A back-door cold front moved from New Brunswick toward northeast Maine while another cold front approached from Quebec Province during the 12th. Showers and thunderstorms developed during the afternoon and evening between these two fronts.
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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.
A back-door cold front moved from New Brunswick toward northeast Maine while another cold front approached from Quebec Province during the 12th. Showers and thunderstorms developed during the afternoon and evening between these two fronts. An isolated severe thunderstorm produced damaging wind gusts in southern Piscataquis county. Trees were toppled in the vicinity of Brownville Junction by wind gusts estimated at up to 60 mph. Heavy downpours with the thunderstorms also produced localized street and poor drainage flooding.
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 12, 1:08 PM EST, 4 hours 22 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Caribou ME 208 PM EDT Fri Jun 12 2026 .WHAT HAS CHANGED... No significant changes to the forecast && .KEY MESSAGES... 1) The threat for localized heavy rainfall and flash flooding continues this afternoon and evening, mainly over western areas. 2) Cold front approaches Saturday night and passes through Sunday into Monday, bringing widespread rain and thunderstorm chances. && .DISCUSSION... KEY MESSAGE 1...The threat for localized heavy rainfall and flash flooding continues this afternoon and evening, mainly over western areas. KEY MESSAGE 1 DESCRIPTION... Backdoor cold front is now in eastern Aroostook as seen on visible satellite imagery. Storms developed in between the backdoor cold front and the eastward moving cold front coming in fm Quebec. Southerly flow over central and wrn portions of the area has continued to funnel anomalous moisture into the Central Highlands and the North Woods. In fact 12z GYX sounding set a record with a PW value of 1.91 inches. Flash Flood Watch remains in effect for wrn zones through 07z tonight due to high PW values, small Corfidi Vectors and efficient warm rain processes. The threat for flash flooding, with rainfall rates of 1-2 inches per hour, continues through the time of fropa which looks to occur over part of CWA by 07z. KEY MESSAGE 2..Cold front approaches Saturday night and passes through Sunday into Monday, bringing widespread rain and thunderstorm chances. KEY MESSAGE 2 DESCRIPTION... Shortwave over the Great Lakes region moves towards Maine and enters New England by Sunday. Rain moves in from west to east, lasting Sunday into late Monday. Instability on Sunday ranges from between 500-800 J/kg with steep low-level lapse rates, however mid-level lapse rates are meager. Instability may be limited by capping inversion in the afternoon but cannot rule out isolated thunderstorm development, mainly over the north and west. Prolonged southerly flow off the Gulf of Maine is anticipated to keep the Downeast region stable. Roughly anticipating about one half to three quarters of an inch of rain with these showers. Could be some locally higher spots of higher rain totals in regions favoring thunderstorm development. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... This afternoon...VFR/MVFR at BGR. BHB likely to see VFR before plummeting to IFR after 21z as marine layer moves back north. Aroostook terminals to see IFR continues remainder of the afternoon and overnight. SSE winds 5-10kts. Saturday...IFR/LIFR with FG/BR in the AM becoming VFR/MVFR late morning. VFR by afternoon. SE winds shifting WNW 5-15kt. Saturday Night...VFR at KHUL/KBGR/KBHB. Chance for MVFR and isolated VCTS at KFVE/KCAR/KPQI. Winds light and variable. Sunday-Sunday Night...MVFR/IFR north due to rain showers and potential thunderstorms in the morning and day. VFR/MVFR Downeast terminals. S winds with gusts 15-25KT possible Sunday. LLWS possible Sunday night. Monday...MVFR in rain showers in the morning. Potential for isolated thunder Downeast terminals in the morning. Potential for isolated thunder at KFVE and KCAR Monday evening. S winds, shifting WSW by afternoon, with gusts 15-20KT possible. Monday night-Wednesday...VFR. W winds, 5-10KT, gusts to 20kts Tuesday afternoon. Winds becoming SW Tuesday night increasing to 5-10kts Wednesday. && .MARINE... Winds and seas will be below small craft levels all waters through the weekend. Winds and seas approach small craft levels over the waters out to 25NM Sunday night. Conditions drop below small craft levels on Monday afternoon and remain that way into the middle of next week. Fog will reduce visibilities over the waters tonight. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...Flood Watch through late tonight for MEZ001-003-004-010-031. MARINE...None. && DISCUSSION...21 AVIATION...21
Special Weather Statement National Weather Service Caribou ME 221 PM EDT Fri Jun 12 2026 MEZ001>006-010-011-015>017-029>032-140000- Northwest Aroostook-Northeast Aroostook-Northern Somerset- Northern Piscataquis-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 Allagash, Clayton Lake, Madawaska, Fort Kent, Frenchville, Presque Isle, Caribou, Van Buren, Mars Hill, Ashland, Baker Lake, Billy-Jack Depot, Baxter St Park, Churchill Dam, Mount Katahdin, Ripogenus, Telos Lake, Caucomgomoc Lake, Chamberlain Lake, 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 221 PM EDT Fri Jun 12 2026 ...National Weather Service Cold Water Safety Message... * The warm air temperatures this weekend in the low to mid 80s may cause people to underestimate the dangers of the cold water temperatures which are currently only around 60 on the lakes and around 70 on the rivers. * The cold water temperatures can quickly cause hypothermia to anyone immersed in the water. According to the Maine Warden Service, even when the water temperature is below 70 degrees, hypothermia and loss of dexterity can occur in 45 minutes or less. Anyone on small boats, canoes or kayaks should plan accordingly if recreating this weekend and use extreme caution to avoid this threat. Paddle smart from the start and always wear your life jacket!
Special Weather Statement
National Weather Service Caribou ME
334 PM EDT Fri Jun 12 2026
MEZ004-005-122015-
Northern Piscataquis ME-Northern Penobscot ME-
334 PM EDT Fri Jun 12 2026
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL PISCATAQUIS AND
NORTH CENTRAL PENOBSCOT COUNTIES THROUGH 415 PM EDT...
At 333 PM EDT, Doppler radar was tracking a strong thunderstorm near
Mount Katahdin, moving northeast at 30 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Patten, Mount Katahdin, Ripogenus, Mount Chase, Katahdin Woods and
Waters National Monument, Shin Pond, Sherman Station, Baxter State
Park, Stacyville, and Katahdin Lake.
This includes State Highway 11 near Sherman Station.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm 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 4618 6860 4596 6843 4589 6843 4575 6908
4590 6920
TIME...MOT...LOC 1933Z 245DEG 27KT 4587 6902
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
SMSpecial Weather Statement
National Weather Service Caribou ME
618 PM EDT Fri Jun 12 2026
MEZ010-015-031-122300-
Southern Penobscot ME-Southern Piscataquis ME-Central Piscataquis ME-
618 PM EDT Fri Jun 12 2026
...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN PISCATAQUIS AND
WESTERN PENOBSCOT COUNTIES THROUGH 700 PM EDT...
At 618 PM EDT, Doppler radar was tracking a strong thunderstorm over
Kingsbury Plantation, or 12 miles southwest of Guilford, moving
southeast at 15 mph.
HAZARD...Wind gusts up to 40 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
Locations impacted include...
Dexter, Monson, Blanchard, Kingsbury Plantation, Corinna,
Sangerville, Parkman, Abbot, Wellington, and Kingsbury.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
&&
LAT...LON 4526 6953 4500 6920 4494 6932 4507 6936
4505 6950 4504 6950 4503 6952 4502 6952
4501 6962 4509 6964 4511 6966 4512 6965
4520 6968
TIME...MOT...LOC 2218Z 323DEG 13KT 4514 6958
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH
SMPreliminary Local Storm Report
National Weather Service Caribou ME
623 PM EDT Fri Jun 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM Flood 1 ENE Sebec 45.28N 69.10W
06/12/2026 Piscataquis ME Trained Spotter
report of Old Brownville Road washed out in
places.
&&Preliminary Local Storm Report
National Weather Service Caribou ME
624 PM EDT Fri Jun 12 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0530 PM Hail 1 ENE Sebec 45.28N 69.10W
06/12/2026 E0.25 Inch Piscataquis ME Trained Spotter
&&The Caribou radar (KCBW), 125 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees were toppled in the vicinity of Brownville Junction by wind gusts estimated at up to 60 mph. Several trees were up to 2 feet in diameter. Trees ranging from 3 to 8 inches in diameter were toppled along Quarry Road. The time is estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2026Every state in 2026This day in weather historyWarnings in Maine, June 2026
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: 1347380.