Alert archive / New Hampshire / Flash Flood Warnings in 1990

Flash Flood Warning 10, NWS Gray, ME

August 11, 1990Merrimack County, New Hampshire

NWS Gray, ME issued this flash flood warning at Aug 11, 1990, 11:57 AM EDT for Merrimack County, New Hampshire. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Aug 11, 1990, 11:57 AM EDT (15:57 UTC)
Expired
Aug 11, 1990, 4:00 PM EDT
In force
4 hr
Issued by
NWS Gray, ME
Area
Whole counties

County Merrimack 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, 4.0 hours before the alert went out and 132 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 1990-08-11Temperature 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 12:00Z on 1990-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
3606 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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, 12:29 AM EDTFlash Flood WarningGYXGrafton5 hr
Aug 11, 10:07 AM EDTFlash Flood WarningGYXHillsborough4 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.