Apr- 7-2005 0100 UTC Day 1 Convective Outlook Updated: Thu Apr 7 01:00:20 UTC 2005
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SPC AC 070056 DAY 1 CONVECTIVE OUTLOOK NWS STORM PREDICTION CENTER NORMAN OK 0756 PM CDT WED APR 06 2005 VALID 070100Z - 071200Z THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM 30 SW GPT 30 E MCB 25 ENE GLH 45 SW MEM 40 NNE MEM 40 NNE MKL 20 WSW BNA 50 WNW CHA 10 NNW ATL 25 NE ABY 25 WNW CTY. GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 SW HUM 20 SE BTR 25 SW HEZ 15 NW POE 20 E TYR 50 E OKC 35 S EMP 10 SE FNB 40 W ALO 40 E AUW ANJ ...CONT... 25 NW PBG 20 WSW BTV 20 N ALB 35 NW MSV 35 ENE BFD CLE 30 ENE DAY 20 ESE LEX 20 E HSS 10 ESE AGS 20 ENE AYS 25 SSE CTY. ...THERE IS A SLGT RISK OF SVR TSTMS FROM PARTS OF THE LOWER MS AND TN VALLEYS INTO THE SERN STATES... ...MS...AL...GA...TN...NWRN FL... UPPER LOW CENTERED OVER NW AR WILL CONTINUE SLOWLY EWD OVERNIGHT. A STRONG VORTICITY MAX/JET STREAK IS CURRENTLY ROTATING THROUGH THE BASE OF THIS UPPER LOW. THIS FEATURE WILL EJECT EWD THROUGH THE LOWER MS VALLEY AND INTO THE SWRN PARTS OF THE SERN STATES. DOWNSTREAM FROM THE UPPER LOW A STRONG SLY LOW LEVEL JET WILL PERSIST...INITIALLY FROM ERN MS...WRN AL...WRN AND MIDDLE TN THEN SLOWLY SHIFTING EWD THROUGH THE REMAINDER OF TN...AL AND INTO GA OVERNIGHT. AN OCCLUDED FRONT EXTENDS FROM A SURFACE LOW IN NRN AR SWD THROUGH WRN MS THEN INTO SERN LA WHERE IT BECOMES A COLD FRONT. A WARM FRONT EXTENDS FROM NRN AL WWD THROUGH NWRN MS WHERE IT INTERSECTS THE OCCLUDED BOUNDARY. PARTIALLY MODIFIED GULF AIR WITH SURFACE DEWPOINTS IN THE LOW 60S HAS SPREAD NWD THROUGH WARM SECTOR INTO CNTRL/SRN AL AND CNTRL/SRN MS. THE BEST INSTABILITY HAS BEEN CONFINED TO AN AXIS JUST AHEAD OF THE COLD FRONT FROM EXTREME SERN LA THROUGH SRN AND CNTRL MS WHERE MLCAPE RANGES FROM 800 TO 1200 J/KG. THE STABILIZING EFFECTS OF A LARGE MCS THAT EXTENDS THROUGH MUCH OF AL INTO THE WRN FL PANHANDLE HAS RESULTED IN WEAKER INSTABILITY IN THIS REGION...WITH MUCAPE GENERALLY AOB 500 J/KG. SCATTERED STORMS ARE EXPECTED TO CONTINUE DEVELOPING WITHIN ZONE OF ASCENT IN WARM SECTOR ALONG LOW LEVEL JET FROM ERN MS INTO AL AND TN...GRADUALLY SPREADING EWD OVERNIGHT. STRONGEST STORMS...WITH POTENTIAL OF ISOLATED DAMAGING WIND...HAIL AND ISOLATED TORNADOES... ARE EXPECTED FROM ERN MS INTO PARTS OF AL AND THE FL PANHANDLE. STRONG FLOW AND VERTICAL SHEAR PROFILES WILL GRADUALLY SHIFT EAST INTO ERN TN AND GA OVERNIGHT. HOWEVER...THE STABILIZING EFFECTS OF THE LEAD MCS WILL LIKELY LIMIT DEGREE OF RECOVERY WITH INSTABILITY EXPECTED TO REMAIN VERY MARGINAL. ...NERN AR... STORMS DEVELOPING IN VICINITY OF THE OCCLUDED FRONT AND E OF SURFACE LOW MAY REMAIN CAPABLE OF PRODUCING ISOLATED HAIL AND POSSIBLY AN ISOLATED TORNADO OR TWO NEXT COUPLE HOURS. HOWEVER...THIS ACTIVITY IS EXPECTED TO WEAKEN AFTER 02Z AS THE BOUNDARY LAYER BEGINS TO STABILIZE. ..DIAL.. 04/07/2005 ...NOTICE... THE STATION RELATIVE POINTS IN THIS PRODUCT ARE NOW AVAILABLE SEPARATELY UNDER THE WMO HEADINGS WUUS01 PTSDY1... WUUS02 PTSDY2...WUUS03 PTSDY3. THE INCLUSION OF POINTS IN THIS DISCUSSION WILL BE DISCONTINUED AFTER THE 2005 CONVECTIVE SEASON. A PUBLIC NOTIFICATION STATEMENT (PNS) WILL PROVIDE DETAILS ON THE TRANSITION. CLICK TO GET WUUS01 PTSDY1 PRODUCT NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED BY 0600Z |