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United States Severe Weather Center
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Overview
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Friday, September 3 1:21 PM UTC
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Day 1 Outlook
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Day 2 Outlook
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Day 3 Outlook
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Day 4 Outlook
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Day 5 Outlook
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Day 6 Outlook
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Day 7 Outlook
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996
ACUS02 KWNS 030601
SWODY2
SPC AC 030600
DAY 2 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0100 AM CDT FRI SEP 03 2010
VALID 041200Z - 051200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
A BROAD UPPER TROUGH WILL PIVOT EASTWARD OVER ONTARIO/QUEBEC AND THE
ADJACENT GREAT LAKES REGION ON SATURDAY...WHILE AN ADDITIONAL UPPER
TROUGH AMPLIFIES FROM THE BRITISH COLUMBIA COAST TO THE PACIFIC
NORTHWEST/NORTHERN INTERMOUNTAIN REGION BY LATE SATURDAY. THE
PRESENCE OF SURFACE HIGH PRESSURE AND COOL/DRIER CONTINENTAL
TRAJECTORIES IN THE WAKE OF A STRONG COLD FRONT WILL KEEP MOST CONUS
LOCALES THUNDER-FREE. SOME TSTMS WILL BE POSSIBLE ACROSS THE FL
PANHANDLE AND SOUTHERN ROCKIES VICINITY...WITH TSTMS /SOME STRONG TO
PERHAPS SEVERE/ ALSO INCREASING ACROSS MUCH OF MT SATURDAY
AFTERNOON/EARLY EVENING.
...MT...
AHEAD OF THE DIGGING PACIFIC NORTHWEST UPPER TROUGH...INFLUENCE OF
UPPER JET LEFT EXIT REGION...AND MODEST MOISTURE IN VICINITY OF A
SURFACE TROUGH/EASTWARD ADVANCING COLD FRONT...SHOULD SUPPORT
ISOLATED TO SCATTERED TSTM DEVELOPMENT...INITIALLY ACROSS MUCH OF
CENTRAL/SOUTHWEST MT SATURDAY AFTERNOON. WHILE LIMITED MOISTURE
AVAILABILITY SHOULD TEMPER THE OVERALL SEVERE RISK...00Z NAM/GFS
FORECAST SOUNDINGS REFLECT A DEEPLY MIXED BOUNDARY LAYER...WITH WEAK
CAPE /UP TO 500 J PER KG SBCAPE/ AND GRADUALLY STRENGTHENING FLOW
NEAR/ABOVE THE TOP OF THE FORECAST MIXED LAYER. THIS SCENARIO SHOULD
YIELD SOME TSTMS CAPABLE OF STRONG DOWNDRAFTS/GUSTY WINDS AND
PERHAPS SMALL HAIL SATURDAY AFTERNOON/EVENING.
..GUYER.. 09/03/2010
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