RSS FeedsIssued by NWS Grand Rapids, MI
000
CXUS53 KGRR 011622 CCA
CLMGRR
CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE GRAND RAPIDS, MI
1208 PM EDT THU OCT 1 2009
...................................
...THE GRAND RAPIDS MI CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 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 98 09/02/1913
09/16/1899
LOW 27 09/28/1991
HIGHEST 84 09/14 87 -3 92 09/02
LOWEST 41 09/30 35 6 44 09/16
AVG. MAXIMUM 74.2 71.7 2.5 74.5
AVG. MINIMUM 53.0 51.0 2.0 54.9
MEAN 63.6 61.3 2.3 64.7
DAYS MAX >= 90 0 0.4 -0.4 1
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.4 -0.4 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 11.85 1986
MINIMUM 0.00 1979
TOTALS 1.56 4.28 -2.72 9.54
DAILY AVG. 0.05 0.14 -0.09 0.32
DAYS >= .01 7 10.5 -3.5 11
DAYS >= .10 4 6.9 -2.9 8
DAYS >= .50 1 2.8 -1.8 5
DAYS >= 1.00 0 1.1 -1.1 3
GREATEST
24 HR. TOTAL 0.83 09/27 TO 09/28
SNOWFALL (INCHES)
RECORDS
TOTAL T 2003
24 HR TOTAL T MM
SNOW DEPTH T MM
TOTALS 0.0 0.0 0.0 0.0
LIQUID EQUIV 0.00 0.00 0.00 0.00
SINCE 7/1 0.0 0.0 0.0 0.0
LIQUID 7/1 0.00 0.00 0.00 0.00
SNOWDEPTH AVG. 0 0 0 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 MM
DEGREE_DAYS
HEATING TOTAL 80 159 -79 62
SINCE 7/1 133 193 -60 66
COOLING TOTAL 47 56 -9 61
SINCE 1/1 455 608 -153 630
FREEZE DATES
RECORD
EARLIEST 09/03/1946
LATEST 06/04/1945
EARLIEST 10/13
LATEST 05/02
.................................................................
WIND (MPH)
AVERAGE WIND SPEED 5.8
RESULTANT WIND SPEED/DIRECTION 1/062
HIGHEST WIND SPEED/DIRECTION 31/280 DATE 09/28
HIGHEST GUST SPEED/DIRECTION 41/260 DATE 09/28
SKY COVER
POSSIBLE SUNSHINE (PERCENT) 64
NUMBER OF DAYS FAIR 13
NUMBER OF DAYS PC 11
NUMBER OF DAYS CLOUDY 6
AVERAGE RH (PERCENT) 70
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 3 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 3
LIGHT RAIN 10 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 22 FOG W/VIS <= 1/4 MILE 4
HAZE 17
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
&&
SEPTEMBER 2009 WAS GENERALLY QUIET THROUGH THE FIRST TWO THIRDS OF
THE MONTH AND USHERED IN FALL/LIKE WEATHER AS IT ENDED.
THE MONTH STARTED OUT ON THE COOL SIDE... AS A COLD FRONT MOVED
THROUGH THE AREA AND HIGH PRESSURE BUILT IN. TEMPERATURES WARMED TO
ABOVE NORMAL VALUES THROUGH MUCH OF THE REST OF THE MONTH.
A LOW PRESSURE SYSTEM MOVED TO THE SOUTH OF THE AREA ON THE 7TH AND
BROUGHT SOME LIGHT RAIN THROUGH THE 9TH. A FEW WEAK... DRY FRONTS
PASSED THROUGH THE REGION DURING THE NEXT WEEK WITH HIGH PRESSURE
GENERALLY OVER THE REGION.
A SHIFT IN THE STORM PATTERN THEN BEGAN TO EMERGE. A STRONG LOW
PRESSURE SYSTEM FROM THE FRONT RANGE MOVED TO AND OVER MICHIGAN.
STRONG MOIST FLOW FROM THE GULF OF MEXICO PRECEDED THE SYSTEM. A
CANADIAN LOW THEN MOVED IN... BRINGING A STRONG COLD FRONT AND THE
ONLY SEVERE WEATHER FOR THE MONTH. THIS MAINLY OCCURED IN MONTCALM
COUNTY DUE TO STRAIGHT LINE WINDS. PRECIPITATION OCCURED MOST DAYS
FROM THE 20TH THROUGH THE 29TH WITH THIS SHIFT. TEMPERATURES PLUNGED
TO BELOW NORMAL FROM THE 28TH ON.
$$
IOD
