Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 21, NWS Boston/Norton, MA

August 8, 1986Norfolk County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 8, 1986, 11:18 AM EDT for Norfolk County, Massachusetts. It was in force for 72 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
Aug 8, 1986, 11:18 AM EDT (15:18 UTC)
Expired
Aug 8, 1986, 12:30 PM EDT
In force
72 min
Issued by
NWS Boston/Norton, MA
Area
Whole counties

County Norfolk County, MA

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

TimeReportWhereRemark
Aug 8, 12:00 PM EDTThunderstorm Wind 50Norfolk, MA

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

Chatham, MA (KCHH), launched 12:00Z, 3.3 hours before the alert went out and 115 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 1986-08-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1301 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 1986-08-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 103 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
1301 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
610 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
103 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBOS 081518
SVRBOS
MAC021-081630-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE BOSTON MA
1118 AM EDT FRI AUG 8 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 1230 PM EDT FOR PEOPLE IN THE FOLLOWING 
COUNTY OF

EXTREME EAST MASSACHUSETTS...NORFOLK

AT 1115 AM A SEVERE THUNDERSTORM WAS INDICATED BY RADAR NEAR
WOONSOCKET  RHODE ISLAND.  IT WAS MIVING NORTHEAST AROUND
30 MPH.

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

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 8, 11:00 AM EDTSevere Thunderstorm WarningBOXWorcester60 min
Aug 8, 11:37 AM EDTSevere Thunderstorm WarningBOXMiddlesex68 min
Aug 8, 3:55 PM EDTSevere Thunderstorm WarningBOXBristol, Plymouth65 min
Aug 8, 3:55 PM EDTSevere Thunderstorm WarningBOXBarnstable65 min
Aug 8, 4:24 PM EDTTornado WarningBOXMiddlesex66 min
Aug 8, 4:30 PM EDTSevere Thunderstorm WarningBOXWorcester60 min
Aug 8, 5:02 PM EDTTornado WarningBOXEssex58 min
Aug 8, 5:30 PM EDTSevere Thunderstorm WarningBOXWorcester60 min

Nearby

Severe Thunderstorm Warnings in Massachusetts, 1986Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.