Alert archive / Massachusetts / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 39, NWS Boston/Norton, MA
NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 18, 1991, 6:30 PM EDT for Essex County, Middlesex County, Massachusetts. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Aug 18, 1991, 6:30 PM EDT (22:30 UTC)
- Expired
- Aug 18, 1991, 7:30 PM EDT
- In force
- 60 min
- Issued by
- NWS Boston/Norton, MA
- Area
- Whole counties
Counties Essex County, MA, Middlesex County, MA
The nearest sounding before it
Chatham, MA (KCHH), launched 12:00Z, 10.5 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.
- Mixed-layer CAPE
- 247 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 619 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 123 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KBOS 182231 SVRBOS MAC017-009-182330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE BOSTON MA 630 PM EDT SUN AUG 18 1991 THE NATIONAL WEATHER SERVICE IN BOSTON HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 730 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN EAST MASSACHUSETTS ...NORTHERN MIDDLESEX COUNTY IN NORTHEAST MASSACHUSETTS ...ESSEX COUNTY AND THE ADJACENT COASTAL WATERS. AT 630 PM EDT RADAR SHOWS A SEVERE THUNDERSTORM IN THE HARVARD AT 630 PM EDT A SEVERE THUNDERSTORM IS BEING REPORTED IN THE HARVARD LITTLETON AREA OF NORTHEASTERN MASSACHUSETTS. THIS STORM IS MOVING NORTHEAST AT AROUND 25 MPH AND WILL MOVE ACROSS THE NORTHERN PORTION OF MIDDLESEX COUNTY AND INTO ESSEX COUNTY DURING THE NEXT HOUR. 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, Aug 18, 3:16 PM EDT, 3 hours 14 minutes before
CTZALL-MAZ005-182100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARTFORD CT 315 PM EDT SUN AUG 18 1991 A LINE OF THUNDERSTORMS WERE MOVING ACROSS BERKSHIRE COUNTY IN MASSACHUSETTS AND APPROACHING WESTERN CONNECTICUT... AT 300 PM...RADAR INDICATED A LINE OF THUNDERSTORMS STRETCHING FROM BRATTLEBORO VERMONT...SOUTHWEST THROUGH BERKSHIRE COUNTY IN MASSACHUSETTS...CONTINUING TO NEAR POUGHKEEPSIE NEW YORK. THE STRONGEST THUNDERSTORMS WAS LOCATED NEAR POUGHKEEPSIE NEW YORK AND NEAR PLAINFIELD IN HAMPSHIRE COUNTY IN MASSACHUSETTS. THESE STORMS MAY CONTAIN STRONG WINDS...DANGEROUS LIGHTNING AND VERY HEAVY RAINS. THESE STORMS WERE MOVING EAST AT 30 MPH WITH THE NORTHERN STORMS ENTERI'NG HAMPDEN COUNTY IN MASSACHUSETTS AFTER 330 PM AND THE SOUTHERN STORM CROSSING INTO CONNECTICUT AROUND 345 PM. WHITTIER
Special weather statement, Aug 18, 3:31 PM EDT, 2 hours 59 minutes before
MAZ004-182100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WORCESTER MA 330 PM EDT SUN AUG 18 1991 ...THERE ARE THUNDERSTORMS ARE MOVING THROUGH WORCESTER COUNTY... AT 325 PM RADAR SHOWED HEAVY THUNDERSTORMS IN WORCESTER COUNTY. THEY WERE MOVING EAST AT 40 MILES AN HOUR. THESE STORMS ARE PART OF AN AREA OF SHOWERS AND THUNDERSTORMS IN WESTERN AND CENTRAL MASSACHUSETTS. THESE STORMS MAY HAVE HEAVY RAIN ...DANGEROUS LIGHTNING AND SMALL HAIL. PERSONS IN WORCESTER COUNTY SHOULD BE ALERT FOR THREATENING WEATHER FOR THE NEXT HOUR AND TAKE COVER IF NECESSARY. DO NOT ATTEMPT TO DRIVE THROUGH FLOODED ROADS. BILODEAU
Special weather statement, Aug 18, 4:15 PM EDT, 2 hours 15 minutes before
MAZALL-182100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BOSTON MA 415 PM EDT SUN AUG 18 1991 AT 410 PM...RADAR SHOWED AN AREA OF SHOWERS AND THUNDERSTORMS EXTENDING FROM SOUTHERN NEW HAMPSHIRE ACROSS CENTRAL MASSACHUSETTS TO NORTHWEST CONNECTICUT. THIS AREA IS MOVING EAST AT 40 MILES AN HOUR. RADAR ALSO SHOWS STRONG THUNDESTORMS ACROSS SOUTHWEST NEW HAMPSHIRE AND CENTRAL MASSACHUSETTS. THESE STORMS MAY HAVE HEAVY RAIN...DANGEROUS LIGHTING AND SMALL HAIL. PERSONS IN EASTERN AND CENTRAL MASSACHUSETTS SHOULD BE ALERT FOR THREATING WEATHER DURING THE NEXT SEVERAL HOURS AND TAKE COVER IF NECESSARY. HANLEY
Special weather statement, Aug 18, 4:29 PM EDT, 2 hours 1 minute before
RIZALL-182230- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PROVIDENCE RI 430 PM EDT SUN AUG 18 1991 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR ALL OF RHODE ISLAND UNTIL 9 PM... CONDITIONS IN THE ATMOSPHERE APPEAR FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS HERE IN RHODE ISLAND. THESE STORMS MAY CONTAIN DAMAGING WINDS...LARGE HAIL AND DEADLY LIGHTNING. AT 415 PM...WEATHER SERVICE RADAR SHOWED A LINE OF SHOWERS AND THUNDERSTORMS FROM SOUTHERN NEW HAMPSHIRE TO NORTHWEST CONNECTICUT. THE STRONGEST STORMS WERE OVER SOUTHERN NEW HAMPSHIRE AND CENTRAL MASSACHUSETTTS. SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL WERE ALSO ROLLING THROUGH THE LOWER HUDSON VALLEY OF NEW YORK. THE ACTIVITY WAS HEADING NORTHEAST AT 30 MPH. ALL RHODE ISLANDERS SHOULD REMAIN ALERT AND BE ON THE LOOKOUT FOR THREATNING WEATHER. IF SEVERE THUNDERSTORMS BECOME IMMINENT FOR THE OCEAN STATE OR ACTUALLY OCCUR...WARNINGS WILL BE ?ISSUED. STAY TUNED TO NOAA WEATHER RADIO FOR LATER STATEMENTS AND POSSIBLE WARNINGS. CADIMA
Special weather statement, Aug 18, 4:54 PM EDT, 1 hour 36 minutes before
MAZALL-182145- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BOSTON MA 448 PM EDT SUN AUG 18 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR MOST OF MASSACHUSETTS... A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MOST OF MASSACHUSETTS EXCEPT NANTUCKET ISLAND AND MARTHAS VINEYARD UNTIL 9PM EDT. PERSONS SHOULD BE ALERT FOR THREATING WEATHER AND TAKE COVER IF NECESSARY. HANLEY
Special weather statement, Aug 18, 5:18 PM EDT, 1 hour 12 minutes before
MAZALL-190015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BOSTON MA 515 PM EDT SUN AUG 18 1991 ...A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 9 PM EDT FOR ALL OF MASSACHUSETTS EXCEPT THE BERKSHIRES AND THE ISLANDS SOUTH OF CAPE COD INCLUDING NANTUCKET AND MARTHAS VINEYARD... RADAR SHOWS A LINE OF THUNDERSTORMS EXTENDING FROM THE NORTHEASTERN PORTION OF THE STATE TO THE SOUTH CENTRAL PORTION. THIS LINE IS MOVING EAST AT ARO/UND 25 MPH. SOME OF THESE THUNDERSTORMS MAY BE ACCOMPANIED BY DAMAGING WINDS...HAIL...FREQUENT LIGHTNING AND HEAVY DOWNPOURS. PERSONS SHOULD BE ALERT FOR THREATING WEATHER AND TAKE APPROPRIATE ACTION. DUNNE
The office that day
Everything else NWS Boston/Norton, MA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 5:23 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 52 min |
| Aug 18, 5:34 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex | 56 min |
| Aug 18, 6:00 PM EDT | Severe Thunderstorm Warning | BOX | Worcester | 60 min |
| Aug 18, 7:33 PM EDT | Severe Thunderstorm Warning | BOX | Essex, Middlesex, Worcester | 57 min |
Nearby
Severe Thunderstorm Warnings in Massachusetts, 1991Every severe thunderstorm warning in 1991
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.