Alert archive / New Hampshire / Flash Flood Warnings in 2023

Flash Flood Warning 82, NWS Gray, ME

September 11, 2023Carroll County, New Hampshire

NWS Gray, ME issued this flash flood warning at Sep 11, 2023, 5:37 PM EDT for Carroll County, New Hampshire. It was in force for 113 min. 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 11, 2023, 5:37 PM EDT (21:37 UTC)
Expired
Sep 11, 2023, 7:30 PM EDT
In force
113 min
Issued by
NWS Gray, ME
Area
Storm-based polygon
Flood severity
None

County Carroll County, NH

The radar

The Portland,ME radar (KGYX), 76 km from the middle of the area, began a volume at 21:40 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, 9.6 hours before the alert went out and 76 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 2023-09-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 52 joules per kilogram.LCLLFCEL10008507005003002001001 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 2023-09-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
52 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
540 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
63 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 11, 5:41 PM EDTAreal Flood AdvisoryGYXCumberland, Oxford, York2 hr
Sep 11, 6:29 PM EDTAreal Flood AdvisoryGYXKnox, Lincoln, Waldo4 hr
Sep 11, 7:24 PM EDTAreal Flood AdvisoryGYXYork111 min
Sep 11, 6:17 PM EDTFlash Flood WarningGYXHillsborough, Rockingham3 hr
Sep 11, 7:44 PM EDTAreal Flood AdvisoryGYXCheshire, Hillsborough, Merrimack, Rockingham106 min

Nearby

Flash Flood Warnings in New Hampshire, 2023Every flash flood warning in 2023

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.