Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 30, NWS Caribou, ME

September 15, 2021Penobscot County, Piscataquis County, Maine

NWS Caribou, ME issued this severe thunderstorm warning at Sep 15, 2021, 4:57 PM EDT for Penobscot County, Piscataquis County, Maine. It was in force for 48 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, 4:57 PM EDT (20:57 UTC)
Expired: Sep 15, 2021, 5:45 PM EDT
In force: 48 min
Issued by: NWS Caribou, ME
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Penobscot County, ME, Piscataquis County, ME

The radar

The Portland,ME radar (KGYX), 150 km from the middle of the area, began a volume at 20:59 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, 5:00 PM EDT	TSTM WND DMG	Wellington, ME	ONE TREE FELL ON A POWERLINE AND KNOCKED OUT POWER FOR ABOUT 3 1/2 HOURS.

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, 9.0 hours before the alert went out and 150 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.

617 
WUUS51 KCAR 152057
SVRCAR
MEC019-021-152145-
/O.NEW.KCAR.SV.W.0030.210915T2057Z-210915T2145Z/

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

The National Weather Service in Caribou Maine has issued a

* Severe Thunderstorm Warning for...
  Southeastern Piscataquis County in north central Maine...
  Southwestern Penobscot County in east central Maine...

* Until 545 PM EDT.

* At 456 PM EDT, a severe thunderstorm was located 11 miles south of
  Kingsbury Plantation, or 15 miles west of Dexter, moving northeast
  at 55 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...
  Dover-Foxcroft, Dexter, Newport, Guilford, Hermon, Corinth, Milo,
  Kenduskeag, Orneville, East Corinth, Lake View Plantation,
  Glenburn, Levant, Carmel, Corinna, Hudson, Charleston, Sangerville,
  Bradford and Brownville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4537 6889 4484 6888 4482 6928 4507 6936
      4505 6950 4504 6950 4503 6952 4502 6952
      4501 6962 4506 6964
TIME...MOT...LOC 2056Z 240DEG 46KT 4499 6960 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MW

2 follow-up statements

767 
WWUS51 KCAR 152123
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
523 PM EDT Wed Sep 15 2021

MEC019-021-152145-
/O.CON.KCAR.SV.W.0030.000000T0000Z-210915T2145Z/
Piscataquis ME-Penobscot ME-
523 PM EDT Wed Sep 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR SOUTHEASTERN PISCATAQUIS AND SOUTHWESTERN PENOBSCOT COUNTIES...

At 521 PM EDT, a severe thunderstorm was located over Dover-Foxcroft,
moving northeast at 50 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...
Dover-Foxcroft, Dexter, Newport, Guilford, Hermon, Corinth, Milo,
Kenduskeag, Orneville, East Corinth, Lake View Plantation, Glenburn,
Levant, Carmel, Corinna, Hudson, Charleston, Sangerville, Bradford
and Brownville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4537 6889 4484 6888 4482 6928 4507 6936
      4507 6941 4510 6944 4510 6942 4514 6944
TIME...MOT...LOC 2121Z 240DEG 46KT 4515 6920 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MW

708 
WWUS51 KCAR 152145
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
545 PM EDT Wed Sep 15 2021

MEC019-021-152151-
/O.EXP.KCAR.SV.W.0030.000000T0000Z-210915T2145Z/
Piscataquis ME-Penobscot ME-
545 PM EDT Wed Sep 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PISCATAQUIS AND
SOUTHWESTERN PENOBSCOT COUNTIES WILL EXPIRE AT 545 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits. Therefore, the warning will be allowed to expire.

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

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

LAT...LON 4537 6889 4484 6888 4482 6928 4507 6936
      4507 6941 4510 6944 4510 6942 4514 6944
TIME...MOT...LOC 2141Z 240DEG 46KT 4527 6890 

$$

MW

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 3:47 AM EDT	Small Craft Advisory	CAR		21 hr
Sep 15, 7:52 AM EDT	Special Weather Statement	CAR	Aroostook	38 min
Sep 15, 8:28 AM EDT	Special Weather Statement	CAR	Piscataquis	47 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.