Climatological Report (Monthly)
Issued by NWS Grand Rapids, MI

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CXUS53 KGRR 011239
CLMGRR

CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
827 AM EDT SUN SEP 1 2013

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

...THE GRAND RAPIDS MI CLIMATE SUMMARY FOR THE MONTH OF AUGUST 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1892 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             102   08/06/1918
 LOW               39   08/30/1976
HIGHEST            92   08/27        90       2       93  08/03
LOWEST             48   08/15        45       3       48  08/18
AVG. MAXIMUM     80.6              80.6     0.0     82.0
AVG. MINIMUM     59.5              61.0    -1.5     59.7
MEAN             70.1              70.8    -0.7     70.8
DAYS MAX >= 90      1               2.3    -1.3        4
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.0     0.0        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.46   1987
 MINIMUM         0.13   1899
TOTALS           1.90              3.59   -1.69     3.34
DAILY AVG.       0.06              0.12   -0.06     0.11
DAYS >= .01         7               9.6    -2.6        8
DAYS >= .10         4               6.1    -2.1        6
DAYS >= .50         1               2.6    -1.6        2
DAYS >= 1.00        0               0.9    -0.9        1
GREATEST
 24 HR. TOTAL    0.90   08/27 TO 08/28

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

DEGREE_DAYS
HEATING TOTAL      15                14       1        9
 SINCE 7/1         26                20       6        9
COOLING TOTAL     181               194     -13      197
 SINCE 1/1        670               625      45      962

FREEZE DATES
RECORD
 EARLIEST     09/03/1946
 LATEST       06/04/1945
EARLIEST                        10/13
LATEST                          05/02
..................................................

WIND (MPH)
AVERAGE WIND SPEED              6.1
RESULTANT WIND SPEED/DIRECTION   2/249
HIGHEST WIND SPEED/DIRECTION    29/310    DATE  08/21
HIGHEST GUST SPEED/DIRECTION    39/280    DATE  08/21

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   72
AVERAGE SKY COVER           0.40

AVERAGE RH (PERCENT)     68

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              5     MIXED PRECIP               0
HEAVY RAIN                5     RAIN                       6
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      17     FOG W/VIS <= 1/4 MILE      1
HAZE                     11

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

&&

AUGUST 2013 WAS CHARACTERIZED MOSTLY BY CONSISTENT BELOW NORMAL
TEMPERATURES. THE LAST WEEK OF THE MONTH... WITH ABOVE NORMAL
TEMPERATURES... WAS THE EXCEPTION. PRECIPITATION WAS BELOW NORMAL
FOR AREAS MAINLY WEST OF U.S. 131 AND ABOVE NORMAL IN AREAS TO THE
EAST.

TEMPERATURES WERE CONSISTENTLY BELOW NORMAL ACROSS SOUTHWEST LOWER
MICHIGAN FOR THE FIRST THREE WEEKS OF THE MONTH. GRAND RAPIDS...
LANSING AND MUSKEGON ALL HIT THEIR MONTHLY LOW TEMPERATURES RIGHT
AROUND THE MIDPOINT OF THE MONTH... ON THE 14TH AND 15TH OF AUGUST.
THE MERCURY FAILED TO REACH 80 DEGREES IN GRAND RAPIDS UNTIL AUGUST
7TH... BRINGING AN END TO A STREAK OF 14 CONSECUTIVE DAYS OF SUB-80
DEGREE WEATHER. LANSING AND MUSKEGON DID NOT HIT 90 DEGREES A SINGLE
DAY DURING AUGUST... AND GRAND RAPIDS ONLY ECLIPSED 90 ONCE... 92
DEGREES ON THE 27TH. LANSING AND MUSKEGON DID REACH THE UPPER 80S
DURING THE FINAL WEEK OF THE MONTH... WHICH SAW ABOVE NORMAL
TEMPERATURES RETURN TO WEST MICHIGAN.

AUGUST 2013 SAW BELOW NORMAL PRECIPITATION TO THE WEST OF U.S. 131
WITH HIGHER AMOUNTS TO THE EAST. GRAND RAPIDS... MUSKEGON AND
HOLLAND RECEIVED 1.50 INCHES TO 1.75 INCHES BELOW NORMAL
PRECIPITATION... WHILE LANSING... BATTLE CREEK AND JACKSON ALL
RECEIVED WELL ABOVE NORMAL PRECIPITATION. KALAMAZOO HAD SLIGHTLY
ABOVE NORMAL PRECIPITATION FOR THE MONTH. THE MAIN REASON FOR THIS
GEOGRAPHIC SPLIT IN MONTHLY RAINFALL IS A MESOSCALE CONVECTIVE
SYSTEM (MCS) THAT SWUNG OVER THE NORTHERN PERIPHERY OF A LARGE RIDGE
AND TRAVELED SOUTHEAST OVER LOWER MICHIGAN ON THE 27TH OF AUGUST.
THE LARGE COMPLEX DEVELOPED IN WISCONSIN AND DROPPED THE HEAVIEST
RAINFALL AMOUNTS IN A SWATH DOWN THROUGH THE CENTER OF LOWER
MICHIGAN... JUST EAST OF U.S. 131. LANSING ACTUALLY SET A DAILY
RAINFALL RECORD OF 3.39 INCHES ON AUGUST 27TH...BREAKING THE OLD
RECORD OF 1.50 INCHES SET IN 1869. MINOR FLOODING IN PARKING LOTS...
BASEMENTS AND STREETS AROUND LANSING... EAST LANSING AND MT.
PLEASANT WERE REPORTED.

SEVERE WEATHER STRUCK WITH THE MCS ON THE 27TH OF AUGUST. SOME OF
THE STRONGEST WINDS WERE REPORTED BETWEEN U.S. 10 AND M-20. GUSTS
BETWEEN 40-50 MPH WERE COMMON FROM LUDINGTON TO BIG RAPIDS. SOME
TREES WERE DOWNED AND SOME RESIDENTS WERE LEFT WITHOUT POWER.

EARLIER IN THE MONTH...SEVERE THUNDERSTORMS IMPACTED SOUTHWEST LOWER
MICHIGAN IN THE EARLY MORNING HOURS OF AUGUST 7TH. WINDS IN THE
60-70 MPH RANGE WERE COMMON ALONG THE LAKE MICHIGAN SHORELINE. A 70
MPH GUST WAS REPORTED IN MANISTEE AT 310 AM. NUMEROUS TREES DOWN AND
POWER OUTAGES WERE REPORTED IN IRONS. THE LAST OF THE DAMAGE WAS
DONE AROUND 4 AM WITH NUMEROUS TREES DOWN IN EVART.

$$

EBW










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