Tornado Watch 635

Issued

Sep 8, 2012, 11:18 AM EDT (15:18 UTC)

Expired

Sep 8, 2012, 9:00 PM EDT

In force

10 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

The Brookhaven radar (KOKX), 75 km from the middle of the area, began a volume at 15:21 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

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

70%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

10%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1927Sep 8, 10:39 AM EDT
• Mesoscale Discussion 1931Sep 8, 1:30 PM EDT
• Mesoscale Discussion 1933Sep 8, 2:12 PM EDT
• Mesoscale Discussion 1934Sep 8, 2:46 PM EDT
• Mesoscale Discussion 1936Sep 8, 3:55 PM EDT
• Mesoscale Discussion 1937Sep 8, 4:22 PM EDT
• Mesoscale Discussion 1939Sep 8, 6:17 PM EDT

071 
WWUS20 KWNS 081520
SEL5  
SPC WW 081520
CTZ000-MAZ000-NJZ000-NYZ000-CWZ000-090100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 635
NWS STORM PREDICTION CENTER NORMAN OK
1120 AM EDT SAT SEP 8 2012

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

       WESTERN CONNECTICUT
       PARTS OF WESTERN MASSACHUSETTS
       NORTHEAST NEW JERSEY
       SOUTHEAST NEW YORK
       COASTAL WATERS

EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1120 AM UNTIL
900 PM EDT.

TORNADOES...HAIL TO 1 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 35 STATUTE
MILES EAST AND WEST OF A LINE FROM 10 MILES SOUTHWEST OF NEW YORK
CITY NEW YORK TO 10 MILES WEST NORTHWEST OF WESTFIELD
MASSACHUSETTS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).

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 634...

DISCUSSION...PRE-FRONTAL CONFLUENCE BAND AND MOIST AXIS WILL LIKELY
PERSIST INTO THE AFTERNOON...WITH OCCASIONAL THUNDERSTORM
DEVELOPMENT ALONG THE BAND IN RESPONSE TO LOW-LEVEL WARM ADVECTION
AND STRONGER SURFACE HEATING TO THE S.  VERTICAL SHEAR IS EXPECTED
TO INCREASE THROUGH THE AFTERNOON...ESPECIALLY INTO THE LOWER HUDSON
VALLEY...WHERE THE RISK FOR A FEW TORNADOES WILL GRADUALLY INCREASE.
MEANWHILE...A FRONTAL SQUALL LINE IS EXPECTED TO FORM FARTHER TO THE
W THIS AFTERNOON...AND MOVE INTO THE WATCH AREA BY THIS EVENING WITH
THE RISK FOR MORE WIDESPREAD DAMAGING WINDS...AS WELL AS TORNADOES
WITH CIRCULATIONS EMBEDDED IN THE LINE.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 21035.


...THOMPSON

Tornado Watches in New York, 2012Tornado Watches in Connecticut, 2012Tornado Watches in New Jersey, 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.