Alert archive / New Hampshire / Flash Flood Warnings in 2023
Flash Flood Warning 7, NWS Gray, ME
NWS Gray, ME issued this flash flood warning at Jun 17, 2023, 1:45 PM EDT for Grafton County, Merrimack County, Sullivan County, New Hampshire. It was in force for 3 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 17, 2023, 1:45 PM EDT (17:45 UTC)
- Expired
- Jun 17, 2023, 4:45 PM EDT
- In force
- 3 hr
- Issued by
- NWS Gray, ME
- Area
- Storm-based polygon
- Flood severity
- None
Counties Grafton County, NH, Merrimack County, NH, Sullivan County, NH
The radar
The Portland,ME radar (KGYX), 139 km from the middle of the area, began a volume at 17:46 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, 5.8 hours before the alert went out and 138 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.
- Mixed-layer CAPE
- 2 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 803 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 97 m²/s²
- 0-3 km storm-relative helicity
- 62 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Gray, ME issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 3:01 AM EDT | Small Craft Advisory | GYX | 33 hr | |
| Jun 17, 6:43 AM EDT | Flood Watch | GYX | Androscoggin, Cumberland, Franklin, Kennebec, Knox, Lincoln and 5 more | 14 hr |
| Jun 17, 10:46 AM EDT | Areal Flood Advisory | GYX | Cumberland, York | 4 hr |
| Jun 17, 5:33 PM EDT | Areal Flood Warning | GYX | Cumberland, York | 3 hr |
| Jun 17, 9:35 AM EDT | Areal Flood Advisory | GYX | Cheshire, Sullivan | 4 hr |
| Jun 17, 11:29 AM EDT | Areal Flood Advisory | GYX | Cheshire, Grafton, Hillsborough, Merrimack, Sullivan | 4 hr |
| Jun 17, 2:06 PM EDT | Flash Flood Warning | GYX | Grafton, Sullivan | 3 hr |
| Jun 17, 2:27 PM EDT | Areal Flood Advisory | GYX | Grafton, Hillsborough, Merrimack, Sullivan | 3 hr |
| Jun 17, 3:14 PM EDT | Areal Flood Advisory | GYX | Cheshire, Hillsborough, Merrimack, Sullivan | 3 hr |
| Jun 17, 5:26 PM EDT | Areal Flood Warning | GYX | Cheshire, Grafton, Merrimack, Sullivan | 3 hr |
| Jun 17, 5:51 PM EDT | Areal Flood Advisory | GYX | Cheshire, Hillsborough, Merrimack, Sullivan | 3 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.