Tuesday, April 24, 2007

MESO: Mesoscale Discussion 0555

ACUS11 KWNS 240637
SWOMCD
SPC MCD 240637
KSZ000-NEZ000-COZ000-240800-

MESOSCALE DISCUSSION 0555
NWS STORM PREDICTION CENTER NORMAN OK
0137 AM CDT TUE APR 24 2007

AREAS AFFECTED...FAR NERN CO / NWRN KS / FAR SWRN NEB

CONCERNING...TORNADO WATCH 171...

VALID 240637Z - 240800Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 171 CONTINUES.

THE SUPERCELL/TORNADO THREAT IS EXPECTED TO GENERALLY DECREASE
THROUGH 09-10Z FROM W-E ACROSS WW 171 AREA. PRIOR TO THIS...AN
ISOLATED TORNADO REMAINS POSSIBLE NAMELY OVER HITCHCOCK AND RED
WILLOW COUNTIES IN SWRN NEB.

AS OF 0620Z...GLD RADAR IMAGERY INDICATED AN EVOLVING QUASI-LINEAR
MCS FROM PERKINS AND CHASE COUNTIES IN SWRN NEB TO YUMA AND KIT
CARSON COUNTIES IN NERN CO...IMMEDIATELY IN THE WAKE OF AN ORGANIZED
COLD POOL SURGING ESEWD AT 20-25 KT. DOWNSTREAM...SUPERCELL STORMS
ARE STILL PRESENT OVER HITCHCOCK AND RED WILLOW COUNTIES IN SWRN NEB
VERY NEAR SYNOPTIC WARM FRONT SLOWLY LIFTING NWD. THE POTENTIAL FOR
LARGE HAIL AND PERHAPS A TORNADO OR TWO WILL REMAIN POSSIBLE WITH
THESE TWO CELLS THROUGH 08Z. THEREAFTER...STORMS MAY WEAKEN OR TEND
TO BECOME ELEVATED ABOVE NEAR SURFACE INVERSION N OF WARM FRONT...OR
BE OVERTAKEN BY EVOLVING MCS APPROACHING FROM THE W.

THE TORNADO THREAT SHOULD TEND TO DIMINISH ACROSS WW AREA BY 09-10Z
AS MCS AND ASSOCIATED COLD POOL CONTINUE EWD THROUGH NWRN KS/SWRN
NEB.

.MEAD.. 04/24/2007

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

ATTN...WFO...GID...LBF...DDC...GLD...BOU...

40540309 40860134 40529995 39809931 38959952 38870186
38800331

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