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MESOSCALE DISCUSSION 0476
NWS STORM PREDICTION CENTER NORMAN OK
0636 AM CDT TUE APR 14 2009
AREAS AFFECTED...NORTH CENTRAL FL PENINSULA
CONCERNING...TORNADO WATCH 154...
VALID 141136Z - 141230Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 154 CONTINUES.
TORNADO WATCH 154 CONTINUES ACROSS THE NORTH CENTRAL FL PENINSULA
UNTIL 18Z...WITH A RISK FOR TORNADOES/DAMAGING WINDS...ALONG WITH
HAIL.
LONG LIVED/HIGH ORGANIZED SQUALL LINE/LEWP...INCLUDING AT LEAST
THREE EMBEDDED BOOKEND VORTICES...CONTINUES TO ADVANCE
EAST-NORTHEASTWARD ACROSS THE EASTERN GULF TOWARD THE NORTHWEST/WEST
CENTRAL FL PENINSULA AT AROUND 40 KT AS OF 1130Z.
ACCORDINGLY...SEVERE POTENTIAL WILL LIKELY INCREASE OVER THE NEXT
FEW HOURS AS THE MCS AND/OR LEADING DEVELOPMENT MOVE ONSHORE. AHEAD
OF THIS ACTIVITY...A GRADUALLY WARMING/MOISTENING BOUNDARY
LAYER...ALONG WITH EAST-SOUTHEASTERLY LOW LEVEL FLOW/ESTIMATED 0-1
KM SRH OF 200-300 MS/S2...WILL SUPPORT A SUSTAINED SEVERE RISK
THROUGH THE MORNING INCLUDING BOWING STRUCTURES AND EMBEDDED OR
PERHAPS QUASI-DISCRETE/LINE LEADING SUPERCELLS.
..GUYER.. 04/14/2009
ATTN...WFO...MLB...TBW...JAX...TAE...
LAT...LON 28778341 29618290 29698194 29238085 27868092 27308291
28778341
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