April 2007 Climate Summary

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
405 PM CDT MON MAY 14 2007

OKZ004>048-050>052-TXZ083>090-151200-
405 PM CDT MON MAY 14 2007

…APRIL 2007 MONTHLY SUMMARY…
DID MARCH AND APRIL SWITCH PLACES THIS YEAR? COOL TEMPERATURES AND
NEAR NORMAL RAINFALL WERE THE RULE AT BOTH OKLAHOMA CITY AND WICHITA
FALLS.

FOR OKLAHOMA CITY:

AFTER AN UNSEASONABLY WARM MARCH… APRIL TONED IT DOWN A BIT…
WITH THE AVERAGE TEMPERATURE COMING IN SEVERAL DEGREES BELOW NORMAL.
THE UNUSUALLY WARM MARCH GAVE PEOPLE A FALSE HOPE… WITH MANY
PLANTING GARDENS AND OTHER OUTDOOR PLANTS DURING THE MONTH.
HOWEVER… A COUPLE OF ARCTIC COLD FRONTS MOVED THROUGH OKLAHOMA
CITY DURING THE EARLY AND MIDDLE PARTS OF THE MONTH. ALTHOUGH
TECHNICALLY WILL ROGERS WORLD AIRPORT DID NOT FALL BELOW FREEZING…
THE LOWEST TEMPERATURE WAS 33 DEGREES… MOST OF THE SURROUNDING
AREAS FELL SEVERAL DEGREES BELOW FREEZING. OKLAHOMA CITY WAS
KNOCKING ON THE DOOR OF THE TOP TEN COOLEST APRIL MONTHS… UNTIL
THE LAST SEVERAL DAYS OF THE MONTH WITH ABOVE NORMAL TEMPERATURES.
THE AVERAGE TEMPERATURE FOR THE MONTH WAS 67.6 DEGREES… FALLING
3.6 DEGREES BELOW NORMAL. THE AVERAGE FOR THE MONTH WILL GO DOWN AS
THE 20TH COOLEST APRIL MONTH ON RECORD. WHAT MAKES THE AVERAGE
TEMPERATURE SO UNIQUE IS NOT SO MUCH THAT IS WAS WELL BELOW
NORMAL… BUT THAT IT WAS 2.8 DEGREES BELOW THE AVERAGE TEMPERATURE
IN MARCH. THIS HAS ONLY HAPPENED ON ONE OTHER OCCASION… OCCURRING
IN 1907. BELOW IS A TABLE WITH THE AVERAGE TEMPERATURES FOR MARCH IN
APRIL OF 1907 AND 2007. THE COOLEST TEMPERATURE OF 33 DEGREES
OCCURRED ON THE 7TH. THE COOLEST HIGH TEMPERATURE WAS 41 DEGREES…
WHICH BROKE A RECORD FOR THE COOLEST HIGH TEMPERATURE ON THIS DATE.

AVERAGE TEMPERATURES
YEAR MARCH APRIL
1907 59.6 54.4
2007 60.2 57.4

ALTHOUGH THERE WERE SEVERAL DAYS OF THE MONTH WITH PRECIPITATION…
THE TOTAL PRECIPITATION OF 2.57 INCHES WAS 0.43 INCHES BELOW NORMAL.
NORMALLY THIS WOULD BE A SLIGHT CAUSE FOR CONCERN… BUT THE EXCESS
FOR THE YEAR IS STILL 4.55 INCHES. MANY AREAS AROUND THE STATE
RECEIVED BENEFICIAL RAINFALL THROUGHOUT THE MONTH… MANY OF THEM
REPORTING ABOVE NORMAL PRECIPITATION FOR APRIL. ALSO… BECAUSE OF
THE COOLER AIR THAT WAS IN PLACE DURING THE FIRST HALF OF THE
MONTH… SNOW WAS ACTUALLY REPORTED ON TWO SEPARATE OCCASIONS. THERE
WERE NO ACCUMULATIONS IN THE OKLAHOMA CITY AREA DUE TO WARM GROUND
TEMPERATURES… BUT SNOW DID FALL HARD ENOUGH TO REDUCE VISIBILITIES
FOR A BRIEF TIME. SNOWFALL IN APRIL IS NOT UNHEARD OF… IN FACT IT
HAS OCCURRED ON SEVERAL OCCASIONS. BUT GIVEN WE HAD A VERY WARM
MARCH WITH NO SNOWFALL… IT WAS A REAL SLAP IN THE FACE THAT WINTER
WAS NOT READY TO RELEASE HER GRIP JUST YET.

THE TOTAL PRECIPITATION FOR THE YEAR IS NOW 13.29 INCHES. COMPARE
THIS TO THE 6.31 INCHES THAT JANUARY THROUGH APRIL 2006 RECEIVED.
OKLAHOMA DID NOT RECEIVE THAT MUCH PRECIPITATION LAST YEAR UNTIL
JULY. ANNUAL PRECIPITATION TOTALS THIS YEAR HAVE GONE A LONG WAY TO
ELIMINATING… OR SIGNIFICANTLY DENTING THE DROUGHT THAT HAS PLAGUED
THE REGION OVER THE LAST COUPLE OF YEARS.

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About Putnam Reiter

Putnam has been storm chasing since 1990 and is a co-founder of Hook-Echo.com. For his day job, Putnam works in emergency management for information technology.
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