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Mesoscale Discussion 1125 |
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MESOSCALE DISCUSSION 1125
NWS STORM PREDICTION CENTER NORMAN OK
0332 PM CDT MON JUN 11 2012
AREAS AFFECTED...W-CNTRL AND NW TX
CONCERNING...SEVERE POTENTIAL...WATCH LIKELY
VALID 112032Z - 112130Z
PROBABILITY OF WATCH ISSUANCE...80 PERCENT
SUMMARY...THE THREAT FOR LARGE HAIL AND DMGG WIND GUSTS IS
INCREASING OVER PARTS OF W-CNTRL AND NW TX. A WW WILL LIKELY BE
NEEDED WITHIN THE NEXT HR.
DISCUSSION...SFC ANALYSIS FROM 20Z PLACES A DEEPENING SFC LOW NEAR
SPS...WITH A SLOW-MOVING COLD FRONT ORIENTED SW-NE ACROSS N TX.
RECENT VISIBLE SATELLITE IMAGES SHOW INDICATIONS OF A DEVELOPING
SFC-BASED CU FIELD 40 NW MWL OCCURRING ALONG WIND SHIFT...AND
ADDITIONAL TOWERING CU DEVELOPING APPROXIMATELY 30 N SJT. VERY
STRONG BOUNDARY LAYER HEATING...WITH TEMPERATURES REACHING NEAR 100
F...HAS BEEN SUFFICIENT TO OVERCOME A WARM LAYER NEAR 850 MB
OBSERVED IN 12Z SOUNDINGS. FORCING FOR ASCENT IS EXPECTED TO BE
WEAK...BUT GIVEN THE STRONG HEATING AND CONTINUED WEAK CONVERGENCE
ALONG/NEAR WIND SHIFT AND ATTENDANT DRYLINE...INITIATION OF AT LEAST
ISOLATED STORMS APPEARS INCREASINGLY LIKELY. WITH MLCAPE VALUES NOW
EXCEEDING 4000 J/KG IN SOME AREAS...STORMS WILL LIKELY BE CAPABLE OF
PRODUCING VERY LARGE HAIL AND ISOLATED DMGG WIND GUSTS...BUT STORM
ORGANIZATION SHOULD BE SOMEWHAT LIMITED BY WEAK EFFECTIVE SHEAR
/NEAR 20 KTS/.
..ROGERS/MEAD.. 06/11/2012
ATTN...WFO...FWD...OUN...SJT...LUB...MAF...
LAT...LON 33209728 32459837 31789923 31309965 30900009 30830083
31570142 32410155 32870094 33469880 33849790 33859730
33749705 33209728
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