SWODY1
SPC AC 210029
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0629 PM CST THU NOV 20 2008
VALID 210100Z - 211200Z
...NO TSTM AREAS FORECAST...
...PACIFIC NW...
UPPER TROUGH IS MOVING INLAND ACROSS WA/ORE THIS EVENING WITH SFC
FRONT NOW PROGRESSING EAST OF THE CASCADES. NUMEROUS SHOWERS
CONTINUE WITHIN WLY FLOW REGIME WHERE LOW LEVEL LAPSE RATES ARE
FAIRLY STEEP...IN EXCESS OF 7C/KM. EVEN SO THE APPARENT CLOUD
DEPTH/INTENSITY IS INADEQUATE FOR MORE THAN ISOLATED LIGHTNING WITH
STRONGER CORES. COVERAGE OF THUNDERSTORMS WILL BE INADEQUATE TO
MAINTAIN GENERAL THUNDERSTORMS OUTLOOK.
...GREAT LAKES...
CONVECTION WILL CONTINUE ACROSS THE WARMER WATERS OF THE GREAT LAKES
TONIGHT...AND REGIONS IMMEDIATELY DOWNSTREAM BENEATH LARGE SCALE
UPPER TROUGHING. OBSERVED/FORECAST SOUNDINGS SUGGEST THERE MAY BE
ISOLATED LIGHTNING NEAR/OVER THE WATER BUT COVERAGE IS TOO LOW TO
WARRANT A THUNDER OUTLOOK.
..DARROW.. 11/21/2008
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