Alert archive / Massachusetts / Flash Flood Warnings in 1991

Flash Flood Warning 3, NWS Boston/Norton, MA

August 19, 1991Franklin County, Hampshire County, Worcester County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Aug 19, 1991, 12:28 PM EDT for Franklin County, Hampshire County, Worcester County, Massachusetts. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Aug 19, 1991, 12:28 PM EDT (16:28 UTC)
Expired
Aug 19, 1991, 8:15 PM EDT
In force
8 hr
Issued by
NWS Boston/Norton, MA
Area
Whole counties

Counties Franklin County, MA, Hampshire County, MA, Worcester County, MA

The nearest sounding before it

Albany, NY (KALB), launched 12:00Z, 4.5 hours before the alert went out and 122 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, Albany, NY at 12:00Z on 1991-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Albany, NY at 12:00Z on 1991-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 59 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
735 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
59 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 flash flood 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 19, 7:19 AM EDT, 5 hours 9 minutes before
MAZALL-192200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BOSTON MA
720 AM EDT MON AUG 19 1991

...TORNADO WATCH FOR SOUTHERN NEW ENGLAND...

TORNADO WATCH NUMBER 736 HAS BEEN ISSUED FOR ALL OF SOUTHERN NEW ENGLAND
...EFFECTIVE TIL 6 PM EDT.

WITH THE APPROACH AND PASSAGE OF HURRICANE BOB AND VERY UNSTABLE TROPICAL
AIR THROUGHOUT SOUTHERN NEW ENGLAND...CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS. PERSONS IN THE WATCH AREA SHOULD BE
ON THE LOOKOUT FOR THREATENING WEATHER CONTITIONS AND LISTEN FOR LATER
STATEMENTS AND POSSIBLE WARNINGS.

THE NEXT STATEMENT ON THIS SITUATION WILL BE ISSUED BY THE NATIONAL
WEATHER SERVICEIN BOSTON AROUND 1030 AM EDT.

COTE

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 12:11 PM EDTFlash Flood WarningBOXHampden8 hr
Aug 19, 12:45 PM EDTFlash Flood WarningBOXEssex, Middlesex, Norfolk, Suffolk6 hr
Aug 19, 12:45 PM EDTFlash Flood WarningBOXBristol, Plymouth6 hr

Nearby

Flash Flood Warnings in Massachusetts, 1991Every flash flood 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.