DAY1SVR: Day 1 Convective Outlook

ACUS01 KWNS 301926
SWODY1
SPC AC 301924

DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0224 PM CDT MON SEP 30 2013

VALID 302000Z - 011200Z

...NO SVR TSTM AREAS FORECAST...

...DISCUSSION...
NO SEVERE WEATHER IS EXPECTED WITH ONLY MINOR CHANGES TO
THUNDERSTORM AREAS. SEE PREVIOUS DISCUSSION FOR ADDITIONAL
INFORMATION.

..GRAMS.. 09/30/2013

.PREV DISCUSSION... /ISSUED 1048 AM CDT MON SEP 30 2013/

...SYNOPSIS/FORECAST...
SHORTWAVE TROUGHS EMBEDDED WITHIN A POLAR UPPER-AIR STREAM FROM THE
PACIFIC NW TO THE UPPER GREAT LAKES WILL SUPPORT AREAS OF
PRECIPITATION ACROSS THE NWRN/N-CNTRL CONUS THROUGH TONIGHT. WATER
VAPOR IMAGERY INDICATES ONE TROUGH MOVING ACROSS THE NRN GREAT BASIN
AND NRN ROCKIES...WHICH WILL REACH NRN MN BY LATE TONIGHT.
RELATIVELY COOLER MID-LEVEL CONDITIONS SUCCEEDING THIS TROUGH MAY
SUPPORT SUFFICIENT BUOYANCY AMIDST OROGRAPHIC ASCENT FOR ISOLATED
THUNDERSTORMS THIS AFTERNOON AND EVENING FROM THE PACIFIC NW TO THE
NRN ROCKIES. AN ISOLATED LIGHTNING STRIKE OR TWO CANNOT BE RULED OUT
AHEAD OF THE TROUGH FARTHER E INTO ND/NWRN MN. ANOTHER SHORTWAVE
TROUGH WILL APPROACH THE WA COAST BY LATE TONIGHT...WITH PRECEDING
ASCENT MAINTAINING THUNDERSTORM CHANCES OVERNIGHT TONIGHT ACROSS
COASTAL WA/NWRN ORE. ELSEWHERE...ISOLATED STORMS MAY OCCUR THROUGH
TONIGHT OVER THE LOWER MS VALLEY AND ACROSS THE GULF COAST REGION
WITHIN A MOIST AND MARGINALLY UNSTABLE AIR MASS. SEVERE
THUNDERSTORMS ARE NOT EXPECTED CONUS-WIDE.

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