Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 55, NWS Boston/Norton, MA

July 25, 1994Middlesex County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this severe thunderstorm warning at Jul 25, 1994, 12:46 PM EDT for Middlesex County, Worcester County, Massachusetts. It was in force for 59 min.

The area

The counties it named.

The facts

Issued
Jul 25, 1994, 12:46 PM EDT (16:46 UTC)
Expired
Jul 25, 1994, 1:45 PM EDT
In force
59 min
Issued by
NWS Boston/Norton, MA
Area
Whole counties

Counties Middlesex County, MA, Worcester County, MA

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 4.8 hours before the alert went out and 162 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 1994-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 380 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 1994-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -24 square meters per square second.1939Sfc1 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
380 J/kg
Mixed-layer CIN
-101 J/kg
Mixed-layer LCL
826 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-24 m²/s²
0-3 km storm-relative helicity
-24 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.2

Open this sounding in Storm Lab

The text

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

000 
WUUS1 KBOS 251648 RRA
SVRBOS
MAC017-027-251745-
 
BULLETIN - EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TAUNTON MA
1246 PM EDT MON JUL 25 1994
 
THE NATIONAL WEATHER SERVICE IN TAUNTON HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  145 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN  MASSACHUSETTS
 
   ...MIDDLESEX COUNTY
 
IN CENTRAL MASSACHUSETTS
 
   ...WORCESTER COUNTY
 
A SEVERE THUNDERSTORM WAS DETECTED BY NATIONAL WEATHER SERVICE RADAR AT
1245 PM FROM WORCESTER TO MAYNARD. THESE STORM WERE MOVING EAST AT 25
MPH.
 
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55
MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.
FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR
OF YOUR HOME OR BUSINESS.  HEAVY RAINS FLOOD ROADS QUICKLY SO
DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

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.

In the hours before

Special weather statement, Jul 25, 12:39 PM EDT, 7 minutes before
MAZ004-005-012-251845-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1239 PM EDT MON JUL 25 1994

AT 1235 PM WEATHER RADAR INDICATED THUNDERSTORMS WITH HEAVY RAIN AND
POSSIBLY SMALL HAIL IN EASTERN WORCESTER COUNTY...NEAR WESTBORO. IT WAS
MOVING EAST NORTHEAST AND WILL HEAD INTO WESTERN MIDDLESEX COUNTY BY 1
PM.

THESE THUNDERSTORMS MAY BE ACCOMPANIED BY GUSTY WINDS...HEAVY RAINS AND
SMALL HAIL AS THEY AFFECT EASTERN WORCESTER AND MIDDLESEX COUNTY.
IF THUNDERSTORMS APPROACH...BE READY HEAD INDOORS.

VALLEE
Special weather statement, Jul 25, 12:41 PM EDT, 5 minutes before
MAZ004-005-012-251845-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TAUNTON MA
1239 PM EDT MON JUL 25 1994

AT 1235 PM WEATHER RADAR INDICATED THUNDERSTORMS WITH HEAVY RAIN AND
POSSIBLY SMALL HAIL IN EASTERN WORCESTER COUNTY...NEAR WESTBORO. IT WAS
MOVING EAST NORTHEAST AND WILL HEAD INTO WESTERN MIDDLESEX COUNTY BY 1
PM.

THESE THUNDERSTORMS MAY BE ACCOMPANIED BY GUSTY WINDS...HEAVY RAINS AND
SMALL HAIL AS THEY AFFECT EASTERN WORCESTER AND MIDDLESEX COUNTY.
IF THUNDERSTORMS APPROACH...BE READY HEAD INDOORS.

VALLEE

Nearby

Severe Thunderstorm Warnings in Massachusetts, 1994Every severe thunderstorm warning in 1994

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.