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MESOSCALE DISCUSSION 0473
NWS STORM PREDICTION CENTER NORMAN OK
0655 PM CDT MON APR 13 2009
AREAS AFFECTED...PARTS OF SERN LA INTO CNTRL/SRN MS
CONCERNING...SEVERE THUNDERSTORM WATCH 152...
VALID 132355Z - 140130Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 152
CONTINUES.
CONTINUE REMAINING VALID PORTIONS OF WW UNTIL 01Z EXPIRATION. THE
NEED FOR AN ADDITIONAL WW IS NOT CURRENTLY ANTICIPATED FARTHER TO
THE EAST...BUT TRENDS WILL BE MONITORED.
INSTABILITY WITHIN A NARROW PRE-FRONTAL THERMAL RIDGE HAS PROVIDED
SUPPORT FOR SCATTERED VIGOROUS STORM DEVELOPMENT DURING THE PAST FEW
HOURS...DRIVEN BY LOW-LEVEL WARM ADVECTION AND THE INCREASING
INFLUENCE OF A SHORT WAVE TROUGH PIVOTING TOWARD THE LOWER
MISSISSIPPI VALLEY. AS THE BOUNDARY LAYER BEGINS TO COOL/STABILIZE
WITH THE LOSS OF DAYTIME HEATING BY THE 01-02Z TIME FRAME...AND
LATER BY THE PASSAGE OF THE COLD FRONT...STORM INTENSITY IS EXPECTED
TO GENERALLY DIMINISH. HOWEVER...IT IS STILL POSSIBLE THAT STORM
COVERAGE COULD INCREASE EAST OF MERIDIAN INTO THE BIRMINGHAM/SELMA
AND MONTGOMERY AREAS OF CENTRAL ALABAMA...IN RESPONSE TO STRONGER
LARGE-SCALE FORCING...THROUGH THE 02-04Z TIME FRAME.
..KERR.. 04/13/2009
ATTN...WFO...BMX...MOB...JAN...LIX...
LAT...LON 32048941 33248814 33698758 33868668 32888648 31978701
30538980 30849074 32048941
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