SWODY3
SPC AC 210701
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0201 AM CDT FRI OCT 21 2011
VALID 231200Z - 241200Z
...SYNOPSIS...
A PROGRESSIVE LONGWAVE REGIME WILL EXIST OVER THE CONUS ON SUNDAY.
AS A STRONG POLAR JET SHIFTS EASTWARD OVER THE NORTHERN TIER OF THE
CONUS...ONE SHORTWAVE TROUGH WILL SPREAD EASTWARD OVER NORTHERN
PORTIONS OF MANITOBA/ONTARIO...WHILE HEIGHT FALLS OCCUR OVER MUCH OF
THE WESTERN STATES IN ADVANCE OF A FAST-MOVING/MODESTLY AMPLIFYING
SHORTWAVE TROUGH OVER THE PACIFIC NORTHWEST.
POTENTIALLY LINGERING FROM DAY 2/SATURDAY...ISOLATED TSTMS MAY BE
POSSIBLE MAINLY EARLY SUNDAY ACROSS THE ARKLATEX. OTHER MORE
ISOLATED TSTMS COULD OCCUR ACROSS THE GREAT LAKES REGION WITHIN A
STEEP LAPSE RATE ENVIRONMENT IN VICINITY OF AN ADVANCING SURFACE
FRONT/WITHIN UPPER JET EXIT REGION. IN EITHER CASE...SEVERE TSTMS
ARE NOT EXPECTED ON SUNDAY.
..GUYER.. 10/21/2011
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