DAY48SVR: Nws Storm Prediction Center Norman Ok

ACUS48 KWNS 150829
SWOD48
SPC AC 150828

DAY 4-8 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0328 AM CDT MON APR 15 2013

VALID 181200Z - 231200Z

...DISCUSSION...
...LOWER/MID MS VALLEY...

MEDIUM RANGE GUIDANCE IS REASONABLY CONSISTENT REGARDING THE
PROGRESSIVE NATURE OF UPPER TROUGH AND A VERY STRONG MID LEVEL SPEED
MAX OVER MO THURSDAY AFTERNOON. ASSOCIATED COLD FRONT IS EXPECTED
TO BE THE PRIMARY INSTIGATOR IN STRONG/SEVERE DEEP CONVECTION DURING
THE DAY4 PERIOD WITH ORGANIZED SEVERE POSSIBLY ONGOING AT THE
BEGINNING OF THE PERIOD. GIVEN THAT MORE MEANINGFUL LAPSE RATES
WILL BE OVERTURNED ACROSS THE SRN PLAINS WEDNESDAY THERE IS REASON
TO BELIEVE A NARROW CORRIDOR OF MODEST INSTABILITY WILL EXTEND FROM
THE LOWER SABINE RIVER VALLEY OF LA...NNEWD INTO THE MID MS VALLEY
WHERE LOW LEVEL CONVERGENCE SHOULD BE MAXIMIZED AHEAD OF STRONG MID
LEVEL SPEED MAX. AN ELONGATED SQUALL LINE WILL LIKELY ADVANCE INTO
THE LOWER OH VALLEY AND CNTRL GULF STATES BY EARLY FRIDAY MORNING
AND STRONGEST CONVECTION SHOULD BECOME CONCENTRATED NEAR THE GULF
COAST BY SUNRISE DAY5.

..DARROW.. 04/15/2013

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