SWOMCD
SPC MCD 070008
NEZ000-SDZ000-NDZ000-MTZ000-WYZ000-070115-
MESOSCALE DISCUSSION 1705
NWS STORM PREDICTION CENTER NORMAN OK
0708 PM CDT SUN JUL 06 2008
AREAS AFFECTED...SERN MT / NRN WY / WRN SD
CONCERNING...SEVERE THUNDERSTORM WATCH 660...
VALID 070008Z - 070115Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 660
CONTINUES.
TSTMS WITHIN WW600 WILL LIKELY CONTINUE TO BE CAPABLE OF LARGE
HAIL/DAMAGING WINDS FOR THE NEXT SEVERAL HOURS...ESPECIALLY ACROSS
PARTS OF EXTREME SERN MT/NERN WY/WRN SD.
LATEST RADAR IMAGERY SHOWS DISCRETE TSTMS /OCCASIONALLY EXHIBITING
SUPERCELL STRUCTURE/ ACROSS THE ERN PARTS OF WW660. RECENT SURFACE
ANALYSIS INDICATED GREATER MOISTURE /MID 50S-LOWER 60S SFC TDS/ IN
NERN WY/SERN MT/WRN SD...IMPLYING GREATER INSTABILITY RESIDES WITHIN
THIS ZONE. ISOLATED NATURE OF STORMS IN THIS AREA MAY CONTINUE TO
BE CAPABLE OF LARGE HAIL IN ADDITION TO DAMAGING WINDS. IT APPEARS
THE CARTER CO. MT SUPERCELL MAY CONTINUE EWD INTO BUTTE CO. SD
POSING A CONTINUED RISK OF LARGE HAIL /PERHAPS SIGNIFICANT/ AND
DAMAGING WINDS.
FURTHER SW ACROSS C WY...STORM/COLD POOL INTERACTIONS HAVE
EFFECTIVELY BEEN ABLE TO CONVECTIVELY OVERTURN THE
AIRMASS...REDUCING STORM POTENTIAL FOR LARGE HAIL/DAMAGING WINDS.
IT APPEARS THE SEVERE THREAT WILL BE MORE SHORT-LIVED ACROSS THIS
REGION COMPARED TO THE NERN PARTS OF WW660 DUE TO WEAKENING
INSTABILITY AND WEAKER OVERALL DEEP LAYER SHEAR /PER 00Z OBJECTIVE
ANALYSIS FIELDS/.
..SMITH.. 07/07/2008
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...BIS...LBF...UNR...CYS...BYZ...GGW...RIW...
42260903 44601039 45610889 46110886 46380777 46830785
46630401 45930403 45940297 45050296 45030198 42970207
42980405 43470402 43480608 42420607 42440751 42250752
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