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

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CXUS53 KGRR 031139
CLMGRR

CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
747 AM EDT WED NOV 1 2017

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

...THE GRAND RAPIDS MI (ASOS) CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1892 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              89   10/01/1897
 LOW               18   10/30/1988
                        10/21/1974
HIGHEST            82   10/03        79       3       79  10/05
                        10/02
LOWEST             28   10/26        26       2       33  10/25
AVG. MAXIMUM     64.5              60.3     4.2     63.7
AVG. MINIMUM     45.9              41.8     4.1     45.6
MEAN             55.2              51.0     4.2     54.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      2               3.4    -1.4        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         8.32   1954
 MINIMUM         0.03   1952
TOTALS           9.69R             3.26    6.43     6.15
DAILY AVG.       0.31              0.11    0.20     0.20
DAYS >= .01        16              11.8     4.2       10
DAYS >= .10        10               6.8     3.2        6
DAYS >= .50         5               2.1     2.9        4
DAYS >= 1.00        4               0.6     3.4        3
GREATEST
 24 HR. TOTAL    2.81   10/23 TO 10/23

SNOWFALL (INCHES)
RECORDS
 TOTAL            8.4   1967
 24 HR TOTAL      8.4   10/26/1967 TO 10/27/1967
 SNOW DEPTH         5   10/27/1967
TOTALS            0.4               0.5    -0.1      0.0
SINCE 7/1         0.4               0.5    -0.1      0.0
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE       3               0.5     2.5        0
DAYS >= 1.0         0               0.2    -0.2        0
GREATEST
 SNOW DEPTH         0   MM                             0  MM
 24 HR TOTAL      0.4   10/31 TO 10/31

DEGREE_DAYS
HEATING TOTAL     308               440    -132      324
 SINCE 7/1        407               592    -185      368
COOLING TOTAL      11                 7       4       10
 SINCE 1/1        719               699      20      936

FREEZE DATES
RECORD
 EARLIEST     09/03/1946
 LATEST       06/04/1945
EARLIEST      10/26             10/13
LATEST                          05/02
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              9.9
RESULTANT WIND SPEED/DIRECTION   4/201
HIGHEST WIND SPEED/DIRECTION    31/280    DATE  10/30
HIGHEST GUST SPEED/DIRECTION    43/270    DATE  10/30

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   42
AVERAGE SKY COVER           0.70
NUMBER OF DAYS FAIR            3
NUMBER OF DAYS PC             15
NUMBER OF DAYS CLOUDY         13

AVERAGE RH (PERCENT)     76

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              4     MIXED PRECIP               2
HEAVY RAIN                9     RAIN                       8
LIGHT RAIN               21     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                1     SLEET                      2
FOG                      20     FOG W/VIS <= 1/4 MILE      0
HAZE                      2

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

&&

    OCTOBER 2017 WAS AN ACTIVE MONTH, PRODUCING NUMEROUS EVENTS FOR
DISCUSSION IN THE WEATHER COMMUNITY. OVERALL, THE MONTH AVERAGED
WARMER THAN NORMAL, MUCH WETTER THAN NORMAL AND DID SO IN THE
ABSENCE OF SEVERE THUNDERSTORMS.

    LAST MONTH WAS CHARACTERIZED BY PERSISTENTLY MILD CONDITIONS.
THE PERIOD STRETCHING FROM OCTOBER 2ND THROUGH OCTOBER 23RD
SUPPORTED A FAIRLY SOLID STRING OF ABOVE NORMAL TEMPERATURES. A
MAJORITY OF DAYS RANGED FROM 5-15 DEGREES ABOVE NORMAL WITH FEW DAYS
APPROACHING 20 DEGREES ABOVE NORMAL. GIVEN SEASONAL TRANSITION,
TEMPERATURE VARIABILITY WAS COMMON. HOWEVER, THE MAGNITUDE OF THE
WARMTH WAS SUCH THAT COOL DOWNS HAD LITTLE IMPACT ON ABOVE NORMAL
AVERAGES. MANY DAYS RECORDED HIGH TEMPERATURES IN THE 70S AND 80S.
IT WAS ALMOST RARE FOR DAYTIME TEMPERATURES TO FAIL TO REACH 60
DEGREES OR WARMER THROUGH THE FIRST 3 WEEKS. COOLER FALL
TEMPERATURES FINALLY SETTLED IN THROUGH THE LAST WEEK OF OCTOBER. IT
WAS THE ONLY STRETCH WHEN TEMPERATURES CONSISTENTLY AVERAGED NEAR OR
BELOW NORMAL. OCTOBER 26TH WAS THE FIRST DAY ALL CLIMATE SITES
DIPPED BELOW 30 DEGREES, RESULTING IN A HARD FREEZE AND WIDESPREAD
FROST.

      DESPITE NOT SETTING ANY RECORD HIGH TEMPERATURES, THE
PERSISTENT WARMTH AVERAGED INTO THE TOP-TEN AT MUSKEGON AND LANSING.
MUSKEGON RECORDED THEIR 9TH WARMEST OCTOBER ON RECORD, WHILE LANSING
ACHIEVED THEIR 10TH WARMEST OCTOBER ON RECORD.

      OCTOBER WAS ESSENTIALLY THE POLAR OPPOSITE OF SEPTEMBER. THE
FREQUENCY AND MAGNITUDE OF PRECIPITATION EVENTS CAN BE HIGHLIGHTED
AS SIGNIFICANT. ABOUT HALF THE MONTH RECORDED DAYS WITH MEASURABLE
PRECIPITATION. CONSIDERING TRACE AMOUNTS, EACH OF THE THREE CLIMATE
SITES RECORDED AROUND THREE WEEKS OF PRECIPITATION IN SOME FORM.
NEARLY ALL OF LOWER MICHIGAN ENDED THE MONTH WITH ABOVE NORMAL
RAINFALL. ON SEVERAL OCCASIONS, AT LEAST SOME PORTION OF SOUTHWEST
LOWER MICHIGAN WAS AFFECTED BY DAILY PRECIPITATION AMOUNT IN EXCESS
OF ONE INCH.

      TWO PERIODS OF RAINFALL STOOD OUT MOST IN OCTOBER. THE FIRST
OCCURRED WHEN SUB-SEVERE STORMS DUMPED HEAVY RAIN ON SOUTHWEST LOWER
MICHIGAN FROM OCTOBER 14TH INTO OCTOBER 15TH. MANY LOCATIONS FROM
ST. JOSEPH TO KALAMAZOO REPORTED 5-9 INCHES OF RAIN. THOUGH AMOUNTS
TAPERED TO THE NORTH, GRAND RAPIDS AND LANSING ACHIEVED DAILY
RAINFALL RECORDS ON OCTOBER 14TH.

      A SECOND EVENT SPANNED FROM OCTOBER 22ND THROUGH OCTOBER 24TH.
STEADY, LIGHT TO MODERATE RAIN FELL IN THE 48-72 HOUR PERIOD.
WIDESPREAD RAINFALL AMOUNTS OF 2-3 INCHES WERE OBSERVED WITH SOME
LOCATIONS PICKING UP OVER 4 INCHES. GRAND RAPIDS AND MUSKEGON SET
DAILY RAINFALL RECORDS ON OCTOBER 23RD. GRAND RAPIDS, LANSING AND
MUSKEGON SET NEW MONTHLY PRECIPITATION RECORDS, SURPASSING NORMAL
PRECIPITATION TOTALS BY MORE THAN 6 INCHES.

      AMONG OTHER HEADLINES WAS MINOR FLOODING IN RELATION TO HEAVY
RAIN EVENTS, A WATERSPOUT SIGHTED OFF THE LUDINGTON SHORELINE ON
OCTOBER 30TH AND SNOWFALL ON HALLOWEEN. ENOUGH SNOW ACCUMULATED AT
THE GRAND RAPIDS FORECAST OFFICE TO RANK AS THE SECOND SNOWIEST
HALLOWEEN ON RECORD. FOUR-TENTHS OF AN INCH FELL, WHICH MELTED
SHORTLY AFTER IT ACCUMULATED.

$$

JAM/MWS



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