Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 17, NWS Caribou, ME

June 21, 2021Aroostook County, Maine

NWS Caribou, ME issued this severe thunderstorm warning at Jun 21, 2021, 6:29 PM EDT for Aroostook County, Maine. It was in force for 31 min. 5 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 21, 2021, 6:29 PM EDT (22:29 UTC)
Expired
Jun 21, 2021, 7:00 PM EDT
In force
31 min
Issued by
NWS Caribou, ME
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Aroostook County, ME

The radar

The Caribou radar (KCBW), 90 km from the middle of the area, began a volume at 22:31 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

TimeReportWhereRemark
Jun 21, 6:30 PM EDTTSTM WND DMG2 Wsw Limestone, MESTRUCTURAL DAMAGE.
Jun 21, 6:30 PM EDTTSTM WND DMG3 Ssw Loring, MECORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 WSW LIMESTONE. STRUCTURAL DAMAGE.
Jun 21, 6:36 PM EDTTSTM WND DMG4 Ene Washburn, METREE UPROOTED.
Jun 21, 6:48 PM EDTTSTM WND DMG1 N Limestone, METREE DOWN.
Jun 21, 6:48 PM EDTTSTM WND DMGLimestone, METREE UPROOTED AND TREE FELL ON ROOF OF HOUSE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Caribou, ME (KCAR), launched 12:00Z, 10.5 hours before the alert went out and 13 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-pSkew-T log-p diagram, Caribou, ME at 12:00Z on 2021-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Caribou, ME at 12:00Z on 2021-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1363 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
113 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

863 
WUUS51 KCAR 212229
SVRCAR
MEC003-212330-
/O.NEW.KCAR.SV.W.0017.210621T2229Z-210621T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Caribou ME
629 PM EDT Mon Jun 21 2021

The National Weather Service in Caribou Maine has issued a

* Severe Thunderstorm Warning for...
  East central Aroostook County in northern Maine...

* Until 730 PM EDT.

* At 628 PM EDT, severe thunderstorms were located along a line
  extending from near Limestone to 7 miles northeast of Portage, 
  moving northeast at 35 mph. This storm has a history of producing 
  damaging wind.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Presque Isle, Caribou, Fort Fairfield, Limestone, Mapleton,
  Washburn, Ashland, Woodland, Loring, New Sweden, Connor, Castle
  Hill, Perham, Caswell, Wade and Westmanland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage across east central Aroostook County. SEEK SHELTER NOW 
inside a sturdy structure and stay away from windows! To report 
severe weather, contact the National Weather Service office in 
Caribou Maine, by calling 1-800-909-5970 or visit 
https://inws.ncep.noaa.gov/report.

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

&&

LAT...LON 4675 6779 4672 6815 4674 6823 4673 6842
      4677 6844 4685 6844 4695 6827 4705 6779
TIME...MOT...LOC 2228Z 236DEG 31KT 4694 6783 4682 6835 

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

Cornwell
2 follow-up statements
411 
WWUS51 KCAR 212250
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
650 PM EDT Mon Jun 21 2021

MEC003-212330-
/O.CON.KCAR.SV.W.0017.000000T0000Z-210621T2330Z/
Aroostook ME-
650 PM EDT Mon Jun 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR EAST CENTRAL AROOSTOOK COUNTY...

At 649 PM EDT, a severe thunderstorm was located near Limestone, 
moving northeast at 35 mph. This storm has a history of producing 
damaging winds.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Caribou, Fort Fairfield, Limestone, Washburn, Woodland, Loring, New
Sweden, Connor, Perham, Caswell and Westmanland.

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 4679 6779 4684 6820 4693 6823 4703 6779
TIME...MOT...LOC 2249Z 240DEG 29KT 4687 6786 

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

Cornwell
462 
WWUS51 KCAR 212300
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
700 PM EDT Mon Jun 21 2021

MEC003-212310-
/O.CAN.KCAR.SV.W.0017.000000T0000Z-210621T2330Z/
Aroostook ME-
700 PM EDT Mon Jun 21 2021

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

LAT...LON 4679 6779 4684 6820 4693 6823 4703 6779
TIME...MOT...LOC 2259Z 236DEG 31KT 4693 6774 

$$

Cornwell

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 21, 2:02 PM EDTSevere Thunderstorm WarningCARPiscataquis, Somerset58 min
Jun 21, 3:20 PM EDTSevere Thunderstorm WarningCARAroostook, Piscataquis, Somerset40 min
Jun 21, 3:39 PM EDTTornado WarningCARAroostook, Piscataquis36 min
Jun 21, 4:14 PM EDTTornado WarningCARAroostook, Piscataquis46 min
Jun 21, 4:59 PM EDTTornado WarningCARAroostook46 min
Jun 21, 5:37 PM EDTSevere Thunderstorm WarningCARAroostook53 min
Jun 21, 5:55 PM EDTDense Fog AdvisoryCARHancock, Washington12 hr
Jun 21, 6:34 PM EDTAreal Flood AdvisoryCARAroostook103 min
Jun 21, 7:44 PM EDTSpecial Weather StatementCARPiscataquis61 min

Nearby

Severe Thunderstorm Warnings in Maine, 2021Every 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.