THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A...

* FREEZE WATCH

FOR THE FOLLOWING COUNTIES IN SOUTHWESTERN PENNSYLVANIA AND NORTHERN WEST VIRGINIA...

* WASHINGTON, ALLEGHENY, WESTMORELAND, GREENE AND MONGALHIA

* THIS FREEZE WATCH IF IN EFFECT THURSDAY NIGHT THROUGH FRIDAY MORNING

A FREEZE WATCH MEANS THAT TEMPERATURES ARE EXPECTED TO BE BELOW 32 DEGREES FOR THE DURATION OF THIS WATCH.  THESE COLD CONDITIONS CAN KILL CROPS AND OTHER SUBSTANSIAL VEGETATION.  PERSONS IN THESE AREAS SHOULD TAKE ALL POSSIBLE PRECAUTIONS TO PROTECT THEIR CROPS AND VEGETATION.

DISCUSSION.... A COLD FRONT IS EXPECTED TO PASS THROUGH THE AREA TONIGHT, BRINGING SHOWERS AND THUNDERSTORMS WITH IT.  BEHIND THIS FRONT, WE EXPECT ANOTHER FRONT, A POLAR FRONT TO CROSS THE AREA.  THIS FRONT WILL USHER IN BELOW NORMAL TEMPERATURES FOR THIS TIME OF THE YEAR.  LOWS WILL BE IN THE LOWER 30'S TO POSSIBLY IN THE UPPER 20'S, AND DAYTIME HIGHS ONLY IN THE LOW TO MID 50'S.