Alert archive / Connecticut / Flash Flood Warnings in 1989

Flash Flood Warning 10, NWS Boston/Norton, MA

October 21, 1989Capitol Planning Region, Northwest Hills Planning Region, Connecticut; Hampden County, Massachusetts

NWS Boston/Norton, MA issued this flash flood warning at Oct 21, 1989, 1:11 AM EDT for Capitol Planning Region, Northwest Hills Planning Region, Connecticut; Hampden County, Massachusetts. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Oct 21, 1989, 1:11 AM EDT (05:11 UTC)
Expired
Oct 21, 1989, 4:00 AM EDT
In force
3 hr
Issued by
NWS Boston/Norton, MA
Area
Whole counties

Counties Capitol Planning Region, CT, Northwest Hills Planning Region, CT, Hampden 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 00:00Z, 5.2 hours before the alert went out and 237 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 00:00Z on 1989-10-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 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 00:00Z on 1989-10-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 260 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
27 J/kg
Mixed-layer CIN
-80 J/kg
Mixed-layer LCL
755 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
260 m²/s²
0-3 km storm-relative helicity
272 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.6

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.

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 21, 1:11 AM EDTFlash Flood WarningBOXSoutheastern Connecticut Planning Region, Northeastern Connecticut Planning Region3 hr

Nearby

Flash Flood Warnings in Connecticut, 1989Flash Flood Warnings in Massachusetts, 1989Every flash flood warning in 1989

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.