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| Mesoscale Discussion 728 |
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MESOSCALE DISCUSSION 0728
NWS STORM PREDICTION CENTER NORMAN OK
1221 PM CDT FRI APR 25 2008
AREAS AFFECTED...NERN MO...ERN IA...WRN IL
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 251721Z - 251815Z
CONVECTION IS BEGINNING TO INTENSIFY ALONG ADVANCING COLD FRONT FROM
THE MO/IA BORDER...SWD TO NEAR I-70 IN CNTRL MO PER RAPID INCREASE
IN LIGHTNING AND REFLECTIVITY. THIS ACTIVITY SHOULD CONTINUE TO
EXPAND IN AREAL COVERAGE AS COLD FRONT SURGES EWD INTO ERN IA AND
WRN IL. LATEST DIAGNOSTIC DATA SUGGESTS BOUNDARY LAYER AIRMASS HAS
DESTABILIZED SIGNIFICANTLY OVER THE LAST FEW HOURS WITH SBCAPE
VALUES NOW ON THE ORDER OF 1500 J/KG. VERTICAL SHEAR PROFILES ARE
MORE THAN ADEQUATE TO SUSTAIN DISCRETE SUPERCELL
STRUCTURES...ALTHOUGH STRONG FORCING MAY ULTIMATELY RESULT IN A
SQUALL LINE WITH EMBEDDED SUPERCELLS. EVEN SO...IT APPEARS SEVERE
THREAT...INCLUDING ISOLATED TORNADOES...IS INCREASING ACROSS THE MID
MS VALLEY. WW WILL LIKELY BE ISSUED WITHIN THE HOUR.
..DARROW.. 04/25/2008
ATTN...WFO...LOT...ILX...LSX...DVN...DMX...EAX...
38709301 40689277 42639153 42058933 38789091
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