Severe Thunderstorm Watch 417

Issued

Jun 22, 2012, 1:41 PM EDT (17:41 UTC)

Expired

Jun 22, 2012, 9:00 PM EDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

65 kt

The Binghamton radar (KBGM), 139 km from the middle of the area, began a volume at 17:42 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

5%

One or more EF2 to EF5 tornadoes

5%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

30%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

20%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 1239Jun 22, 12:18 PM EDT
• Mesoscale Discussion 1242Jun 22, 4:33 PM EDT
• Mesoscale Discussion 1244Jun 22, 6:42 PM EDT

298 
WWUS20 KWNS 221744
SEL7
SPC WW 221744
CTZ000-MAZ000-NJZ000-NYZ000-PAZ000-CWZ000-230100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 417
NWS STORM PREDICTION CENTER NORMAN OK
145 PM EDT FRI JUN 22 2012

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

       CONNECTICUT
       WESTERN MASSACHUSETTS
       CENTRAL AND NORTHERN NEW JERSEY
       SOUTHEASTERN NEW YORK AND LONG ISLAND
       SOUTH-CENTRAL AND EASTERN PENNSYLVANIA
       COASTAL WATERS

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 145 PM UNTIL 900
PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 105
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHEAST OF
HARRISBURG PENNSYLVANIA TO 35 MILES NORTHWEST OF PITTSFIELD
MASSACHUSETTS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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...TSTMS INCREASING IN COVERAGE/INTENSITY ALONG/AHEAD OF
SFC COLD FRONT OVER CENTRAL PA ARE EXPECTED TO OFFER PRIMARY RISK OF
DAMAGING GUSTS...WITH ISOLATED LARGE HAIL ALSO POSSIBLE.  ACTIVITY
WILL MOVE INTO ENVIRONMENT CHARACTERIZED BY WELL-MIXED BOUNDARY
LAYERS...MUCAPE UP TO AROUND 2500 J/KG AND 25-35 KT EFFECTIVE SHEAR
MAGNITUDES...IN SUPPORT OF PRIMARY MULTICELLULAR MODE.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 26030.


...EDWARDS

Severe Thunderstorm Watches in Pennsylvania, 2012Severe Thunderstorm Watches in New York, 2012Severe Thunderstorm Watches in New Jersey, 2012Every severe thunderstorm 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.