Alert archive / Vermont / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 474

June 26, 200210 counties in New Hampshire; 14 counties in Vermont

The Storm Prediction Center issued this severe thunderstorm watch at Jun 26, 2002, 3:15 PM EDT for 10 counties in New Hampshire; 14 counties in Vermont. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jun 26, 2002, 3:15 PM EDT (19:15 UTC)
Expired: Jun 26, 2002, 9:00 PM EDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 24 counties

Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH, Sullivan County, NH, Addison County, VT, Bennington County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Grand Isle County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windham County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 109 km from the middle of the area, began a volume at 19:09 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.

Warnings issued inside it

7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jun 26, 3:41 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden, Washington	64 min
Jun 26, 3:49 PM EDT	Severe Thunderstorm Warning	BTV	Addison	41 min
Jun 26, 3:55 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Orange	65 min
Jun 26, 4:14 PM EDT	Severe Thunderstorm Warning	BTV	Lamoille, Orleans	46 min
Jun 26, 4:49 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	41 min
Jun 26, 4:53 PM EDT	Severe Thunderstorm Warning	BTV	Essex	37 min
Jun 26, 5:10 PM EDT	Severe Thunderstorm Warning	BTV	Addison	65 min

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 7.3 hours before the alert went out and 136 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 42 J/kg
Mixed-layer CIN: -245 J/kg
Mixed-layer LCL: 1168 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 261849
SEL4  
SPC WW 261845
NHZ000-VTZ000-270100-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 474
STORM PREDICTION CENTER NORMAN OK
245 PM EDT WED JUN 26 2002

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

   NEW HAMPSHIRE                      
   VERMONT                            

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 315 PM UNTIL
900 PM EDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 10 MILES NORTH OF NEWPORT VERMONT TO
20 MILES SOUTH SOUTHEAST OF KEENE NEW HAMPSHIRE.

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 472...WW 473...

DISCUSSION...STRONG STORMS OVER NNRN NY ARE EXPECTED TO INTENSIFY
AS THEY MOVE EWD INTO UNSTABLE AIR MASS WITH SBCAPE OF 2000-3000
J/KG.  MODERATELY STRONG MID LEVEL WINDS OF 35-45 KT ARE PROVIDING
SUFFICIENT VERTICAL SHEAR TO ENHANCE THREAT FOR WIND DAMAGE...ALONG
WITH OCCASIONAL LARGE HAIL.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550.  MEAN STORM
MOTION VECTOR 25035.


...WEISS

450,0710 423,0705 423,0731 450,0732

Nearby

Severe Thunderstorm Watches in Vermont, 2002 Severe Thunderstorm Watches in New Hampshire, 2002 Every severe thunderstorm watch in 2002

Sources

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.