Alert archive / New Hampshire / Flash Flood Warnings in 2025

Flash Flood Warning 2, NWS Gray, ME

June 6, 2025Hillsborough County, New Hampshire

NWS Gray, ME issued this flash flood warning at Jun 6, 2025, 5:37 PM EDT for Hillsborough 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
Jun 6, 2025, 5:37 PM EDT (21:37 UTC)
Expired
Jun 6, 2025, 7:56 PM EDT
In force
2 hr
Issued by
NWS Gray, ME
Area
Storm-based polygon
Flood severity
None

County Hillsborough County, NH

The radar

The Boston radar (KBOX), 117 km from the middle of the area, began a volume at 21:38 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 12:00Z, 9.6 hours before the alert went out and 174 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 12:00Z on 2025-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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, Albany, NY at 12:00Z on 2025-06-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
53 J/kg
Mixed-layer CIN
-201 J/kg
Mixed-layer LCL
789 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
77 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
Jun 6, 7:01 AM EDTFlood WatchGYXBelknap, Carroll, Cheshire, Grafton, Hillsborough, Merrimack and 3 more14 hr
Jun 6, 2:38 PM EDTSevere Thunderstorm WarningGYXHillsborough, Merrimack37 min
Jun 6, 3:05 PM EDTSevere Thunderstorm WarningGYXGrafton, Sullivan40 min
Jun 6, 3:12 PM EDTSevere Thunderstorm WarningGYXMerrimack48 min
Jun 6, 3:32 PM EDTSevere Thunderstorm WarningGYXMerrimack43 min
Jun 6, 4:15 PM EDTSevere Thunderstorm WarningGYXMerrimack45 min
Jun 6, 4:48 PM EDTSevere Thunderstorm WarningGYXHillsborough, Merrimack31 min
Jun 6, 4:53 PM EDTFlash Flood WarningGYXMerrimack3 hr

Nearby

Flash Flood Warnings in New Hampshire, 2025Every flash flood warning in 2025

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.