Alert archive / Maine / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 28, NWS Gray, ME

June 20, 2020Somerset County, Maine

NWS Gray, ME issued this severe thunderstorm warning at Jun 20, 2020, 4:57 PM EDT for Somerset County, 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: Jun 20, 2020, 4:57 PM EDT (20:57 UTC)
Expired: Jun 20, 2020, 5:45 PM EDT
In force: 48 min
Issued by: NWS Gray, ME
Area: Storm-based polygon
Hail: 1.0 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 20:57 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, 9.0 hours before the alert went out and 182 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: 525 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1603 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 85 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 Jun 20, 3:55 PM EDT, 1 hour 2 minutes earlier.

Area forecast discussion, Jun 20, 3:55 PM EDT, 1 hour 2 minutes before

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Hazardous weather outlook, Jun 20, 3:23 PM EDT, 1 hour 34 minutes before

Hazardous Weather Outlook
National Weather Service Gray ME
323 PM EDT Sat Jun 20 2020

MEZ007>009-012>014-018>022-033-NHZ001>013-015-211930-
Northern Oxford-Northern Franklin-Central Somerset-Southern Oxford-
Southern Franklin-Southern Somerset-Interior York-
Central Interior Cumberland-Androscoggin-Kennebec-Interior Waldo-
Interior Cumberland Highlands-Northern Coos-Southern Coos-
Northern Grafton-Northern Carroll-Southern Grafton-Southern Carroll-
Sullivan-Merrimack-Belknap-Strafford-Cheshire-Eastern Hillsborough-
Interior Rockingham-Western And Central Hillsborough-
323 PM EDT Sat Jun 20 2020

This Hazardous Weather Outlook is for Maine, south central Maine,
southwest Maine, west central Maine, western Maine, New Hampshire,
central New Hampshire, northern New Hampshire and southern New
Hampshire.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Warm to hot conditions are expected through the rest of the weekend
and into next week. Several days of 90 degree heat are likely away
from the coast and mountains, leading to a build up of excess heat
in buildings with poor circulation.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

MEZ023>028-NHZ014-211930-
Coastal York-Coastal Cumberland-Sagadahoc-Lincoln-Knox-Coastal Waldo-
Coastal Rockingham-
323 PM EDT Sat Jun 20 2020

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 9 PM EDT THIS EVENING...

This Hazardous Weather Outlook is for south central Maine,
southwest Maine and southern New Hampshire.

.DAY ONE...This Afternoon and Tonight.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Beach Hazards Statement.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

ANZ150>154-170-172-174-211930-
Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM-
Penobscot Bay-
Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM-
Casco Bay-
Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out
25 NM-Waters from Stonington ME to Port Clyde ME from 25 to 40 nm-
Waters from Port Clyde ME to Cape Elizabeth ME from 25 to 40 nm-
Waters from Cape Elizabeth ME to Merrimack River MA from 25 to 40 nm-
323 PM EDT Sat Jun 20 2020

This Hazardous Weather Outlook is for Atlantic coastal waters.

.DAY ONE...This Afternoon and Tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

In the hours before

Special weather statement, Jun 20, 1:08 PM EDT, 3 hours 49 minutes before

Special Weather Statement
National Weather Service Gray ME
108 PM EDT Sat Jun 20 2020

NHZ005-008-201745-
Merrimack-Southern Grafton-
108 PM EDT Sat Jun 20 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL GRAFTON COUNTY...

At 108 PM EDT, a strong thunderstorm was located near Groton, or 12
miles southwest of Plymouth. The storm is nearly stationary.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Grafton, Canaan, Danbury, Groton, Bristol, Hebron, Dorchester and
Orange.

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 4372 7200 4371 7176 4357 7174 4358 7201
TIME...MOT...LOC 1708Z 001DEG 4KT 4365 7189

Special weather statement, Jun 20, 1:09 PM EDT, 3 hours 48 minutes before

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Special weather statement, Jun 20, 1:18 PM EDT, 3 hours 39 minutes before

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Special weather statement, Jun 20, 2:49 PM EDT, 2 hours 8 minutes before

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Special weather statement, Jun 20, 3:14 PM EDT, 1 hour 43 minutes before

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Special weather statement, Jun 20, 4:36 PM EDT, 21 minutes before

Special Weather Statement
National Weather Service Gray ME
436 PM EDT Sat Jun 20 2020

MEZ009-014-202100-
Southern Somerset-Central Somerset-
436 PM EDT Sat Jun 20 2020

...AN AREA OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN SOMERSET
COUNTY...

At 436 PM EDT, strong thunderstorms were clustered 7 miles west of
Kingsbury Plantation, or 17 miles west of Guilford, moving east at 5
mph.

Winds in excess of 40 mph and pea size hail are possible with this
storm.

Locations impacted include...
Bingham, Brighton Plantation, Caratunk Plantation, Mayfield, Bald
Mountain and Moscow.

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 4513 6966 4510 6966 4510 6965 4508 6964
      4507 6979 4518 6989 4526 6970
TIME...MOT...LOC 2036Z 251DEG 6KT 4513 6974

Hanes

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 19, 8:53 PM EDT	Beach Hazards Statement	GYX	Cumberland, Knox, Lincoln, Sagadahoc, Waldo, York	24 hr
Jun 20, 2:49 PM EDT	Special Weather Statement	GYX	York	41 min
Jun 20, 4:36 PM EDT	Special Weather Statement	GYX	Somerset	24 min
Jun 20, 5:02 PM EDT	Special Weather Statement	GYX	Somerset	28 min
Jun 20, 5:30 PM EDT	Areal Flood Advisory	GYX	Somerset	39 min
Jun 20, 7:57 PM EDT	Special Weather Statement	GYX	Waldo	33 min
Jun 20, 10:05 AM EDT	Special Weather Statement	GYX	Belknap	40 min
Jun 20, 11:08 AM EDT	Special Weather Statement	GYX	Grafton	52 min
Jun 20, 11:57 AM EDT	Special Weather Statement	GYX	Grafton	48 min
Jun 20, 1:03 PM EDT	Areal Flood Advisory	GYX	Carroll, Grafton, Merrimack	2 hr
Jun 20, 1:08 PM EDT	Special Weather Statement	GYX	Grafton	37 min
Jun 20, 1:09 PM EDT	Special Weather Statement	GYX	Grafton	36 min
Jun 20, 1:18 PM EDT	Special Weather Statement	GYX	Strafford	42 min
Jun 20, 1:24 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	36 min
Jun 20, 1:44 PM EDT	Severe Thunderstorm Warning	GYX	Grafton	24 min
Jun 20, 3:14 PM EDT	Special Weather Statement	GYX	Sullivan	46 min
Jun 20, 3:38 PM EDT	Severe Thunderstorm Warning	GYX	Sullivan	20 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.