MESOSCALE DISCUSSION 0423
NWS STORM PREDICTION CENTER NORMAN OK
0124 AM CDT FRI APR 10 2009
AREAS AFFECTED...FAR NORTHEAST LA AND NORTHERN/CENTRAL MS INTO
AL/MIDDLE TN
CONCERNING...TORNADO WATCH 127...
VALID 100624Z - 100800Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 127 CONTINUES.
TORNADO WATCH 127 CONTINUES UNTIL 10Z...WITH A RISK FOR ISOLATED
TORNADOES AND DAMAGING WINDS...ALONG WITH SEVERE HAIL. AN ADDITIONAL
WATCH MAY BE NEEDED WITHIN THE HOUR FOR THE REMAINDER OF NORTHERN MS
INTO THE ADJACENT PORTIONS OF AL.
A STRONG/SEVERE 100 MILE LONG MODESTLY BROKEN MCS WITH EMBEDDED
SUPERCELLS CONTINUES TO QUICKLY RACE EAST-NORTHEASTWARD TOWARD THE
I-55 CORRIDOR IN NORTHERN MS...WHILE A MORE ISOLATED SUPERCELL WITH
PRIOR TORNADIC HISTORY CONTINUES TO PROGRESS EASTWARD NEAR I-20 IN
NORTHEAST LA AS OF 0615Z. EVEN WITH A MARGINAL DOWNSTREAM
AIRMASS...EVOLVING BOW/LINEAR SYSTEM SHOULD CONTINUE TO
ORGANIZE/RACE NORTHEASTWARD WITH A DAMAGING WIND/SOME HAIL RISK
ACROSS NORTHEAST MS/NORTHWEST AL AND PERHAPS THE SOUTHERN PORTIONS
OF MIDDLE TN...ALTHOUGH THIS MCS MAY BECOME INCREASINGLY BASED ATOP
A COOL/MODESTLY MOIST BOUNDARY LAYER. THE PRIMARY TORNADO POTENTIAL
WILL LIKELY REMAIN WITH THE SOUTHERN PORTION OF THE EVOLVING LINE
AND/OR ANY QUASI-DISCRETE SUPERCELLS ACROSS FAR NORTHEAST LA INTO
NORTH CENTRAL MS...IN CLOSER PROXIMITY TO A SOMEWHAT RICHER LOW
LEVEL MOISTURE INFLUX /60S F SFC DEWPOINTS/ AMIDST STRENGTHENING
FLOW AROUND 1 KM/0-1 KM SRH.
..GUYER.. 04/10/2009
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