Alert archive / New Hampshire / Flash Flood Warnings in 1997

Flash Flood Warning 9, NWS Gray, ME

July 9, 19974 counties in New Hampshire

NWS Gray, ME issued this flash flood warning at Jul 9, 1997, 2:45 PM EDT for 4 counties in New Hampshire. It was in force for 3 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: Jul 9, 1997, 2:45 PM EDT (18:45 UTC)
Expired: Jul 9, 1997, 5:45 PM EDT
In force: 3 hr
Issued by: NWS Gray, ME
Area: Whole counties

Counties Belknap County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 109 km from the middle of the area, began a volume at 18:44 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 12:00Z, 6.8 hours before the alert went out and 108 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 76 J/kg
Mixed-layer CIN: -183 J/kg
Mixed-layer LCL: 824 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 202 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 091844
FFWPWM
NHC001-013-015-017-092145-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GRAY ME
245 PM EDT WED JUL 9 1997

THE NATIONAL WEATHER SERVICE IN GRAY ME HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 545 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN CENTRAL NEW HAMPSHIRE

   ...SOUTHERN BELKNAP COUNTY
   ...SOUTHERN MERRIMACK COUNTY
   ...STRAFFORD COUNTY

IN SOUTHEASTERN NEW HAMPSHIRE

   ...ROCKINGHAM COUNTY
 
DOPPLER RADAR AND SURFACE REPORTS INDICATE A LINE OF THUNDERSTORMS
ACCOMPANIED BY TORRENTIAL RAIN MOVING ACROSS PARTS OF CENTRAL AND
SOUTHERN NEW HAMPSHIRE.  THESE THUNDERSTORMS ARE CAPABLE OF
PRODUCING OVER 2 INCHES OF RAIN PER HOUR.
 
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.

!LULOFS/HAWLEY

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 4:56 PM EDT	Flash Flood Warning	GYX	Belknap, Merrimack, Rockingham, Strafford	3 hr

Nearby

Flash Flood Warnings in New Hampshire, 1997 Every flash flood warning in 1997

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.