Alert archive / Maine / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 78, NWS Gray, ME

August 7, 20184 counties in Maine

NWS Gray, ME issued this severe thunderstorm warning at Aug 7, 2018, 3:01 PM EDT for 4 counties in Maine. It was in force for 48 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 7, 2018, 3:01 PM EDT (19:01 UTC)
Expired
Aug 7, 2018, 3:49 PM EDT
In force
48 min
Issued by
NWS Gray, ME
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Androscoggin County, ME, Franklin County, ME, Kennebec County, ME, Oxford County, ME

The radar

The Portland,ME radar (KGYX), 69 km from the middle of the area, began a volume at 19:03 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 12:00Z, 7.0 hours before the alert went out and 69 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-pSkew-T log-p diagram, Gray, ME at 12:00Z on 2018-08-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 117 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Gray, ME at 12:00Z on 2018-08-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 42 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
117 J/kg
Mixed-layer CIN
-95 J/kg
Mixed-layer LCL
1663 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
42 m²/s²
0-3 km storm-relative helicity
98 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 7, 12:08 PM EDT, 2 hours 53 minutes earlier.

Area forecast discussion, Aug 7, 12:08 PM EDT, 2 hours 53 minutes before
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Hazardous weather outlook, Aug 7, 5:27 AM EDT, 9 hours 34 minutes before
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In the hours before

Special weather statement, Aug 7, 11:50 AM EDT, 3 hours 11 minutes before
Special Weather Statement
National Weather Service Gray ME
1150 AM EDT TUE AUG 7 2018

MEZ009-071615-
Central Somerset-
1150 AM EDT TUE AUG 7 2018

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

At 1149 AM EDT, a strong thunderstorm was located 8 miles south of
Rockwood, or 9 miles northwest of Greenville, moving northeast at 50
mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Rockwood, Sapling, Indian Stream, Chase Stream, Misery Gore, Misery,
Taunton And Raynham Academy Grant, Parlin Pond, Johnson Mountain,
Sandwich Academy Grant and West Fork Plantation.

If you are on or near Moosehead Lake, get out of the water and move
indoors or inside a vehicle. Remember, lightning can strike out to
10 miles from the parent thunderstorm. If you can hear thunder, you
are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.

LAT...LON 4565 6973 4566 6970 4564 6970 4563 6971
      4562 6970 4561 6971 4558 6971 4557 6973
      4555 6975 4554 6978 4547 6976 4543 7001
      4554 7004 4568 6974
TIME...MOT...LOC 1549Z 245DEG 45KT 4556 6973

Legro
Special weather statement, Aug 7, 2:12 PM EDT, 49 minutes before
Special Weather Statement
National Weather Service Gray ME
212 PM EDT TUE AUG 7 2018

NHZ007-011-015-071845-
Western And Central Hillsborough-Cheshire-Sullivan-
212 PM EDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN CHESHIRE AND
NORTHWESTERN HILLSBOROUGH COUNTIES...

At 212 PM EDT, a strong thunderstorm was located over Nelson, or 11
miles east of Keene, moving northeast at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Keene, Henniker, New Boston, Antrim, Greenfield, Francestown,
Bennington, Harrisville, Nelson, Windsor, Roxbury, Hancock, Deering,
Sullivan, Hillsborough, Gilsum, Weare, Marlborough and Washington.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4320 7191 4312 7186 4313 7177 4299 7168
      4291 7224 4303 7228
TIME...MOT...LOC 1812Z 246DEG 20KT 4301 7208

Legro
Special weather statement, Aug 7, 2:44 PM EDT, 17 minutes before
Special Weather Statement
National Weather Service Gray ME
244 PM EDT TUE AUG 7 2018

MEZ012-020-071915-
Southern Oxford-Androscoggin-
244 PM EDT TUE AUG 7 2018

...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL OXFORD AND NORTH
CENTRAL ANDROSCOGGIN COUNTIES...

At 243 PM EDT, a strong thunderstorm was located near Canton, or 11
miles southeast of Rumford, moving east at 25 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

Locations impacted include...
Turner, Dixfield, Canton, Leeds, Livermore, Hartford, Sumner, Peru,
Woodstock and West Paris.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4434 7017 4437 7054 4443 7054 4453 7029
      4451 7028 4450 7025 4446 7024 4447 7020
TIME...MOT...LOC 1843Z 260DEG 23KT 4441 7041

Legro

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 6, 9:13 PM EDTSpecial Weather StatementGYXOxford47 min
Aug 7, 11:50 AM EDTSpecial Weather StatementGYXSomerset25 min
Aug 7, 2:44 PM EDTSpecial Weather StatementGYXOxford31 min
Aug 7, 5:01 PM EDTSevere Thunderstorm WarningGYXAndroscoggin, Cumberland, Sagadahoc, York59 min
Aug 7, 5:31 PM EDTSpecial Weather StatementGYXFranklin29 min
Aug 7, 5:48 PM EDTSpecial Weather StatementGYXSagadahoc27 min
Aug 7, 6:08 PM EDTSpecial Weather StatementGYXLincoln, Sagadahoc37 min
Aug 7, 6:44 PM EDTSpecial Weather StatementGYXWaldo46 min
Aug 7, 7:15 PM EDTSevere Thunderstorm WarningGYXWaldo45 min
Aug 6, 8:10 PM EDTSpecial Weather StatementGYXCoos35 min
Aug 6, 8:26 PM EDTSpecial Weather StatementGYXCoos49 min
Aug 7, 2:12 PM EDTSpecial Weather StatementGYXCheshire33 min
Aug 7, 3:53 PM EDTSpecial Weather StatementGYXCoos37 min
Aug 7, 4:22 PM EDTSpecial Weather StatementGYXCarroll23 min
Aug 7, 6:40 PM EDTSpecial Weather StatementGYXHillsborough35 min
Aug 7, 7:24 PM EDTSpecial Weather StatementGYXRockingham36 min

Nearby

Severe Thunderstorm Warnings in Maine, 2018Every 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.