Alert archive / New Hampshire / Flash Flood Watches in 2017

Flash Flood Watch 1, NWS Gray, ME

June 18, 2017Franklin County, Oxford County, Somerset County, Maine; 8 counties in New Hampshire

NWS Gray, ME issued this flash flood watch at Jun 18, 2017, 3:19 AM EDT for Franklin County, Oxford County, Somerset County, Maine; 8 counties in New Hampshire. It took effect at Jun 19, 2017, 2:00 PM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Jun 18, 2017, 3:19 AM EDT (07:19 UTC)
In effect from: Jun 19, 2017, 2:00 PM EDT
Expired: Jun 19, 2017, 8:01 PM EDT
In force: 6 hr
Issued by: NWS Gray, ME
Flood severity: None

Counties Franklin County, ME, Oxford County, ME, Somerset County, ME, Belknap County, NH, Carroll County, NH, Cheshire County, NH, Coos County, NH, Grafton County, NH, Hillsborough County, NH, Merrimack County, NH, Sullivan County, NH

The radar

The Portland,ME radar (KGYX), 87 km from the middle of the area, began a volume at 07:21 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, 7.3 hours before the alert went out and 245 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 235 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1046 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Jun 18, 12:15 AM EDT, 3 hours 4 minutes earlier.

Area forecast discussion, Jun 18, 12:15 AM EDT, 3 hours 4 minutes before

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Nearby

Flash Flood Watches in New Hampshire, 2017 Flash Flood Watches in Maine, 2017 Every flash flood watch in 2017

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.