Alert archive / New Hampshire / Flash Flood Warnings in 2022

Flash Flood Warning 4, NWS Gray, ME

September 4, 2022Belknap County, Merrimack County, New Hampshire

NWS Gray, ME issued this flash flood warning at Sep 4, 2022, 8:40 PM EDT for Belknap County, Merrimack County, New Hampshire. It was in force for 2 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
Sep 4, 2022, 8:40 PM EDT (00:40 UTC)
Expired
Sep 4, 2022, 10:45 PM EDT
In force
2 hr
Issued by
NWS Gray, ME
Area
Storm-based polygon
Flood severity
None

Counties Belknap County, NH, Merrimack County, NH

The radar

The Portland,ME radar (KGYX), 117 km from the middle of the area, began a volume at 00:41 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, 0.7 hours before the alert went out and 117 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 2022-09-05Temperature 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 2022-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -36 square meters per square second.193958Sfc1 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
970 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-36 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 4, 10:23 PM EDTAreal Flood AdvisoryGYXCumberland, Oxford3 hr
Sep 5, 3:24 AM EDTFlood WatchGYXAndroscoggin, Cumberland, Kennebec, Knox, Lincoln, Oxford and 2 more32 hr
Sep 5, 12:37 PM EDTAreal Flood AdvisoryGYXFranklin, Oxford, Somerset113 min
Sep 5, 4:03 PM EDTAreal Flood AdvisoryGYXCumberland, Oxford3 hr
Sep 4, 8:01 PM EDTAreal Flood AdvisoryGYXCheshire59 min
Sep 4, 8:33 PM EDTAreal Flood AdvisoryGYXBelknap, Merrimack117 min
Sep 4, 8:56 PM EDTSpecial Weather StatementGYXMerrimack49 min

Nearby

Flash Flood Warnings in New Hampshire, 2022Every flash flood warning in 2022

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.