Alert archive / New Hampshire / Flash Flood Warnings in 1990

Flash Flood Warning 1, NWS Gray, ME

March 17, 1990Coos County, New Hampshire

NWS Gray, ME issued this flash flood warning at Mar 17, 1990, 6:50 PM EST for Coos County, New Hampshire. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Mar 17, 1990, 6:50 PM EST (23:50 UTC)
Expired
Mar 18, 1990, 12:45 AM EST
In force
6 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 12:00Z, 11.8 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 12:00Z on 1990-03-17Temperature 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 12:00Z on 1990-03-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 192 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
3521 m above ground
0-6 km bulk shear
57 kt
0-1 km storm-relative helicity
192 m²/s²
0-3 km storm-relative helicity
206 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 180001 COR
FFWCON
NHC007-180545-

BULLETIN - EBS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE CONCORD NH
650 PM EST SAT MAR 17 1990

THE NATIONAL WEATHER SERVICE IN CONCORD HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL 1245 AM EST FOR PEOPLE
IN THE FOLLOWING COUNTY...

IN NORTH NEW HAMPSHIRE
          ...COOS

THE AMMONOOSUC RIVER IS FLOODING ROUTE 110 IN GROVETON. THE STATE
HIGHWAY DEPARTMENT REPORTS THAT WATER UP TO 4 FEET DEEP IS FLOWING
OVER THE ROAD. THIS FLOODING MAY BE DUE TO AN ICE JAM SINCE ICE WAS
ALSO MOVING ONTO 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.  MOVE TO HIGHER GROUND.

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.