Alert archive / Maine / Special Weather Statements in 2021

Special Weather Statement, NWS Caribou, ME

August 14, 2021

NWS Caribou, ME issued this special weather statement at Aug 14, 2021, 11:29 AM EDT. 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 outline as issued.

The facts

Issued
Aug 14, 2021, 11:29 AM EDT (15:29 UTC)
Expired
Aug 14, 2021, 12:30 PM EDT
In force
61 min
Issued by
NWS Caribou, ME
Hail
0.50 in
Wind
40

The radar

The Caribou radar (KCBW), 30 km from the middle of the area, began a volume at 15:34 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, 3.5 hours before the alert went out and 98 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 2021-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 451 joules per kilogram.LCLLFCEL10008507005003002001001 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 2021-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 28 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
451 J/kg
Mixed-layer CIN
-123 J/kg
Mixed-layer LCL
1044 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
28 m²/s²
0-3 km storm-relative helicity
142 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 14, 11:12 AM EDT, 17 minutes earlier.

Area forecast discussion, Aug 14, 11:12 AM EDT, 17 minutes before
Area Forecast Discussion
National Weather Service Caribou ME
1112 AM EDT Sat Aug 14 2021

.SYNOPSIS...
A cold front will push through the region this afternoon and off
the coast tonight. High pressure builds over the area Sunday
through Monday, then slowly slides offshore through Tuesday
night. A trough of low pressure enters Maine on Wednesday.

&&

.NEAR TERM /THROUGH TONIGHT/...
11:10 AM Update...The leading line of convection, now across
northern Penobscot County, has been dissipating except for one
strong storm in north central Penobscot County. The main line of
convection associated with the cold front is now moving into our
western border and expected to cross the area through early
afternoon. Updated pops to reflect current movement of lines of
storms and adjusted temps up in the northeast where some
sunshine has warmed the air a bit faster than initially
expected.

Previous Discussion...
The pre-frontal trof is forecast to slide east this morning
ahead of the main cold front, which was still sitting back
across the St. Lawrence River. Showers and tstms will accompany
the pre-frontal trof. After collaborating w/GYX, decided to stay
w/enhanced wording for strong wind gusts and heavy rainfall.
The severe threat looks to be marginal today as the steepest
lapse rates run out ahead of the main activity expected to hit
the area earlier this afternoon. With that being said,
instability is definitely there w/CAPE of 1000-1500 joules.
0-6km shear of 30 kts w/PWS 1.7 to 2+ inches will be enough to
keep tstms going along the pre-frontal trof. Modest lapse rates
ahead of the trof could allow a few cells to get quite strong
w/even a cell hitting severe limits briefly. This would mainly
be for eastern Aroostook, northern Piscataquis and northern
Penobscot County. Getting back to the main activity that is
expected to set up ahead of the cold front this afternoon, there
will be tstms developing in a broken line that will progress
eastward into the afternoon. The main focus for organized
convection and strong storms will across east- central Aroostook
County down into the Penobscot and Downeast region. The NAMNEST
and HRRR matched up this morning and seem to be close w/what is
occurring on radar attm. This guidance shows this line of
convection pushing east w/the individual cells moving ene. Given
the very high PWs, warm cloud layer and a mid- level punch of
35-40 kts aligning w/the storm movement, some training of cells
could occur w/the threat for some very high rainfall rates. The
threat is also there for some urban/street flooding if this
training sets up. This will need to be monitored by the daycrew.

Activity looks to wind down rather quickly this evening as the
cold front slides off to the ese w/showers and storms exiting
their way into New Brunswick. Cooler and much drier air will
follow in behind the cold front tonight. Overnight low temps are
expected to be in the mid to upper 50s. What a difference over
the last week w/temps at night in the 60s and lower 70s w/record
high minimum temps being set.

&&

.SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
The axis of a northern stream trough will cross the area on
Sunday. However, with limited moisture to work with, only a few
passing high clouds could mark its passage. Sunday will be
noticeably cooler than today, with highs mainly from the mid 70s
to around 80, except lower 70s across the North Woods and near
the immediate coast. These values are near to slightly below
normal for the date.

The region will be under zonal flow aloft Sunday night and
Monday. With no significant shortwave progged to be embedded in
the flow, and continued dry mid to upper levels of the
atmosphere, it should be dry with minimal cloud cover. Lows
Sunday night should run around 5 degrees below normal (mainly
from the upper 40s to mid 50s), and highs on Monday should be
near to slightly above normal.

Deep layered ridging begins to build in Monday night, with
associated subsidence keeping things dry, with minimal cloud
cover. Lows Monday night should be near normal.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
Deep layered ridging continues to build over the area Tuesday,
with its axis progged to slide to the east Tuesday night. Once
again, subsidence under the ridge should keep things dry.

A series of northern stream shortwaves work there way over the
top of the ridge Wednesday-Thursday (exact timing varies from
model to model - but the general idea is the same on the whole).
For now it appears that any isolated showers/thunderstorms on
Wednesday should be limited to portions of the North Woods, then
the potential should increase over the entire CWA Wednesday
night, with more scattered showers/thunderstorms on Thursday as
northern stream troughing gradually becomes established over the
region.

Temperatures should be above normal Tuesday-Thursday but not as
warm as the past couple of days.

&&

.AVIATION /15Z SATURDAY THROUGH WEDNESDAY/...
NEAR TERM: VFR today w/some MVFR early this morning in fog
mainly for KBHB and possibly KPQI. Expecting showers and
tstms today which could lower conditions to MVFR/IFR for a 2 hr
window. Some of the tstms could be strong and perhaps severe.
The main activity will be this afternoon. Strong wind gusts and
heavy rainfall the main threats. SSW winds 5 to 10 kt.

Tonight...VFR all terminals w/some patchy fog possible later
tonight into Sunday morning. Light NW winds around 5 kts.

SHORT TERM:
Sunday-Wednesday: VFR.

&&

.MARINE...
NEAR TERM: S winds < 10 kts becoming SW later this morning and
then turning W at 10 kt by the evening. Seas 1-2 ft. Showers and
tstms later this afternoon into early evening.

Tonight...W wind around 10 kt becoming NW 10-15 kts. Seas
around 2 ft.

SHORT TERM: A relaxed pressure gradient should limit winds to
around 10 kt or less Sunday-Wednesday. As a result seas on the
coastal ocean waters should be 3 ft or less and on the intra-
coastal waters 2 ft or less through this time frame.

&&

.CAR WATCHES/WARNINGS/ADVISORIES...
ME...None.
MARINE...None.

&&

Near Term...Hewitt/MCB
Short Term...Maloit
Long Term...Maloit
Aviation...Hewitt/Maloit
Marine...Hewitt/Maloit
Hazardous weather outlook, Aug 14, 4:36 AM EDT, 6 hours 53 minutes before
Hazardous Weather Outlook
National Weather Service Caribou ME
436 AM EDT Sat Aug 14 2021

MEZ001-003-004-150845-
Northwest Aroostook-Northern Somerset-Northern Piscataquis-
436 AM EDT Sat Aug 14 2021

This Hazardous Weather Outlook is for Far Northern Maine and North
Woods Maine.

.DAY ONE...Today and tonight.

Thunderstorms are expected today with a few storms containing gusty
winds and small hail.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

MEZ002-005-006-010-031-150845-
Northeast Aroostook-Northern Penobscot-Southeast Aroostook-
Central Piscataquis-Southern Piscataquis-
436 AM EDT Sat Aug 14 2021

This Hazardous Weather Outlook is for Central Highlands Maine, Far
Eastern Maine and Far Northern Maine.

.DAY ONE...Today and tonight.

Thunderstorms are expected later this morning into this afternoon.
Some thunderstorms could be strong to possibly severe with strong
wind gusts and very heavy rainfall.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

MEZ011-015>017-029-030-032-150845-
Central Penobscot-Southern Penobscot-Interior Hancock-
Central Washington-Coastal Hancock-Coastal Washington-
Northern Washington-
436 AM EDT Sat Aug 14 2021

This Hazardous Weather Outlook is for Coastal DownEast Maine, Far
Eastern Maine, Interior DownEast Maine and Penobscot Valley Maine.

.DAY ONE...Today and tonight.

Thunderstorms expected this afternoon into the early evening. A few
storms could be strong to possibly severe with strong wind gusts and
very heavy rainfall. The heavy rainfall could lead to some minor
street flooding.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

Hazardous weather is not expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

ANZ050>052-150845-
Coastal Waters from Eastport, ME to Schoodic Point, ME out 25 NM-
Coastal Waters from Schoodic Point, ME to Stonington, ME out 25 NM-
Intra Coastal Waters from Schoodic Point, ME to Stonington, ME-
436 AM EDT Sat Aug 14 2021

This Hazardous Weather Outlook is for Atlantic Coastal Waters.

.DAY ONE...Today and tonight.

No hazardous weather is expected at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Weather spotters are encouraged to report significant weather
conditions according to Standard Operating Procedures.

In the hours before

Special weather statement, Aug 14, 9:36 AM EDT, 1 hour 53 minutes before
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Special weather statement, Aug 14, 10:31 AM EDT, 58 minutes before
Special Weather Statement
National Weather Service Caribou ME
1031 AM EDT Sat Aug 14 2021

MEZ005-006-141515-
Southeast Aroostook ME-Northern Penobscot ME-
1031 AM EDT Sat Aug 14 2021

...A strong thunderstorm will impact portions of central Penobscot
County through 1115 AM EDT...

At 1031 AM EDT, Doppler radar was tracking a strong thunderstorm near
Millinocket, moving northeast at 30 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Millinocket, East Millinocket, Medway, Stacyville, Grindstone,
Norcross, Benedicta and Molunkus.

This includes the following highways...
 Interstate 95 between mile markers 246 and 261.
 State Highway 11 between Norcross and East Millinocket, and between
Grindstone and Stacyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4568 6883 4574 6883 4590 6846 4566 6836
      4554 6887 4566 6896
TIME...MOT...LOC 1431Z 240DEG 25KT 4562 6883

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Bloomer
Special weather statement, Aug 14, 11:29 AM EDT, 0 minutes before
Special Weather Statement
National Weather Service Caribou ME
1129 AM EDT Sat Aug 14 2021

MEZ002-005-006-141630-
Southeast Aroostook ME-Northeast Aroostook ME-Northern Penobscot ME-
1129 AM EDT Sat Aug 14 2021

...A strong thunderstorm will impact portions of southeastern
Aroostook and north central Penobscot Counties through 1230 PM EDT...

At 1128 AM EDT, Doppler radar was tracking a strong thunderstorm near
Patten, moving northeast toward Houlton and vicinity at 30 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Houlton, Patten, Hodgdon, Sherman, Island Falls, Bridgewater, Smyrna,
Amity, Mount Chase, Dudley Township, Sherman Station, Cary
Plantation, Shin Pond, Smyrna Mills, northeastern Katahdin Woods and
Waters National Monument, Littleton, Linneus, Monticello, Oakfield
and Blaine.

This includes the following highways...
 Interstate 95 between mile markers 259 and 304.
 US Highway 1 between North Amity and Bridgewater.
 State Highway 11 between Sherman and Knowles Corner.

LAT...LON 4573 6839 4609 6863 4650 6779 4595 6778
TIME...MOT...LOC 1528Z 237DEG 27KT 4595 6843

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

Bloomer

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 4:04 AM EDTSpecial Weather StatementCAR41 min
Aug 14, 9:36 AM EDTSpecial Weather StatementCARPenobscot39 min
Aug 14, 10:31 AM EDTSpecial Weather StatementCARPenobscot44 min
Aug 14, 2:24 PM EDTSpecial Weather StatementCARHancock66 min
Aug 14, 2:43 PM EDTSpecial Weather StatementCARAroostook47 min
Aug 14, 3:02 PM EDTSpecial Weather StatementCARHancock73 min
Aug 14, 3:07 PM EDTSevere Thunderstorm WarningCARHancock38 min
Aug 14, 3:41 PM EDTSpecial Weather StatementCARHancock49 min
Aug 14, 4:22 PM EDTSpecial Weather StatementCARWashington38 min
Aug 14, 4:58 PM EDTSpecial Weather StatementCARWashington47 min

Nearby

Special Weather Statements in Maine, 2021Every special weather statement 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.