

724 

WWUS20 KWNS 221714

SEL0

SPC WW 221714

INZ000-MIZ000-OHZ000-LEZ000-230000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 670

NWS STORM PREDICTION CENTER NORMAN OK

115 PM EDT FRI JUL 22 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHEAST INDIANA

       SOUTHEAST MICHIGAN

       NORTHERN AND WESTERN OHIO

       LAKE ERIE



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 115 PM UNTIL 800

PM EDT.



HAIL TO 1.5 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 75

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES SOUTHEAST OF

MANSFIELD OHIO TO 25 MILES SOUTH SOUTHWEST OF SOUTH BEND INDIANA.

 FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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...COLD POOL ASSOCIATED WITH WEAK MCS...AS WELL AND

CONVECTIVE TEMPERATURES NOW BEING BREACHED IN VERY HOT AND UNSTABLE

AIR MASS WILL CONTRIBUTE TO MORE ROBUST THUNDERSTORM DEVELOPMENT

THROUGH THE AFTERNOON ACROSS THESE AREAS. GIVEN GENERALLY WEAK MID

LEVEL FLOW...MOST ACTIVITY IS EXPECTED TO BE PULSE OR WEAKLY

ORGANIZED MULTICELLULAR IN NATURE. HOWEVER...STORM COVERAGE AND VERY

UNSTABLE CONDITIONS WILL SUPPORT THE POTENTIAL FOR NUMEROUS

DOWNBURST WIND EVENTS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 26025.





...CARBIN

