SWOMCD
SPC MCD 211928
COZ000-WYZ000-UTZ000-212100-
MESOSCALE DISCUSSION 1264
NWS STORM PREDICTION CENTER NORMAN OK
0228 PM CDT SUN JUN 21 2009
AREAS AFFECTED...NERN UT...NWRN CO...SWRN WY
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 211928Z - 212100Z
THUNDERSTORMS PRODUCING LARGE HAIL AND DAMAGING WINDS WILL REMAIN
POSSIBLE THROUGH THE AFTERNOON OVER NERN UT...NWRN CO AND SWRN WY.
THIS AREA WILL BE MONITORED FOR A WW.
WV IMAGERY INDICATES A SMALL/SUBTLE LOW AMPLITUDE UPPER LEVEL
IMPULSE QUICKLY MOVING ENE ACROSS SRN UT AND TOWARD WRN CO. ASCENT
AHEAD OF THIS FEATURE...COMBINED WITH AIRMASS DESTABILIZATION DUE TO
FAVORABLE SURFACE HEATING HAVE RESULTED IN SCATTERED THUNDERSTORM
DEVELOPMENT ACROSS NERN UT AND NWRN CO. STEEP MID LEVEL LAPSE RATES
AND DEWPOINTS IN THE UPPER 40S TO LOW 50S ARE FAVORING MLCAPE VALUES
UPWARDS OF 1000 J/KG. IN ADDITION...AREA VWP DATA AND RUC FORECAST
SOUNDINGS INDICATE STRONG DEEP LAYER VERTICAL WIND SHEAR...FAVORABLE
FOR SUPERCELLS. THESE CONDITIONS ARE FORECAST TO PERSIST THROUGH THE
MID TO LATE AFTERNOON...FAVORING THE POTENTIAL FOR LARGE HAIL AND
DAMAGING WINDS WITH THE STRONGER UPDRAFT CORES.
..GARNER.. 06/21/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BOU...CYS...RIW...GJT...SLC...
LAT...LON 38480726 38200964 38351180 39021252 39891257 40911158
41561042 41670833 41000680 39650628 38480726
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