Alert archive / New Hampshire / Flash Flood Warnings in 1990

Flash Flood Warning 2, NWS Gray, ME

March 18, 1990Coos County, New Hampshire

NWS Gray, ME issued this flash flood warning at Mar 18, 1990, 1:02 AM EST for Coos County, New Hampshire. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Mar 18, 1990, 1:02 AM EST (06:02 UTC)
Expired
Mar 18, 1990, 5:00 AM EST
In force
4 hr
Issued by
NWS Gray, ME
Area
Whole counties

County Coos 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, 6.0 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, Gray, ME at 00:00Z on 1990-03-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 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 1990-03-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 244 square meters per square second.1939587897Sfc1 km3 km6 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
3579 m above ground
0-6 km bulk shear
61 kt
0-1 km storm-relative helicity
244 m²/s²
0-3 km storm-relative helicity
270 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 180602
FFWCON
NHC007-181000-

BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE CONCORD NH
102 AM EST SUN MAR 18 1990

THE NATIONAL WEATHER SERVICE IN CONCORD HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL 5 AM EST FOR PEOPLE
IN THE FOLLOWING COUNTY...

IN NORTH NEW HAMPSHIRE
          ...COOS

FLOODING CONTINUES ALONG THE AMMONOOSUC RIVER NEAR GROVETON
...WITH WATER OVER ROUTE 110.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR
TO CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 18, 5:26 AM ESTFlash Flood WarningGYXCoos4 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.