Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 22, NWS Caribou, ME

June 30, 2021Hancock County, Maine

NWS Caribou, ME issued this severe thunderstorm warning at Jun 30, 2021, 4:53 PM EDT for Hancock County, Maine. It was in force for 52 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: Jun 30, 2021, 4:53 PM EDT (20:53 UTC)
Expired: Jun 30, 2021, 5:45 PM EDT
In force: 52 min
Issued by: NWS Caribou, ME
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Hancock County, ME

The radar

The Portland,ME radar (KGYX), 139 km from the middle of the area, began a volume at 20:56 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
Jun 30, 5:06 PM EDT	TSTM WND DMG	Blue Hill, ME	TREES DOWN ON POWERLINES.
Jun 30, 5:17 PM EDT	TSTM WND DMG	1 Sse Trenton, ME	TREES DOWN ON POWERLINES. TIME ESTIMATED VIA 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
Jun 30, 12:06 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 8.9 hours before the alert went out and 139 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: 906 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1312 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 102 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.3

Open this sounding in Storm Lab

The text

As transmitted.

296 
WUUS51 KCAR 302053
SVRCAR
MEC009-302145-
/O.NEW.KCAR.SV.W.0022.210630T2053Z-210630T2145Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Caribou ME
453 PM EDT Wed Jun 30 2021

The National Weather Service in Caribou Maine has issued a

* Severe Thunderstorm Warning for...
  Southern Hancock County in southeastern Maine...

* Until 545 PM EDT.

* At 453 PM EDT, a severe thunderstorm was located near Castine, or
  near Blue Hill, moving east at 40 mph.

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

  SOURCE...Radar indicated.

  IMPACT...Expect damage to trees and power lines.

* Locations impacted include...
  Bar Harbor, Blue Hill, Castine, Penobscot Township, Tremont,
  Trenton, Surry, Sedgwick, Brooksville, Brooklin, Winter Harbor,
  Cranberry Isles and Somesville.

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 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4428 6868 4426 6875 4431 6873 4430 6869
      4434 6875 4428 6879 4430 6880 4430 6881
      4429 6881 4431 6883 4443 6876 4438 6882
      4442 6882 4443 6881 4446 6797 4430 6808
      4428 6816 4416 6819
TIME...MOT...LOC 2053Z 270DEG 36KT 4435 6869 

HAIL...0.75IN
WIND...60MPH
 
$$

MStrauser

3 follow-up statements

258 
WWUS51 KCAR 302106
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
506 PM EDT Wed Jun 30 2021

MEC009-302145-
/O.CON.KCAR.SV.W.0022.000000T0000Z-210630T2145Z/
Hancock ME-
506 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHERN HANCOCK COUNTY...

At 506 PM EDT, a severe thunderstorm was located near Blue Hill,
moving east at 40 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Bar Harbor, Blue Hill, Lamoine, Tremont, Trenton, Surry, Sedgwick,
Brooksville, Brooklin, Winter Harbor, Cranberry Isles and Somesville.

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 
localized flooding. Do not drive your vehicle through flooded 
roadways.

&&

LAT...LON 4423 6850 4428 6868 4427 6874 4428 6872
      4430 6872 4430 6869 4432 6871 4439 6868
      4435 6868 4437 6866 4440 6868 4444 6866
      4446 6797 4431 6807 4432 6813 4428 6816
      4421 6818 4419 6821
TIME...MOT...LOC 2106Z 273DEG 34KT 4433 6854 

HAIL...1.00IN
WIND...60MPH
 
$$

MStrauser

509 
WWUS51 KCAR 302135
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
535 PM EDT Wed Jun 30 2021

MEC009-302145-
/O.CON.KCAR.SV.W.0022.000000T0000Z-210630T2145Z/
Hancock ME-
535 PM EDT Wed Jun 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHERN HANCOCK COUNTY...

At 535 PM EDT, a severe thunderstorm was located 8 miles south of Bar
Harbor, moving east at 30 mph.

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

SOURCE...Radar indicated.

IMPACT...Minor hail damage to vehicles is possible. Expect wind 
         damage to trees and power lines.

Locations impacted include...
Tremont and Cranberry Isles. 

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 4422 6840 4433 6838 4436 6804 4433 6805
      4431 6807 4432 6813 4428 6816 4427 6816
      4421 6818 4420 6819 4420 6820 4419 6820
TIME...MOT...LOC 2135Z 271DEG 27KT 4426 6820 

HAIL...1.00IN
WIND...60MPH
 
$$

Sinko

872 
WWUS51 KCAR 302145
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
545 PM EDT Wed Jun 30 2021

MEC009-302155-
/O.EXP.KCAR.SV.W.0022.000000T0000Z-210630T2145Z/
Hancock ME-
545 PM EDT Wed Jun 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN HANCOCK COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
southeastern Maine.

LAT...LON 4422 6840 4433 6838 4436 6804 4433 6805
      4431 6807 4432 6813 4428 6816 4427 6816
      4421 6818 4420 6819 4420 6820 4419 6820
TIME...MOT...LOC 2145Z 270DEG 36KT 4426 6808 

$$

MStrauser

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 30, 8:04 AM EDT	Special Weather Statement	CAR	Piscataquis	26 min
Jun 30, 8:26 AM EDT	Special Weather Statement	CAR		34 min
Jun 30, 9:21 AM EDT	Special Weather Statement	CAR	Penobscot	39 min
Jun 30, 9:53 AM EDT	Severe Thunderstorm Warning	CAR	Washington	52 min
Jun 30, 1:35 PM EDT	Special Marine Warning	CAR		43 min
Jun 30, 2:25 PM EDT	Severe Thunderstorm Warning	CAR	Hancock, Penobscot	65 min
Jun 30, 3:10 PM EDT	Severe Thunderstorm Warning	CAR	Hancock	50 min
Jun 30, 5:03 PM EDT	Special Marine Warning	CAR		57 min
Jun 30, 5:31 PM EDT	Severe Thunderstorm Warning	CAR	Aroostook, Washington	29 min
Jun 30, 7:49 PM EDT	Special Weather Statement	CAR	Aroostook	41 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.