SPC AC 140101
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   0801 PM CDT TUE APR 13 2004
   
   VALID 140100Z - 141200Z
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 60 ENE CTB 50 ENE WEY
   25 NNE RIW 25 SW DGW 30 WNW BFF 35 ESE CYS 25 WNW COS 60 ESE ASE 45
   ENE GJT 30 NNE U28 35 SW PUC 40 WNW PUC 15 SSW OGD 65 SSW TWF 30 E
   WMC 20 N RBL 10 NNW ACV ...CONT... OTH 15 NNE SLE 15 NW OLM 30 NE
   UIL.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 30 SSW WAL 40 SW DOV
   10 W BWI 40 SSE MRB 20 SW CHO 25 SSW ROA 35 S BLF 15 S 5I3 20 E HTS
   20 ESE PKB 20 NNW LBE 15 SSW SYR 35 ENE UCA 10 WNW RUT 10 NE PSM.
   
   ...NO SVR TSTM AREAS FORECAST...
   
   ...MID ATLANTIC REGION TO SRN NEW ENGLAND...
   SURFACE LOW CENTERED OVER THE NRN CHESAPEAKE BAY AT 00Z WILL
   CONTINUE TO MOVE NWD INTO SERN NY OVERNIGHT AS THE CLOSED UPPER
   LOW...CURRENTLY OVER ERN TN/KY PER WV IMAGERY...TRACKS ENEWD TO NRN
   VA BY 12Z WEDNESDAY.  COLD MID-LEVEL TEMPERATURES /-21 TO -23C AT
   500 MB/ MAY SUPPORT AN AREA OF ELEVATED THUNDERSTORMS NEWD INTO FAR
   SOUTH CENTRAL PA THROUGH ABOUT 03Z.  OVERALL THUNDERSTORM COVERAGE
   SHOULD...HOWEVER...CONTINUE TO DIMINISH WITH THE LOSS OF DAY TIME
   HEATING AS IS INDICATED PER CURRENT LIGHTNING DATA OVER ERN WV.
   
   STRONG LOW-LEVEL WAA ASSOCIATED WITH LEAD SHORT WAVE TROUGH WILL
   CONTINUE OVER SRN NEW ENGLAND THIS EVENING AND SUPPORT AN ELEVATED
   THREAT FOR THUNDERSTORMS ABOVE A SHALLOW COOL BOUNDARY LAYER. 
   DESPITE MARGINAL ELEVATED INSTABILITY AND STRONG DEEP LAYER
   SHEAR...WEAK LAPSE RATES WILL LIMIT UPDRAFT STRENGTH AND OVERALL
   POTENTIAL FOR SEVERE STORMS.  WARM SECTOR MAY MOVE FARTHER
   INLAND...BUT DRY SLOT CURRENTLY OVER SERN PA/DELMARVA REGION WILL
   MOVE ACROSS SERN NY/SRN NEW ENGLAND BY 02-03Z RESULTING IN A
   DECREASE IN PRECIPITATION.  STRONGEST THUNDERSTORM ACTIVITY IS
   EXPECTED TO REMAIN OFFSHORE OVERNIGHT. 
   
   ...ERN WA/NERN ORE TO WRN MT...
   PACIFIC TROUGH WILL CONTINUE TO MOVE INLAND ACROSS THE PACIFIC NW
   AND GREAT BASIN THIS EVENING/OVERNIGHT.  WIDELY SCATTERED
   THUNDERSTORMS HAVE DEVELOPED AHEAD OF SHORT WAVE TROUGH... CURRENTLY
   MOVING INTO SWRN ID...WHERE SURFACE HEATING HAS RESULTED IN MARGINAL
   INSTABILITY.  THERE IS AN AREA OF MODERATE INSTABILITY OVER CENTRAL
   ID/FAR WEST CENTRAL MT...BUT STRONGER DEEP LAYER SHEAR FOR AN
   ORGANIZED SEVERE THREAT IS LAGGING TO THE WEST.  ALTHOUGH DEEP LAYER
   SHEAR WILL INCREASE OVER ERN WA TO WRN MT OVER THE NEXT SEVERAL
   HOURS...THE INSTABILITY WILL BE WEAKENING WITH THE LOSS OF DAY TIME
   HEATING.  DURING THIS TRANSITION PERIOD...UNTIL AROUND 03Z...THERE
   WILL BE A LOW PROBABILITY FOR AN ISOLATED SEVERE STORM...WITH A
   STRONG AND/OR DAMAGING WIND GUST THE MAIN THREAT...GIVEN THE
   INVERTED-V PROFILES PER AREA 00Z SOUNDINGS.
   
   ...FL...
   NARROW BAND OF SHOWERS EXTENDING FROM EAST CENTRAL TO SWRN FL ATTM
   PER REGIONAL RADARS WILL CONTINUE TO MOVE ESEWD ACROSS THE SRN
   PENINSULA.  THE BEST CHANCE FOR THUNDERSTORMS WILL BE OFFSHORE THE
   EAST COAST...WHERE INSTABILITY AND LOW-LEVEL CONVERGENCE ALONG A
   COLD FRONT WILL BE THE GREATEST.  VEERED FLOW OVER CENTRAL/SRN FL
   AND A STABLE BOUNDARY LAYER SHOULD LIMIT POTENTIAL FOR THUNDERSTORMS
   OVER LAND.
   
   ..PETERS.. 04/14/2004
   
   ...NOTICE...
   FOR USERS DECODING THE POINTS PARAGRAPH HEREIN...LATITUDE AND
   LONGITUDE POINTS FOR THE CATEGORICAL AND PROBABILISTIC OUTLOOK
   GRAPHICS ALSO ARE LOCATED IN A SEPARATE PRODUCT UNDER THE WMO
   HEADINGS WUUS01 PTSDY1...WUUS02 PTSDY2...AND WUUS03 PTSDY3.  THE
   INCLUSION OF POINTS IN THIS PRODUCT WILL EVENTUALLY BE DISCONTINUED.
   
   NOTE: THE NEXT DAY 1 OUTLOOK IS SCHEDULED FOR 0600Z