SPC AC 201620
   
   DAY 1 CONVECTIVE OUTLOOK  
   NWS STORM PREDICTION CENTER NORMAN OK
   1120 AM CDT TUE APR 20 2004
   
   VALID 201630Z - 211200Z
   
   THERE IS A SLGT RISK OF SVR TSTMS TO THE RIGHT OF A LINE FROM SPI
   SLO CGI JBR HOT PRX 40 SSE SPS OKC ICT 15 ESE TOP 35 NE FNB OMA 35 W
   OFK 35 WNW YKN OTG MCW 40 N OTM BRL SPI.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 20 NW JHW 15 SSW AOO
   15 NE WAL.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 25 N UIL 35 SSW CLM
   35 ESE AST 15 SW EUG 4BK.
   
   GEN TSTMS ARE FCST TO THE RIGHT OF A LINE FROM 15 ENE ECG 15 W RWI
   40 ENE HKY 50 SE LOZ 15 WSW CKV 50 NE PBF 20 NW SHV 20 WSW CLL 55 E
   JCT 30 NE JCT 20 SW BWD 25 NE FSI 45 SSW RSL 15 NE AIA 45 SSE CPR 45
   E CAG 30 ENE U24 50 WNW ELY 20 SW BAM 75 SSE BNO 10 SSW ALW 30 SE
   GEG 20 SSE FCA 40 SW OLF 40 ESE SDY 65 S FAR 70 SSW DLH 25 S CMX.
   
   ...THERE IS A SLGT RISK OF SVR TSTMS ACROSS PARTS OF THE
   CENTRAL/SOUTHERN PLAINS AND MID MS VALLEY...
   
   ...KS/OK/MO/AR...
   WATER VAPOR IMAGERY SHOWS FAST-MOVING SHORTWAVE TROUGH OVER NM. 
   THIS FEATURES WILL TRACK EASTWARD INTO CENTRAL/EASTERN OK BY 21/00Z.
    MEANWHILE...SURFACE BOUNDARY CLEARLY SHOWN ON VISIBLE SATELLITE
   IMAGERY OVER CENTRAL KS IS EXPECTED TO MOVE SLOWLY SOUTHEASTWARD AND
   STALL ROUGHLY ALONG AN AXIS FROM ICT TO SOUTH OF MCI.  AIRMASS ALONG
   AND SOUTH OF BOUNDARY WILL BECOME MODERATELY UNSTABLE AS LOW CLOUDS
   BURN OFF...WITH SURFACE DEWPOINTS NEAR 60F AND MLCAPE VALUES AROUND
   1500 J/KG.  THIS BOUNDARY...ALONG WITH DRYLINE LIKELY TO MIX
   EASTWARD ROUGHLY TO THE I-35 CORRIDOR SHOULD SERVE AS THE FOCUSING
   MECHANISMS FOR INITIAL CONVECTIVE INITIATION THIS AFTERNOON. 
   VERTICAL SHEAR PROFILES ARE FORECAST TO STRENGTHEN THROUGH THE DAY
   WITH FAVORABLE 6KM SHEAR AND LOW LEVEL HELICITY VALUES FOR
   SUPERCELLS.  STRONGER CELLS WILL LIKELY HAVE A RISK OF LARGE HAIL
   AND ISOLATED TORNADOES.  STORMS MAY ORGANIZE INTO ONE OR MORE MCSS
   AND TRACK EASTWARD ACROSS NORTHERN AR AND CENTRAL/SOUTHERN MO. 
   LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN RISKS WITH THIS
   ACTIVITY.
   
   ...NEB/SD/IA...
   SYNOPTIC SURFACE LOW CURRENTLY OVER EASTERN NEB WILL REMAIN NEARLY
   STATIONARY TODAY...WITH STRONG HEATING ACROSS MUCH OF THIS AREA. 
   RESIDUAL LOW LEVEL MOISTURE EAST AND NORTH OF LOW WILL CONTRIBUTE TO
   MODERATE AFTERNOON INSTABILITY WITH MUCAPE VALUES OF 1000-2000 J/KG.
    WEAK CAP AND CONVERGENCE NEAR LOW/BOUNDARIES WILL LIKELY RESULT IN
   SCATTERED THUNDERSTORM DEVELOPMENT.  COLD TEMPERATURES ALOFT AND
   STEEP LAPSE RATES WILL PROMOTE A RISK OF LARGE HAIL IN STRONGER
   CELLS.
   
   ...OH VALLEY...
   BAND OF SHOWERS/THUNDERSTORMS EXTENDING FROM IL/IND INTO TN WILL
   CONTINUE TO SPREAD NORTHEASTWARD ACROSS THE OH VALLEY TODAY. 
   POCKETS OF DAYTIME HEATING AND INCREASING SOUTHERLY LOW LEVEL WINDS
   MAY RESULT IN ISOLATED STRONG STORMS CAPABLE OF GUSTY WINDS OR HAIL.
    PRESENT INDICATIONS ARE THAT LACK OF SUFFICIENT INSTABILITY WILL
   LESSEN THE RISK OF ORGANIZED SEVERE STORMS.
   
   ..HART/BANACOS.. 04/20/2004
   
   ...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 2000Z