ZCZC SPCPWOSPC ALL WOUS40 KWNS 101729 TXZ000-OKZ000-ARZ000-TNZ000-KSZ000-MOZ000-IAZ000-ILZ000-INZ000- OHZ000-VAZ000-WVZ000-NCZ000-KYZ000-110000- PUBLIC SEVERE WEATHER OUTLOOK STORM PREDICTION CENTER NORMAN OK 1215 PM CST SAT 10 MAY 03 THE STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING AN OUTBREAK OF SEVERE THUNDERSTORMS ACROSS OK/TX EASTWARD ACROSS THE MIDDLE/LOWER MS AND OH VALLEY REGIONS EWD TO THE MID ATLANTIC STATES THIS AFTERNOON AND EVENING. WITHIN THIS AREA...THE AREAS MOST LIKELY TO EXPERIENCE A SIGNIFICANT TORNADOES INCLUDE: EASTERN OKLAHOMA NORTHWESTERN ARKANSAS EXTREME SOUTHEASTERN KANSAS MISSOURI SOUTHEASTERN IOWA ILLINOIS CENTRAL/SOUTHERN INDIANA SOUTHERN OHIO KENTUCKY A SURFACE LOW PRESSURE LOCATED IN EXTREME NORTHEAST KANSAS WILL MOVE RAPIDLY NEWD INTO SOUTHWESTERN WISCONSIN TONIGHT. THIS LOW WILL PUSH A DRYLINE EWD RAPIDLY EASTWARD FROM THE CENTRAL/SOUTHERN PLAINS INTO THE MIDDLE MS VALLEY REGION LATER TODAY. AT THE SAME TIME...A POWERFUL JET STREAM WILL ALSO LIFT NEWD INTO THE AREA. GIVEN THESE FEATURES AND A VERY UNSTABLE AIR MASS AHEAD OF THE DRYLINE...THE ENVIRONMENT IS PRIMED FOR POSSIBLY A SIGNIFICANT TORNADO OUTBREAK FROM EASTERN OKLAHOMA/EXTREME SOUTHEASTERN KANSAS NORTHEASTWARD INTO THE MIDDLE MISSISSIPPI RIVER VALLEY THIS AFTERNOON AND EVENING. VERY LARGE HAIL AND DAMAGING WIND ARE ALSO EXPECTED WITH THIS STORMS. TORNADOES ARE ALSO LIKELY ACROSS PORTIONS OF INDIANA...OHIO AND KENTUCKY AS AN UPPER LEVEL TROUGH MOVES EASTWARD THROUGH AN UNSTABLE AIR MASS WITH FAVORABLE WIND SHEAR. ALSO...WIDESPREAD DAMAGING WINDS ARE ALSO POSSIBLE LATER TODAY AS THE STORMS ARE EXPECTED TO EVOLVE INTO A LONG SQUALL FROM TEXAS NORTHEASTWARD INTO MO/IL AND THEN MOVES EASTWARD OVERNIGHT. THIS IS POTENTIALLY A VERY DANGEROUS SITUATION. THOSE IN THE THREATENED AREA ARE URGED TO REVIEW SEVERE WEATHER SAFETY RULES AND TO LISTEN TO RADIO AND TELEVISION AND NOAA WEATHER RADIO FOR POSSIBLE WATCHES...WARNINGS AND STATEMENTS LATER TODAY. DAVID IMY STORM PREDICTION CENTER