Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 35, NWS Gray, ME

July 17, 20185 counties in New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 17, 2018, 10:54 AM EDT for 5 counties in New Hampshire. It was in force for 66 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: Jul 17, 2018, 10:54 AM EDT (14:54 UTC)
Expired: Jul 17, 2018, 12:00 PM EDT
In force: 66 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Belknap County, NH, Hillsborough County, NH, Merrimack County, NH, Rockingham County, NH, Strafford County, NH

The radar

The Portland,ME radar (KGYX), 119 km from the middle of the area, began a volume at 14:55 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, 2.9 hours before the alert went out and 119 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: 320 J/kg
Mixed-layer CIN: -139 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

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 Jul 17, 9:03 AM EDT, 1 hour 51 minutes earlier.

Area forecast discussion, Jul 17, 9:03 AM EDT, 1 hour 51 minutes before

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Hazardous weather outlook, Jul 17, 9:05 AM EDT, 1 hour 49 minutes before

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In the hours before

Special weather statement, Jul 17, 6:01 AM EDT, 4 hours 53 minutes before

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Special weather statement, Jul 17, 7:26 AM EDT, 3 hours 28 minutes before

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Special weather statement, Jul 17, 7:28 AM EDT, 3 hours 26 minutes before

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Special weather statement, Jul 17, 9:35 AM EDT, 1 hour 19 minutes before

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Special weather statement, Jul 17, 10:02 AM EDT, 52 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 17, 2:58 AM EDT	Flash Flood Watch	GYX	York	14 hr
Jul 17, 6:01 AM EDT	Special Weather Statement	GYX	Franklin	59 min
Jul 17, 7:26 AM EDT	Special Weather Statement	GYX	Somerset	64 min
Jul 17, 11:20 AM EDT	Areal Flood Advisory	GYX	Franklin, Somerset	3 hr
Jul 17, 12:06 PM EDT	Severe Thunderstorm Warning	GYX	York	54 min
Jul 17, 12:25 PM EDT	Special Weather Statement	GYX	York	35 min
Jul 17, 12:27 PM EDT	Severe Thunderstorm Warning	GYX	York	48 min
Jul 17, 12:31 PM EDT	Special Marine Warning	GYX		59 min
Jul 17, 12:33 PM EDT	Areal Flood Advisory	GYX	York	117 min
Jul 17, 1:12 PM EDT	Special Marine Warning	GYX		63 min
Jul 17, 1:28 PM EDT	Special Marine Warning	GYX		92 min
Jul 17, 3:15 PM EDT	Areal Flood Advisory	GYX	York	2 hr
Jul 17, 6:39 PM EDT	Areal Flood Advisory	GYX	Somerset	3 hr
Jul 16, 10:00 PM EDT	Special Weather Statement	GYX	Cheshire	45 min
Jul 16, 10:46 PM EDT	Special Weather Statement	GYX	Cheshire	59 min
Jul 16, 11:46 PM EDT	Special Weather Statement	GYX	Hillsborough	59 min
Jul 17, 7:28 AM EDT	Special Weather Statement	GYX	Sullivan	47 min
Jul 17, 7:56 AM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack, Sullivan	37 min
Jul 17, 9:35 AM EDT	Special Weather Statement	GYX	Sullivan	40 min
Jul 17, 10:02 AM EDT	Special Weather Statement	GYX	Sullivan	43 min
Jul 17, 10:14 AM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack, Sullivan	61 min
Jul 17, 11:23 AM EDT	Special Weather Statement	GYX	Hillsborough	37 min
Jul 17, 11:34 AM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Merrimack, Rockingham	56 min
Jul 17, 11:42 AM EDT	Areal Flood Advisory	GYX	Cheshire, Hillsborough	3 hr
Jul 17, 11:58 AM EDT	Areal Flood Advisory	GYX	Hillsborough, Merrimack, Rockingham	2 hr
Jul 17, 12:04 PM EDT	Special Weather Statement	GYX	Hillsborough	26 min
Jul 17, 12:23 PM EDT	Flash Flood Warning	GYX	Cheshire, Hillsborough, Merrimack, Rockingham	3 hr
Jul 17, 12:29 PM EDT	Severe Thunderstorm Warning	GYX	Hillsborough, Rockingham	61 min
Jul 17, 3:11 PM EDT	Areal Flood Advisory	GYX	Cheshire, Hillsborough, Rockingham, Strafford	2 hr
Jul 17, 4:22 PM EDT	Special Weather Statement	GYX	Coos	23 min
Jul 17, 5:32 PM EDT	Special Weather Statement	GYX	Coos	28 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.