PUBLIC SEVERE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK 0440 AM CDT THU JUN 07 2007
...HIGH RISK OF SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE UPPER MISSISSIPPI RIVER VALLEY AND THE WESTERN GREAT LAKES LATER TODAY AND TONIGHT...
THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE DEVELOPMENT OF STRONG TORNADOES ALONG WITH WIDESPREAD DAMAGING WINDS AND LARGE HAIL OVER PARTS OF THE UPPER MISSISSIPPI RIVER VALLEY AND THE GREAT LAKES LATER TODAY AND TONIGHT.
THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE EASTERN IOWA- NORTHERN ILLINOIS- UPPER PENINSULA OF MICHIGAN- EASTERN MINNESOTA- WISCONSIN.
SURROUNDING THE HIGH RISK AREA- THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS FROM PARTS OF THE UPPER AND MIDDLE MISSISSIPPI RIVER VALLEY INTO THE CENTRAL GREAT LAKES.
AN UNSEASONABLY STRONG WEATHER SYSTEM CONTINUES TO EJECT OUT OF THE ROCKIES AND ACROSS THE NORTHERN AND CENTRAL PLAINS TODAY- WITH ASSOCIATED SURFACE LOW PRESSURE SYSTEM LIFTING ACROSS NORTHERN MINNESOTA.
IN RESPONSE...VERY STRONG LOW LEVEL AND UPPER LEVEL WINDS WILL OVERSPREAD A LARGE PART OF THE MIDDLE U.S. AND SUPPORT EXTREMELY STRONG WIND SHEAR FOR THIS TIME OF YEAR.
THIS WILL SET THE STAGE FOR A POSSIBLE OUTBREAK OF SEVERE THUNDERSTORMS- INCLUDING TORNADOES...THIS AFTERNOON AND TONIGHT.
STRONG AND DAMAGING TORNADOES ALONG WITH WIDESPREAD WIND DAMAGE ARE EXPECTED IN THIS REGION.
AS HEATING AND SURFACE MOISTURE INCREASE THROUGH THE MORNING AND EARLY AFTERNOON- THE ATMOSPHERE WILL BECOME MORE SUPPORTIVE OF THUNDERSTORMS DEVELOPING OVER PORTIONS OF CENTRAL MINNESOTA.
SEVERE
THUNDERSTORMS WILL BECOME MORE WIDESPREAD AND INTENSIFY QUICKLY THROUGH THE DAY ACROSS MUCH OF THE UPPER MISSISSIPPI RIVER VALLEY- WITH DEVELOPMENT OCCURRING SOUTH-SOUTHWESTWARD ALONG A SURFACE COLD FRONT ACROSS EASTERN IOWA AND POSSIBLY NORTHEASTERN MISSOURI BY LATE IN THE DAY.
EXTREME SHEAR WILL SUPPORT SUPERCELLS AND FAST MOVING LINES OF THUNDERSTORMS ACROSS THIS REGION- WITH POTENTIAL FOR AN OUTBREAK OF TORNADOES AND DAMAGING WINDS AS STORMS RACE EAST-NORTHEASTWARD THROUGH THE EVENING INTO THE GREAT LAKES. LARGE HAIL WILL ALSO BE COMMON WITH THESE STORMS.
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- TELEVISION- AND NOAA WEATHER RADIO FOR POSSIBLE WATCHES- WARNINGS- AND STATEMENTS LATER TODAY.
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