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Displaying AFOS PIL: SWODY1 Product Timestamp: 2002-04-29 01:25 UTC
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494 ACUS01 KWNS 290125 SWODY1 SPC AC 290113 STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS. VALID 290100Z - 291200Z THERE IS A MDT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 30 ESE ECG 45 ENE RWI 45 NNE RWI 30 NNW ORF 30 WNW SBY 35 SE DOV. THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 25 SSE OAJ 40 SW AGS 40 E 0A8 20 S GLH 15 SSW LIT 60 W MEM 40 SE BNA 15 W TYS 25 S EKN 35 NNE BWI 10 NE PHL 20 SE NEL. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 SE CHS 20 ESE LFK 45 ESE AUS 10 SE HDO 15 NW JCT 40 SSW ADM 35 NNE MEM 20 E BNA 35 NNW TYS 30 NE CRW 30 NNW PSB 45 E ART 35 NW RUT 20 SW PWM. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 35 W INL 35 WNW BRD 50 ENE ANW 15 S VTN 55 SSW PHP 60 NNW PHP 40 SSE P24 80 NE MOT. ...SYNOPSIS... STRONG MID-LEVEL SHORTWAVE TROUGH WILL CONTINUE MOVING EWD ACROSS THE NERN U.S. INTO NEW ENGLAND THROUGH THE END OF THIS PERIOD. AT THE SURFACE...LOW NOW ANALYZED IN W CENTRAL NY IS FORECAST TO BE OFF CAPE COD AT THE END OF THE PERIOD. COLD FRONT...NOW EXTENDING SWD FROM THE LOW ACROSS ERN PA AND THEN SWWD ALONG THE APPALACHIANS...IS FORECAST TO MOVE OFF THE MID-ATLANTIC COAST BETWEEN 29/06 AND 29/12Z. THE TRAILING SRN PORTION OF THE FRONT WHICH NOW EXTENDS WSWWD ACROSS THE TN AND LOWER MS VALLEYS INTO N CENTRAL TX WILL MOVE SLOWLY SWD / SEWD...AND IS EXPECTED TO LIE ROUGHLY W-E ACROSS THE GULF COAST STATES INTO CENTRAL TX BY THE END OF THE PERIOD. ...MID-ATLANTIC REGION SWWD INTO THE SOUTHEAST... STRONGEST STORMS / SUPERCELLS NOW MOVING OFF THE ATLANTIC COAST ACROSS MD / DE / VA AHEAD OF COLD FRONT...WITH A VERY SMALL BUT ENHANCED THREAT AREA FOR TORNADOES...LARGE HAIL...AND DAMAGING WINDS FOR THE NEXT HOUR OR SO. ALTHOUGH THE FRONT WILL MOVE OFF THE NJ / DE / VA COAST BETWEEN NOW AND 06Z...AIRMASS FURTHER SWWD AHEAD OF THE BOUNDARY FROM THE CAROLINAS INTO GA / AL REMAINS MODERATELY UNSTABLE WITH DEWPOINTS IN THE 60S TO NEAR 70 AND SURFACE-BASED CAPE GENERALLY 1000 TO 2000 J/KG. FURTHER SWWD...STRONGEST STORMS ONGOING ATTM REMAIN ALONG THE TN / AL BORDER AND INTO NRN GA. THESE STORMS WILL LIKELY PERSIST FOR SEVERAL HOURS WHILE MOVING SEWD AHEAD OF FRONT. MEANWHILE...SOME ADDITIONAL DEVELOPMENT IS POSSIBLE ALONG / AHEAD OF FRONT AS BOUNDARY MOVES ACROSS THE APPALACHIANS INTO THE CAROLINAS... ALTHOUGH STRONGEST UPPER SUPPORT WILL REMAIN N OF THE REGION AND MOVE INTO THE ATLANTIC. ALTHOUGH SURFACE FLOW WILL BECOME INCREASINGLY SWLY AHEAD OF FRONT...DEEP-LAYER FLOW WILL REMAIN STRONG THROUGH THE NIGHT WITH 40 TO 60 KT WLY FLOW AT 700 MB AND 50 TO 70 KTS AT MID-LEVELS. AS A RESULT...ONGOING STORMS IN THE TN VALLEY AND ANY NEW DEVELOPMENT AHEAD OF COLD FRONT EAST OF THE APPALACHIANS WILL LIKELY BECOME SEVERE...WITH A THREAT FOR PRIMARILY LARGE HAIL AND DAMAGING WINDS...AND PERHAPS A COUPLE OF TORNADOES. ...LOWER MS VALLEY REGION INTO CENTRAL AND NERN TX... THUNDERSTORM OVER CENTRAL TX HAS WEAKENED OVER THE PAST HALF HOUR...BUT ISOLATED DEVELOPMENT IS POSSIBLE INVOF SURFACE BOUNDARY FROM CENTRAL AND NERN TX EWD INTO SRN AR / NRN LA / NRN MS. ALTHOUGH LOW-LEVEL FLOW IS WEAKER ACROSS THIS REGION...SUFFICIENT FLOW ALOFT SUGGESTS THAT A THREAT FOR PRIMARILY SEVERE HAIL WILL EXIST WITH ANY ADDITIONAL STORMS. ..GOSS.. 04/28/02
000 ACUS01 KWNS 290125 SWODY1 SPC AC 290113 STORM PREDICTION CENTER...NWS/NCEP...NORMAN OK DAY 1 CONVECTIVE OUTLOOK...REF AWIPS GRAPHIC PGWE46 KWNS. VALID 290100Z - 291200Z THERE IS A MDT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 30 ESE ECG 45 ENE RWI 45 NNE RWI 30 NNW ORF 30 WNW SBY 35 SE DOV. THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 25 SSE OAJ 40 SW AGS 40 E 0A8 20 S GLH 15 SSW LIT 60 W MEM 40 SE BNA 15 W TYS 25 S EKN 35 NNE BWI 10 NE PHL 20 SE NEL. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 SE CHS 20 ESE LFK 45 ESE AUS 10 SE HDO 15 NW JCT 40 SSW ADM 35 NNE MEM 20 E BNA 35 NNW TYS 30 NE CRW 30 NNW PSB 45 E ART 35 NW RUT 20 SW PWM. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 35 W INL 35 WNW BRD 50 ENE ANW 15 S VTN 55 SSW PHP 60 NNW PHP 40 SSE P24 80 NE MOT. ...SYNOPSIS... STRONG MID-LEVEL SHORTWAVE TROUGH WILL CONTINUE MOVING EWD ACROSS THE NERN U.S. INTO NEW ENGLAND THROUGH THE END OF THIS PERIOD. AT THE SURFACE...LOW NOW ANALYZED IN W CENTRAL NY IS FORECAST TO BE OFF CAPE COD AT THE END OF THE PERIOD. COLD FRONT...NOW EXTENDING SWD FROM THE LOW ACROSS ERN PA AND THEN SWWD ALONG THE APPALACHIANS...IS FORECAST TO MOVE OFF THE MID-ATLANTIC COAST BETWEEN 29/06 AND 29/12Z. THE TRAILING SRN PORTION OF THE FRONT WHICH NOW EXTENDS WSWWD ACROSS THE TN AND LOWER MS VALLEYS INTO N CENTRAL TX WILL MOVE SLOWLY SWD / SEWD...AND IS EXPECTED TO LIE ROUGHLY W-E ACROSS THE GULF COAST STATES INTO CENTRAL TX BY THE END OF THE PERIOD. ...MID-ATLANTIC REGION SWWD INTO THE SOUTHEAST... STRONGEST STORMS / SUPERCELLS NOW MOVING OFF THE ATLANTIC COAST ACROSS MD / DE / VA AHEAD OF COLD FRONT...WITH A VERY SMALL BUT ENHANCED THREAT AREA FOR TORNADOES...LARGE HAIL...AND DAMAGING WINDS FOR THE NEXT HOUR OR SO. ALTHOUGH THE FRONT WILL MOVE OFF THE NJ / DE / VA COAST BETWEEN NOW AND 06Z...AIRMASS FURTHER SWWD AHEAD OF THE BOUNDARY FROM THE CAROLINAS INTO GA / AL REMAINS MODERATELY UNSTABLE WITH DEWPOINTS IN THE 60S TO NEAR 70 AND SURFACE-BASED CAPE GENERALLY 1000 TO 2000 J/KG. FURTHER SWWD...STRONGEST STORMS ONGOING ATTM REMAIN ALONG THE TN / AL BORDER AND INTO NRN GA. THESE STORMS WILL LIKELY PERSIST FOR SEVERAL HOURS WHILE MOVING SEWD AHEAD OF FRONT. MEANWHILE...SOME ADDITIONAL DEVELOPMENT IS POSSIBLE ALONG / AHEAD OF FRONT AS BOUNDARY MOVES ACROSS THE APPALACHIANS INTO THE CAROLINAS... ALTHOUGH STRONGEST UPPER SUPPORT WILL REMAIN N OF THE REGION AND MOVE INTO THE ATLANTIC. ALTHOUGH SURFACE FLOW WILL BECOME INCREASINGLY SWLY AHEAD OF FRONT...DEEP-LAYER FLOW WILL REMAIN STRONG THROUGH THE NIGHT WITH 40 TO 60 KT WLY FLOW AT 700 MB AND 50 TO 70 KTS AT MID-LEVELS. AS A RESULT...ONGOING STORMS IN THE TN VALLEY AND ANY NEW DEVELOPMENT AHEAD OF COLD FRONT EAST OF THE APPALACHIANS WILL LIKELY BECOME SEVERE...WITH A THREAT FOR PRIMARILY LARGE HAIL AND DAMAGING WINDS...AND PERHAPS A COUPLE OF TORNADOES. ...LOWER MS VALLEY REGION INTO CENTRAL AND NERN TX... THUNDERSTORM OVER CENTRAL TX HAS WEAKENED OVER THE PAST HALF HOUR...BUT ISOLATED DEVELOPMENT IS POSSIBLE INVOF SURFACE BOUNDARY FROM CENTRAL AND NERN TX EWD INTO SRN AR / NRN LA / NRN MS. ALTHOUGH LOW-LEVEL FLOW IS WEAKER ACROSS THIS REGION...SUFFICIENT FLOW ALOFT SUGGESTS THAT A THREAT FOR PRIMARILY SEVERE HAIL WILL EXIST WITH ANY ADDITIONAL STORMS. ..GOSS.. 04/28/02