RSS FeedsIssued by NWS Detroit/Pontiac, MI
000
CXUS53 KDTX 012232
CLMDTW
CLIMATE REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
630 PM EDT FRI MAY 1 2009
...................................
...THE DETROIT CLIMATE SUMMARY FOR THE MONTH OF APRIL 2009...
CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1870 TO 2009
WEATHER OBSERVED NORMAL DEPART
VALUE DATE(S) VALUE FROM
NORMAL
................................................
TEMPERATURE (F)
RECORD
HIGH 89 04/12/1977
LOW 8 04/18/1875
HIGHEST 86 04/26 MM MM
04/24
LOWEST 29 04/12 MM MM
04/07
AVG. MAXIMUM 60.1 57.8 2.3
AVG. MINIMUM 39.4 38.4 1.0
MEAN 49.8 48.1 1.7
DAYS MAX >= 90 0 0.0 0.0
DAYS MAX <= 32 0 0.2 -0.2
DAYS MIN <= 32 7 8.7 -1.7
DAYS MIN <= 0 0 0.0 0.0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.05 1943
MINIMUM 0.43 1920
TOTALS 5.03R 3.05 1.98
DAILY AVG. 0.17 0.10 0.07
DAYS >= .01 12 MM MM
DAYS >= .10 9 MM MM
DAYS >= .50 3 MM MM
DAYS >= 1.00 1 MM MM
GREATEST
24 HR. TOTAL 1.54 04/19 TO 04/20
STORM TOTAL MM
(MM/DD(HH)) MM
SNOWFALL (INCHES)
RECORDS
MAXIMUM 25.7 1886
24 HR TOTAL T 04/13/2008 TO 04/13/2008
04/05/2006 TO 04/05/2006
TOTALS 7.4R 1.7 5.7
LIQUID EQUIV 0.74 0.20 0.54
SINCE 7/1 65.7 44.0 21.7
LIQUID 7/1 6.57
DAYS >= TRACE 6 2.1 3.9
DAYS >= 1.0 2 0.5 1.5
GREATEST
SNOW DEPTH 4R 04/06
24 HR TOTAL 5.2R MM
STORM TOTAL MM
(MM/DD(HH)) MM
DEGREE_DAYS
HEATING TOTAL 469 527 -58
SINCE 7/1 6163 6157 6
COOLING TOTAL 20 6 14
SINCE 1/1 20 6 14
FREEZE DATES
RECORD
EARLIEST MM
LATEST MM
EARLIEST MM
LATEST MM
.................................................
WIND (MPH)
AVERAGE WIND SPEED 11.0
HIGHEST WIND SPEED/DIRECTION 39/220 DATE 04/27
HIGHEST GUST SPEED/DIRECTION 48/220 DATE 04/27
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
NUMBER OF DAYS FAIR 6
NUMBER OF DAYS PC 7
NUMBER OF DAYS CLOUDY 17
AVERAGE RH (PERCENT) 60
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 8
LIGHT RAIN 13 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 1
LIGHT SNOW 3 SLEET 4
FOG 13 FOG W/VIS <= 1/4 MILE 1
HAZE 3
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
$$
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CLIMATOLOGICAL STATISTICS FOR THE NWS WHITE LAKE - APRIL 2009
...TEMPERATURE DATA... ...PRECIPITATION DATA...
AVERAGE MAXIMUM.... 57.2 MONTHLY TOTAL ........... 6.38
AVERAGE MINIMUM.... 36.3 GREATEST IN 24HRS........ 1.31
MONTHLY AVERAGE.... 46.8 ON THE 19-20TH
2009 TOTAL...............14.23
...HEATING DEGREE DAYS... ...SNOWFALL DATA...
MONTHLY TOTAL......... 566 MONTHLY TOTAL............ 9.2
2008-09 SEASON TOTAL..7094 2008-09 SEASON TOTAL..... 88.8
...COOLING DEGREE DAYS...
MONTHLY TOTAL.......... 12
2009 TOTAL............. 12
==================================================================
CLIMATOLOGICAL SUMMARY FOR DETROIT - APRIL 2009
...STORMY APRIL BRINGS HEAVY RAINS...SNOW...SEVERE WEATHER AND FLOODING...
...FREQUENT PRECIPITATION MAKES THIS APRIL THE 8TH WETTEST/6TH SNOWIEST...
...MINI HEATWAVE LATE ERASES BELOW NORMAL MONTHLY TEMPERATURE DEPARTURE...
...SNOWSTORM EARLY IN THE MONTH COMPLETES A SNOWY APRIL...
***DOMINANT TEMPERATURE/RAIN TREND...NEAR NORMAL/ABOVE NORMAL***
IT WAS YET ANOTHER BUSY MONTH ACROSS SOUTHEAST LOWER MICHIGAN WITH FREQUENT
EPISODES OF RAIN...SNOW AND OUR FIRST BRUSH WITH SEVERE WEATHER. RIGHT
OFF...IT RAINED OR SNOWED NEARLY EVERY DAY THE FIRST WEEK WITH THE MOST
EVENTFUL BEING THE SNOWSTORM ON THE 5-6TH. TEMPERATURES DROPPED WELL
BELOW NORMAL AFTER COLD AIR PUSHED THROUGH THE REGION ON THE 5TH INTO
THE 6TH THEN...HEAVY SNOW DEVELOPED NORTH OF A STORM CENTER AS IT
TRACKED THROUGH THE NORTHERN OHIO VALLEY. ONLY THE FAR SOUTHEAST CORNER
ESCAPED THE HEAVY SNOW. THE AREA FROM ANN ARBOR...EAST THROUGH DETROIT
AND NORTH UP INTO THE NORTHERN SUBURBS WHERE MAINLY 4.0" TO 7.0" FELL.
HERE AT THE NWS IN WHITE LAKE...THE MOST SNOW WAS MEASURED WITH 7.8".
THIS STORM PUSHED SNOWFALL TOTALS UP ACROSS THE BOARD FOR THE MONTH AND
SEASON (MORE ON THE SEASON SNOWFALL AND UPDATED WINTER REVIEW IN EARLY
MAY). THE STORM MADE IT THE SIXTH SNOWIEST APRIL FOR DETROIT WITH 7.4"
OF SNOW.
THE BELOW NORMAL TEMPERATURES PERSISTED INTO MID MONTH WHEN A STRONG
WARM UP PUSHED READINGS UP INTO THE 70S. ONE OF THE BEST DAYS OF THE
MONTH (AND SPRING) CAME ON THE 18TH...A SATURDAY WITH SUNNY SKIES...
LOW HUMIDITIES AND TEMPERATURES IN THE MID 70S...REMINISCENT OF ST
PATRICK`S DAY. IT DID NOT LAST...HOWEVER...AS A STRONG STORM CENTER
BROUGHT ANOTHER ROUND OF HEAVY RAIN ACROSS THE REGION FROM THE 19TH TO
20TH WHEN AN INCH AND HALF FELL AT DETROIT METRO AIRPORT. THE HEAVIEST
RAIN FELL FROM THE METRO AREA SOUTH TO THE OHIO BORDER.
A PATTERN REVERSAL CAME LATE IN THE MONTH WITH AN UPPER LEVEL RIDGE OF
HIGH PRESSURE BRINGING A STRONG WARMING TREND ACROSS THE EASTERN HALF OF
THE COUNTY. TEMPERATURES ROSE WELL UP INTO THE 80S ACROSS EXTREME
SOUTHEAST MICHIGAN. THE ADVANCEMENT OF THE SUMMER-LIKE AIR WAS
CHALLENGED FURTHER NORTH ACROSS THE SAGINAW VALLEY AND THUMB REGION
WHERE COOL NORTHEAST WINDS BUCKED THE WARMTH. RECORD HIGH TEMPERATURES
WERE TIED THREE OUT OF FOUR DAYS AT DETROIT FROM THE 24TH THROUGH THE
27TH. FIRST ON THE 24TH...THE HIGH TEMPERATURE OF 86 DEGREES TIED THE
OLD RECORD OF 86 SET FIRST IN 1960. ON SATURDAY WHEN THE HIGH REACHED
84...THE HIGH FELL THREE DEGREES SHY OF THE OLD RECORD OF 87. A HIGH OF
86 ON SUNDAY (4/26) TIED THE OLD RECORD OF 86 SET FIRST IN 1915. THEN
FINALLY ON THE 27TH...A HIGH OF 84 WAS ATTAINED AND ONCE AGAIN THE OLD
RECORD WAS TIED. INTERESTINGLY..THE OLD RECORD(S) OF 84 WAS SET AN
IMPRESSIVE THREE TIMES...FIRST IN 1938...1962 AND 1990.
THE BIGGEST WEATHER MAKER OF THE MONTH CAME IN THE FORM OF A POTENT
SEVERE WEATHER OUTBREAK DURING THE MINI-HEATWAVE ON THE 25TH. SEVERE
THUNDERSTORMS ORGANIZED IN LINES AND SURGED ACROSS SOUTHEAST MICHIGAN
SATURDAY AFTERNOON. FOR THE FIRST OUTBREAK OF THE SEASON...THESE LINES
OF STORMS HAD A STRONG PUNCH. THIS WAS ALMOST EXCLUSIVELY A WIND EVENT
WITH NUMEROUS REPORTS OF 50 TO 70 MPH WIND GUSTS. STRONGEST STORMS
MOVED ACROSS CENTRAL AND NORTHERN OAKLAND...MACOMB AND ST CLAIR
COUNTIES. SOME OF THE SAME AREAS HIT WITH LAST JUNE 8TH`S DERECHO WAS
UNDER THE GUN THIS TIME TOO. THE STORMS ALSO BROUGHT HEAVY DRIVING
RAINS WHICH ONLY AGGRAVATED SOME OF THE ALREADY HIGH RIVERS AND
LOWLANDS WITH MORE FLOODING. THE MAIN FLOODING OCCURRED AGAIN ON THE
HURON RIVER NEAR HAMBURG OVER EXTREME SOUTHEAST MICHIGAN (MORE FLOODING
WAS NOTED ACROSS THE FLINT AREA INTO THE SAGINAW VALLEY AND THUMB
REGION).
ANOTHER GOOD DOSE OF RAIN AT MONTH`S END BROUGHT UP TO AN INCH AT
SOME LOCATIONS AND MADE IT THE SIXTH WETTEST APRIL (1999 WAS THE LAST
TIME IT WAS THIS WET /5.13/). ON THE SNOW SIDE OF THINGS...THE 7.4" OF
SNOW MADE IT THE 6TH SNOWIEST APRIL (1982 WAS THE LAST TIME MORE SNOW
FELL /8.0"/.
THOUGH APRIL AVERAGED ABOVE NORMAL IN THE TEMPERATURE AND PRECIPITATION
DEPARTMENT...THE MONTH HAD JUST ABOUT AS MANY BELOW NORMAL DAYS AS
ABOVE. OUR FOUR DAY "HOT" STREAK AVERAGED 15 TO 20 DEGREES ABOVE NORMAL.
BEFORE THAT...THE MONTHLY TEMPERATURE AVERAGED ABOUT A DEGREE AND HALF
BELOW.
DEEDLER
