Tag: "watch possible"
Watch Possible For NW Alabama
MESOSCALE DISCUSSION 0482
NWS STORM PREDICTION CENTER NORMAN OK
0939 PM CDT TUE APR 19 2011
AREAS AFFECTED…NRN MS THROUGH NRN AL AND MIDDLE TN
CONCERNING…SEVERE POTENTIAL…WATCH LIKELY
VALID 200239Z – 200345Z
A WW WILL LIKELY BE NEEDED BY 03Z FOR PORTIONS OF NRN MS…EXTREME
NWRN AL INTO MIDDLE TN. THREAT WILL EXIST FOR DAMAGING WIND…LARGE
HAIL AND ISOLATED TORNADOES.
EXPANSIVE QLCS EXTENDS FROM NRN IND SWWD THROUGH ERN AR WITH SRN END
MOVING EAST AT 40 KT. THE ATMOSPHERE REMAINS MODERATELY UNSTABLE
EAST OF THE LINE. DESPITE PRESENCE OF A CAPPING INVERSION…DEEPER
FORCING FOR ASCENT WITH PROGRESSIVE SHORTWAVE TROUGH WILL LIKELY
WEAKEN THE CAP ENOUGH FOR STORMS TO CONTINUE DEVELOPING ALONG THE
ADVANCING CONVECTIVE OUTFLOW BOUNDARY. A PREDOMINANT LINEAR MODE
WILL SUPPORT DAMAGING WIND AS PRIMARY THREAT. HOWEVER…SRN
EXTENSION OF A STRONG SLY LLJ WILL MAINTAIN 0-1 KM HODOGRAPHS
SUFFICIENT FOR A LINGERING THREAT OF MESOCYCLONES AND ISOLATED
TORNADOES EMBEDDED WITHIN THE QLCS.
..DIAL.. 04/20/2011
