Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 71, NWS Gray, ME

July 19, 2013Carroll County, Coos County, Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 19, 2013, 8:37 PM EDT for Carroll County, Coos County, Grafton County, New Hampshire. It was in force for 23 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 19, 2013, 8:37 PM EDT (00:37 UTC)
Expired: Jul 19, 2013, 9:00 PM EDT
In force: 23 min
Issued by: NWS Gray, ME
Area: Storm-based polygon

Counties Carroll County, NH, Coos County, NH, Grafton County, NH

The radar

The Portland,ME radar (KGYX), 100 km from the middle of the area, began a volume at 00:39 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
Jul 19, 4:10 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Gray, ME (KGYX), launched 00:00Z, 0.6 hours before the alert went out and 99 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: 1670 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 1652 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 209 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 8.2

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 19, 7:00 PM EDT, 1 hour 37 minutes earlier.

Area forecast discussion, Jul 19, 7:00 PM EDT, 1 hour 37 minutes before

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Hazardous weather outlook, Jul 19, 7:00 PM EDT, 1 hour 37 minutes before

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In the hours before

Special weather statement, Jul 19, 5:09 PM EDT, 3 hours 28 minutes before

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Local storm report, Jul 19, 6:36 PM EDT, 2 hours 1 minute before

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Special weather statement, Jul 19, 6:39 PM EDT, 1 hour 58 minutes before

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Local storm report, Jul 19, 8:14 PM EDT, 23 minutes before

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Local storm report, Jul 19, 8:16 PM EDT, 21 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 19, 8:12 PM EDT	Severe Thunderstorm Warning	GYX	Somerset	33 min
Jul 19, 8:15 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford	45 min
Jul 19, 8:56 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Franklin, Kennebec, Oxford, Somerset	34 min
Jul 19, 9:26 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Franklin, Kennebec, Knox, Lincoln, Oxford and 2 more	49 min
Jul 19, 9:44 PM EDT	Severe Thunderstorm Warning	GYX	Oxford, York	46 min
Jul 19, 9:55 PM EDT	Special Weather Statement	GYX	Androscoggin	50 min
Jul 19, 10:13 PM EDT	Special Weather Statement	GYX	Waldo	62 min
Jul 20, 12:27 AM EDT	Special Weather Statement	GYX	Cumberland	48 min
Jul 20, 2:30 PM EDT	Special Marine Warning	GYX		90 min
Jul 20, 3:07 PM EDT	Severe Thunderstorm Warning	GYX	Oxford	53 min
Jul 20, 3:22 PM EDT	Special Marine Warning	GYX		53 min
Jul 20, 3:46 PM EDT	Special Weather Statement	GYX	Waldo	29 min
Jul 20, 4:05 PM EDT	Special Weather Statement	GYX	Kennebec	40 min
Jul 20, 4:36 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Franklin, Kennebec, Knox, Lincoln, Somerset and 1 more	54 min
Jul 20, 5:21 PM EDT	Severe Thunderstorm Warning	GYX	Knox, Lincoln, Waldo	24 min
Jul 20, 5:27 PM EDT	Special Marine Warning	GYX		63 min
Jul 19, 9:03 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Coos, Grafton	42 min
Jul 19, 10:53 PM EDT	Special Weather Statement	GYX	Sullivan	52 min
Jul 19, 11:06 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Sullivan	39 min
Jul 19, 11:17 PM EDT	Areal Flood Advisory	GYX	Merrimack, Sullivan	118 min
Jul 19, 11:39 PM EDT	Special Weather Statement	GYX	Belknap, Merrimack, Strafford	66 min
Jul 19, 11:51 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack, Rockingham, Strafford	39 min
Jul 20, 12:03 AM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Merrimack, Strafford	42 min
Jul 20, 2:04 PM EDT	Special Weather Statement	GYX	Rockingham	26 min
Jul 20, 2:20 PM EDT	Severe Thunderstorm Warning	GYX	Coos	55 min
Jul 20, 3:32 PM EDT	Special Weather Statement	GYX	Coos	28 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2013 Every severe thunderstorm warning in 2013

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.