Alert archive / Maine / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 145, NWS Gray, ME

August 25, 2020Knox County, Waldo County, Maine

NWS Gray, ME issued this severe thunderstorm warning at Aug 25, 2020, 4:27 PM EDT for Knox County, Waldo County, Maine. It was in force for 36 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: Aug 25, 2020, 4:27 PM EDT (20:27 UTC)
Expired: Aug 25, 2020, 5:03 PM EDT
In force: 36 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Knox County, ME, Waldo County, ME

The radar

The Portland,ME radar (KGYX), 100 km from the middle of the area, began a volume at 20:30 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
Aug 25, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Chatham, MA (KCHH), launched 12:00Z, 8.5 hours before the alert went out and 298 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: 509 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 1195 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 60 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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 Aug 25, 3:57 PM EDT, 30 minutes earlier.

Area forecast discussion, Aug 25, 3:57 PM EDT, 30 minutes before

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Hazardous weather outlook, Aug 25, 3:21 PM EDT, 1 hour 6 minutes before

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In the hours before

Local storm report, Aug 25, 3:50 PM EDT, 37 minutes before

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Local storm report, Aug 25, 4:09 PM EDT, 18 minutes before

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Local storm report, Aug 25, 4:14 PM EDT, 13 minutes before

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Local storm report, Aug 25, 4:20 PM EDT, 7 minutes before

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Local storm report, Aug 25, 4:21 PM EDT, 6 minutes before

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Local storm report, Aug 25, 4:22 PM EDT, 5 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
Aug 24, 11:38 PM EDT	Dense Fog Advisory	GYX	Androscoggin, Cumberland, Franklin, Kennebec, Knox, Lincoln and 5 more	8 hr
Aug 25, 8:32 AM EDT	Special Weather Statement	GYX	Somerset	28 min
Aug 25, 11:47 AM EDT	Special Weather Statement	GYX	Waldo	28 min
Aug 25, 2:15 PM EDT	Special Weather Statement	GYX	Kennebec	30 min
Aug 25, 2:17 PM EDT	Special Weather Statement	GYX	Kennebec	28 min
Aug 25, 2:30 PM EDT	Special Weather Statement	GYX	Androscoggin	30 min
Aug 25, 2:34 PM EDT	Severe Thunderstorm Warning	GYX	Kennebec, Somerset, Waldo	41 min
Aug 25, 2:48 PM EDT	Severe Thunderstorm Warning	GYX	Kennebec	42 min
Aug 25, 2:55 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Oxford	35 min
Aug 25, 3:15 PM EDT	Severe Thunderstorm Warning	GYX	Waldo	30 min
Aug 25, 3:21 PM EDT	Severe Thunderstorm Warning	GYX	Kennebec, Sagadahoc	24 min
Aug 25, 3:29 PM EDT	Special Weather Statement	GYX	Waldo	46 min
Aug 25, 3:40 PM EDT	Severe Thunderstorm Warning	GYX	Knox, Lincoln, Waldo	50 min
Aug 25, 3:55 PM EDT	Severe Thunderstorm Warning	GYX	York	50 min
Aug 25, 4:03 PM EDT	Special Marine Warning	GYX		42 min
Aug 25, 4:05 PM EDT	Severe Thunderstorm Warning	GYX	Knox, Lincoln	40 min
Aug 25, 4:14 PM EDT	Severe Thunderstorm Warning	GYX	Knox, Lincoln	31 min
Aug 25, 4:16 PM EDT	Special Marine Warning	GYX		29 min
Aug 25, 4:23 PM EDT	Special Marine Warning	GYX		52 min
Aug 25, 4:29 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, York	31 min
Aug 25, 4:31 PM EDT	Special Marine Warning	GYX		59 min
Aug 25, 5:10 PM EDT	Special Marine Warning	GYX		65 min
Aug 24, 8:48 PM EDT	Special Weather Statement	GYX	Belknap	42 min
Aug 24, 9:27 PM EDT	Special Weather Statement	GYX	Carroll	33 min
Aug 25, 3:10 PM EDT	Special Weather Statement	GYX	Belknap	35 min
Aug 25, 3:32 PM EDT	Special Weather Statement	GYX	Carroll	28 min
Aug 25, 4:46 PM EDT	Special Weather Statement	GYX	Merrimack, Sullivan	29 min
Aug 25, 5:02 PM EDT	Special Weather Statement	GYX	Rockingham	13 min

Nearby

Severe Thunderstorm Warnings in Maine, 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.