Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 69, NWS Gray, ME

July 20, 2015Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 20, 2015, 2:35 AM EDT for Grafton County, New Hampshire. It was in force for 55 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 20, 2015, 2:35 AM EDT (06:35 UTC)
Expired: Jul 20, 2015, 3:30 AM EDT
In force: 55 min
Issued by: NWS Gray, ME
Area: Storm-based polygon

County Grafton County, NH

The radar

The Burlington radar (KCXX), 125 km from the middle of the area, began a volume at 06:36 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 00:00Z, 6.6 hours before the alert went out and 125 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: 1337 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 851 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

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 20, 12:28 AM EDT, 2 hours 7 minutes earlier.

Area forecast discussion, Jul 20, 12:28 AM EDT, 2 hours 7 minutes before

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Hazardous weather outlook, Jul 20, 12:12 AM EDT, 2 hours 23 minutes before

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In the hours before

Local storm report, Jul 19, 10:07 PM EDT, 4 hours 28 minutes before

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Special weather statement, Jul 19, 10:17 PM EDT, 4 hours 18 minutes before

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Local storm report, Jul 19, 10:24 PM EDT, 4 hours 11 minutes before

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Local storm report, Jul 19, 10:35 PM EDT, 4 hours before

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Special weather statement, Jul 20, 12:59 AM EDT, 1 hour 36 minutes before

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Special weather statement, Jul 20, 2:16 AM EDT, 19 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, 8:10 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	55 min
Jul 19, 8:16 PM EDT	Severe Thunderstorm Warning	GYX	York	44 min
Jul 19, 8:18 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Kennebec, Somerset	57 min
Jul 19, 8:38 PM EDT	Areal Flood Advisory	GYX	Cumberland, Oxford, York	3 hr
Jul 19, 8:55 PM EDT	Severe Thunderstorm Warning	GYX	York	50 min
Jul 19, 9:09 PM EDT	Special Weather Statement	GYX	York	66 min
Jul 19, 9:15 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, York	45 min
Jul 19, 9:22 PM EDT	Special Marine Warning	GYX		53 min
Jul 19, 10:17 PM EDT	Special Weather Statement	GYX	Kennebec	43 min
Jul 20, 12:59 AM EDT	Special Weather Statement	GYX	Somerset	61 min
Jul 20, 3:57 AM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	29 min
Jul 19, 8:16 PM EDT	Flash Flood Warning	GYX	Grafton	3 hr
Jul 19, 8:52 PM EDT	Flash Flood Warning	GYX	Belknap, Carroll, Grafton, Strafford	5 hr
Jul 19, 9:11 PM EDT	Severe Thunderstorm Warning	GYX	Coos	49 min
Jul 20, 2:16 AM EDT	Special Weather Statement	GYX	Grafton	59 min
Jul 20, 3:18 AM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Grafton	42 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2015 Every severe thunderstorm warning in 2015

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.