Alert archive / Vermont / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 31, NWS Burlington, VT

July 4, 2002Addison County, Washington County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 4, 2002, 1:18 PM EDT for Addison County, Washington County, Vermont. It was in force for 42 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 4, 2002, 1:18 PM EDT (17:18 UTC)
Expired: Jul 4, 2002, 2:00 PM EDT
In force: 42 min
Issued by: NWS Burlington, VT
Area: Whole counties

Counties Addison County, VT, Washington County, VT

The radar

The Burlington radar (KCXX), 46 km from the middle of the area, began a volume at 17:18 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.

What was reported inside it

Time	Report	Where	Remark
Jul 4, 1:55 PM EDT	Hail 1	Warren, VT

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 4, 12:30 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Albany, NY (KALY), launched 12:00Z, 5.3 hours before the alert went out and 180 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: 1695 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: -46 m²/s²
0-3 km storm-relative helicity: -15 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KBTV 041718
SVRBTV
VTC001-023-041800-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
117 PM EDT THU JUL 4 2002

THE NATIONAL WEATHER SERVICE IN BURLINGTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WASHINGTON COUNTY IN VERMONT
  ADDISON COUNTY IN VERMONT

* UNTIL 200 PM EDT

* AT 113 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 4 MILES NORTHEAST OF BRISTOL...MOVING EAST AT
  20 MPH.

* THE SEVERE THUNDERSTORM WILL BE...
  NEAR HANKSVILLE...BRISTOL AROUND 120 PM EDT
  NEAR WAITSFIELD...WARREN AROUND 140 PM EDT
  NEAR MORETOWN AROUND 150 PM EDT
  NEAR NORTHFIELD...ROXBURY...9 MILES SOUTHWEST OF MONTPELIER AROUND
  200 PM EDT

ADVANCE PLANNING DURING A SEVERE WEATHER WATCH IS ESSENTIAL. MAKE
SURE YOUR FAMILY KNOWS WHERE TO GO...AND WHAT TO DO IN THE EVENT
SEVERE THUNDERSTORM WARNINGS ARE ISSUED.

.END

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Burlington, VT wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 4, 12:42 PM EDT, 36 minutes earlier.

Area forecast discussion, Jul 4, 12:42 PM EDT, 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
1242 PM EDT THU JUL 4 2002

HV UPDTD FCST FOR SVR TSTM WATCH UNTIL 6PM. MADE A FEW ADJUSTMENTS
TO TEMPS BASED ON CURRENT READINGS AND TOOK OUT MNTN OF PCPN FOR ST
LAW CNTY.

.BTV...SVR TSTM WATCH VTZ001>012...NYZ027>031-034-035

MCGILL

In the hours before

Special weather statement, Jul 4, 12:43 PM EDT, 35 minutes before

NYC019-031-033-VTC001-005-007-009-011-013-015-017-019-021-023-
027-042200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
1243 PM EDT THU JUL 4 2002

...THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM
WATCH ACROSS MUCH OF NORTHERN NEW YORK AND ALL OF VERMONT UNTIL
600 PM EDT...

IN NEW YORK THIS WATCH INCLUDES THE COUNTIES OF...CLINTON...FRANKLIN
AND ESSEX. IN VERMONT THIS WATCH INCLUDES THE COUNTIES
OF...ESSEX...GRAND ISLE...FRANKLIN...ORLEANS...LAMOILLE...
CALEDONIA...CHITTENDEN...WASHINGTON...ADDISON...ORANGE...WINDSOR AND
RUTLAND.

A COLD FRONT WILL BE MOVING DOWN ACROSS THE REGION TODAY FROM THE
NORTH. THUNDERSTORMS WILL BE DEVELOPING ACROSS THE REGION TODAY
AHEAD OF THIS FRONT.

PERSONS WITH OUTDOOR ACTIVITIES SHOULD KEEP AN EYE ON THE SKY AND
SEEK SHELTER INDOORS IMMEDIATELY SHOULD THUNDERSTORMS APPROACH. STAY
TUNED TO NOAA WEATHER RADIO FOR LATER STATEMENTS AND WARNINGS FROM
THE NATIONAL WEATHER SERVICE IN BURLINGTON VERMONT.

MURRAY/WFO BTV

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 3, 9:00 PM EDT	Severe Thunderstorm Warning	BTV	Grand Isle	30 min
Jul 3, 10:01 PM EDT	Severe Thunderstorm Warning	BTV	Lamoille	29 min
Jul 3, 10:14 PM EDT	Severe Thunderstorm Warning	BTV	Orleans	46 min
Jul 3, 10:46 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia	44 min
Jul 4, 1:07 PM EDT	Severe Thunderstorm Warning	BTV	Caledonia, Orleans	53 min
Jul 4, 1:41 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, Lamoille	49 min
Jul 4, 1:57 PM EDT	Severe Thunderstorm Warning	BTV	Washington	48 min
Jul 4, 2:06 PM EDT	Severe Thunderstorm Warning	BTV	Orleans	54 min
Jul 4, 2:20 PM EDT	Severe Thunderstorm Warning	BTV	Orange	55 min
Jul 4, 2:51 PM EDT	Severe Thunderstorm Warning	BTV	Chittenden	24 min
Jul 4, 3:14 PM EDT	Severe Thunderstorm Warning	BTV	Orange	61 min
Jul 4, 3:16 PM EDT	Flash Flood Warning	BTV	Washington	3 hr
Jul 4, 4:01 PM EDT	Flash Flood Warning	BTV	Washington	3 hr
Jul 4, 4:02 PM EDT	Flash Flood Warning	BTV	Orange	3 hr
Jul 4, 4:13 PM EDT	Severe Thunderstorm Warning	BTV	Orange	47 min
Jul 4, 6:13 PM EDT	Severe Thunderstorm Warning	BTV	Windsor	32 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2002 Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.