Tornado Watch 336

Issued

Jun 1, 2012, 6:04 PM EDT (22:04 UTC)

Expired

Jun 1, 2012, 10:59 PM EDT

In force

5 hr

Issued by

the Storm Prediction Center

Largest hail expected

0.5 in

Strongest gust expected

60 kt

Counties Cameron County, PA, Centre County, PA, Clearfield County, PA, Clinton County, PA, Columbia County, PA, Elk County, PA, Lycoming County, PA, McKean County, PA, Montour County, PA, Northumberland County, PA, Potter County, PA, Schuylkill County, PA, Snyder County, PA, Sullivan County, PA, Tioga County, PA, Union County, PA

The State College radar (KCCX), 62 km from the middle of the area, began a volume at 22:04 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

10%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

5%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1013Jun 1, 5:46 PM EDT

287 
WWUS20 KWNS 012207
SEL6
SPC WW 012207
PAZ000-020400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 336
NWS STORM PREDICTION CENTER NORMAN OK
605 PM EDT FRI JUN 1 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

       CENTRAL AND NORTHERN PENNSYLVANIA

EFFECTIVE THIS FRIDAY NIGHT FROM 605 PM UNTIL MIDNIGHT EDT.

TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES EAST NORTHEAST OF
BRADFORD PENNSYLVANIA TO 35 MILES EAST SOUTHEAST OF STATE COLLEGE
PENNSYLVANIA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.

OTHER WATCH INFORMATION...CONTINUE...WW 332...WW 333...WW
334...WW 335...

DISCUSSION...PRE-COLD FRONTAL SQLN NOW NEARING JST EXPECTED TO
CONTINUE MOVING STEADILY ENEWD THROUGH TNGT...WHILE EMBEDDED
STORMS/CIRCULATIONS MOVE RAPIDLY NNEWD ALONG IT.  SATELLITE AND VWP
DATA SHOW UPR LVL SHORTWAVE TROUGH AMPLIFYING OVER OH ATTM.  THIS
SHOULD FOSTER STRENGTHENING OF DOWNSTREAM S TO SWLY 850-700 MB FLOW
ACROSS CNTRL/ERN PA DURING THE NEXT FEW HRS.  COUPLED WITH
ASSOCIATED INCREASE IN LARGE SCALE FORCING FOR ASCENT...SETUP MAY
SUPPORT NNEWD DEVELOPMENT OF SQLN INTO N CNTRL PA.  GIVEN STRENGTH
OF WIND FIELD AND FORCED UPLIFT ALONG SQLN...EMBEDDED STORMS MAY
POSE A RISK FOR LOCALLY DMGG WIND/BRIEF TORNADOES DESPITE WEAK
LOW-LVL BUOYANCY.

AVIATION...TORNADOES AND 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
400. MEAN STORM MOTION VECTOR 20040.


...CORFIDI

Tornado Watches in Pennsylvania, 2012Every tornado watch in 2012

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.