Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 1, NWS Gray, ME

May 4, 2018Coos County, Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at May 4, 2018, 8:12 PM EDT for Coos County, Grafton County, New Hampshire. It was in force for 78 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: May 4, 2018, 8:12 PM EDT (00:12 UTC)
Expired: May 4, 2018, 9:30 PM EDT
In force: 78 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Coos County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 114 km from the middle of the area, began a volume at 00:15 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 4, 6:20 PM EDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 0.2 hours before the alert went out and 114 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 512 m above ground
0-6 km bulk shear: 77 kt
0-1 km storm-relative helicity: 470 m²/s²
0-3 km storm-relative helicity: 561 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at May 4, 6:46 PM EDT, 1 hour 26 minutes earlier.

Area forecast discussion, May 4, 6:46 PM EDT, 1 hour 26 minutes before

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Hazardous weather outlook, May 4, 6:32 PM EDT, 1 hour 40 minutes before

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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.

Issued	Product	Office	Counties	Lasted
May 4, 8:46 PM EDT	Special Weather Statement	GYX	Franklin	29 min
May 4, 10:25 PM EDT	Special Weather Statement	GYX	Androscoggin	50 min
May 5, 8:04 AM EDT	River Flood Warning	GYX	Somerset	46 hr
May 4, 8:49 PM EDT	Areal Flood Advisory	GYX	Coos	116 min
May 4, 8:54 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	66 min
May 4, 9:09 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack, Sullivan	66 min
May 4, 9:20 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Coos	55 min
May 4, 9:48 PM EDT	Severe Thunderstorm Warning	GYX	Carroll, Grafton	57 min
May 4, 9:59 PM EDT	Special Weather Statement	GYX	Belknap, Hillsborough, Merrimack, Rockingham, Strafford	46 min
May 4, 10:06 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Merrimack, Strafford	32 min
May 4, 10:35 PM EDT	Special Weather Statement	GYX	Rockingham	40 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2018 Every severe thunderstorm warning in 2018

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.