Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 97, NWS Gray, ME

September 15, 20215 counties in Maine

NWS Gray, ME issued this severe thunderstorm warning at Sep 15, 2021, 5:14 PM EDT for 5 counties in Maine. It was in force for 46 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 15, 2021, 5:14 PM EDT (21:14 UTC)
Expired: Sep 15, 2021, 6:00 PM EDT
In force: 46 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Androscoggin County, ME, Cumberland County, ME, Kennebec County, ME, Oxford County, ME, Sagadahoc County, ME

The radar

The Portland,ME radar (KGYX), 40 km from the middle of the area, began a volume at 21:14 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.

What was reported inside it

Time	Report	Where	Remark
Sep 15, 5:15 PM EDT	TSTM WND DMG	Auburn, ME	MULTIPLE TREES DOWN REPORTED ACROSS THE LEWISTON/AUBURN AREA. TIME ESTIMATED BASED ON RADAR.
Sep 15, 5:41 PM EDT	TSTM WND DMG	Chelsea, ME	TREES DOWN, TIME ESTIMATED BY RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

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

Issued	Product	Office	Lasted
Sep 15, 1:15 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 9.2 hours before the alert went out and 40 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: 101 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 468 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 299 m²/s²
0-3 km storm-relative helicity: 318 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

429 
WUUS51 KGYX 152114
SVRGYX
MEC001-005-011-017-023-152200-
/O.NEW.KGYX.SV.W.0097.210915T2114Z-210915T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Gray ME
514 PM EDT Wed Sep 15 2021

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  Southern Kennebec County in south central Maine...
  East central Oxford County in western Maine...
  Androscoggin County in southwestern Maine...
  Central Cumberland County in southwestern Maine...
  Sagadahoc County in south central Maine...

* Until 600 PM EDT.

* At 514 PM EDT, severe thunderstorms were located along a line
  extending from 6 miles south of Livermore Falls to near Lewiston to
  near Gray to 6 miles northeast of Standish, moving east at 45 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Lewiston, Brunswick, Augusta, Bath, Gardiner, Mechanic Falls,
  Topsham, Turner, Wiscasset, Cumberland, Falmouth, Freeport, Gray,
  China, Litchfield, Belgrade, Livermore Falls, Farmingdale,
  Manchester and Hallowell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Gray Maine.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4427 6953 4426 6956 4428 6965 4423 6967
      4412 6966 4414 6976 4403 6981 4401 6970
      4389 6974 4382 6970 4375 6976 4383 6977
      4378 6980 4374 6980 4371 6976 4369 6985
      4383 7062 4415 7035 4445 7032 4444 6950
TIME...MOT...LOC 2114Z 277DEG 37KT 4439 7014 4409 7015 4390 7027 4379
7044

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.88 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Legro

1 follow-up statement

068 
WWUS51 KGYX 152159
SVSGYX

Severe Weather Statement
National Weather Service Gray ME
559 PM EDT Wed Sep 15 2021

MEC001-005-011-017-023-152209-
/O.EXP.KGYX.SV.W.0097.000000T0000Z-210915T2200Z/
Kennebec ME-Oxford ME-Androscoggin ME-Cumberland ME-Sagadahoc ME-
559 PM EDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN KENNEBEC...EAST
CENTRAL OXFORD...ANDROSCOGGIN...CENTRAL CUMBERLAND AND SAGADAHOC
COUNTIES WILL EXPIRE AT 600 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
south central and southwestern Maine.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Gray Maine.

LAT...LON 4427 6953 4426 6956 4428 6965 4423 6967
      4412 6966 4414 6976 4403 6981 4401 6970
      4389 6974 4382 6970 4375 6976 4383 6977
      4378 6980 4374 6980 4371 6976 4369 6985
      4383 7062 4415 7035 4445 7032 4444 6950
TIME...MOT...LOC 2159Z 277DEG 37KT 4434 6956 4404 6957 4385 6969 4374
6986

$$

Legro

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 2:33 AM EDT	Small Craft Advisory	GYX		19 hr
Sep 15, 6:56 AM EDT	Special Weather Statement	GYX	Franklin	64 min
Sep 15, 7:53 AM EDT	Special Weather Statement	GYX	Franklin	52 min
Sep 15, 9:00 AM EDT	Special Weather Statement	GYX	Franklin	45 min
Sep 15, 2:33 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford	42 min
Sep 15, 3:04 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford	41 min
Sep 15, 3:41 PM EDT	Severe Thunderstorm Warning	GYX	Franklin, Oxford, Somerset	49 min
Sep 15, 4:09 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford	51 min
Sep 15, 4:28 PM EDT	Tornado Warning	GYX	Cumberland, Oxford	32 min
Sep 15, 4:44 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	46 min
Sep 15, 4:58 PM EDT	Severe Thunderstorm Warning	GYX	Somerset	29 min
Sep 15, 5:29 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	61 min

Nearby

Severe Thunderstorm Warnings in Maine, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.