Thunderstorms developed across Downeast areas through the late morning and early afternoon hours of the 30th in advance of an approaching cold front. producing damaging winds and large hail.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CAR wrote it up.
Thunderstorms developed across Downeast areas through the late morning and early afternoon hours of the 30th in advance of an approaching cold front. Some of the thunderstorms became severe...producing damaging winds and large hail. The storms crossed Downeast areas...including the coast...through the afternoon.
The local office's own words before the first event, 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 the first event at Jun 30, 11:53 AM EST, 22 minutes earlier.
Area Forecast Discussion National Weather Service Caribou ME 1253 PM EDT Wed Jun 30 2021 .SYNOPSIS... A cold front will begin to cross the region today through tonight. The front will then slowly cross the Gulf of Maine later Thursday into Friday. An upper level low will cross the region Saturday into Sunday. && .NEAR TERM /THROUGH TONIGHT/... ...Severe Storms Likely across the Highlands to the Downeast Coast this Afternoon... 12:52PM Update... Watching an area of thunderstorms along a line ahead of a previous outflow boundary. This line is still working within a favorable unstable environment with increased helicity so we are seeing pockets of enhanced updrafts. These storms will continue to track southeast towards the Washington county coastline. The air behind these storms will destabilize once again given the breaks in the clouds. Hi-Res guidance continues to show a decent environment for severe weather along and south of the well entrenched boundary over the central FA. MUCAPE increasing 1500-2500j/kg, 0-3km shear is holding its own in the 30-40kt range which will be sufficient for storm growth. Most of the hi-res guidance showing improved SFC-3km LR in the 7-7.5C/km with some suggesting near 8C/km. This will support the strong to severe storm potential and hence SPC has issued a Severe Thunderstorm Watch for the entire area except Aroostook. The tricky part of the watch is the main threat for severe storms will be in southern & central Piscataquis and central Penobscot southward. Therefore, changes were made in enhanced wording to match the severe watch and removed all enhanced wording across the north. Lastly, adjusted temperatures and dew points based on current observations and trends. Previous Discussion... Scattered strong to severe thunderstorms this afternoon across the Central Highlands and Interior Downeast. Strong storms may persist to the coast as well. Stalled front remains entrenched across the Crown of Maine this morning. Precip has been light thus far, with less than a tenth reported across the St. John Valley. Showers will increase in coverage through the morning. Some convection is noted across southern Quebec that will make an early arrival to Maine from Northern Somerset and tracking east towards Southern Aroostook. With mostly clear skies across Downeast and along the central/southern NB border, instability will quickly increase through the morning hours. Increased helicity values will also be exiting to the east early this morning, but there may be enough overlap to produce a strong storm with rotation given modeled hodographs and strong low level turning. Confidence remains low but nonzero, as EHI and 1/3km helicity remains elevated along the central and southern New Brunswick border this afternoon. Scattered strong to severe thunderstorms will continue to develop through the afternoon across the Central Highlands down to the coast. With ample shear and CAPE; damaging winds are the primary threat. If isolated, organized cells present themselves, small hail could also result, but high fz levels and very moist profiles to the sfc will work to inhibit larger hail. As has been the theme for the past week, the warm, humid air mass will promote excellent warm rain processes, resulting in heavy rainfall in any strong showers or storms. Training storms, especially those over regions that received heavy rainfall earlier this week, will promote ponding of water in poor drainage areas and rapid stream rises. Limitation today will be all of the bottled up warm air aloft cutting back on mid-level lapse rates. Guidance does advertise these closer to 6c/km this morning vs. runs on Tues. Regardless, it may be enough to keep damaging impacts limited to those isolated cells that check all of the other boxes. Storms weaken this evening as the front approaches the waters. Patchy fog may develop overnight over moist ground and cooling temperatures overnight. && .SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/... A nearly stationary frontal boundary will remain across Downeast areas Thursday while low pressure moves along the front. The front will slowly move south across the Gulf of Maine Thursday night through Friday while several lows track along the front. However, how rapidly the front moves south remains uncertain. An upper level trof also begins to approach Friday. Skies will remain mostly cloudy across the region, along with a chance of showers. Thursday. Shower chances Thursday night through Friday will be dependent on how rapidly the front moves south. The better shower chances Thursday night through Friday will remain across Downeast areas, closest to the front and lows moving along the front, with lesser shower chances northward across the remainder of the forecast area. A slower frontal movement would keep more extensive showers across Downeast areas. A more rapid southward movement could focus the most extensive showers across the Gulf of Maine, rather than across Downeast areas. The front will move south of the Gulf of Maine Friday night, while the upper trof approaches. Expect decreasing shower chances, along with mostly cloudy skies, Friday night. Temperatures will be at near normal, to slightly below normal, levels Thursday. Below normal level temperatures are expected Friday. && .LONG TERM /SATURDAY THROUGH TUESDAY/... An upper level low will cross the region Saturday through Sunday, then begin to move east Sunday night. Expect partly/mostly cloudy skies, along with a chance of showers, across the region Saturday through Sunday. High pressure will cross the region Monday with partly cloudy skies. A cold front will begin to approach later Tuesday, though the exact timing is still uncertain. A more rapid approach could bring a chance of showers/thunderstorms Tuesday afternoon and night, while a slower approach could delay the showers/thunderstorms to Wednesday. Below normal level temperatures are expected Saturday/Sunday, with near normal level temperatures Monday/Tuesday. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... NEAR TERM: 18z TAF changes expected. Expect MVFR with pockets of IFR at sites north of HUL. This is due to low cigs and fog. Should become primarily MVFR with some brief improvement to low end VFR. Winds N-NW 5-10kts. VFR elsewhere south of HUL/GNR to BGR and BHB with the threat of VCTS and CB. HUL to BHB expect W-SW winds 5-15kts. Stronger storms may contain damaging winds, large hail and torrential rainfall. MVFR/IFR ceilings expand southward this evening into Thur morning. BGR and BHB should remain VFR, outside of BR vis reduction overnight. SHORT TERM: Thursday...MVFR/IFR with a chance of showers. North winds around 10 knots across northern areas, variable winds around 10 knots Downeast. Thursday night...MVFR/IFR with showers, most numerous Downeast. Northeast winds 5 to 10 knots. Friday...VFR/MVFR north, MVFR/IFR Downeast. Showers, most numerous Downeast. Northeast wind 10 to 15 knots. Friday night...VFR/MVFR. Decreasing shower chances. Light winds. Saturday through Sunday...VFR/MVFR with a chance of showers. Variable winds around 10 knots. && .MARINE... NEAR TERM: No changes... Below SCA conditions. Thunderstorms will approach the waters from the west this afternoon and evening, some may contain strong wind gusts, frequent lightning, and small hail. Patchy fog develops this evening over the waters. SHORT TERM: Winds/seas are expected to remain below small craft advisory levels Thursday through Friday night. Visibilities will be reduced in showers and any patchy fog Thursday through Friday night. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...None. && Near Term...Cornwell/Sinko Short Term...Norcross Long Term...Norcross Aviation...Cornwell/Sinko/Norcross Marine...Cornwell/Sinko/Norcross
Hazardous Weather Outlook National Weather Service Caribou ME 429 AM EDT Wed Jun 30 2021 MEZ001>003-010830- Northwest Aroostook-Northeast Aroostook-Northern Somerset- 429 AM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Far Northern Maine and North Woods Maine. .DAY ONE...Today and Tonight. Thunderstorms may become strong this afternoon with gusty winds and heavy rain. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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. MEZ004>006-010-011-015>017-031-032-010830- Northern Piscataquis-Northern Penobscot-Southeast Aroostook- Central Piscataquis-Central Penobscot-Southern Penobscot- Interior Hancock-Central Washington-Southern Piscataquis- Northern Washington- 429 AM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Central Highlands Maine, Far Eastern Maine, Interior DownEast Maine, North Woods Maine and Penobscot Valley Maine. .DAY ONE...Today and Tonight. Scattered strong to severe thunderstorms will be possible this morning and afternoon. Storms may contain damaging winds, small hail, and heavy rain. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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. ANZ050>052-010830- 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- 429 AM EDT Wed Jun 30 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...Thursday through Tuesday. 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. MEZ029-030-010830- Coastal Hancock-Coastal Washington- 429 AM EDT Wed Jun 30 2021 This Hazardous Weather Outlook is for Coastal DownEast Maine. .DAY ONE...Today and Tonight. Strong to severe thunderstorms will be possible this afternoon. Storms may contain gusty winds, small hail, and heavy rainfall. An isolated damaging wind gusts is also possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. 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.
Special Weather Statement
National Weather Service Caribou ME
804 AM EDT Wed Jun 30 2021
MEZ004>006-301230-
Southeast Aroostook-Northern Piscataquis-Northern Penobscot-
804 AM EDT Wed Jun 30 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT EAST CENTRAL
PISCATAQUIS AND NORTH CENTRAL PENOBSCOT COUNTIES...
At 804 AM EDT, radar indicated strong thunderstorms were located
along a line extending from Katahdin Woods and Waters National
Monument to near Mount Katahdin to 7 miles south of Ripogenus.
Movement was east at 45 mph.
Wind gusts of 50 to 55 mph are possible with these storms.
Locations impacted include...
Patten, Mount Katahdin, Sherman, Mount Chase, Katahdin Woods and
Waters National Monument, Baxter State Park, Stacyville, Crystal,
Dyer Brook, Hersey and Katahdin Lake.
This includes State Highway 11 near Patten.
If outdoors, consider seeking shelter inside a building.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
LAT...LON 4577 6918 4585 6904 4606 6883 4610 6824
4592 6841 4576 6870 4574 6913
TIME...MOT...LOC 1204Z 260DEG 39KT 4602 6875 4588 6890 4578 6913
SinkoSpecial Weather Statement
National Weather Service Caribou ME
826 AM EDT Wed Jun 30 2021
MEZ005-006-301300-
Southeast Aroostook-Northern Penobscot-
826 AM EDT Wed Jun 30 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT SOUTHEASTERN AROOSTOOK
AND NORTH CENTRAL PENOBSCOT COUNTIES...
At 826 AM EDT, radar indicated strong thunderstorms were located
along a line extending from Patten to 7 miles west of Sherman to 8
miles northwest of Millinocket. Movement was east at 45 mph.
Wind gusts of 50 to 55 mph are possible with these storms.
Locations impacted include...
Patten, Hodgdon, Sherman, Island Falls, Mount Chase, Haynesville,
Sherman Station, southeastern Katahdin Woods and Waters National
Monument, Linneus, Oakfield, Stacyville, Crystal, Dyer Brook, Hersey,
Glenwood, Grindstone, Silver Ridge, Forkstown, Benedicta and Monarda.
This includes the following highways...
Interstate 95 between mile markers 251 and 281.
State Highway 11 between Grindstone and Patten.
If outdoors, consider seeking shelter inside a building.
These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
LAT...LON 4584 6803 4568 6833 4570 6882 4578 6882
4585 6870 4607 6851 4607 6787
TIME...MOT...LOC 1226Z 269DEG 39KT 4601 6843 4585 6857 4574 6885
SinkoSpecial Weather Statement
National Weather Service Caribou ME
921 AM EDT Wed Jun 30 2021
MEZ005-006-011-032-301400-
Southeast Aroostook-Central Penobscot-Northern Penobscot-Northern
Washington-
921 AM EDT Wed Jun 30 2021
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN
WASHINGTON...SOUTHEASTERN AROOSTOOK AND EAST CENTRAL PENOBSCOT
COUNTIES...
At 920 AM EDT, radar indicated strong thunderstorms were located
along a line extending from near Amity to 7 miles south of Medway.
Movement was southeast at 45 mph.
Wind gusts of 50 to 55 mph are possible with these storms.
Locations impacted include...
Lincoln, Danforth, Vanceboro, Medway, Springfield, Amity, Topsfield,
Haynesville, Grand Lake Stream, Lakeville, Fowler Township, Dyer
Township, Lincoln Township, Codyville Plantation, Wytopitlock, Reed
Plantation, Enfield, Lee, Mattawamkeag and Chester.
This includes the following highways...
Interstate 95 between mile markers 225 and 247.
US Highway 1 between Waite and North Amity.
State Highway 11 near Medway.
Torrential rainfall is also occurring with these storms, and may
cause localized flooding. Do not drive your vehicle through flooded
roadways.
LAT...LON 4534 6743 4532 6750 4520 6848 4551 6879
4595 6783 4591 6776 4588 6781 4582 6776
4580 6781 4568 6781 4566 6772 4569 6773
4562 6767 4559 6756 4560 6745 4551 6742
4549 6751 4542 6747 4538 6742
TIME...MOT...LOC 1320Z 316DEG 38KT 4585 6777 4551 6858
MStrauserSpecial Weather Statement National Weather Service Caribou ME 1110 AM EDT Wed Jun 30 2021 MEZ005-006-010-011-015>017-029>032-301700- Northern Penobscot-Southeast Aroostook-Central Piscataquis- Central Penobscot-Southern Penobscot-Interior Hancock- Central Washington-Coastal Hancock-Coastal Washington- Southern Piscataquis-Northern Washington- Including the cities of Millinocket, East Millinocket, Patten, Medway, Houlton, Hodgdon, Sherman, Smyrna Mills, Greenville, Monson, Blanchard, Lincoln, Howland, Springfield, Bangor, Brewer, Orono, Old Town, Amherst, Aurora, Dedham, Eastbrook, Great Pond, Calais, Grand Lake Stream, Wesley, Princeton, Ellsworth, Bar Harbor, Bucksport, Orland, Castine, Eastport, Perry, Machias, Cherryfield, Dover-Foxcroft, Milo, Guilford, Danforth, Vanceboro, and Topsfield 1110 AM EDT Wed Jun 30 2021 ...Strong to Severe Thunderstorms Today... Strong to severe thunderstorms are expected across portions of central and Downeast Maine this afternoon. Thunderstorms may contain strong wind gusts, hail, and torrential downpours. Strong thunderstorms can become severe, producing large hail, damaging winds, and very heavy rainfall. Continue to monitor the National Weather Service or your local media outlet for updates on this developing weather situation.
The Caribou radar (KCBW), 132 km away, was scanning. The volume nearest the first event began at 17:16 UTC.
14 thunderstorm wind, 1 hail. Local standard time, as filed.
A tree was toppled on to Leighton Point Road by wind gusts estimated at up to 60 mph. The time is estimated.
A tree was toppled on to Route 86 west of Dennysville by wind gusts estimated at up to 60 mph. The time is estimated.
Several trees were snapped by wind gusts estimated at up to 60 mph.
Several trees were toppled on Verona Island...included across Route 1...blocking access to Bucksport. Wind gusts were estimated at up to 60 mph. The time is estimated.
Trees were toppled on to wires in town by wind gusts estimated at up to 60 mph. The time is estimated.
A large tree was toppled across Route 1...blocking the road...by wind gusts estimated at up to 60 mph.
Numerous trees and wires were toppled on to several roads on Verona Island by wind gusts estimated at up to 60 mph. The time is estimated.
Several trees were toppled on to power lines closing portions of Castine Road. Wind gusts were estimated at up to 60 mph. The time is estimated.
Numerous trees were toppled on to power lines along Route 1 from Orland to Ellsworth by wind gusts estimated at up to 60 mph. The time is estimated.
Ten, estimated 24 inch diameter trees, were toppled by wind gusts estimated at up to 70 mph. Five windows were also blown out of a house...along with damage to a door.
Trees were toppled on to power lines by wind gusts estimated at up to 60 mph.
Trees were toppled on to power lines by wind gusts estimated at up to 60 mph. The time is estimated.
A pier was torn from the ground and tossed by wind gusts estimated at up to around 80 mph.
Golf ball size hail occurred.
A dozen trees were uprooted along the shoreline of a harbor. Minor damage was reported to boats tied to docks. A few boats suffered damage to their masts and antennas. Wind gusts were estimated at up to around 80 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2021Every state in 2021This day in weather historyWarnings in Maine, June 2021
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 967315, 967316, 967317, 967318, 967319, 967321, 967323, 967325, 967326, 967328, 967329, 967330, 967331, 967332, 967333.