NOTE: This Severe Thunderstorm Watch extends far enough east to touch the Alabama/Mississippi border (West Central Alabama line) but it does not include any part of Alabama.
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URGENT – IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 194
NWS STORM PREDICTION CENTER NORMAN OK
1030 AM CDT THU MAY 20 2010
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST ARKANSAS
NORTHERN LOUISIANA
CENTRAL MISSISSIPPI
PARTS OF EASTERN TEXAS
EFFECTIVE THIS THURSDAY MORNING AND EVENING FROM 1030 AM UNTIL
700 PM CDT.
HAIL TO 2.5 INCHES IN DIAMETER…THUNDERSTORM WIND GUSTS TO 70
MPH…AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST
SOUTHWEST OF LONGVIEW TEXAS TO 25 MILES NORTHEAST OF MERIDIAN
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
REMEMBER…A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
DISCUSSION…TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND
INTENSITY TODAY ALONG AND AHEAD OF A CONVECTIVE OUTFLOW BOUNDARY
SHIFTING SEWD THROUGH THE REGION. THE AMBIENT INFLOW AIR MASS IS
QUITE MOIST WITH DEW POINTS IN THE LOWER 70S. WHEN COUPLED WITH
COOL MIDLEVEL TEMPERATURES…ENVIRONMENT IS EXPECTED TO BECOME
MODERATELY TO STRONGLY UNSTABLE BY AFTERNOON. THIS INSTABILITY IN
CONJUNCTION WITH 40-45 KT OF DEEP WLY SHEAR WILL SUPPORT THE
DEVELOPMENT OF ORGANIZED SEVERE STORMS INCLUDING SUPERCELLS AND
BOWING LINE SEGMENTS. WHILE A TORNADO IS POSSIBLE…LARGE HAIL AND
DAMAGING WIND GUSTS APPEAR TO BE THE PRIMARY SEVERE WEATHER HAZARDS.
AVIATION…A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27025.
