Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 97, NWS Gray, ME

July 9, 2007Grafton County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Jul 9, 2007, 1:35 PM EDT for Grafton County, New Hampshire. It was in force for 40 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 9, 2007, 1:35 PM EDT (17:35 UTC)
Expired: Jul 9, 2007, 2:15 PM EDT
In force: 40 min
Issued by: NWS Gray, ME
Area: Counties, with a storm outline in the text

County Grafton County, NH

The radar

The Burlington radar (KCXX), 125 km from the middle of the area, began a volume at 17:36 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 9, 11:18 AM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 5.6 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 798 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 9, 10:37 AM EDT, 2 hours 58 minutes earlier.

Area forecast discussion, Jul 9, 10:37 AM EDT, 2 hours 58 minutes before

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Hazardous weather outlook, Jul 9, 12:26 PM EDT, 1 hour 9 minutes before

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In the hours before

Special weather statement, Jul 9, 8:54 AM EDT, 4 hours 41 minutes before

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Special weather statement, Jul 9, 11:56 AM EDT, 1 hour 39 minutes before

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Special weather statement, Jul 9, 12:54 PM EDT, 41 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 9, 5:16 PM EDT	Special Marine Warning	GYX		59 min
Jul 9, 2:06 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	39 min
Jul 9, 2:43 PM EDT	Severe Thunderstorm Warning	GYX	Merrimack	17 min
Jul 9, 3:13 PM EDT	Severe Thunderstorm Warning	GYX	Rockingham	47 min
Jul 9, 6:28 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	47 min
Jul 9, 7:43 PM EDT	Severe Thunderstorm Warning	GYX	Carroll	47 min
Jul 9, 7:58 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Merrimack	47 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2007 Every severe thunderstorm warning in 2007

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.