MESO: Mesoscale Discussion 1815

ACUS11 KWNS 072356
SWOMCD
SPC MCD 072355
MTZ000-WYZ000-080130-

MESOSCALE DISCUSSION 1815
NWS STORM PREDICTION CENTER NORMAN OK
0655 PM CDT FRI AUG 07 2009

AREAS AFFECTED...PARTS OF NRN WY INTO SERN MT

CONCERNING...SEVERE THUNDERSTORM WATCH 672...

VALID 072355Z - 080130Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 672
CONTINUES.

SCATTERED...STRONG TO SEVERE STORMS REMAIN FOCUSED TO THE N OF
SYNOPTIC FRONT EXTENDING FROM S OF RAP TO NEAR WRL. AS OF
2345Z...THE GREATEST CONCENTRATION AND MOST INTENSE STORMS WERE
OBSERVED OVER YELLOWSTONE AND BIG HORN COUNTIES MT SWD TO BIG HORN
COUNTY WY. HERE...BOUNDARY LAYER WITHIN POST-FRONTAL AIR MASS
REMAINS MOIST AND MODERATELY UNSTABLE WITH MLCAPE OF 1000-1500 J/KG.
MOREOVER...BACKGROUND ASCENT IS BEING AUGMENTED BY UPPER-LEVEL
DIVERGENCE TO THE E/NE OF UPPER LOW OVER THE NRN INTERMOUNTAIN
REGION. VERTICAL SHEAR REMAINS SUPPORTIVE ORGANIZED
STORMS...INCLUDING SUPERCELLS WITH THE MAIN THREATS BEING HAIL AND
LOCALLY DAMAGING WINDS.

THROUGH 02Z...EXPECT THE GREATEST SEVERE THREAT TO EXIST FROM E OF
BIL TO S OF MLS AND BHK.

..MEAD.. 08/07/2009

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

ATTN...WFO...UNR...BYZ...RIW...

LAT...LON 45120908 45800895 46520791 46580663 46450574 46100478
45440446 44650419 44100439 43840529 43800657 44010801
45120908

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