

950 

WWUS20 KWNS 242129

SEL4

SPC WW 242129

OHZ000-PAZ000-WVZ000-LEZ000-250300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 564

NWS STORM PREDICTION CENTER NORMAN OK

425 PM EST WED DEC 24 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN OHIO

  WESTERN PENNSYLVANIA

  WESTERN AND NORTHERN WEST VIRGINIA

  LAKE ERIE



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 425 PM

  UNTIL 1000 PM EST.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH

SOUTHWEST OF ATHENS OHIO TO 55 MILES NORTH NORTHWEST OF

YOUNGSTOWN OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...NARROW...LOW-TOPPED LINE OF CONVECTION/STORMS NOW

FORMING ALONG INTENSIFYING COLD FRONT IN WRN OH EXPECTED TO

STRENGTHEN AS THE FRONT ACCELERATES ENE BENEATH INTENSIFYING SSWLY

LOW-TO MID-TROPOSPHERIC FLOW/ASCENT AHEAD OF IND SHORTWAVE TROUGH.

BUOYANCY WILL REMAIN MODEST...BUT ADEQUATE FOR SUSTAINED UPDRAFTS

GIVEN FOCUSED NATURE OF UPLIFT ALONG FRONT. BUOYANCY ALSO WILL BE

SOMEWHAT AUGMENTED BY DOWNSLOPE-INDUCED LOW-LVL WARM POCKET IN WRN

WV/ERN OH. SPORADIC LOCALLY DMGG SFC GUSTS APPEAR POSSIBLE AS SFC

PRESSURE RISE-FALL COUPLET FURTHER TIGHTENS WITH STRENGTHENING OF

FRONT.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 250. MEAN STORM

MOTION VECTOR 21050.





...CORFIDI



259 

WWUS20 KWNS 242129

SEL4

SPC WW 242129

OHZ000-PAZ000-WVZ000-LEZ000-250300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 564

NWS STORM PREDICTION CENTER NORMAN OK

425 PM EST WED DEC 24 2014



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  CENTRAL AND EASTERN OHIO

  WESTERN PENNSYLVANIA

  WESTERN AND NORTHERN WEST VIRGINIA

  LAKE ERIE



* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 425 PM

  UNTIL 1000 PM EST.



* PRIMARY THREATS INCLUDE...

  SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65

STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH

SOUTHWEST OF ATHENS OHIO TO 55 MILES NORTH NORTHWEST OF

YOUNGSTOWN OHIO.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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...NARROW...LOW-TOPPED LINE OF CONVECTION/STORMS NOW

FORMING ALONG INTENSIFYING COLD FRONT IN WRN OH EXPECTED TO

STRENGTHEN AS THE FRONT ACCELERATES ENE BENEATH INTENSIFYING SSWLY

LOW-TO MID-TROPOSPHERIC FLOW/ASCENT AHEAD OF IND SHORTWAVE TROUGH.

BUOYANCY WILL REMAIN MODEST...BUT ADEQUATE FOR SUSTAINED UPDRAFTS

GIVEN FOCUSED NATURE OF UPLIFT ALONG FRONT. BUOYANCY ALSO WILL BE

SOMEWHAT AUGMENTED BY DOWNSLOPE-INDUCED LOW-LVL WARM POCKET IN WRN

WV/ERN OH. SPORADIC LOCALLY DMGG SFC GUSTS APPEAR POSSIBLE AS SFC

PRESSURE RISE-FALL COUPLET FURTHER TIGHTENS WITH STRENGTHENING OF

FRONT.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 250. MEAN STORM

MOTION VECTOR 21050.





...CORFIDI

