[BNAWX] Severe Storm Outlook Narrative

[EMWIN Server]

ACUS11 KWNS 021522
SWOMCD
SPC MCD 021522
KYZ000-INZ000-TNZ000-ILZ000-MOZ000-ARZ000-021715-

MESOSCALE DISCUSSION 0205
NWS STORM PREDICTION CENTER NORMAN OK
0922 AM CST FRI MAR 02 2012

AREAS AFFECTED...PARTS OF SE MO...SRN IL...SRN IN...WRN AND CNTRL
KY...WRN TN

CONCERNING...SEVERE POTENTIAL...TORNADO WATCH LIKELY

VALID 021522Z - 021715Z

A RAPID INCREASE IN THE SEVERE STORM POTENTIAL APPEARS POSSIBLE BY
MIDDAY...INCLUDING THE RISK FOR STRONG TORNADOES AND VERY LARGE
HAIL.

MODELS INDICATE THAT THE CYCLONIC 500 MB JET CORE IS IN THE PROCESS
OF INTENSIFYING IN EXCESS OF 100 KT...AS ITS EXIT REGION NOSES
ACROSS THE MISSOURI OZARKS TOWARD CENTRAL ILLINOIS THROUGH EARLY
AFTERNOON.  STRONGEST MID-LEVEL HEIGHT FALLS WILL BE FOCUSED JUST TO
THE NORTHWEST OF THIS FEATURE...BUT THE SOUTHERN FRINGE OF STRONGER
FORCING FOR UPWARD VERTICAL MOTION APPEARS LIKELY TO WEAKEN
INHIBITION IN THE WARM SECTOR AN ASSOCIATED DEEPENING SURFACE
CYCLONE.  AS THE CENTER OF THE LOW TRACKS EAST OF THE MISSISSIPPI
RIVER...AND NORTHEASTWARD THROUGH SOUTHERN ILLINOIS... MODELS
SUGGEST THE DEVELOPMENT AND SHARPENING OF A PRE-COLD FRONTAL DRY
LINE BY THE 17-19Z TIME FRAME...SOUTH OF THE LOW ACROSS SOUTHERN
ILLINOIS INTO THE VICINITY OF THE MISSISSIPPI RIVER.  STRENGTHENING
LOW-LEVEL WARM ADVECTION ALONG AND EAST OF THIS FEATURE...COUPLED
WITH WEAK TO MODERATE BOUNDARY LAYER DESTABILIZATION BENEATH THE
MID-LEVEL DRY SLOT...MAY SERVE TO FOCUS THE INITIATION OF DISCRETE
STORMS.  IN THE PRESENCE OF VERY STRONG SHEAR...AND LARGE CLOCKWISE
CURVED LOW-LEVEL HODOGRAPHS BENEATH A 50+ KT SOUTHWESTERLY 850 MB
JET...THE ENVIRONMENT WILL BE CONDUCIVE TO LONG-LIVED SUPERCELLS.

VERY LARGE HAIL IS POSSIBLE FROM THE OUTSET...AND TORNADIC POTENTIAL
MAY ALSO INCREASE QUICKLY...WITH POTENTIAL FOR PARTICULARLY STRONG
AND DAMAGING TORNADOES INCREASING THROUGH THE AFTERNOON.  GIVEN THE
STRENGTH OF THE DEEP LAYER WESTERLY MEAN FLOW /50-60+ KT/...CELLS
WILL BE FAST MOVING...BUT ADDITIONAL STRONG/SEVERE STORMS COULD
DEVELOP IN ITS WAKE...AS THE COLD FRONT OVERTAKES THE DRY LINE EAST
OF THE MISSISSIPPI VALLEY LATER THIS AFTERNOON.

..KERR.. 03/02/2012

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

ATTN...WFO...LMK...OHX...IND...PAH...ILX...MEG...

LAT...LON   36018975 37338955 37878912 38728842 39278743 39348634
            38518562 36938575 35218776 35028904 35149006 36018975



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