ZCZC SPCSWODY1 ALL ACUS01 KWNS 231307 SPC AC 231305 STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS. VALID 231300Z - 241200Z NO SVR TSTM AREAS FCST. NO TSTM AREAS FCST. ...SYNOPSIS... MAIN ERN U.S. UPPER TROUGH IS FORECAST TO MOVE SLOWLY EWD AND EVENTUALLY OFF THE ATLANTIC COAST. BY THE END OF THE PERIOD...A BROAD AREA OF NWLY FLOW IS EXPECTED ACROSS THE MAJORITY OF THE CONUS DOWNSTREAM OF PERSISTENT RIDGE OVER THE WEST COAST / UPSTREAM OF DEPARTING ERN TROUGH. ...PAC NW COAST... LATE IN THE PERIOD...SHORT WAVE TROUGH IS FORECAST TO APPROACH THE PAC NW COAST...ALTHOUGH THE FEATURE WILL WEAKEN AS IT MOVES INTO THE MEAN RIDGE POSITION. LITTLE IF ANY INSTABILITY IS FORECAST TO REACH THE COAST...THUS PRECLUDING ANY APPRECIABLE THREAT FOR THUNDERSTORMS. ..GOSS.. 01/23/03 NNNN |