ZCZC SPCSWODY1 ALL ACUS01 KWNS 011255 SPC AC 011255 STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS. VALID 011300Z - 021200Z THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 25 SSE CSV TYS 30 SSE SPA 20 SE AGS 45 ENE ABY 20 E MAI 35 NE CEW 15 SW SEM 25 SSW HSV 55 WNW CHA 25 SSE CSV. THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 40 E INL 45 NW BRD 55 N ATY 35 SSE PHP 30 SW PHP 30 NE RAP 60 NNE ISN. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 ENE DLH 20 ENE STC 30 S RWF 20 ENE SUX 10 WNW OLU 20 S LBF 20 NNW GLD 30 NNW LAA 55 WSW CVS 10 SW CNM 25 SW INK 30 SE MAF 65 NW ABI 25 W LTS 35 WNW PNC 15 SSW FLV 20 SW LWD 30 ESE DSM 20 SE CID 45 E MLI 30 SW SBN 35 NNE FWA CLE 10 ESE FKL 35 SW IPT 30 NE CXY 20 NW PHL 25 ENE ACY ...CONT... 70 WSW TUS 45 W SAD 35 S GUP 30 NNE DRO 25 ESE EGE 40 NW LAR 50 N CPR 30 N WRL 40 W COD 50 SW MQM 70 SSE S80 20 ESE LWS 30 ENE 3TH 50 NNE FCA. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 15 SW PWM 15 N LCI 10 SW MPV 15 SE SLK 35 N ART. ...NRN PLAINS INTO NWRN MN... AN UPPER RIDGE WILL REMAIN OVER THE CENTRAL-NRN PLAINS THROUGH THE DAY...VERY STEEP LAPSE RATES SPREADING ACROSS THIS REGION AND SUBSEQUENTLY KEEPING MUCH OF THE REGION CAPPED THROUGH THE AFTERNOON. SLY LOW-LEVEL FLOW WILL ADVECT MOISTURE NWD WITH UPPER 60S SURFACE DEWPOINTS REACHING THE CENTRAL-ERN DAKOTAS LATER TODAY. THE STEEP LAPSE RATES EXPECTED ABOVE THE INCREASING LOW-LEVEL MOISTURE AND STRONG SURFACE HEATING WILL RESULT IN MODERATE INSTABILITY. A SHORT WAVE TROUGH MOVING INTO THE DAKOTAS AFTER 00Z WILL AID IN INITIATING CONVECTION ALONG A TROUGH PROGGED TO BE IN THE WRN DAKOTAS BY 00Z. STORMS WILL LIKELY SPREAD NEWD INTO ERN ND/NRN SD AND EVENTUALLY REACHING NWRN MN OVERNIGHT. AS THE SHORT WAVE TROUGH TOPS THE RIDGE OVER THE DAKOTAS THIS EVENING AND OVERNIGHT...A STRENGTHENING SLY LLJ AND INCREASING DEEP LAYER SHEAR WILL SUPPORT ORGANIZED STRONG TO SEVERE STORMS. FURTHER SOUTH ALONG THE LEE TROUGH INTO WRN NEB AND FAR NERN CO... STRONG SURFACE HEATING INTO THE UPPER 90S TO NEAR 100 MAY BREAK THE CAP LATER THIS AFTERNOON AS INDICATED BY MODELS WITH CONVECTION FORMING OVER THIS AREA. ANY STORMS THAT CAN DEVELOP WILL LIKELY BECOME SEVERE GIVEN SUFFICIENT DEEP LAYER SHEAR COMBINED WITH MODERATE INSTABILITY. THERMODYNAMIC PROFILES ACROSS THIS AREA FAVOR A DAMAGING WIND THREAT WITH STEEP LAPSE RATES ALSO SUPPORTING A HAIL THREAT. ...SERN STATES... EARLY MORNING SURFACE ANALYSIS SHOWS THE SURFACE LOW ASSOCIATED WITH THE REMNANTS OF T.S. BILL OVER WEST CENTRAL AL NEAR MEI... WHILE IR IMAGERY SHOWS THE MID-UPPER LEVEL CIRCULATION OVER CENTRAL AL. LATEST TPC GUIDANCE INDICATES THE SURFACE LOW WILL MOVE NEWD THROUGH CENTRAL-NRN AL TODAY...REACHING SERN TN BY 12Z WEDNESDAY. ENHANCED LOW-LEVEL CIRCULATION WITH THIS TROPICAL SYSTEM COMBINED WITH VERY LOW-LCLS AND A MOIST AIR MASS WILL AID IN A THREAT FOR ISOLATED TORNADOES ALONG AND EAST OF THE TRACK OF THE REMNANTS OF T.S. BILL. ...NRN NEW ENGLAND... SHORT WAVE TROUGH/MID-LEVEL WNWLY 50 KT SPEED MAX...CURRENTLY OVER ONTARIO/LAKE SUPERIOR PER WV IMAGERY...WILL MOVE SEWD AND ACROSS NRN NEW ENGLAND LATE THIS AFTERNOON/EVENING INCREASING DEEP LAYER SHEAR. SURFACE HEATING COMBINED WITH SURFACE DEWPOINTS IN THE 50S AND 6.5 TO 7 C/KM LAPSE RATES SPREADING ACROSS THIS REGION THIS AFTERNOON AND EVENING WILL RESULT IN MARGINAL INSTABILITY /MLCAPE 500-1000 J/KG/. SUFFICIENT DEEP LAYER SHEAR COMBINED WITH THE MARGINAL INSTABILITY WILL SUPPORT ISOLATED STRONG STORMS AS THUNDERSTORMS MOVE FROM QUEBEC INTO UPSTATE NY TO NRN MAINE THIS AFTERNOON/EVENING. ...WRN-CENTRAL MT... AN UPPER TROUGH WILL MOVE EWD INTO WRN CANADA AND THE NRN ROCKIES THIS PERIOD WITH 40-50 KT SWLY FLOW EXTENDING FROM NRN CA INTO WRN- CENTRAL MT. ALTHOUGH MODELS SHOW CONVECTION DEVELOPING OVER THE HIGHER TERRAIN OF WRN MT THIS AFTERNOON AND EVENING...WEAK INSTABILITY IS EXPECTED TO LIMIT THE POTENTIAL FOR SEVERE STORMS. ..PETERS/CROSBIE.. 07/01/03 NNNN |