223
CXUS53 KGRR 011950
CLMGRR
CLIMATE REPORT...ADDED SUMMARY PARAGRAPHS
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
250 PM EST SUN NOV 1 2009
...............................
...THE GRAND RAPIDS MI CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2009...
CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1892 TO 2009
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 68 10/21 79 -11 82 10/12
LOWEST 27 10/18 26 1 27 10/30
AVG. MAXIMUM 55.6 59.6 -4.0 59.7
AVG. MINIMUM 40.9 40.2 0.7 40.0
MEAN 48.3 49.9 -1.6 49.9
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 4 5.7 -1.7 5
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.32 1954
MINIMUM 0.03 1952
TOTALS 7.64 2.80 4.84 2.71
DAILY AVG. 0.25 0.09 0.16 0.09
DAYS >= .01 16 11.3 4.7 12
DAYS >= .10 11 5.9 5.1 8
DAYS >= .50 4 1.9 2.1 2
DAYS >= 1.00 2 0.5 1.5 0
GREATEST
24 HR. TOTAL 2.83 10/30 TO 10/30
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 T 0.6 -0.6 T
LIQUID EQUIV MM 0.10 MM MM
SINCE 7/1 T 0.6 -0.6 T
LIQUID 7/1 MM 0.10 MM MM
SNOWDEPTH AVG. 0 0 0 0
DAYS >= TRACE 1 0.6 0.4 1
DAYS >= 1.0 0 0.2 -0.2 0
GREATEST
SNOW DEPTH 0 MM 0 MM
24 HR TOTAL T 10/06 TO 10/06
DEGREE_DAYS
HEATING TOTAL 513 471 42 468
SINCE 7/1 646 664 -18 534
COOLING TOTAL 0 5 -5 5
SINCE 1/1 455 613 -158 635
FREEZE DATES
RECORD
EARLIEST 09/03/1946
LATEST 06/04/1945
EARLIEST 10/13
LATEST 05/02
.............................................................
WIND (MPH)
AVERAGE WIND SPEED 8.7
RESULTANT WIND SPEED/DIRECTION 2/202
HIGHEST WIND SPEED/DIRECTION 38/280 DATE 10/07
HIGHEST GUST SPEED/DIRECTION 51/260 DATE 10/07
SKY COVER
POSSIBLE SUNSHINE (PERCENT) 22
NUMBER OF DAYS FAIR 0
NUMBER OF DAYS PC 9
NUMBER OF DAYS CLOUDY 22
AVERAGE RH (PERCENT) 73
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 0 MIXED PRECIP 0
HEAVY RAIN 5 RAIN 10
LIGHT RAIN 23 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 1
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 22 FOG W/VIS <= 1/4 MILE 2
HAZE 8
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
OCTOBER 2009 WAS SIGNIFICANTLY COLDER THAN NORMAL...WETTER THAN
NORMAL AND MUCH CLOUDIER THAN NORMAL. IT IS THE THIRD MONTH THIS
YEAR TO BE IN THE TOP ONE THIRD COLDEST MONTHS...WITH JANUARY AND
JULY. MOST OF THE AREA INLAND OF ROUTE 31 AND NORTH OF INTERSTATE 94
HAD A HARD FREEZE ON THE MORNING OF THE 1ST. THOSE WHO DID NOT HAVE
A HARD FREEZE ON THE 1ST HAD IT ON THE 10TH. IT IS THE FOURTH MONTH
THIS YEAR TO BE IN THE TOP ONE THIRD WETTEST...WITH APRIL...JUNE AND
AUGUST BEING THE OTHER WET MONTHS. THIS IS THE FIRST OCTOBER ON
RECORD WITH GRAND RAPIDS NOT MAKING 70 DEGREES AT ANY TIME IN THE
MONTH.
TEMPERATURES WHERE BELOW NORMAL FOR THE FIRST EIGHTEEN DAYS OF
OCTOBER...THEN A WARM FRONT CAME THROUGH DURING THE MORNING OF THE
19TH AND FROM THAT POINT THROUGH THE 30TH...TEMPERATURES WERE ABOVE
NORMAL EXCEPT FOR ONE BELOW NORMAL DAY ON THE 24TH.
A DEEP STORM SYSTEM OVER EASTERN KANSAS EARLY IN THE MORNING OF THE
1ST MOVED NORTH TO MINNESOTA BY THE MORNING OF THE 2ND...THEN
STALLED OVER THE WESTERN GREAT LAKES INTO THE 4TH BEFORE MOVING OUT
OF THE AREA ON THE 5TH. THIS BROUGHT ONE TO TWO INCHES OF RAIN OVER
THE SOUTHWESTERN SECTIONS OF THE STATE AND FROM A HALF TO ONE INCH
OVER THE REMAINDER OF SOUTHWEST LOWER MICHIGAN.
THE NEXT DEEP STORM DEVELOPED OVER EASTERN COLORADO ON THE 5TH THEN
MOVED EAST NORTHEAST AND OCCLUDED AS THE CENTER OF THE STORM MOVED
OVER NORTHERN LAKE MICHIGAN BY THE EVENING OF THE 6TH. THAT BROUGHT
BETWEEN A HALF INCH AND AN INCH OF RAIN TO THE AREA. THE HEAVIEST
RAINFALL WITH THIS EVENT WAS NORTH OF ROUTE 10 AND WEST OF HIGHWAY
131.
A STRONG COLD FRONT MOVED THROUGH THE AREA ON THE 9TH. THAT BROUGHT
AROUND A QUARTER INCH OF RAIN OVER NORTHERN SECTIONS OF THE COUNTY
WARNING AREA... TO AROUND A HALF INCH IN THE INTERSTATE 96 REGION TO
AROUND THREE QUARTERS OF AN INCH NEAR INTERSTATE 94.
MUCH COLDER AIR MOVED INTO THE AREA BEHIND THAT FRONT AND REMAINED
IN PLACE THROUGH THE 18TH. FROM THE 10TH THROUGH THE 18TH A LARGE
CANADIAN HIGH BROUGHT MOSTLY COLDER THAN NORMAL TEMPERATURES TO THE
AREA. TEMPERATURES AVERAGED FROM 10 TO 12 DEGREES BELOW NORMAL
ACROSS THE AREA DURING THAT TIME. THE COLDEST DEPARTURES FROM NORMAL
WERE OVER THE SOUTHWEST QUARTER OF SOUTHWEST LOWER MICHIGAN. A FEW
WEAK COLD FRONTS MOVED THROUGH THE AREA DURING THAT TIME BUT VERY
LITTLE IN THE WAY OF RAINFALL OCCURRED.
THE WARM FRONT MOVED THOUGHT THE AREA ON THE 19TH DURING THE
MORNING BUT IT DID NOT BRING ANY SIGNIFICANT PRECIPITATION WITH IT.
A COLD FRONT MOVED INTO THE REGION ON THE 20TH...THEN STALLED OVER
THE SOUTHERN PART OF LOWER MICHIGAN. THAT ALLOWED A DEVELOPING STORM
SYSTEM FROM SOUTHWEST KANSAS TO TRACK ALONG THE FRONT THROUGH
SOUTHERN IOWA AND NORTHERN MISSOURI ON THE 22ND...WHERE IT DEEPENED
CONSIDERABLY. THE SURFACE CENTER OF THE STORM THEN TRACKED NORTH
NORTHEAST FROM CHICAGO TO NEAR TRAVERSE CITY ON THE 23TH. THIS STORM
BROUGHT A CONSIDERABLE AMOUNT OF WIND AND RAIN TO THE AREA.
LOCATIONS ALONG THE LAKE MICHIGAN SHORE REPORTED WIND GUSTS TO
BETWEEN 45 AND 50 MPH DURING THE AFTERNOON ON THE 23RD. RAINFALL OF
BETWEEN ONE AND THREE INCHES OCCURRED BETWEEN THE EVENING OF THE
22ND AND MORNING OF THE 24TH. THERE WERE NUMEROUS REPORTS OF
LOCALIZED FLOODING NEAR AND WEST OF ROUTE 131 FROM THIS EVENT. THE
HEAVIEST RAINFALL OCCURRED IN THIS AREA.
A WEAK COLD FRONT IN COMBINATION WITH A SOUTHERN STREAM MOISTURE
FEED BROUGHT FROM ONE HALF TO ONE INCH OF RAIN ALONG THE LAKE
MICHIGAN SHORE FROM THE 25TH INTO THE 26TH.
FINALLY...A VERY STRONG FALL STORM THAT TRACKED FROM THE SOUTHERN
PLAINS TO THE CANADIAN BORDER WAS OUR LAST STORM OF THE MONTH
AND IT FEATURED STRONG WINDS AND HEAVY RAINFALL. MANY LOCATIONS
ACROSS WESTERN LOWER MICHIGAN AND SOUTHWESTERN LOWER MICHIGAN
RECEIVED BETWEEN 1 TO 3 INCHES OF RAIN...WITH A FEW HIGHER AMOUNTS.
WINDS GUSTED BETWEEN 40 AND 50 MPH IN NUMEROUS LOCATIONS.
WDM HOVING
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