CENTRAL STATES WEATHER UPDATE: Severe Risk Upgraded To Moderate

PUBLIC SEVERE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
0739 AM CDT WED JUL 18 2007

...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE MIDWEST THIS AFTERNOON AND TONIGHT...

THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE DEVELOPMENT OF WIDESPREAD DAMAGING WINDS AND LARGE HAIL OVER PARTS OF THE MIDWEST THIS AFTERNOON AND TONIGHT.

THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE MUCH OF IOWA- NORTHERN ILLINOIS- NORTHEAST NEBRASKA- SOUTHEAST SOUTH DAKOTA

SURROUNDING THE MODERATE RISK AREA- THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FROM SOUTHEAST MONTANA- ACROSS THE MID MISSISSIPPI VALLEY- INTO PARTS OF OHIO AND KENTUCKY.A VERY MOIST AND EXTREMELY UNSTABLE AIR MASS IS FORECAST TO DEVELOP THIS AFTERNOON ALONG AND SOUTH OF A SURFACE BOUNDARY EXTENDING FROM PARTS OF SOUTH DAKOTA AND NEBRASKA- ACROSS IOWA AND INTO NORTHERN IL.

AN UPPER LEVEL IMPULSE WILL APPROACH THE AREA FROM THE WEST BY LATE AFTERNOON- LEADING TO THE DEVELOPMENT OF SCATTERED THUNDERSTORMS ALONG THE BOUNDARY. FAVORABLE WIND FIELDS ALOFT- EXTREME INSTABILITY- AND APPROACHING UPPER SYSTEM WILL PROMOTE THE DEVELOPMENT OF ONE OR MORE LARGE CLUSTERS OF SEVERE THUNDERSTORMS.

THESE CLUSTERS WILL MOVE RAPIDLY EASTWARD ALONG THE BOUNDARY WITH A RISK OF WIDESPREAD DAMAGING WINDS AND LARGE HAIL.

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.

..HART.. 07/18/2007

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