Alert archive / New Hampshire / Flash Flood Warnings in 1998

Flash Flood Warning 3, NWS Gray, ME

March 31, 1998Coos County, New Hampshire

NWS Gray, ME issued this flash flood warning at Mar 31, 1998, 2:13 AM EST for Coos County, New Hampshire. It was in force for 4 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Mar 31, 1998, 2:13 AM EST (07:13 UTC)
Expired
Mar 31, 1998, 6:00 AM EST
In force
4 hr
Issued by
NWS Gray, ME
Area
Whole counties

County Coos County, NH

The radar

The Portland,ME radar (KGYX), 122 km from the middle of the area, began a volume at 07:13 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 7.2 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 1998-03-31Temperature 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 1998-03-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 351 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
2041 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
351 m²/s²
0-3 km storm-relative helicity
473 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 KPWM 310712
FFWPWM
NHC007-311100-

BULLETIN - EAS ACTIVATION REQUESTED
FLOOD WARNING
NATIONAL WEATHER SERVICE GRAY ME
213 AM EST TUE MAR 31 1998

THE NATIONAL WEATHER SERVICE IN GRAY ME HAS ISSUED A
FLOOD WARNING EFFECTIVE UNTIL 600 AM EST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN NORTHERN NEW HAMPSHIRE

   ...COOS COUNTY
 
NATIONAL WEATHER SERVICE DOPPLER RADAR SHOWS SCATTERED SHOWER AND
THUNDERSTORM ACTIVITY MOVING ACROSS AREAS THAT RECEIVED MORE THAN
AN INCH OF RAIN LAST NIGHT.  WHILE THE RAIN WILL BE LIGHTER THAN
THE EARLIER SHOWERS AND THUNDERSTORMS...ANY HEAVIER SHOWER COULD
PUT DOWN AN ADDITIONAL HALF INCH OR RAIN. THIS WILL EXACERBATE
FLOODING PROBLEMS ON ALREADY SWOLLEN SMALL RIVERS AND STREAMS IN THE
REGION.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE 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.  IF
FLOODWATERS THREATEN YOUR  HOME OR BUSINESS...MOVE TO HIGHER GROUND.

HAYES

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 30, 8:09 PM ESTFlash Flood WarningGYXCoos6 hr

Nearby

Flash Flood Warnings in New Hampshire, 1998Every flash flood warning in 1998

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; radar from the NEXRAD Level II archive.