ZCZC SPCSWODY1 ALL
ACUS01 KWNS 171628
SPC AC 171626

STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK 
DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS.

VALID 171630Z - 181200Z

NO SVR TSTM AREAS FCST.

GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 NNW CTB
45 NNW GTF 30 NW 3HT 40 E LVM 40 SE LVM 15 NNE WEY 50 W MQM
65 NNE BOI 10 NNW BNO 55 SSW RDM 25 SW OTH.

GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 15 SSW ACY JFK
10 NNE BDR 25 NNW HYA.

...PAC NW AND NRN ROCKIES AREA...
12Z SOUNDINGS REVEAL LOW-MID LEVEL LAPSE RATES AROUND 8 C/KM OVER
WA AND NEARBY PORTIONS OF ORE/ID/MT IN ASSOCIATION WITH 500 MB
TEMPERATURES OF -30 TO -32 C.  EMBEDDED SHORTWAVE TROUGHS NOW NEAR
46 N AND 130 W...AND A WEAKER SYSTEM OVER NW MT...WILL MOVE EWD
OVER THIS AREA TODAY AND TONIGHT.  THE COMBINATION OF SOME DAYTIME
HEATING...ASCENT IN ADVANCE OF THE MID LEVEL TROUGHS...AND STEEP
LAPSE RATES SHOULD BE SUFFICIENT FOR ISOLATED THUNDERSTORMS THROUGH
EARLY TONIGHT.

...SE NEW ENGLAND COAST...
INTENSE LOW-LEVEL WAA IS SUPPORTING WIDESPREAD FREEZING/FROZEN
PRECIPITATION ACROSS ALL OF SRN NEW ENGLAND LATE THIS MORNING.  AS
A MID LEVEL DRY SLOT DEVELOPS NEWD FROM THE MID ATLANTIC REGION
TOWARD SRN NEW ENGLAND THIS AFTERNOON...WEAK ELEVATED CONDITIONAL
INSTABILITY COULD SUPPORT ISOLATED LIGHTNING STRIKES WITHIN THE
MORE INTENSE/CONVECTIVE PRECIPITATION BANDS.  
 
..THOMPSON.. 02/17/03

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