SWODY1
SPC AC 130058
DAY 1 CONVECTIVE OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0658 PM CST FRI DEC 12 2008
VALID 130100Z - 131200Z
...NO SVR TSTM AREAS FORECAST...
...SYNOPSIS...
PATTERN TRANSITION IS UNDERWAY ALOFT...WITH PHASE SHIFT TOWARD MEAN
TROUGHING OVER WRN INSTEAD OF ERN NORTH AMERICA. STG SHORTWAVE
TROUGH NOW OVER SRN APPALACHIANS REGION WILL EJECT OFFSHORE
CAROLINAS/MID-ATLANTIC BY END OF PERIOD. ISALLOHYPSIC PATTERN WILL
CONSIST OF RISES ACROSS E AND FALLS OVER MUCH OF CENTRAL/NRN ROCKIES
AND GREAT BASIN...AHEAD OF STG SHORTWAVE TROUGH NOW DIGGING SEWD
OVER WA/ORE. LATTER TROUGH IS ANCHORED BY SMALL/PRONOUNCED
DEEP-LAYER CYCLONE -- CENTERED OVER STRAIT OF JUAN DE FUCA AS OF 23Z
AND FCST TO MOVE INLAND WA. VIS IMAGERY SHOWS LOW LEVEL COLD
FRONTAL ZONE HAS MOVED INTO WA/ORE CASCADES...TRAILING SWWD ACROSS
SWRN ORE/EXTREME NERN CA AREA. THIS FRONT WILL CONTINUE INLAND
ORE/WA THROUGH REMAINDER EVENING AND OVERNIGHT HOURS.
...PACIFIC NW COASTAL AREAS...
MRGL THUNDER POTENTIAL FCST TO DEVELOP AND SHIFT SWD ALONG COAST
THROUGH REMAINDER EVENING AS INCREASINGLY COLD AIR ALOFT BOOSTS
LOW-MIDLEVEL LAPSE RATES IN PACIFIC MARINE LAYER. MODIFIED 00Z SLE
RAOB AND TIME SERIES OF RUC/NAM-KF FCST SOUNDINGS SUGGEST THAT
BUOYANCY LAYER -- WITH MLCAPES UP TO 250 J/KG -- WILL EXTEND INTO
FAVORABLE ICING LAYERS FOR LIGHTNING PRODUCTION. DEEPEST FEW AMONG
NUMEROUS CONVECTIVE CLOUD ELEMENTS THEREFORE MAY YIELD ISOLATED LTG
STRIKES.
..EDWARDS.. 12/13/2008
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