Severe Thunderstorm Watch 421

Issued

Jun 19, 2007, 3:23 PM EDT (19:23 UTC)

Expired

Jun 19, 2007, 9:35 PM EDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The Burlington radar (KCXX), 112 km from the middle of the area, began a volume at 19:24 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

10%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

20%

One or more hailstones of 2 inches or more

10%

Six or more combined severe hail and wind reports

70%

• Mesoscale Discussion 1198Jun 19, 3:03 PM EDT
• Mesoscale Discussion 1204Jun 19, 7:38 PM EDT

000
WWUS20 KWNS 191923
SEL1  
SPC WW 191923
CTZ000-MAZ000-NYZ000-VTZ000-200300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 421
NWS STORM PREDICTION CENTER NORMAN OK
325 PM EDT TUE JUN 19 2007

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

       PARTS OF WESTERN CONNECTICUT
       PARTS OF WESTERN MASSACHUSETTS
       MUCH OF EASTERN NEW YORK
       VERMONT

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 325 PM UNTIL
1100 PM EDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF
BURLINGTON VERMONT TO 20 MILES EAST SOUTHEAST OF MONTICELLO NEW
YORK.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED
WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 417...WW 418...WW
419...WW 420...

DISCUSSION...THUNDERSTORMS WILL CONTINUE TO INCREASE IN NUMBER AND
INTENSITY ACROSS WATCH AREA AS MDTLY UNSTABLE AIR MASS CONTINUES TO
HEAT.  WITH APPROACH OF UPPER TROUGH...SHEAR WILL INCREASE WITH
STORMS EVOLVING INTO SHORT LINE SEGMENTS ENHANCING PRIMARILY WIND
DAMAGE POTENTIAL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25025.


...HALES

Severe Thunderstorm Watches in New York, 2007Severe Thunderstorm Watches in Vermont, 2007Severe Thunderstorm Watches in Connecticut, 2007Every severe thunderstorm watch in 2007

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.