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WWUS20 KWNS 162102

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SPC WW 162102

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 669

NWS STORM PREDICTION CENTER NORMAN OK

505 PM EDT THU SEP 16 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST OHIO

       FAR NORTHWEST WEST VIRGINIA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 505 PM UNTIL

900 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 35

STATUTE MILES EITHER SIDE OF A LINE FROM 30 MILES NORTH NORTHWEST

OF WHEELING WEST VIRGINIA TO 15 MILES SOUTHEAST OF ATHENS OHIO.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 668...



DISCUSSION...SEVERE TSTMS /INCLUDING SUPERCELLS/ ONGOING OVER CNTRL

OH ARE EXPECTED TO MOVE/DEVELOP EWD INTO ERN OH THIS EVENING.  A

NARROW THERMAL/MOISTURE AXIS IS BEING MAINTAINED AHEAD OF THESE

STORMS...AND GIVEN THE STRENGTHENING VERTICAL SHEAR /BASED ON ILN

VWP/...ENVIRONMENT WILL REMAIN SUPPORTIVE OF ORGANIZED STORM MODES

WITH THE THREAT FOR MAINLY HAIL AND DAMAGING WINDS.  STORMS SHOULD

TEND TO WEAKEN LATER THIS EVENING AS STORMS EVENTUALLY MOVE E OF THE

INSTABILITY AXIS.



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 28035.





...MEAD

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