MESO: Mesoscale Discussion 1501

ACUS11 KWNS 210008
SWOMCD
SPC MCD 210008
SDZ000-NEZ000-COZ000-WYZ000-210115-

MESOSCALE DISCUSSION 1501
NWS STORM PREDICTION CENTER NORMAN OK
0708 PM CDT FRI JUN 20 2008

AREAS AFFECTED...ERN WY...SWRN SD...WRN NEB AND NERN CO

CONCERNING...SEVERE THUNDERSTORM WATCH 587...

VALID 210008Z - 210115Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 587
CONTINUES.

SCATTERED TO SEVERE THUNDERSTORMS CONTINUE TO SPREAD SEWD ACROSS THE
WATCH IN WY/SD/NEB...WHILE A SUPERCELL IN MORGAN COUNTY...CO WAS
MOVING ALMOST DUE SOUTH. THOUGH DEWPOINTS WERE MOSTLY IN THE
40S...STEEP MID LEVEL LAPSE RATES WERE RESULTING IN MLCAPES AROUND
1000 J/KG. DIURNAL HEATING PLAYED A LARGE ROLE IN THE STORM
INTENSITIES AND THEY SHOULD BEGIN TO DECREASE IN STRENGTH SOMEWHAT
WITH THE LOSS OF DAYTIME HEATING. THE EXCEPTION MAY BE THE SUPERCELL
IN NERN CO AS THE COMBINATION OF SELY BOUNDARY LAYER WINDS AND A
POOL OF HIGHER INSTABILITY MAY SUSTAIN THE STORM SWD THROUGH THE
EVENING HOURS. HAIL AND SOME SEVERE WIND GUSTS ARE THE MAIN
THREATS...THOUGH THE SWD MOVING STORM IN CO MAY OBTAIN SUFFICIENT
1KM SRH FOR A BRIEF TORNADO.

..IMY.. 06/21/2008

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

ATTN...WFO...LBF...UNR...GLD...BOU...CYS...RIW...

44960590 44860402 44620329 45000261 44250173 43790202
42380267 40870229 39610208 39410544 40410598 41840533
42460612

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