Alert archive / Maine / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 83, NWS Gray, ME

August 15, 2018Somerset County, Maine

NWS Gray, ME issued this severe thunderstorm warning at Aug 15, 2018, 3:09 PM EDT for Somerset County, Maine. 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: Aug 15, 2018, 3:09 PM EDT (19:09 UTC)
Expired: Aug 15, 2018, 3:49 PM EDT
In force: 40 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

County Somerset County, ME

The radar

The Caribou radar (KCBW), 177 km from the middle of the area, began a volume at 19:10 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

Caribou, ME (KCAR), launched 12:00Z, 7.2 hours before the alert went out and 213 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: 537 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 7 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 Aug 15, 1:29 PM EDT, 1 hour 40 minutes earlier.

Area forecast discussion, Aug 15, 1:29 PM EDT, 1 hour 40 minutes before

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Hazardous weather outlook, Aug 15, 3:06 AM EDT, 12 hours 3 minutes before

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In the hours before

Special weather statement, Aug 15, 1:18 PM EDT, 1 hour 51 minutes before

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Special weather statement, Aug 15, 1:55 PM EDT, 1 hour 14 minutes before

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Special weather statement, Aug 15, 3:07 PM EDT, 2 minutes before

Special Weather Statement
National Weather Service Gray ME
307 PM EDT WED AUG 15 2018

MEZ012-019-020-151945-
Southern Oxford-Androscoggin-Interior Cumberland-
307 PM EDT WED AUG 15 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN ANDROSCOGGIN AND NORTH
CENTRAL CUMBERLAND COUNTIES...

At 306 PM EDT, a strong thunderstorm was located near Mechanic Falls,
moving southeast at 20 mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Lewiston, Mechanic Falls, Turner, Lisbon, Greene, Durham, Bowdoin,
Hebron, New Gloucester, Sabattus, Minot, Poland, Pownal, Wales and
Oxford.

This includes Interstate 95 between mile markers 72 and 89.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

LAT...LON 4411 7001 4405 7003 4403 7002 4402 7004
      4401 7003 4389 7022 4415 7045 4427 7027
      4412 7002
TIME...MOT...LOC 1906Z 318DEG 17KT 4416 7030

ARNOTT

Special weather statement, Aug 15, 3:08 PM EDT, 1 minute before

Special Weather Statement
National Weather Service Gray ME
308 PM EDT WED AUG 15 2018

MEZ009-151945-
Central Somerset-
308 PM EDT WED AUG 15 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL SOMERSET COUNTY...

At 308 PM EDT, a strong thunderstorm was located 7 miles southwest of
Rockwood, or 14 miles northwest of Greenville, moving southeast at 30
mph.

Winds in excess of 30 mph and pea size hail are possible with this
storm.

Locations impacted include...
Rockwood Strip, Chase Stream, Misery Gore, Sandwich Academy Grant,
Taunton And Raynham Academy Grant, Brassua, Sapling, Indian Stream,
Misery, Long Pond, Tomhegan, Squaretown and Parlin Pond.

Torrential rainfall is also occurring with this storm, and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

LAT...LON 4569 6978 4567 6974 4566 6974 4565 6970
      4564 6971 4562 6970 4561 6971 4558 6971
      4557 6973 4555 6975 4554 6978 4541 6974
      4560 7013 4573 6980
TIME...MOT...LOC 1908Z 301DEG 26KT 4558 6983

ARNOTT

The office that day

Everything else NWS Gray, ME issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 15, 1:18 PM EDT	Special Weather Statement	GYX	Franklin	42 min
Aug 15, 1:55 PM EDT	Special Weather Statement	GYX	Franklin	65 min
Aug 15, 3:07 PM EDT	Special Weather Statement	GYX	Androscoggin	38 min
Aug 15, 3:08 PM EDT	Special Weather Statement	GYX	Somerset	37 min
Aug 15, 3:46 PM EDT	Special Weather Statement	GYX	Kennebec	44 min

Nearby

Severe Thunderstorm Warnings in Maine, 2018 Every severe thunderstorm warning in 2018

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.