Alert archive / Maine / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 33, NWS Caribou, ME

August 25, 2020Hancock County, Washington County, Maine

NWS Caribou, ME issued this severe thunderstorm warning at Aug 25, 2020, 4:14 PM EDT for Hancock County, Washington County, Maine. It was in force for 61 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 25, 2020, 4:14 PM EDT (20:14 UTC)
Expired: Aug 25, 2020, 5:15 PM EDT
In force: 61 min
Issued by: NWS Caribou, ME
Area: Storm-based polygon
Hail: 1.0 in
Wind: 70.0 mph

Counties Hancock County, ME, Washington County, ME

The radar

The Caribou radar (KCBW), 142 km from the middle of the area, began a volume at 20:13 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 watch it was issued in

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

Issued	Product	Office	Lasted
Aug 25, 3:12 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Caribou, ME (KCAR), launched 12:00Z, 8.2 hours before the alert went out and 234 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: 504 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 621 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.8

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 Caribou, ME wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 25, 3:59 PM EDT, 15 minutes earlier.

Area forecast discussion, Aug 25, 3:59 PM EDT, 15 minutes before

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Hazardous weather outlook, Aug 25, 3:36 PM EDT, 38 minutes before

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In the hours before

Special weather statement, Aug 25, 1:51 PM EDT, 2 hours 23 minutes before

Special Weather Statement
National Weather Service Caribou ME
151 PM EDT Tue Aug 25 2020

MEZ017-030-251830-
Coastal Washington-Central Washington-
151 PM EDT Tue Aug 25 2020

...A STRONG THUNDERSTORM WILL AFFECT SOUTHEASTERN WASHINGTON
COUNTY...

At 149 PM EDT, a strong thunderstorm was located 8 miles north of
Machias, moving east at 45 mph.

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

Locations impacted include...
Machias, Lubec, Eastport, Perry, Pembroke, Jonesboro, Cutler,
Centerville, East Machias, Machiasport, Marshfield, Whiting,
Dennysville, Whitneyville, Northfield, Wesley, Marion, Trescott and
Edmunds.

This includes US Highway 1 between Machias and Dennysville.

Heavy downpours may cause ponding of water on 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 4477 6695 4474 6700 4473 6711 4467 6762
      4489 6764 4497 6703 4493 6700 4491 6697
      4486 6698 4483 6697 4482 6695
TIME...MOT...LOC 1749Z 270DEG 45KT 4483 6742

Norcross

Special weather statement, Aug 25, 2:33 PM EDT, 1 hour 41 minutes before

Special Weather Statement
National Weather Service Caribou ME
233 PM EDT Tue Aug 25 2020

MEZ015-016-251915-
Interior Hancock-Southern Penobscot-
233 PM EDT Tue Aug 25 2020

...A STRONG THUNDERSTORM WILL AFFECT CENTRAL HANCOCK AND SOUTHWESTERN
PENOBSCOT COUNTIES...

At 231 PM EDT, a strong thunderstorm was located over East Corinth,
or 10 miles east of Dexter, moving east at 45 mph.

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

Locations impacted include...
Bangor, Old Town, Dexter, Newport, Orono, Hermon, Corinth, Veazie,
Kenduskeag, Indian Island, East Corinth, Glenburn, Milford, Levant,
Carmel, Eddington, Corinna, Hudson, Bradley and Greenbush.

This includes the following highways...
 Interstate 95 between mile markers 157 and 161, and between mile
markers 186 and 207.
 State Highway 11 between Newport and Bradford.

Heavy downpours may cause ponding of water on 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 4505 6935 4513 6847 4483 6842 4480 6929
      4484 6929
TIME...MOT...LOC 1831Z 270DEG 48KT 4501 6908

Norcross

Local storm report, Aug 25, 2:44 PM EDT, 1 hour 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
244 PM EDT TUE AUG 25 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0234 PM     HAIL             DEXTER                  45.03N 69.29W
08/25/2020  E0.70 INCH       PENOBSCOT          ME   PUBLIC

&&

JS

Local storm report, Aug 25, 3:40 PM EDT, 34 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 12:35 AM EDT	Dense Fog Advisory	CAR	Hancock, Penobscot, Piscataquis, Washington	8 hr
Aug 25, 9:21 AM EDT	Special Weather Statement	CAR	Aroostook	39 min
Aug 25, 1:51 PM EDT	Special Weather Statement	CAR	Washington	39 min
Aug 25, 2:02 PM EDT	Special Marine Warning	CAR		43 min
Aug 25, 2:33 PM EDT	Special Weather Statement	CAR	Penobscot	42 min
Aug 25, 2:44 PM EDT	Small Craft Advisory	CAR		31 hr
Aug 25, 2:46 PM EDT	Severe Thunderstorm Warning	CAR	Hancock, Penobscot	44 min
Aug 25, 2:57 PM EDT	Wind Advisory	CAR	Aroostook, Penobscot, Piscataquis, Somerset	29 hr
Aug 25, 3:28 PM EDT	Severe Thunderstorm Warning	CAR	Hancock, Penobscot, Washington	47 min
Aug 25, 3:58 PM EDT	Severe Thunderstorm Warning	CAR	Hancock, Washington	47 min
Aug 25, 4:09 PM EDT	Special Marine Warning	CAR		51 min
Aug 25, 4:30 PM EDT	Severe Thunderstorm Warning	CAR	Hancock	45 min
Aug 25, 4:42 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook	48 min
Aug 25, 4:51 PM EDT	Areal Flood Advisory	CAR	Aroostook	3 hr
Aug 25, 5:00 PM EDT	Special Marine Warning	CAR		90 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.