Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 87, NWS Gray, ME

September 15, 2021Franklin County, Oxford County, Maine; Coos County, New Hampshire

NWS Gray, ME issued this severe thunderstorm warning at Sep 15, 2021, 2:33 PM EDT for Franklin County, Oxford County, Maine; Coos County, New Hampshire. It was in force for 42 min. 1 report 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, 2:33 PM EDT (18:33 UTC)
Expired: Sep 15, 2021, 3:15 PM EDT
In force: 42 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Franklin County, ME, Oxford County, ME, Coos County, NH

The radar

The Portland,ME radar (KGYX), 115 km from the middle of the area, began a volume at 18:34 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, 2:40 PM EDT	HAIL 1.25	7 Se Errol, NH

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, 6.6 hours before the alert went out and 115 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.

513 
WUUS51 KGYX 151833
SVRGYX
MEC007-017-NHC007-151915-
/O.NEW.KGYX.SV.W.0087.210915T1833Z-210915T1915Z/

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

The National Weather Service in Gray Maine has issued a

* Severe Thunderstorm Warning for...
  Northwestern Oxford County in western Maine...
  West central Franklin County in western Maine...
  East central Coos County in northern New Hampshire...

* Until 315 PM EDT.

* At 232 PM EDT, a severe thunderstorm was located near Errol, or 15
  miles north of Berlin, moving northeast at 50 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Rangeley, Errol, Weld, Dallas Plantation, Dummer, Magalloway
  Plantation, Lang, Adamstown, Richardsontown, South Arm, Sandy River
  Plantation, Upton, Rangeley Plantation, Wentworth Location, Lincoln
  Plantation, Madrid, Redington, Coplin Plantation, Lower Cupsuptic
  and Davis.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4462 7118 4473 7127 4493 7100 4513 7056
      4490 7039 4466 7100
TIME...MOT...LOC 1832Z 240DEG 45KT 4471 7111 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MEC

2 follow-up statements

132 
WWUS51 KGYX 151857
SVSGYX

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

NHC007-151906-
/O.CAN.KGYX.SV.W.0087.000000T0000Z-210915T1915Z/
Coos NH-
257 PM EDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL COOS COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 800 PM EDT for
western Maine.

LAT...LON 4468 7096 4476 7103 4510 7056 4490 7039
TIME...MOT...LOC 1856Z 240DEG 45KT 4486 7073 

$$

MEC007-017-151915-
/O.CON.KGYX.SV.W.0087.000000T0000Z-210915T1915Z/
Oxford ME-Franklin ME-
257 PM EDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHWESTERN OXFORD AND WEST CENTRAL FRANKLIN COUNTIES...

At 256 PM EDT, a severe thunderstorm was located 8 miles southwest of
Rangeley, moving northeast at 50 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Rangeley, Weld, Dallas Plantation, Sandy River Plantation,
Richardsontown, Rangeley Plantation, South Arm, Lang, Madrid,
Redington, Upton and Magalloway Plantation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

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

&&

LAT...LON 4468 7096 4476 7103 4510 7056 4490 7039
TIME...MOT...LOC 1856Z 240DEG 45KT 4486 7073 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Legro

712 
WWUS51 KGYX 151906
SVSGYX

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

MEC007-017-151915-
/O.CON.KGYX.SV.W.0087.000000T0000Z-210915T1915Z/
Oxford ME-Franklin ME-
306 PM EDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM EDT
FOR NORTHERN OXFORD AND WEST CENTRAL FRANKLIN COUNTIES...

At 306 PM EDT, a severe thunderstorm was located near Rangeley,
moving northeast at 50 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Weld, South Arm, Sandy River Plantation, Madrid, Richardsontown and
Rangeley Plantation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter, such as an interior room,
a bathroom or closet or basement.

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

&&

LAT...LON 4471 7087 4482 7088 4493 7044 4490 7039
TIME...MOT...LOC 1906Z 240DEG 45KT 4492 7057 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

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, 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, 5:14 PM EDT	Severe Thunderstorm Warning	GYX	Androscoggin, Cumberland, Kennebec, Oxford, Sagadahoc	46 min
Sep 15, 5:29 PM EDT	Severe Thunderstorm Warning	GYX	Cumberland, Oxford, York	61 min
Sep 15, 7:50 AM EDT	Special Weather Statement	GYX	Coos	55 min
Sep 15, 2:18 PM EDT	Severe Thunderstorm Warning	GYX	Coos, Grafton	57 min
Sep 15, 2:31 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Coos, Grafton, Merrimack, Sullivan	59 min
Sep 15, 3:04 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Grafton, Merrimack, Sullivan	56 min
Sep 15, 3:22 PM EDT	Severe Thunderstorm Warning	GYX	Belknap, Carroll, Coos, Grafton, Merrimack, Sullivan	53 min
Sep 15, 4:07 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack, Sullivan	38 min
Sep 15, 5:09 PM EDT	Severe Thunderstorm Warning	GYX	Cheshire, Hillsborough, Merrimack	51 min

Nearby

Severe Thunderstorm Warnings in Maine, 2021 Severe Thunderstorm Warnings in New Hampshire, 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.