BEGAN ACROSS UPPER MICHIGAN ON A WET NOTE AS A POTENT
UPPER DISTURBANCE AND SURFACE LOW PRESSURE SYSTEM CROSSED LAKE
SUPERIOR AND INTERACTED WITH A WARM AND HUMID AIRMASS IN PLACE OVER
THE GREAT LAKES ON 9/1. LOCALLY HEAVY SHOWERS AND SOME THUNDERSTORMS
IMPACTED THE KEWEENAW AND SOME AREAS OVER THE EAST HALF. SOME OF
THESE LOCATIONS MEASURED AN INCH OR MORE OF RAIN. UP TO 2 INCHES
FELL AT COOKS IN SCHOOLCRAFT COUNTY AND CALUMET...WHERE SOME STREET
FLOODING ACCOMPANIED THESE TORRENTIAL DOWNPOURS. A SWATH OVER
CENTRAL UPPER MICHIGAN PICKED UP MUCH LESS RAIN...GENERALLY UNDER
0.10 TO 0.25 INCH. MEAN DAILY TEMPERATURES AVERAGED FROM NEAR NORMAL
TO AS MUCH AS 5 DEGREES ABOVE AVERAGE ON 9/1. THE HEAVIER SHOWERS
ENDED BY THE EVENING ON 9/1 AS THE LOW PRESSURE SYSTEM SHIFTED
FARTHER EAST INTO SOUTHEAST CANADA. NORTHWEST WINDS GUSTING AS HIGH
AS 30 MPH NEAR LAKE SUPERIOR INTO THE MORNING ON 9/2 DREW COOLER AIR
INTO THE AREA AND CAUSED PLENTY OF CLOUDS AND SPRINKLES TO LINGER
NEAR LAKE SUPERIOR. THE APPROACH OF HIGH PRESSURE ON 9/2 THEN CAUSED
A SLOW CLEARING TREND AND DIMINISHING WINDS. THE DAY ON 9/3 TURNED
OUT MOSTLY SUNNY AND PLEASANT WITH THE HIGH PRESSURE SITUATED OVER
THE UPPER MIDWEST. THE MERCURY AVERAGED 5 TO 10 DEGREES BELOW
AVERAGE ON 9/2...BUT READINGS RECOVERED BACK TO NEAR NORMAL ON 9/3.

ALTHOUGH A COLD FRONT SWUNG THROUGH UPPER MICHIGAN AND WAS FOLLOWED
BY NORTH WINDS GUSTING AS HIGH AS 35 TO 45 MPH AT EXPOSED LOCATIONS
NEAR LAKE SUPERIOR DURING THE NIGHT ON 9/3-9/4...THE AIRMASS IN
PLACE WAS SO DRY THE FRONTAL PASSAGE WAS ACCOMPANIED BY LOTS OF
CLOUDS BUT NOTHING MORE THAN A FEW SPRINKLES. LINGERING CLOUDS IN
THE MORNING ON 9/4 GAVE WAY TO MOSTLY CLEAR SKIES THAT PERSISTED
THROUGH 9/5 AS TRAILING HIGH PRESSURE BUILT INTO THE UPPER LAKES. THE
ARRIVAL OF THIS COOL CANADIAN AIRMASS DROPPED MEAN DAILY
TEMPERATURES ON 9/4 AND 9/5 TO 5 TO 10 DEGREES BELOW NORMAL...AND
LOW TEMPERATURES IN THE CHILLY 30S WERE COMMON AT SOME OF THE
INTERIOR LOCATIONS IN THE MORNING ON 9/5.

INCREASING CLOUDS IN THE MORNING ON 9/6 HERALDED THE APPROACH OF AN
UPPER DISTURBANCE MOVING THROUGH SOUTH CENTRAL CANADA. SCATTERED
SHOWERS AND THUNDERSTORMS DEVELOPED IN THE AFTERNOON OF 9/6 AND WERE
MOST NUMEROUS OVER THE EAST. BY THE TIME THESE SHOWERS DIMINISHED BY
LATE EVENING WITH THE LOSS OF DAYTIME HEATING...AS MUCH AS 1.11
INCHES OF RAIN HAD FALLEN NEAR NEWBERRY. RAINFALL WAS GENERALLY
UNDER 0.25 INCH AT MOST OTHER LOCATIONS. MEAN DAILY TEMPERATURES ON
9/6 AND 9/7 ROSE TO 5 TO 10 DEGREES ABOVE NORMAL...BUT ANOTHER
COOLER CANADIAN AIRMASS FOLLOWED A COLD FRONTAL PASSAGE ON 9/7.
ALTHOUGH THIS FRONT BROUGHT MORE CLOUDS ALONG WITH SOME DRIZZLE AND
FOG TO AREAS NEAR LAKE SUPERIOR FOR A TIME ON 9/7...AS WAS THE CASE
A FEW DAYS BEFORE...THE AIRMASS WAS TOO DRY FOR ANY SUBSTANTIAL
PRECIPITATION. HIGH PRESSURE MOVING THROUGH ONTARIO BROUGHT SOME
PARTIAL CLEARING ON 9/8 ALONG WITH A NEAR NORMAL MEAN TEMPERATURE.

CLOUDS THICKENED DURING THE NIGHT ON 9/8-9/9 IN ADVANCE OF AN
APPROACHING WARM FRONT...AND SOME SHOWERS FOLLOWED DURING THE DAY ON
9/9. MORE WIDESPREAD SHOWERS AND SOME THUNDERSTORMS IMPACTED MAINLY
THE KEWEENAW AND AREAS NEAR LAKE SUPERIOR EAST OF MUNISING DURING
THE NIGHT ON 9/9-9/10 AS THE WARM FRONT PASSED TO THE NORTH. ONE OF
THE THUNDERSTORMS OVER THE KEWEENAW TURNED SEVERE IN THE EVENING ON
9/9 CLOSE TO THE WARM FRONT SITUATED OVER LAKE SUPERIOR. MOHAWK IN
KEWEENAW COUNTY OBSERVED QUARTER-SIZED HAIL AND 1.87 INCHES OF RAIN
AS THIS STORM PASSED OVERHEAD. AWAY FROM THE KEWEENAW AND THE LAKE
SUPERIOR SHORE OVER THE EAST...MOST PLACES MEASURED LESS THAN 0.10
INCH OF RAIN DURING THIS EVENT. A WEAK COLD FRONTAL PASSAGE ON 9/10
CLEARED OUT SOME FOG THAT HAD DEVELOPED IN THE EARLY MORNING AND
ENDED THE THREAT FOR ANY ADDITIONAL PRECIPITATION AS WEST WINDS
GUSTING TO 25 MPH ADVECTED DRIER AIR INTO UPPER MICHIGAN. MEAN DAILY
TEMPERATURES NOT FAR FROM NORMAL HELD DOWN BY THE THICKER CLOUDS
AHEAD OF THE WARM FRONT ON 9/9 WARMED TO AS MUCH AS 10 DEGREES ABOVE
AVERAGE ON 9/10 WITH THE RETURN OF PARTIAL SUNSHINE THAT LIFTED HIGH
TEMPERATURES INTO THE 80S AT SOME PLACES.

A WEAK RIDGE OF HIGH PRESSURE THEN BROUGHT A BRIEF PERIOD OF DRY
WEATHER INTO 9/11...BUT A BAND OF SHOWERS AND A FEW THUNDERSTORMS
MOVED BACK INTO THE AREA IN THE AFTERNOON AHEAD OF YET ANOTHER COLD
FRONT ASSOCIATED WITH AN UPPER DISTURBANCE MOVING THROUGH NORTHWEST
ONTARIO. ALTHOUGH MOST PLACES SAW NO MORE THAN 0.25 INCH OF RAIN...
SOME LOCATIONS FROM SENEY IN SCHOOLCRAFT COUNTY TO NEWBERRY AND
TAHQUAMENON FALLS IN LUCE COUNTY SAW AROUND 0.50 INCH ON 9/11. AHEAD
OF THE COLD FRONT...MEAN DAILY TEMPERATURES ON 9/11 ROSE TO AROUND
10 DEGREES ABOVE NORMAL WITH MORE 80-DEGREE MAXIMUMS AT SOME PLACES.
BUT FOLLOWING THE FRONTAL PASSAGE IN THE EARLY MORNING OF 9/12...A
GUSTY NORTH WIND UP TO 30 MPH IN ADVANCE OF HIGH PRESSURE MOVING
INTO MINNESOTA DROVE MUCH COOLER AIR BACK OVER UPPER MICHIGAN AS AN
UPPER TROUGH DEEPENED INTO THE GREAT LAKES. CLOUDS AND SOME LIGHT
SHOWERS ALSO WERE THE RULE ON 9/12...MAINLY OVER THE HIGHER TERRAIN
NEAR LAKE SUPERIOR...WHERE THE MERCURY FAILED TO RISE OUT OF THE 50S
AFTER THE SUMMER-LIKE WARMTH THE DAY BEFORE. THESE CLOUDS AND
SCATTERED SHOWERS LINGERED THROUGH THE EVENING ON 9/12...BUT THE
CLOSER APPROACH OF THE HIGH DELIVERED DRY WEATHER AND SOME SUNSHINE
IN TIME FOR 9/13. THE THERMOMETER AVERAGED AROUND 10 DEGREES BELOW
AVERAGE ON BOTH 9/12 AND 9/13.

AS THE HIGH SHIFTED TO THE EAST ON 9/14...A SOUTHWEST FLOW BRIEFLY
RETURNED SOME WARMER AIR TO UPPER MICHIGAN...LIFTING THE MEAN DAILY
TEMPERATURE BACK TO WITHIN A FEW DEGREES OF NORMAL DESPITE A CHILLY
START UNDER THE HIGH AND AN INCREASE IN AFTERNOON CLOUD COVER AHEAD
OF AN APPROACHING COLD FRONT. THICKER CLOUDS AND SOME SHOWERS
OVERSPREAD THE U.P. DURING THE NIGHT ON 9/14-9/15 BEFORE CLEARING
THE EAST IN THE MORNING ON 9/15 FOLLOWING THE FRONTAL PASSAGE. EVEN
AFTER THE WIDESPREAD SHOWERS ENDED...LOTS OF CLOUDS AND SOME DRIZZLE
PERSISTED MAINLY OVER THE HIGHER TERRAIN NEAR LAKE SUPERIOR THROUGH
MUCH OF 9/15. MOST PLACES PICKED UP NO MORE THAN 0.10 TO 0.25 INCH
OF RAIN DURING THIS EVENT...BUT AS MUCH AS 0.50 INCH FELL AT MOHAWK.
LINGERING CLOUDS TENDED TO BREAK UP DURING THE NIGHT ON 9/15-9/16 AS
CANADIAN HIGH PRESSURE SHIFTED OVER THE UPPER GREAT LAKES BY
DAYBREAK. SOME INTERIOR LOCATIONS REPORTED A LOW IN THE 20S AT DAWN
ON 9/16...INCLUDING A CHILLY 25 AT KENTON IN FAR SOUTHERN HOUGHTON
COUNTY. WITH THE HIGH PRESSURE DOMINATING...DRY WEATHER PERSISTED
THROUGH 9/17. THE OVERNIGHT ON 9/16-9/17 WAS ANOTHER COLD ONE INLAND
FROM THE GREAT LAKES...WHERE SOME LOCATIONS OVER THE INTERIOR EAST
AND CENTRAL SAW THE THERMOMETER DIP INTO THE 20S AGAIN. THE
AFTERNOON ON 9/17 TURNED WARMER ONCE THE HIGH SHIFTED TO THE EAST
AND A SOUTHWEST FLOW BROUGHT A RETURN OF WARMER AIR UNDER A BUILDING
UPPER RIDGE. MEAN DAILY TEMPERATURES AROUND 10 DEGREES BELOW NORMAL
ON 9/16 REBOUNDED TO NEAR AVERAGE ON 9/17 WITH THE WARMER AFTERNOON.

MORE CLOUDS AND SOME SHOWERS...ALONG WITH A FEW THUNDERSTORMS...
RETURNED ON 9/18 INTO 9/19 AS A WARM FRONT EAST OF DEEPENING LOW
PRESSURE IN THE PLAINS BEGAN TO MOVE NORTH. THE PASSAGE OF THE WARM
FRONT ON 9/19 AS THE LOW MOVED INTO CANADA ALLOWED A VERY WARM AND
HUMID AIRMASS TO SURGE INTO THE AREA...LIFTING HIGH TEMPERATURES
INTO THE 80S AT SOME PLACES IN THE AFTERNOON OF 9/19 WITH THE RETURN
OF SOME SUNSHINE. AS A LOW PRESSURE TROUGH MOVED EAST AND LIFTED
THIS WARM AND MOIST AIRMASS...MORE SHOWERS AND THUNDERSTORMS
IMPACTED THE AREA LATE IN THE AFTERNOON THROUGH THE EVENING BEFORE
THE PASSAGE OF THE TROUGH EARLY ON 9/20 GREATLY DIMINISHED THIS
ACTIVITY. A STRONGER COLD FRONT SWEPT THROUGH THE AREA IN THE
AFTERNOON ON 9/20...ENDING ANY LINGERING SHOWERS AND BRINGING A
RETURN OF COOLER AIR TO UPPER MICHIGAN. MANY LOCATIONS ALONG AND
SOUTHEAST OF A LINE FROM IRON RIVER TO MARQUETTE PICKED UP 0.50 TO
1.00 INCH OF RAIN OR MORE FROM 9/18 INTO 9/20...INCLUDING 2.08
INCHES AT GARDEN CORNERS IN DELTA COUNTY. NORTHWEST UPPER MICHIGAN
MISSED OUT ON THE BULK OF PRECIPITATION...WITH MOST PLACES THERE
MEASURING NO MORE THAN 0.10 TO 0.25 INCH DURING THIS 2-DAY PERIOD. A
NEAR NORMAL MEAN DAILY TEMPERATURE ON 9/18 ROSE TO 10 TO 20 DEGREES
ABOVE AVERAGE ON 9/19 FOLLOWING THE WARM FRONTAL PASSAGE. THE
MERCURY AVERAGED AROUND 5 DEGREES ABOVE NORMAL ON 9/20.

AS AN UPPER TROUGH DEEPENED INTO THE GREAT LAKES ON 9/21 INTO
9/23...COOLER AIR STREAMED INTO THE AREA IN THE STEADY NORTH WIND
EAST OF HIGH PRESSURE MOVING EAST THROUGH SOUTH CENTRAL CANADA. SOME
LAKE EFFECT RAIN SHOWERS POPPED UP NEAR LAKE SUPERIOR ON 9/21 INTO
9/22 AS THIS COOLER AIR PASSED OVER THE RELATIVELY WARM LAKE WATERS.
RAINFALL AMOUNTS WERE GENERALLY 0.05 TO 0.15 INCH WHERE THESE
SHOWERS OCCURRED. UNDER PLENTY OF CLOUDS...THE MERCURY ON BOTH THESE
DAYS FAILED TO REACH 50 AT SOME OF THE COOLER...HIGHER TERRAIN
LOCATIONS OVER THE NORTH CENTRAL AND WEST. THERE WERE SOME MINIMUM
READINGS IN THE 20S AS WELL EARLY ON 9/22. MEAN DAILY TEMPERATURES
ON BOTH 9/21 AND 9/22 RAN AROUND 10 DEGREES BELOW AVERAGE. AS THE
HIGH CENTER SHIFTED TO THE EAST...THE CLOUDS AND SHOWERS DISSIPATED
LATER ON 9/22...SETTING THE STAGE FOR A CHILLY OVERNIGHT ON 9/22-
9/23 UNDER A MOSTLY CLEAR SKY. A LOCATION NEAR NEWBERRY REPORTED A
LOW OF 26 AT DAYBREAK ON 9/23. DESPITE THE CHILLY START TO THE
DAY...A RETURN SOUTHWEST FLOW ON THE WESTERN FLANK OF HIGH PRESSURE
SHIFTING TO THE EAST IN TANDEM WITH AT LEAST PARTIAL SUNSHINE
ALLOWED HIGH TEMPERATURES TO RECOVER BACK TO MORE TYPICAL SEPTEMBER
READINGS IN THE AFTERNOON. MEAN DAILY TEMPERATURES ON 9/23 ENDED UP
BETWEEN NORMAL AND 5 DEGREES BELOW AVERAGE.

SURFACE HIGH PRESSURE DRIFTED ONLY SLOWLY TO THE EAST ON 9/23
INTO 9/28 AS A NEARLY STATIONARY UPPER RIDGE DEVELOPED OVER THE
GREAT LAKES...RESULTING IN DRY CONDITIONS ACROSS UPPER MICHIGAN. THE
ONLY WEATHER WAS AREAS OF FOG AND LOW CLOUDS THAT DEVELOPED OVER THE
INTERIOR AT NIGHT WITH NOCTURNAL COOLING. SOME OF THIS FOG BECAME
DENSE. MEAN DAILY TEMPERATURES AROUND 5 DEGREES ABOVE NORMAL ON 9/24
THROUGH 9/26 WARMED TO 10 TO 15 DEGREES ABOVE AVERAGE ON 9/27 AND
9/28 AS A STRONGER SOUTH WIND AHEAD OF AN APPROACHING COLD FRONT
ADVECTED WARMER AIR INTO THE UPPER GREAT LAKES AND LIMITED FOG
DEVELOPMENT DURING THE NIGHT ON 9/27-9/28. THESE SOUTH WINDS GUSTED
AS HIGH AS 35 TO 45 MPH ON 9/28 AS CLOUDS AND SHOWERS AHEAD OF THE
FRONT MOVED INTO THE AREA. THE COLD FRONT AND BAND OF SHOWERS
CROSSED THE U.P. DURING THE NIGHT ON 9/28-9/29...DROPPING 0.10 TO
0.40 INCH OF RAIN AT MOST PLACES. THE MONTH ENDED ON A DRY NOTE AS
TRAILING HIGH PRESSURE MOVED ACROSS THE GREAT LAKES. BUT THE AIRMASS
BEHIND THE COLD FRONT WAS NOT PARTICULARLY CHILLY...SO MEAN DAILY
TEMPERATURES ON 9/29 AND 9/30 REMAINED 5 TO 10 DEGREES ABOVE NORMAL.

                         OCTOBER FORECAST

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING A GREATER THAN
CLIMATOLOGICAL CHANCE OF AN ABOVE NORMAL MONTHLY MEAN TEMPERATURE BUT
EQUAL CHANCES OF ABOVE AND BELOW NORMAL MONTHLY PRECIPITATION OVER
ALL OF UPPER MICHIGAN IN OCTOBER 2013.

                        OCTOBER CLIMATOLOGY

AVERAGE TEMPERATURES IN OCTOBER CONTINUE THEIR DOWNWARD SPIRAL AS
THE SUN STAYS UP LESS AND LESS EACH DAY. THE OCTOBER MEAN
TEMPERATURE ACROSS UPPER MICHIGAN IS ABOUT TEN DEGREES LOWER THAN IN
SEPTEMBER AT MOST PLACES. POSSIBLE DAILY SUNSHINE DECREASES ABOUT 3
OR 4 MINUTES EVERY DAY DURING THE TENTH MONTH FROM 703 MINUTES ON
10/1 TO 607 MINUTES ON HALLOWEEN.

ALTHOUGH AVERAGE TEMPERATURES DECREASE DURING OCTOBER...RECORD HIGH
TEMPERATURES AT MANY PLACES IN UPPER MICHIGAN ARE STILL IN THE 80S
DURING THE FIRST WEEK OF THE MONTH. IN FACT...RESIDENTS OF IRON
MOUNTAIN BASKED IN A SUMMER-LIKE HIGH OF 88 ON 10/3/92. DOWNTOWN
MARQUETTE ENJOYED A TASTE OF SUMMER EVEN AS LATE AS 10/18 IN 1950...
WHEN THE MERCURY REACHED A BALMY 86 DEGREES.

BUT BY THE END OF OCTOBER...THE ICY HAND OF WINTER USUALLY BEGINS TO
GRIP UPPER MICHIGAN HARDER AND HARDER. RECORD LOW TEMPERATURES AT
MONTHS END FALL INTO THE TEENS EVERYWHERE AND EVEN AS LOW AS THE
SINGLE NUMBERS ABOVE ZERO AWAY FROM THE WARMING INFLUENCE OF LAKE
SUPERIOR. ON 10/30/1925...IRONWOOD RECORDED A LOW OF 2 DEGREES ABOVE
ZERO. OCTOBER 2002 WAS THE COLDEST OCTOBER ON RECORD AT THE
MARQUETTE NWS...AND AMONG THE TOP TEN COLDEST AT IRONWOOD AND IRON
MOUNTAIN. MONTHLY TEMPERATURES AVERAGED 4 TO 6 DEGREES BELOW NORMAL
ACROSS UPPER MICHIGAN. OCTOBER 2009 WAS ALSO QUITE CHILLY WITH AN
AVERAGE MONTHLY TEMPERATURE 3 TO 5 DEGREES BELOW THE MEAN. MUNISING
REPORTED THE COLDEST OCTOBER ON RECORD IN 2009...AND MANY PLACES
EXPERIENCED A TOP FIVE OR TEN COLDEST TENTH MONTH.

EVEN THOUGH AVERAGE PRECIPITATION IN OCTOBER IS LOWER THAN IN
SEPTEMBER AT MOST SPOTS...THE RESIDUAL WARMTH OF LAKE SUPERIOR
USUALLY CAUSES INCREASED LAKE EFFECT RAIN AND SNOW SHOWER ACTIVITY
DURING THE TENTH MONTH. MORE NUMEROUS ARCTIC AIR MASSES PLUNGING
SOUTH FROM CANADA ARE DESTABILIZED AS THEY CROSS THE RELATIVELY WARM
WATER...RESULTING IN THE INCREASED CONVECTIVE ACTIVITY. IF THE AIR
IS COLD ENOUGH...HEAVY SNOW CAN FALL...ESPECIALLY OVER HIGHER
TERRAIN JUST DOWNWIND OF LAKE SUPERIOR. BETWEEN 10/11 AND 10/14 IN
2006...AN UNUSUALLY EARLY WINTER STORM BLASTED THE HIGHER TERRAIN OF
THE WEST HALF OF UPPER MICHIGAN WITH 20 OR MORE INCHES OF SNOW...
INCLUDING AS MUCH AS 26.6 INCHES AT TWIN LAKES IN HOUGHTON COUNTY.
IN OCTOBER 1967...ALMOST 27 INCHES OF SNOW WHITENED IRONWOOD...
INCLUDING 15 INCHES ON 10/25/67. HEAVY SNOW CAN FALL EVEN EARLIER IN
THE MONTH. ON 10/6 TO 10/8 IN 2000...UP TO A FOOT OF SNOW SMOTHERED
THE HIGHER TERRAIN OF NORTH CENTRAL UPPER MICHIGAN. BUT DURING WARM
OCTOBERS...LITTLE OR NO SNOW CAN FALL AS WELL. THE MARQUETTE NWS SAW
NO SNOW AT ALL IN OCTOBER 1971...AS DID THE HOUGHTON COUNTY AIRPORT
IN 1986.

THE SAME SURFACE HEATING AND DESTABILIZATION OF COLD AIRMASSES THAT
CAUSES LAKE EFFECT SNOW ALSO RESULTS IN INCREASED WINDINESS OVER
LAKE SUPERIOR. THE GALES OF NOVEMBER OFTEN DO COME EARLY DURING
OCTOBER.

                  OUTLOOK FOR LATE FALL INTO WINTER

THE CLIMATE PREDICTION CENTER (CPC) IS FORECASTING EQUAL CHANCES OF
AN ABOVE AND BELOW NORMAL 3-MONTH MEAN TEMPERATURE AND 3-MONTH
PRECIPITATION OVER ALL OF UPPER MICHIGAN DURING NOVEMBER 2013
THROUGH JANUARY 2014.

GO TO HTTP://WWW.WEATHER.GOV/CLIMATE/L3MTO.PHP TO ACCESS DETAILED
LOCAL THREE-MONTH AVERAGE TEMPERATURE OUTLOOKS FOR A NUMBER OF SITES
IN UPPER MICHIGAN.

CHECK OUT HTTP://WWW.CPC.NCEP.NOAA.GOV FOR MORE INFORMATION ABOUT
THE CLIMATE PREDICTION CENTER AND MORE LONG RANGE PREDICTIONS.

NOTE THAT STATISTICS FOR THE NATIONAL WEATHER SERVICE OFFICE IN
NEGAUNEE TOWNSHIP ARE BASED ON RECORDS WHICH BEGAN IN OCTOBER 1961.
THIRTY YEAR NORMALS USED ARE FOR THE PERIOD OF 1981 THROUGH 2010.
NOTE ALL TEMPERATURES ARE IN FAHRENHEIT AND PRECIPITATION IS IN
INCHES. ALL CLIMATE DATA LISTED IN THIS PRODUCT ARE UNOFFICIAL. FOR
OFFICIAL DATA...PLEASE REFER TO THE NATIONAL CLIMATIC DATA CENTER.
ALSO NOTE THIS DISCUSSION DOES NOT INCLUDE DATA FROM CHIPPEWA AND
MACKINAC COUNTIES.

NWS MARQUETTE WEB PAGE IS AT HTTP://WWW.WEATHER.GOV/MQT (ALL LOWER
CASE). CONTACT THE NATIONAL CLIMATIC DATA CENTER AT (828) 271-4800
OR WWW.NCDC.NOAA.GOV.

$$

KC





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