Alert archive / Vermont / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 21, NWS Burlington, VT

July 25, 1987Addison County, Rutland County, Vermont

NWS Burlington, VT issued this severe thunderstorm warning at Jul 25, 1987, 5:40 PM EDT for Addison County, Rutland County, Vermont. It was in force for 90 min. 2 reports 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 25, 1987, 5:40 PM EDT (21:40 UTC)
Expired: Jul 25, 1987, 7:10 PM EDT
In force: 90 min
Issued by: NWS Burlington, VT
Area: Whole counties

Counties Addison County, VT, Rutland County, VT

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Jul 25, 6:00 PM EDT	Thunderstorm Wind 0	Addison, VT
Jul 25, 6:00 PM EDT	Thunderstorm Wind 0	Addison, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Albany, NY (KALB), launched 12:00Z, 9.7 hours before the alert went out and 138 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: 1399 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 68 m²/s²
0-3 km storm-relative helicity: 84 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBTV 252140
SVRBTV
VTC001-021-252310-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BURLINGTON VT
540 PM EDT SAT JUL 25 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 710 PM EDT FOR THE FOLLOWING COUNTIES OF
 
VERMONT... ADDISON... RUTLAND
                                                                         
AT 535 PM A SEVERE THUNDERSTORM WAS DETECTED BY RADAR IN SOUTHWEST 
ADDISON COUNTY NEAR SHOREHAM MOVING SOUTHEAST AT 25 MPH. THIS STORM 
WILL REACH HUBBARDTON IN NORTHERN RUTLAND COUNTY NEAR 615 PM. 
 
THESE THUNDERSTORMS MAY PRODUCE LARGE HAIL...HEAVY RAINS...
DAMAGING WIND2S AND DANGEROUS LIGHTNING.
 
JVL

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 3:50 PM EDT	Severe Thunderstorm Warning	BTV	Windham	60 min

Nearby

Severe Thunderstorm Warnings in Vermont, 1987 Every severe thunderstorm warning in 1987

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.