Climatological Report (Monthly)
Issued by NWS

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000
CXUS53 KGRR 011852
CLMBTL

CLIMATE REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
629 AM EDT SUN OCT 1 2017

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

...THE BATTLE CREEK MI CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1998 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
HIGHEST            94   09/23        MM      MM       88  09/07
                        09/22
LOWEST             41   09/10        MM      MM       49  09/27
                                                          09/03
AVG. MAXIMUM     78.7              73.4     5.3     75.8
AVG. MINIMUM     53.9              49.9     4.0     56.8
MEAN             66.3              61.6     4.7     66.3
DAYS MAX >= 90      6               0.2     5.8        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.5    -0.5        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
TOTALS             MM              3.65      MM       MM
DAILY AVG.         MM              0.12      MM     0.07
DAYS >= .01        MM              10.1      MM        8
DAYS >= .10        MM               6.1      MM        4
DAYS >= .50        MM               2.3      MM        1
DAYS >= 1.00       MM               1.0      MM        1
GREATEST
 24 HR. TOTAL      MM

DEGREE_DAYS
HEATING TOTAL      87               156     -69       43
 SINCE 7/1        107               197     -90       51
COOLING TOTAL     133                55      78       92
 SINCE 1/1        720               573     147      708
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              5.9
RESULTANT WIND SPEED/DIRECTION   1/212
HIGHEST WIND SPEED/DIRECTION    28/250    DATE  09/04
HIGHEST GUST SPEED/DIRECTION    34/250    DATE  09/04

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.20
NUMBER OF DAYS FAIR           19
NUMBER OF DAYS PC             10
NUMBER OF DAYS CLOUDY          1

AVERAGE RH (PERCENT)     69

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       5
LIGHT RAIN               11     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                0     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      1
HAZE                      2

-  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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