PUBLIC SEVERE WEATHER OUT LOOK STORM PREDICTION CENTER NORMAN OK
12 NOON CDT SAT JUNE 5 1999 ...
OUTBREAK OF SEVERE THUNDERSTORMS INCLUDING A FEW STRONG TORNADOES EXPECTED OVER PARTS OF
THE NORTHERN AND CENTRAL PLAINS AND UPPER MISSISSIPPI VALLEY LATE THIS AFTERNOON AND
TONIGHT... THE STORM PREDICTION CENTER IN NORMAN OK IS FORECASTING THE DEVELOPMENT OF
SEVERE THUNDERSTORMS WITH A FEW STRONG TORNADOES... LARGE HAIL AND DAMAGING WINDS OVER
PARTS OF THE NORTHERN AND CENTRAL PLAINS LATE THIS AFTERNOON AND TONIGHT. THE AREAS MOST
LIKELY TO EXPERIENCE THIS ACTIVITY INCLUDE:
CENTRAL AND EASTERN NEBRASKA SOUTH CENTRAL AND
EASTERN SOUTH DAKOTA SOUTHWEST MINNESOTA WEST IOWA
LOW PRESSURE OVER WEST CENTRAL NEBRASKA WILL DEEPEN THIS AFTERNOON AS AN UNSEASONABLY
STRONG UPPER AIR DISTURBANCE OVER THE SOUTHERN PLATEAU LIFTS NORTHEASTWARD ACROSS THE
CENTRAL PLAINS. AS THE LOW MOVES INTO SOUTH DAKOTA TONIGHT A WARM FRONT WILL LIFT
NORTHWARD ACROSS THE UPPER MISSISSIPPI VALLEY AND A COLD FRONT/DRY LINE WILL ADVANCE
EASTWARD OVER THE CENTRAL AND SOUTHERN PLAINS. IN ADDITION...A SURFACE BOUNDARY GENERATED
BY EARLY MORNING THUNDERSTORMS OVER THE NORTHERN PLAINS MAY PROVIDE ANOTHER FOCUS FOR
THUNDERSTORM DEVELOPMENT THIS AFTERNOON. STRONG SOUTHERLY WINDS OVER THE PLAINS STATES
WILL ALLOW WARM HUMID AIR TO RETURN INTO PARTS OF NEBRASKA...SOUTH DAKOTA...AND SOUTHERN
MINNESOTA TODAY.
THIS WILL CONTRIBUTE TO THE FORMATION OF A VERY UNSTABLE AIR MASS AND INCREASE THE
LIKELIHOOD OF SEVERE THUNDERSTORMS. THE STORMS ARE EXPECTED TO DEVELOP RAPIDLY DURING THE
LATE AFTERNOON AND EVENING HOURS OVER NEBRASKA AND SOUTH DAKOTA...THEN SPREAD EASTWARD AND
NORTHEASTWARD INTO PARTS OF MINNESOTA AND IOWA TONIGHT. AS A VERY STRONG UPPER LEVEL JET
STREAM MOVES NORTHEASTWARD INTO THE CENTRAL AND NORTHERN PLAINS THE VERTICAL WIND PROFILES
WILL BECOME INCREASINGLY FAVORABLE FOR SEVERE THUNDERSTORMS...INCLUDING THE POSSIBILITY OF
STRONG TORNADOES.
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 SEVERE WEATHER WATCHES...WARNINGS AND STATEMENTS THIS AFTERNOON ANDTONIGHT.
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