Alert archive / Maine / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Caribou, ME

May 21, 2021Aroostook County, Maine

NWS Caribou, ME issued this severe thunderstorm warning at May 21, 2021, 3:07 PM EDT for Aroostook County, Maine. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 21, 2021, 3:07 PM EDT (19:07 UTC)
Expired
May 21, 2021, 3:30 PM EDT
In force
23 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), 21 km from the middle of the area, began a volume at 19:11 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

Caribou, ME (KCAR), launched 12:00Z, 7.1 hours before the alert went out and 73 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 2021-05-21Temperature 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 2021-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 square meters per square second.193958Sfc1 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
1493 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
114 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

137 
WUUS51 KCAR 211907
SVRCAR
MEC003-211930-
/O.NEW.KCAR.SV.W.0003.210521T1907Z-210521T1930Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Caribou ME
307 PM EDT Fri May 21 2021

The National Weather Service in Caribou Maine has issued a

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

* Until 330 PM EDT.

* At 307 PM EDT, a severe thunderstorm was located 8 miles north of
  Houlton, moving southeast at 25 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Houlton, Hodgdon, Smyrna, Littleton, Monticello, New Limerick and
  Ludlow.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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.

&&

LAT...LON 4618 6808 4636 6791 4631 6778 4603 6778
TIME...MOT...LOC 1907Z 303DEG 20KT 4624 6789 

HAIL...<.75IN
WIND...60MPH
 
$$

Cornwell
2 follow-up statements
797 
WWUS51 KCAR 211920
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
320 PM EDT Fri May 21 2021

MEC003-211930-
/O.CON.KCAR.SV.W.0003.000000T0000Z-210521T1930Z/
Aroostook ME-
320 PM EDT Fri May 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM EDT
FOR EAST CENTRAL AROOSTOOK COUNTY...

At 320 PM EDT, a severe thunderstorm was located near Houlton, moving
southeast at 25 mph. Strong winds may arrive before rain.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Houlton, Hodgdon, Littleton, Monticello, New Limerick and Ludlow. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4615 6802 4632 6781 4631 6778 4603 6778
TIME...MOT...LOC 1920Z 304DEG 20KT 4619 6780 

HAIL...<.75IN
WIND...60MPH
 
$$

Cornwell
687 
WWUS51 KCAR 211929
SVSCAR

Severe Weather Statement
National Weather Service Caribou ME
329 PM EDT Fri May 21 2021

MEC003-211936-
/O.EXP.KCAR.SV.W.0003.000000T0000Z-210521T1930Z/
Aroostook ME-
329 PM EDT Fri May 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL AROOSTOOK COUNTY
WILL EXPIRE AT 330 PM EDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will 
be allowed to expire.  Gusty winds and lightning are still possible 
with this thunderstorm.

LAT...LON 4615 6802 4632 6781 4631 6778 4603 6778
TIME...MOT...LOC 1926Z 303DEG 20KT 4617 6777 

$$

Cornwell

The office that day

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

IssuedProductOfficeCountiesLasted
May 21, 1:29 PM EDTSpecial Weather StatementCARAroostook46 min
May 21, 2:31 PM EDTSpecial Weather StatementCAR44 min
May 21, 3:30 PM EDTBeach Hazards StatementCARHancock, Washington29 hr
May 21, 3:32 PM EDTSmall Craft AdvisoryCAR38 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.