Alert archive / Massachusetts / Flash Flood Warnings in 1990

Flash Flood Warning 1, NWS Boston/Norton, MA

July 24, 1990Bristol County, Plymouth County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Jul 24, 1990, 12:23 PM EDT for Bristol County, Plymouth County, Massachusetts. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 24, 1990, 12:23 PM EDT (16:23 UTC)
Expired
Jul 24, 1990, 3:30 PM EDT
In force
3 hr
Issued by
NWS Boston/Norton, MA
Area
Whole counties

Counties Bristol County, MA, Plymouth County, MA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 4.4 hours before the alert went out and 81 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 1990-07-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 418 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 1990-07-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 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
418 J/kg
Mixed-layer CIN
-36 J/kg
Mixed-layer LCL
588 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
45 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KBOS 241625 COR
FFWBOS
MAC023-005-241930-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE BOSTON MA
1223 PM EDT TUE JUL 24 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A FLOOD WARNING
EFFECTIVE UNTIL 330 PM EDT FOR PEOPLE IN THE FOLLOWING
COUNTIES

   IN THE SOUTHEAST PART OF MASSACHUSETTS
      PLYMOUTH...BRISTOL

1220 EDT A FLOOD WARNING WAS IN EFFECT FOR BRISTOL AND PLYMOUTH
COUNTIES OF MASSACHUSETTS.&

A FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  ALL PERSONS
IN FLOOD PRONE AREAS SHOULD TAKE WHATEVER PRECAUTIONS ARE REQUIRED.
BE PREPARED FOR QUICK EVASIVE ACTION IF FLOODING IS OBSERVED.
 DUNNE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 24, 3:00 PM EDTFlash Flood WarningBOXBristol, Plymouth4 hr

Nearby

Flash Flood Warnings in Massachusetts, 1990Every flash flood warning in 1990

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.