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

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000
CXUS53 KGRR 011846
CLMGRR

RECORDS
 TOTAL              T   2003
 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   09/30 TO 09/30

DEGREE_DAYS
HEATING TOTAL      83               132     -49       44
 SINCE 7/1         99               152     -53       44
COOLING TOTAL     136                67      69       95
 SINCE 1/1        708               692      16      926

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

WIND (MPH)
AVERAGE WIND SPEED              6.6
RESULTANT WIND SPEED/DIRECTION   1/196
HIGHEST WIND SPEED/DIRECTION    31/240    DATE  09/04
HIGHEST GUST SPEED/DIRECTION    40/240    DATE  09/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   77
AVERAGE SKY COVER           0.40
NUMBER OF DAYS FAIR           10
NUMBER OF DAYS PC             18
NUMBER OF DAYS CLOUDY          2

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              1     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       1
LIGHT RAIN                7     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      15     FOG W/VIS <= 1/4 MILE      2
HAZE                      1

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

$$

JAM
WRKCLMGRR 000
TTAA00 KGRR 030024


CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
818 PM EDT SAT SEP 2 2017

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

...THE GRAND RAPIDS MI (ASOS) CLIMATE SUMMARY FOR THE SEASON, FROM
6/1/2017 TO 8/31/2017...

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             108   07/13/1936
 LOW               32   06/04/1945
HIGHEST            93   06/12        93       0       93  06/18
LOWEST             46   06/02        41       5       45  06/09
AVG. MAXIMUM     80.8              80.8     0.0     83.5
AVG. MINIMUM     59.7              60.3    -0.6     61.9
MEAN             70.2              70.6    -0.4     72.7
DAYS MAX >= 90      5               7.8    -2.8       18
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        22.63   1994
 MINIMUM         3.18   1918
TOTALS           7.72             11.14   -3.42    14.74
DAILY AVG.       0.09              0.12   -0.03     0.16
DAYS >= .01        31              29.4     1.6       31
DAYS >= .10        20              18.2     1.8       20
DAYS >= .50         4               7.6    -3.6       10
DAYS >= 1.00        1               3.0    -2.0        5
GREATEST
 24 HR. TOTAL    1.68   06/17 TO 06/17

SNOWFALL (INCHES)
RECORDS
 TOTAL            0.0   MM
 24 HR TOTAL      0.0   MM
 SNOW DEPTH         0   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   MM

DEGREE_DAYS
HEATING TOTAL      38                65     -27       21
 SINCE 7/1         16                20      -4        0
COOLING TOTAL     542               578     -36      760
 SINCE 1/1        572               625     -53      831

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

WIND (MPH)
AVERAGE WIND SPEED              8.1
RESULTANT WIND SPEED/DIRECTION   3/245
HIGHEST WIND SPEED/DIRECTION    43/330    DATE  07/07
HIGHEST GUST SPEED/DIRECTION    58/330    DATE  07/07

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   68
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           16
NUMBER OF DAYS PC             64
NUMBER OF DAYS CLOUDY         12

AVERAGE RH (PERCENT)     71

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             19     MIXED PRECIP               0
HEAVY RAIN               11     RAIN                      15
LIGHT RAIN               40     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      41     FOG W/VIS <= 1/4 MILE      5
HAZE                      6

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

&&

IN THE GRAND SCHEME, SEPTEMBER 2017 AVERAGED WARMER AND DRIER THAN
NORMAL. TEMPERATURES VARIED QUITE CONSIDERABLY FROM WEEK TO WEEK.
PRECIPITATION LARGELY CONSISTED OF A LIGHTER VARIETY OF EVENTS.
HEAVY RAIN WAS LOCALIZED WITH LIMITED AERIAL COVERAGE.

LARGE TEMPERATURE SWINGS WERE COMMON THROUGH THE MONTH. TRANSITIONS
WERE SOMEWHAT GRADUAL, THOUGH, OCCURRING OVER A PERIOD OF A COUPLE
OF DAYS. THE MONTH STARTED ABOUT 10 DEGREES BELOW NORMAL. HOWEVER,
REMNANTS OF HURRICANE HARVEY TRAVELED THROUGH THE OHIO VALLEY,
BROUGHT MILDER AIR NORTHWARD AND RESULTED IN TEMPERATURES THAT WERE
CLOSER TO NORMAL FOR A BRIEF TIME. BEHIND THE SYSTEM, AN UPPER LEVEL
TROUGH DUG SOUTHWARD FROM CANADA. TEMPERATURES SETTLED BACK BELOW
NORMAL FROM THE 5TH THROUGH THE 11TH WITH DAYTIME HIGHS AS MUCH AS
15 DEGREES BELOW AVERAGES.

THE TRANSITION TO WARMER TEMPERATURES BEGAN AROUND MID-MONTH. AN
UPPER RIDGE DEVELOPED, AS HIGH PRESSURE STRENGTHENED AND CENTERED
OVER THE GREAT LAKES. IT REMAINED ABOVE NORMAL FOR MUCH OF THE
SECOND HALF OF THE MONTH. NO SINGLE CALENDAR DAY AVERAGED BELOW
NORMAL FROM THE 13TH THROUGH THE 29TH AT EACH OF THE THREE MAIN
CLIMATE SITES (GRAND RAPIDS, LANSING AND MUSKEGON). SOME DAYS
AVERAGED MORE THAN 20 DEGREES ABOVE NORMAL.

MANY RECORD HIGH TEMPERATURES WERE EITHER BROKEN OR TIED OVER A
PERIOD OF SIX CONSECUTIVE DAYS, WHICH SPANNED SEPTEMBER 21ST THROUGH
SEPTEMBER 26TH. GRAND RAPIDS AND LANSING MADE IT INTO THE 90S EACH
OF THE SIX DAYS, INCLUDING A HIGH TEMPERATURE OF 96 DEGREES IN GRAND
RAPIDS ON SEPTEMBER 23RD. AMONG THE RECORDS WERE THE OCCASIONAL
RECORD WARM LOWS, AS NIGHTTIME TEMPERATURES RANGED FROM THE MID-60S
TO AROUND 70 DEGREES. ALL THREE CLIMATE SITE`S MONTHLY TEMPERATURE
AVERAGES RANKED IN THE TOP TEN OF WARMEST SEPTEMBERS.

FEW DAYS IN SEPTEMBER INCLUDED MEASURABLE RAINFALL, WHICH EVENTUALLY
ACHIEVED MARGINAL DROUGHT STATUS (D1) IN SECTIONS OF SOUTHERN LOWER
MICHIGAN. GRAND RAPIDS AND LANSING EACH RECORDED ONLY ONE DAY WITH
MORE THAN ONE-QUARTER OF AN INCH OF PRECIPITATION, WHILE MUSKEGON
RECORDED TWO DAYS WITH SIMILAR AMOUNTS. NO CALENDAR DAY IN EACH CASE
EXCEEDED HALF AN INCH. THE ONLY EXCEPTION TO THE ABNORMALL DRY
STREAK WAS ON SEPTEMBER 21ST, WHEN NEARLY STATIONARY THUNDERSTORMS
AFFECTED SOUTH-CENTRAL LOWER MICHIGAN. LOCALIZED RAINFALL AMOUNTS OF
1-3 INCHES FELL WITH ONE REPORT OF 3.49 INCHES NEAR RICHLAND, MI. IT
WAS AMONG THE FIVE DRIEST SEPTEMBERS FOR MUSKEGON AND GRAND RAPIDS.
LANSING ONLY RANKED 15TH DRIEST, DUE TO LOCALIZED THUNDERSTORMS ON
THE 21ST.

THUNDERSTORMS WERE TAME THROUGHOUT THE MONTH. OCCASIONAL REPORTS OF
SMALL HAIL WERE RECEIVED WITH ISOLATED WIND GUSTS OF 40-50 MPH. THE
MOST NOTABLE PHENOMENON WERE WATERSPOUTS THAT DEVELOPED OVER LAKE
MICHIGAN ON THE 5TH AND 9TH.

$$

JAM



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