[LeArc] Weather Watch : 0@ 7/18/2003 3:46:09 PM

[learc@mailman.qth.net]

The following weather message is provided by McDonough County E.S.D.A.


WWUS20 KWNS 182044
SEL0  
SPC WW 182045
ILZ000-MOZ000-190200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 760 
NWS STORM PREDICTION CENTER NORMAN OK 
345 PM CDT FRI JUL 18 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       EXTREME WESTERN ILLINOIS
       EASTERN MISSOURI

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 345 PM UNTIL 900
PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 55
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 50 STATUTE MILES
EAST AND WEST OF A LINE FROM 75 MILES NORTHWEST OF SAINT LOUIS
MISSOURI TO 30 MILES SOUTHEAST OF POPLAR BLUFF MISSOURI.

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.


OTHER WATCH INFORMATION...CONTINUE...WW 759...


DISCUSSION...ELEVATED THUNDERSTORMS HAVE INTENSIFIED OVER ERN MO
EAST OF OUTFLOW BOUNDARY GENERATED BY EARLIER CONVECTION.  WLY/WNWLY
FEED OF UNSTABLE AIR ALOFT COUPLED WITH MODERATE NWLY FLOW IN THE
MID LEVELS WILL MAINTAIN CONTINUED DEVELOPMENT OF NEW STORMS.  LARGE
HAIL WILL BE THE PRIMARY THREAT...ALTHOUGH DAMAGING WINDS WILL
BECOME POSSIBLE IF STORMS CAN BECOME ROOTED IN THE BOUNDARY LAYER.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 31030.


...WEISS

;392,0902 362,0891 362,0905 392,0921; 
WWWW