[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 271956
SWOMCD
SPC MCD 271956
GAZ000-ALZ000-TNZ000-MSZ000-272200-

MESOSCALE DISCUSSION 0629
NWS STORM PREDICTION CENTER NORMAN OK
0256 PM CDT WED APR 27 2011

AREAS AFFECTED...MUCH OF MS/AL INTO SOUTHERN TN AND NORTHWEST GA

CONCERNING...TORNADO WATCH 232...235...

VALID 271956Z - 272200Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 232...235...CONTINUES.

PARTICULARLY DANGEROUS SITUATION /PDS/ TORNADO WATCHES 232/235
CONTINUE UNTIL 00Z/03Z RESPECTIVELY. THIS INCLUDES THE POTENTIAL FOR
LONG-TRACK STRONG/PERHAPS VIOLENT TORNADOES INTO THIS EVENING AS A
SEVERE WEATHER OUTBREAK ONLY INCREASES IN MAGNITUDE/RISK.

AN EXTREMELY DANGEROUS/LIFE-THREATENING SITUATION CONTINUES TO
UNFOLD THIS AFTERNOON ACROSS A LARGE PART OF MS/AL...WITH ADJACENT
PORTIONS OF TN/NORTHWEST GA ALSO EXPECTED TO BECOME A CONCERN LATE
THIS AFTERNOON/EVENING. CURRENT OBSERVATIONAL TRENDS...REASONABLY
SUPPORTED BY EXPERIMENTAL HRRR GUIDANCE...IMPLY THAT SCATTERED
SUPERCELLS WILL CONTINUE TO FORM IN BROKEN NNE-SSW ORIENTED
CORRIDORS OF SUBTLE CONFLUENCE AHEAD /EAST/ OF MORE
STORMS/SUPERCELLS THAT ARE DEVELOPING ALONG A PRE-COLD FRONTAL
TROUGH/DRYLINE GENERALLY NEARING I-55 IN MS.

THE WARM SECTOR AIRMASS HAS AGGRESSIVELY DESTABILIZED THIS AFTERNOON
AMID NEAR 70F/LOWER 70S F SURFACE DEWPOINTS...REFERENCE SPECIAL 18Z
OBSERVED RAOBS FROM JACKSON MS/BIRMINGHAM AL...WITH A WIDE/HIGHLY
SHEARED MOIST SECTOR IN PLACE ALONG/SOUTH OF A MODIFYING WEST-EAST
OUTFLOW BOUNDARY /NOW AN EFFECTIVE WARM FRONT/ ACROSS FAR NORTHERN
PORTIONS OF AL/MS. EXTREME LOW LEVEL SHEAR...VIA LONG/CURVING LOW
LEVEL HODOGRAPHS...WILL REMAIN HIGHLY CONDUCIVE FOR SUPERCELLS
CAPABLE OF LONG-TRACK STRONG/VIOLENT TORNADOES INTO THIS EVENING
AMID 0-1 KM SRH OF 300-500 M2/S2 OR GREATER /ESPECIALLY NEAR THE
AFOREMENTIONED NORTHERN MS AND AL BOUNDARY/.

..GUYER.. 04/27/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MRX...FFC...OHX...BMX...HUN...MOB...MEG...JAN...

LAT...LON   31419103 33129004 34948902 35258559 33928523 31558765
            31419103



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