Showers and thunderstorms developed during the afternoon of the 12th in advance of an approaching cold front. An upper level disturbance also crossed the region.
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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.
Showers and thunderstorms developed during the afternoon of the 12th in advance of an approaching cold front. An upper level disturbance also crossed the region. Several of the thunderstorms became severe producing damaging winds. Around 4000 customers lost power in an area from Millinocket to Medway. The showers and thunderstorms persisted into the evening.
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, 1:39 PM EST, 1 hour 56 minutes earlier.
Area Forecast Discussion National Weather Service Caribou ME 239 PM EDT Mon Jun 12 2017 .SYNOPSIS... A cold front will cross the area late tonight and early Tuesday followed by Canadian high pressure for the mid to late week. && .NEAR TERM /THROUGH TUESDAY/... Showers and thunderstorms will continue into early this evening across parts of the region, mainly over the east central areas. The potential for some isolated strong storms will exist, mainly over east central areas. Showers should then dissipate later this evening as a cold front pushes south across the area. The front will reach the coast early Tuesday morning and some stray showers are possible near the coast as the front presses into some lingering humid air Downeast. Northern areas will begin clear late tonight. Clearing will progress down from the north on Tuesday giving way to a sunny, drier afternoon across the area. Tuesday will be warm over the area with highs from the low to mid 70s north to low 80s Downeast. However, the air will become noticeably drier during the afternoon with dew points dropping to near 40 across the north and mid 50s Downeast by late in the day. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... On Tuesday night, cold air advection continues with gusty northwest winds through the night. These winds will maintain a well-mixed boundary layer, but the cold air advection will be sufficient to drop lows into the 40s across the area. The northwest winds and cool temperatures continue on Wednesday. With daytime mixing, gusts to 25 mph can be expected...mostly in Aroostook County and a bit less further south. Highs will be in the mid to upper 60s in northern zones and in the lower 70s for Bangor and the Down East region. The offshore flow means coastal locations will be the warmest spots in the forecast area. Thin fair weather cumulus can be expected to produce some cloudiness over northern zones by late morning into the afternoon. The high will settle over the region Wednesday night with good radiational cooling under clear skies. Again, lows will be in the 40s except in the Allagash where 30s are forecast. Thursday will be another pleasant day with light winds and warmer temperatures. All locations should reach the lower 70s with low humidity. Late morning and afternoon cumulus fields will reduce sunshine in northern zones. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... In the longer term forecast beginning Thursday night, the period of pleasant weather will come to an end as the high moves offshore and a southerly flow sets up ahead of persistent upper troughs in northern Ontario. In general, it looks like the high will amplify as it moves offshore and serve to block and weaken fronts propagating from the west late week into the weekend. The first front will be a weak occlusion arriving Friday or Friday night. Some precipitation will fall with this front, but with a weakening shortwave running into a ridge, it would seem that some models such as 12/12Z ECMWF and GEMS may be too robust with QPF. The occlusion's main purpose will be the introduction of warmer and more humid air. When this warm air reaches the surface is uncertain as a moist marine flow will prevail Friday and Saturday and keep the area under an inversion until a warmer southwest wind begins. For now, will bring in the warmer and humid air on Sunday. This will be mostly inland as the coast will stay under the influence of an onshore flow. With the warmer air in place inland, concern turns to a cold front that various models have arriving later Sunday or Sunday night. This front could produce some convection and have maintained thunderstorms in the forecast for later Sunday. It appears that any fair weather behind this front will be brief as the upper low re- establishes itself in Ontario and sends another front towards Maine later Monday. With timing uncertainties involving up to three fronts, maintained chance pops Friday into Monday night. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... NEAR TERM: VFR conditions are expected across the area tonight and Tuesday with the localized exception of some IFR conditions in any showers or thunderstorms early this evening. SHORT TERM: Expect VFR conditions until late Friday night into Saturday morning when MVFR tempo IFR conditions due to cigs are anticipated. && .MARINE... NEAR TERM: Winds and seas are expected to be below SCA tonight and Tuesday. Some isolated thunderstorms are possible over the waters early tonight. SHORT TERM: A few gusts towards 20 kts with some 3 to 4 foot seas can be expected on Wednesday before winds and seas subside Thursday and Friday. Some longer period swell towards 5 feet may arrive Sunday into Monday and could result in an SCA. More humid air arriving Saturday night into Sunday could mean fog. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...None. && Near Term...Bloomer Short Term...MCW Long Term...MCW Aviation...Bloomer/MCW Marine...Bloomer/MCW
Hazardous Weather Outlook National Weather Service Caribou ME 646 AM EDT Mon Jun 12 2017 MEZ001>006-010-011-015>017-031-032-131100- Northwest Aroostook-Northeast Aroostook-Northern Somerset- Northern Piscataquis-Northern Penobscot-Southeast Aroostook- Central Piscataquis-Central Penobscot-Southern Penobscot- Interior Hancock-Central Washington-Southern Piscataquis- Northern Washington- 646 AM EDT Mon Jun 12 2017 This Hazardous Weather Outlook is for East Central Maine...Eastern Maine...Far Northern Maine...Interior DownEast Maine...North Central Maine...Northern Maine and West Central Maine. .DAY ONE...Today and Tonight. A warm front will lift north of the region today as an upper level disturbance crosses the region from the west. Scattered showers and thunderstorms are expected to develop this afternoon. Some of the storms could contain gusty winds and small hail. The Storm Prediction Center has placed much of the region in a marginal risk for severe weather. However, it appears as if the greatest threat will be across central areas and into interior down east. Showers and thunderstorms are possible into this evening as a cold front approaches from the northwest. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. 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>052-131100- 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- 646 AM EDT Mon Jun 12 2017 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...Tuesday through Sunday. 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. MEZ029-030-131100- Coastal Hancock-Coastal Washington- 646 AM EDT Mon Jun 12 2017 This Hazardous Weather Outlook is for Coastal DownEast Maine. .DAY ONE...Today and Tonight. The Maine Department of Environmental Protection has issued an air quality action day today for elevated levels of ground level ozone in coastal Hancock county, especially the higher elevations of Acadia Park, until 11 pm tonight. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. 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.
The Caribou radar (KCBW), 9 km away, was scanning. The volume nearest the first event began at 20:33 UTC.
7 thunderstorm wind. Local standard time, as filed.
Trees and power lines were toppled on Putnam Avenue...North Street and along Route 1 by wind gusts estimated at 60 mph. The time is estimated.
Several trees were toppled around town by wind gusts estimated at 60 mph. The time is estimated.
A tree was toppled on Lake Road by wind gusts estimated at 65 mph. The time is estimated.
Trees were toppled across the driveway of a home near Smith Pond by wind gusts estimated at 65 mph. The time is estimated.
Several trees were toppled around town by wind gusts estimated at 65 mph. The time is estimated.
Around 50 trees were toppled or snapped in Medway by wind gusts estimated at 70 mph. Power lines were also toppled.
Trees and power lines were toppled around town by wind gusts estimated at 65 mph. The time is estimated.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2017Every state in 2017This day in weather historyWarnings in Maine, June 2017
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: 708145, 708151, 708144, 708146, 708149, 708147, 708150.