DAY1SVR: Public Severe Weather Outlook (Automatic)

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PUBLIC SEVERE WEATHER OUTLOOK
NWS STORM PREDICTION CENTER NORMAN OK
1125 AM CDT SUN JUN 20 2010

...SEVERE THUNDERSTORMS EXPECTED OVER PARTS OF THE CENTRAL AND
NORTHERN PLAINS...AND OVER THE LOWER MISSOURI AND MID MISSISSIPPI
VALLEYS...THIS AFTERNOON THROUGH EARLY MONDAY...

THE NWS STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE
DEVELOPMENT OF TORNADOES...LARGE HAIL...AND DAMAGING WINDS OVER A
SIZABLE PORTION OF THE NORTH CENTRAL STATES LATER TODAY THROUGH
EARLY MONDAY.

THE AREAS MOST LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE

FAR NORTHERN MISSOURI
EXTREME SOUTHEASTERN MONTANA
MUCH OF NEBRASKA
SOUTHERN AND WESTERN SOUTH DAKOTA
EASTERN WYOMING

SURROUNDING THE AREA OF GREATEST RISK...SEVERE STORMS ARE ALSO
POSSIBLE FROM THE NORTHERN ROCKIES THROUGH THE NORTHERN HALF OF THE
PLAINS INTO THE LOWER OHIO VALLEY.

THE WEATHER PATTERN THAT HAS FOSTERED THE DEVELOPMENT OF NUMEROUS
CLUSTERS OF SEVERE THUNDERSTORMS OVER THE CENTRAL UNITED STATES IN
RECENT DAYS WILL PERSIST ACROSS THE REGION THROUGH MONDAY.

THIS PATTERN FEATURES A BAND OF SEASONABLY STRONG JET STREAM WINDS
EXTENDING FROM THE CENTRAL ROCKIES ACROSS THE CENTRAL PLAINS INTO
THE MID MISSISSIPPI AND LOWER OHIO VALLEYS. A DISTURBANCE IN THE
JET STREAM FLOW...NOW OVER UTAH...WILL REACH NEBRASKA AND SOUTH
DAKOTA THIS EVENING...BEFORE TURNING EAST INTO THE UPPER MISSISSIPPI
VALLEY EARLY MONDAY.

ASCENT WITH THE UPPER DISTURBANCE...AND THE CONTINUING PRESENCE OF
VERY WARM AND HUMID AIR ALONG THE SOUTHERN FRINGE OF THE JET
STREAM...LIKELY WILL SUPPORT THE DEVELOPMENT OF SEVERAL WAVES OF
STRONG TO SEVERE STORMS FROM THE CENTRAL AND NORTHERN HIGH PLAINS
EAST-SOUTHEAST INTO THE MID MISSISSIPPI VALLEY.

STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE ANYWHERE ACROSS THIS
REGION BETWEEN NOW AND MONDAY MORNING. HOWEVER...THE MOST INTENSE
STORMS...WITH THE POTENTIAL FOR TORNADOES...VERY LARGE HAIL...AND
DAMAGING WIND...SHOULD FORM OVER NEBRASKA AND SOUTHERN SOUTH DAKOTA
THIS AFTERNOON. THE STORMS LIKELY WILL MERGE INTO ONE OR MORE
LARGE...LONG-LASTING CLUSTERS THAT SUBSEQUENTLY MOVE EAST-SOUTHEAST
INTO IOWA...NORTHERN MISSOURI...AND ILLINOIS. THESE CLUSTERS WILL
POSE A CONTINUED RISK FOR DAMAGING WIND...HAIL...AND ISOLATED
TORNADOES TONIGHT THROUGH EARLY MONDAY.

STATE AND LOCAL EMERGENCY MANAGERS ARE MONITORING THIS DEVELOPING
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.

..CORFIDI/DIAL.. 06/20/2010

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