Alert archive / New Hampshire / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 150, NWS Gray, ME

October 7, 2020Hillsborough County, Rockingham County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Oct 7, 2020, 5:30 PM EDT for Hillsborough County, Rockingham County, New Hampshire. It was in force for 45 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: Oct 7, 2020, 5:30 PM EDT (21:30 UTC)
Expired: Oct 7, 2020, 6:15 PM EDT
In force: 45 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Hillsborough County, NH, Rockingham County, NH

The radar

The Boston radar (KBOX), 113 km from the middle of the area, began a volume at 21:33 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

Chatham, MA (KCHH), launched 12:00Z, 9.5 hours before the alert went out and 185 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: 899 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 77 m²/s²
0-3 km storm-relative helicity: 172 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Oct 7, 3:56 PM EDT, 1 hour 34 minutes earlier.

Area forecast discussion, Oct 7, 3:56 PM EDT, 1 hour 34 minutes before

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Hazardous weather outlook, Oct 7, 4:57 AM EDT, 12 hours 33 minutes before

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In the hours before

Special weather statement, Oct 7, 4:23 PM EDT, 1 hour 7 minutes before

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Special weather statement, Oct 7, 4:59 PM EDT, 31 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
Oct 7, 4:09 AM EDT	Gale Warning	GYX		39 hr
Oct 7, 4:09 AM EDT	Small Craft Advisory	GYX		17 hr
Oct 7, 4:12 AM EDT	Wind Advisory	GYX	Androscoggin, Cumberland, Oxford, Sagadahoc, York	17 hr
Oct 7, 5:11 PM EDT	Severe Thunderstorm Warning	GYX	York	49 min
Oct 7, 5:37 PM EDT	Severe Thunderstorm Warning	GYX	York	18 min
Oct 7, 5:50 PM EDT	Special Marine Warning	GYX		55 min
Oct 7, 6:39 PM EDT	Special Weather Statement	GYX	Kennebec	51 min
Oct 7, 4:20 PM EDT	Fire Weather Watch	GYX		11 hr
Oct 7, 4:39 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire	51 min
Oct 7, 4:59 PM EDT	Special Weather Statement	GYX	Strafford	31 min
Oct 7, 4:59 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough	46 min

Nearby

Severe Thunderstorm Warnings in New Hampshire, 2020 Every severe thunderstorm warning in 2020

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.