SWOMCD
SPC MCD 122220
OKZ000-TXZ000-122315-
MESOSCALE DISCUSSION 0458
NWS STORM PREDICTION CENTER NORMAN OK
0520 PM CDT SUN APR 12 2009
AREAS AFFECTED...PORTIONS OF SRN OK...N-CNTRL TX
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 122220Z - 122315Z
A MARGINAL SEVERE HAIL THREAT WILL CONTINUE THROUGH SUNSET ALONG THE
RED RIVER. AFTER COORDINATION WITH AFFECTED WFOS...A WW WILL NOT BE
ISSUED.
METEOROLOGICAL SCENARIO DESCRIBED IN MCD 457 REMAINS VALID. AS OF
2215Z...RADAR IMAGERY DEPICTED SEVERAL SINGLE CELLS INVOF SURFACE
DRYLINE EXTENDING ALONG THE RED RIVER IN SWRN OK/N-CNTRL TX SEWD
TOWARDS THE WRN FRINGES OF THE DFW METRO AREA. THE MAIN SEVERE
THREAT SHOULD CONTINUE TO BE THREE-QUARTER TO ONE INCH HAIL. DESPITE
MODEST LOW-LEVEL FLOW...MODERATE EFFECTIVE SHEAR AND COLD
TEMPERATURES ALOFT WILL SUPPORT BRIEF SUPERCELL STRUCTURES WITH
ISOLATED HAIL UP TO GOLF BALL SIZE POSSIBLE. HOWEVER...THE OVERALL
THREAT SHOULD HAVE A RELATIVELY LIMITED AREAL/TEMPORAL EXTENT GIVEN
WEAK DESTABILIZATION DOWNSTREAM AND THE LOSS OF DIURNAL HEATING
LIKELY RESULTING IN A RAPID DIMINISHMENT OF CONVECTION AROUND
SUNSET.
..GRAMS.. 04/12/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...
LAT...LON 34379983 34789968 34899894 34669788 34159671 33679634
33379637 33009660 32609722 32479771 33569853 34189934
34379983
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