SWODY3
SPC AC 220637
DAY 3 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1237 AM CST THU JAN 22 2009
VALID 241200Z - 251200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
NRN STREAM WILL BE CHARACTERIZED BY CYCLONIC FLOW OVER GREAT LAKES
AROUND MEAN TROUGHING OVER ERN CANADA...RIDGING OVER NERN PACIFIC
AND ERN AK/YUKON REGION. FARTHER S...SPLIT FLOW PATTERN WILL
PREVAIL...ANCHORED BY HIGH-AMPLITUDE/POSITIVELY-TILTED SYNOPTIC
TROUGH FROM COASTAL PACIFIC NW SSWWD ACROSS PACIFIC...OFFSHORE BAJA.
BY END OF PERIOD...NRN PORTION OF THIS TROUGHING WILL SHIFT INLAND
OVER PACIFIC NW...TO NEAR NRN CA COAST...WHILE SMALLER/POSITIVELY
TILTED SHORTWAVE TROUGH MOVES INLAND CENTRAL/NRN CA.
MEANWHILE...WEAKER DOWNSTREAM SHORTWAVE TROUGH -- CURRENTLY JUST
OFFSHORE SRN CA/NRN BAJA -- WILL MOVE EWD FROM TX COAST ACROSS NRN
GULF TO FL.
AT SFC...COLD FRONT DESCRIBED IN DAY-2 OUTLOOK WILL MOVE SEWD ACROSS
CAROLINAS...SRN APPALACHIANS...MS DELTA REGION AND S TX...REACHING
FROM SRN GA OR NRN FL WSWWD TO VICINITY BRO BY END OF PERIOD.
WSWLY-SWLY FLOW...ASSOCIATED LOW LEVEL WAA AND MID LEVEL MOISTENING
MAY INCREASE POTENTIAL FOR CONVECTION ACROSS PORTIONS WRN
INTERMOUNTAIN REGION AND GREAT BASIN...BUT MOISTURE AND INSTABILITY
EACH SHOULD REMAIN TOO WEAK TO SUPPORT SVR THREAT. INSTABILITY AND
LOW LEVEL LIFT ALSO SHOULD BE TOO WEAK TO SUPPORT SVR POTENTIAL WITH
ANY CONVECTION EMBEDDED IN NEAR-FRONTAL PRECIP PLUME ACROSS GULF
COAST STATES.
..EDWARDS.. 01/22/2009
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