Alert archive / New Hampshire / Flash Flood Warnings in 2023

Flash Flood Warning 85, NWS Gray, ME

December 18, 2023Carroll County, Coos County, Grafton County, New Hampshire

NWS Gray, ME issued this flash flood warning at Dec 18, 2023, 6:01 AM EST for Carroll County, Coos County, Grafton County, New Hampshire. It was in force for 13 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
Dec 18, 2023, 6:01 AM EST (11:01 UTC)
Expired
Dec 18, 2023, 7:00 PM EST
In force
13 hr
Issued by
NWS Gray, ME
Area
Storm-based polygon
Flood severity
None

Counties Carroll County, NH, Coos County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 100 km from the middle of the area, began a volume at 11:01 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

Albany, NY (KALY), launched 00:00Z, 11.0 hours before the alert went out and 253 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, Albany, NY at 00:00Z on 2023-12-18Temperature 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, Albany, NY at 00:00Z on 2023-12-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 403 square meters per square second.1939587897117Sfc1 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
481 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
403 m²/s²
0-3 km storm-relative helicity
505 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Gray, ME wrote its last area forecast discussion before this flash flood warning went out at Dec 18, 3:32 AM EST, 2 hours 29 minutes earlier.

Area forecast discussion, Dec 18, 3:32 AM EST, 2 hours 29 minutes before
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Hazardous weather outlook, Dec 18, 3:18 AM EST, 2 hours 43 minutes before
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      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

IssuedProductOfficeCountiesLasted
Dec 18, 6:49 AM ESTFlash Flood WarningGYXFranklin, Oxford18 hr
Dec 18, 6:57 AM ESTRiver Flood WarningGYXOxford29 hr
Dec 18, 6:57 AM ESTRiver Flood WarningGYXFranklin, Somerset38 hr
Dec 18, 6:57 AM ESTRiver Flood WarningGYXFranklin, Somerset40 hr
Dec 18, 7:54 AM ESTAreal Flood AdvisoryGYXAndroscoggin, Cumberland, Kennebec, Knox, Lincoln, Oxford and 1 more3 hr
Dec 18, 8:19 AM ESTAreal Flood AdvisoryGYXYork4 hr
Dec 18, 8:59 AM ESTFlash Flood WarningGYXSomerset5 hr
Dec 18, 9:14 AM ESTRiver Flood WarningGYXCumberland, Oxford29 hr
Dec 18, 9:42 AM ESTAreal Flood WarningGYXAndroscoggin, Cumberland, Kennebec, Knox, Lincoln, Oxford and 3 more9 hr
Dec 18, 10:25 AM ESTHurricane Force Wind WarningGYX9 hr
Dec 18, 11:48 AM ESTRiver Flood WarningGYXAndroscoggin, Franklin, Oxford49 hr
Dec 18, 11:48 AM ESTRiver Flood WarningGYXAndroscoggin, Cumberland, Sagadahoc72 hr
Dec 18, 12:34 PM ESTRiver Flood WarningGYXKennebec, Somerset4 days
Dec 18, 12:34 PM ESTRiver Flood WarningGYXKennebec66 hr
Dec 18, 12:34 PM ESTRiver Flood WarningGYXKennebec3 days
Dec 18, 12:34 PM ESTRiver Flood WarningGYXKennebec, Sagadahoc66 hr
Dec 18, 2:10 PM ESTRiver Flood WarningGYXOxford3 days
Dec 18, 2:38 PM ESTAreal Flood WarningGYXFranklin, Oxford, Somerset9 hr
Dec 18, 4:03 PM ESTRiver Flood WarningGYXCumberland20 hr
Dec 18, 6:37 PM ESTWind AdvisoryGYXCumberland, Kennebec, Knox, Lincoln, Sagadahoc, Waldo3 hr
Dec 18, 6:05 AM ESTRiver Flood WarningGYXGrafton22 hr
Dec 18, 9:13 AM ESTRiver Flood WarningGYXBelknap, Merrimack21 days
Dec 18, 9:34 AM ESTAreal Flood WarningGYXBelknap, Carroll, Cheshire, Grafton, Hillsborough, Merrimack and 3 more9 hr
Dec 18, 9:44 AM ESTRiver Flood WarningGYXHillsborough13 hr
Dec 18, 11:38 AM ESTSpecial Weather StatementGYXRockingham37 min
Dec 18, 2:12 PM ESTRiver Flood WarningGYXBelknap, Grafton, Merrimack6 hr
Dec 18, 2:13 PM ESTRiver Flood WarningGYXHillsborough23 hr
Dec 18, 2:40 PM ESTRiver Flood WarningGYXGrafton8 hr

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.