SWOMCD
SPC MCD 020324
MTZ000-WYZ000-020430-
MESOSCALE DISCUSSION 1659
NWS STORM PREDICTION CENTER NORMAN OK
1024 PM CDT TUE JUL 01 2008
AREAS AFFECTED...PORTIONS S-CENTRAL/SERN MT...EXTREME N-CENTRAL/NERN
WY.
CONCERNING...SEVERE THUNDERSTORM WATCH 648...
VALID 020324Z - 020430Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 648
CONTINUES.
PRIMARY CONVECTIVE BAND WAS EVIDENT AT 03Z FROM CENTRAL PORTIONS BIG
HORN COUNTY MT SWD ACROSS NRN BIGHORN MOUNTAINS AND BIGHORN BASIN TO
ERN BIG HORN AND WASHAKIE COUNTIES WY. 57 KT GUST REPORTED AT SHR
AT 0311Z ALONG SRN PORTION OF MOST INTENSE TSTMS. ACTIVITY S OF SHR
AREA SWD WILL BE MOVING THROUGH AIR MASS STABILIZED BY
EARLIER/DIURNAL ACTIVITY IN MOUNTAINS...WITH ONLY PARTIAL RECOVERY
FROM WAA SINCE THEN. GUST POTENTIAL THEREFORE SHOULD BE SOMEWHAT
MUTED COMPARED TO THAT N OF I-90...WHERE RELATIVELY UNPERTURBED AIR
MASS REMAINS IN PROSPECTIVE INFLOW LAYER. MOST INTENSE PORTION OF
THIS ACTIVITY SHOULD CONTINUE TO MOVE GENERALLY EWD NEAR AND N OF
MT/WY BORDER -- ACROSS PORTIONS SHERIDAN/CAMPBELL COUNTIES WY AND
BIG HORN/POWER RIVER IN MT -- WITH POTENTIAL FOR STG-SVR GUSTS.
HOWEVER...MODIFIED RAOBS AND RUC FCST SOUNDINGS INDICATE INCREASING
SBCINH WITH TIME ACROSS SERN MT AS DIABATIC SFC COOLING
CONTINUES...WHICH IN TURN INDICATES PROGRESSIVELY STRONGER FORCED
ASCENT WITH TIME WILL BE REQUIRED TO MAINTAIN SFC-BASED INFLOW
PARCEL.
..EDWARDS.. 07/02/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...UNR...BYZ...RIW...
43880779 44600729 45100726 45750682 45810540 45640407
44350439 44360687 44000743
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