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MESOSCALE DISCUSSION 0266
NWS STORM PREDICTION CENTER NORMAN OK
0832 PM CDT WED MAR 25 2009
AREAS AFFECTED...LA AND CNTRL MS
CONCERNING...TORNADO WATCH 64...
VALID 260132Z - 260300Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 64 CONTINUES.
THE TORNADO...WIND DAMAGE AND HAIL THREAT SHOULD CONTINUE THROUGH
LATE THIS EVENING INTO THE OVERNIGHT PERIOD EWD ACROSS MUCH OF LA
AND CNTRL MS. A TORNADO WATCH WILL BE NEEDED EAST OF WW 63 BY 02Z TO
0230Z.
SFC ANALYSIS SHOWS A FRONTAL BOUNDARY MOVING SLOWLY NWD ACROSS THE
MCD AREA WITH LOWER TO MID 60S F DEWPOINTS SOUTH OF THE BOUNDARY.
THE MOIST AIRMASS IS CONTRIBUTING TO A MODERATELY UNSTABLE AIRMASS
AND THIS WILL FUEL A LARGE-SCALE BOW ECHO EWD INTO CNTRL MS BY
MIDNIGHT. STRENGTHENING LOW-LEVEL FLOW ALONG WITH INCREASING
LOW-LEVEL MOISTURE SHOULD MAKE WIND DAMAGE LIKELY WITH THE BOW. IN
ADDITION...SFC TEMPS HAVE DECREASED FROM INTERSTATE 20 SOUTH OVER
THE LAST FEW HOURS ALLOWING FOR LCL HEIGHTS TO DROP BELOW 500 METERS
AS INDICATED BY RUC ANALYSIS DATA. THIS COMBINED WITH STRONG
LOW-LEVEL SHEAR EVIDENT ON THE BRANDON MS WSR-88D VWP SUGGEST A
TORNADO THREAT WILL CONTINUE. ALTHOUGH TORNADOES WILL BE POSSIBLE
WITH EMBEDDED CELLS IN THE LINE ITSELF...SUPERCELLS AHEAD OF THE
LINE WILL ALSO HAVE A POTENTIAL FOR TORNADOES. AN ISOLATED STRONG
TORNADO REMAINS POSSIBLE ACROSS THE MCD AREA.
..BROYLES.. 03/26/2009
ATTN...WFO...MOB...JAN...LIX...LCH...SHV...
LAT...LON 30409337 30979360 31609347 31999301 32499168 32858983
32648905 32248886 31718883 31338920 31088998 30519227
30409337
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