THE NATIONAL WEATHER SERVICE HAS EXTENDED TORNADO WATCH 90 TO
INCLUDE THE FOLLOWING AREAS UNTIL 10 PM EDT THIS EVENING
IN PENNSYLVANIA THIS WATCH INCLUDES 12 COUNTIES
IN CENTRAL PENNSYLVANIA
CAMERON CENTRE CLEARFIELD
CLINTON COLUMBIA ELK
LYCOMING MONTOUR NORTHUMBERLAND
SCHUYLKILL SNYDER UNION
THIS INCLUDES THE CITIES OF…BERWICK…BLOOMSBURG…CLEARFIELD…
ST. MARYS…STATE COLLEGE…SUNBURY AND WILLIAMSPORT.
A tornado watch (code: WT; sometimes referred to as a “red box” by meteorologists and storm chasers) is issued when weather conditions are favorable for the development of severe thunderstorms that are capable of producing tornadoes. A tornado watch therefore implies that it is also a severe thunderstorm watch. A tornado watch must not be confused with a tornado warning. In most cases, the potential exists for large hail and/or damaging winds in addition to tornadoes.
A watch does not mean that the severe weather is actually occurring, only that atmospheric conditions have created a significant risk for it. If severe weather actually does occur, a tornado warning or severe thunderstorm warning would then be issued. Note that a watch is not required for a warning to be issued; tornado warnings are occasionally issued when a tornado watch is not active (i.e. when a severe thunderstorm watch is active, or when no watches are in effect), if a severe thunderstorm develops and has a confirmed tornado or strong rotation.