Alert archive / New Hampshire / Flash Flood Warnings in 1990

Flash Flood Warning 7, NWS Gray, ME

August 11, 1990Grafton County, New Hampshire

NWS Gray, ME issued this flash flood warning at Aug 11, 1990, 12:29 AM EDT for Grafton County, New Hampshire. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Aug 11, 1990, 12:29 AM EDT (04:29 UTC)
Expired
Aug 11, 1990, 5:30 AM EDT
In force
5 hr
Issued by
NWS Gray, ME
Area
Whole counties

County Grafton County, NH

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

Gray, ME (KGYX), launched 00:00Z, 4.5 hours before the alert went out and 125 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, Gray, ME at 00:00Z on 1990-08-11Temperature 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, Gray, ME at 00:00Z on 1990-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 94 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3611 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
94 m²/s²
0-3 km storm-relative helicity
129 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 KCON 110432 COR
FFWCON
NHC009-110930-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CONCORD NH
1229 AM EDT SAT AUG 11 1990

THE NATIONAL WEATHER SERVICE IN CONCORD HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  530 AM EDT
FOR PEOPLE IN THE FOLLOWING COUNTY...

IN NORTHWEST NEW HAMPSHIRE
          ...SOUTHERN GRAFTON

PERSISTANT HEAVY RAINS DURING THIS EVENING HAVE PUSHED MANY SMALL
RIVERS AND STREAMS OVER BANKFULL. THE CIVIL DEFENSE AT PLYMOUTH REPORT
SOME ROAD WASHOUTS AND NUMEROUS ROAD PROBLEMS.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.  MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS /IF WATER COVERS
THE ROADWAY.  NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL
ONE...ON FOOT.  TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.

WESTER

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 10, 9:38 PM EDTFlash Flood WarningGYXBelknap, Carroll, Merrimack8 hr
Aug 11, 10:07 AM EDTFlash Flood WarningGYXHillsborough4 hr
Aug 11, 11:57 AM EDTFlash Flood WarningGYXMerrimack4 hr
Aug 11, 11:57 AM EDTFlash Flood WarningGYXBelknap, Carroll, Grafton4 hr

Nearby

Flash Flood Warnings in New Hampshire, 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.