Alert archive / Connecticut / Severe Thunderstorm Warnings in 1991

Severe Thunderstorm Warning 33, NWS Boston/Norton, MA

August 18, 1991Northwest Hills Planning Region, Connecticut

NWS Boston/Norton, MA issued this severe thunderstorm warning at Aug 18, 1991, 3:34 PM EDT for Northwest Hills Planning Region, Connecticut. It was in force for 56 min.

The area

The counties it named.

The facts

Issued: Aug 18, 1991, 3:34 PM EDT (19:34 UTC)
Expired: Aug 18, 1991, 4:30 PM EDT
In force: 56 min
Issued by: NWS Boston/Norton, MA
Area: Whole counties

County Northwest Hills Planning Region, CT

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 7.6 hours before the alert went out and 270 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: 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

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 2:59 PM EDT, 35 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Aug 18, 3:16 PM EDT, 18 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, 3 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

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, 6:30 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex	60 min
Aug 18, 7:33 PM EDT	Severe Thunderstorm Warning	BOX	Essex, Middlesex, Worcester	57 min
Aug 18, 4:37 PM EDT	Severe Thunderstorm Warning	BOX	Northwest Hills Planning Region	38 min
Aug 18, 5:05 PM EDT	Severe Thunderstorm Warning	BOX	Northwest Hills Planning Region	55 min

Nearby

Severe Thunderstorm Warnings in Connecticut, 1991 Every 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.