Alert archive / Massachusetts / Tornado Warnings in 1986

Tornado Warning 4, NWS Boston/Norton, MA

August 7, 1986Bristol County, Massachusetts

NWS Boston/Norton, MA issued this tornado warning at Aug 7, 1986, 5:42 PM EDT for Bristol County, Massachusetts. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Aug 7, 1986, 5:42 PM EDT (21:42 UTC)
Expired
Aug 7, 1986, 6:40 PM EDT
In force
58 min
Issued by
NWS Boston/Norton, MA
Area
Whole counties

County Bristol County, MA

The radar

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

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 9.7 hours before the alert went out and 93 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-pSkew-T log-p diagram, Chatham, MA at 12:00Z on 1986-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Chatham, MA at 12:00Z on 1986-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
8 J/kg
Mixed-layer CIN
-244 J/kg
Mixed-layer LCL
1119 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
30 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 
TTAA00 KBOS 072142
TORBOS
MAC005-072240-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BOSTON MA
542 PM EDT THU AUG 7 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A TORNADO WARNING 
EFFECTIVE UNTIL 640 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF

SOUTHEAST MASSACHUSETTS...NORTHERN BRISTOL AND THE CITY OF TAUNTON

AT 530 PM EDT A TORNADO WAS SIGHTED OVER PROVIDENCE RI
AND MOVING NORTHEAST AROUND 30 MPH.

 THIS IS A DANGEROUS STO8RM.  TAKE COVER IMMEDIATELY !

 THIS STORM IS ACCOMPANIED BY INTENSE LIGHTNING AND STRONG GUSTY
 WINDS.

 AUCIELLO

The office that day

Everything else NWS Boston/Norton, MA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 7, 3:31 PM EDTTornado WarningBOXEssex, Middlesex59 min
Aug 7, 4:29 PM EDTSevere Thunderstorm WarningBOXNorfolk, Suffolk61 min
Aug 7, 4:29 PM EDTSevere Thunderstorm WarningBOXBristol61 min
Aug 7, 6:33 PM EDTSevere Thunderstorm WarningBOXPlymouth57 min
Aug 7, 7:35 PM EDTSevere Thunderstorm WarningBOXPlymouth55 min

Nearby

Tornado Warnings in Massachusetts, 1986Every tornado warning in 1986Tornadoes in 1986

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.