A late summer hot and unstable airmass was in place on the afternoon of September 6th across interior Maine. A pre-frontal trough ahead of a surface cold front was approaching the state by the afternoon hours.
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 GYX wrote it up.
A late summer hot and unstable airmass was in place on the afternoon of September 6th across interior Maine. A pre-frontal trough ahead of a surface cold front was approaching the state by the afternoon hours. Discrete thunderstorms developed across Western Maine with most of them remaining below severe strength. One stronger storm was able to produce damaging wind gusts in the Cumberland County Lakes Region.
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 Gray, ME wrote its last area forecast discussion before the first event at Sep 6, 1:03 PM EST, 1 hour 47 minutes earlier.
Area Forecast Discussion National Weather Service Gray ME 203 PM EDT Sat Sep 6 2025 .SYNOPSIS... Showers and thunderstorms move through the area this afternoon and evening. Thunderstorms may be severe, containing heavy rain and capable of producing damaging winds. Hail and a brief tornado are also possible. Storms will weaken tonight. Showers may linger near the coast through Sunday before clearing out. Then another stretch of dry weather is anticipated through the end of next week. && .NEAR TERM /THROUGH SUNDAY/... Signs continue to point to an active day as a cold front approaches this afternoon with a warm, humid, and unstable environment awaiting its arrival, resulting in thunderstorms increasing in coverage and intensity with extra left present being in the right entrance region of an upper- level jet streak. SPC mesoanalysis has instability on the order of 1500 J/kg this afternoon with effective shear around 50 kt, which is more than sufficient to support strong to severe storms with the highest threat south and east of the mountains, although CAMs do hint at more potential for storms farther north compared to how things were portrayed yesterday. The marine layer may act to keep the severe threat lower toward the Midcoast. All severe weather hazards are possible this afternoon, including a couple of tornadoes with clockwise turning hodographs, especially in any discrete cells. The most favorable effective SRH is across southern NH and into SW ME. Later on the primary threat will be damaging winds as things congeal and storm mode becomes more linear. Even with the ongoing drought conditions, deep warm cloud layers and high PWATs support very efficient rain rates that could result in ponding of water on roadways along with urban and poor drainage issues, especially in training showers and storms. Localized amounts of 1 to 2 inches of rainfall are possible with thunderstorms this afternoon with additional rainfall tonight into Sunday. The severe threat is expected to quickly decrease with sunset and the loss of daytime heating in the 8 to 10 PM window. Once the line of thunderstorms diminishes and/or pushes offshore this evening, cloudy and showery weather will continue through tonight and Sunday. This is due to the frontal boundary stalling out somewhere over the Gulf of Maine and waves of low pressure riding along it with lift being further aided by northern New England remaining in the right entrance region of an upper jet. This will be primarily south and east of the mountains with even higher chances stretching from southern NH and along the ME coast and coastal plain. With the front clearing land areas it will be cooler with lows generally in the 50s tonight and highs in the 60s on Sunday. && .SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/... Showers will come to an end Sunday evening into Sunday night as a shortwave trough nudges the frontal boundary off to the south and east. A bigger push of cooler and drier air from high pressure building into the Northeast will clear out skies, but may also allow fog to develop, especially in areas that receive rain on Sunday. Lows will be mostly in the 40s. && .LONG TERM /MONDAY THROUGH SATURDAY/... Pattern Overview: High pressure is going to dominate the pattern through next week, so despite 500mb shortwave troughing, lack of moisture will lead to little in the way of chances for precipitation. Impacts and Key Messages: * Temperatures look to fall near freezing Monday night in northern zones which may lead to patchy frost development. * Little in the way of chances for precipitation through next week will continue to maintain drought conditions. Details: Monday: High pressure builds back into the region Monday bringing clear skies and a cooler and drier airmass. Temperatures climb into the low to mid-70s south of the mountains, and into the low to mid-60s to the north. Deep mixing drops dewpoints into the 40s, so this is likely going to feel like a pleasant Fall day. Clear skies continue into Monday night with calming winds, so expecting decoupling and efficient radiational cooling overnight. 850mb temperatures at this time look to only be in the range of +4-6C north to south, so surface temperatures dropping close to freezing in northern zones is possible, which would result in patchy frost development. Currently keeping temperatures close to the NBM which brings them down into the mid to upper 30s, but it is worth noting that some of the normally colder guidance has 32F in parts of northern New Hampshire. South of the mountains see a chilly night as well with temperatures dropping into the low to mid-40s. Tuesday and Wednesday: Tuesday looks mostly clear as well with the exception being on the coastal plain where high clouds may start to move in from the south in the afternoon as a low pressure system advances up the East Coast. Zonal flow aloft continues to keep temperatures on the cooler side with low to mid 70s likely on both Tuesday and Wednesday for highs. High clouds advance into the north Tuesday night with thicker clouds making there way into the coastal plain. This will likely have some effect on efficient cooling, but temperatures look to still fall into the low 40s in the north, and mid- to upper 40s in the south. Wednesday look like a cloudier day all around as low pressure makes its pass at sea and broad 500 mb troughing moves into the region. Models agree that precipitation associated with the low is going to remain offshore, but an isolated shower making it to the immediate coast is not out of the question. Skies become clearer Wednesday night but not totally, so low temperatures should be similar to Tuesday night. Thursday-Saturday: 500mb troughing stays locked in over the region through late week, but with lack of moisture in the low levels due to the surface high pressure, this likely only results more in the way of afternoon cumulus. The northwesterly flow aloft will also continue to keep temperatures on the cooler side, with highs only in the mid- to upper 60s by Saturday. Long story short, lack of precipitation through the extended forecast period is likely going to maintain current drought conditions with rainfall deficits being as high as they are. && .AVIATION /17Z SATURDAY THROUGH WEDNESDAY/... Short Term...Showers and thunderstorms will crosses the area into this evening with TEMPO IFR restrictions look likely for most terminals with the potential for strong wind gusts and possibly hail. Thunderstorms are expected to decay in the 00Z-02Z window this evening, but the cold front will get hung up in the vicinity, likely keeping showery weather through tonight and at least a part of Sunday. In addition to the showers, IFR ceilings and possibly fog will be present at times, especially along the coast. Conditions should improve later Sunday and continue into Sunday night as drier air begins to move in, but fog could develop in areas that get rainfall on Sunday. Long Term...VFR conditions are expected through the long term forecast period as high pressure settles in overhead. Valley fog is likely in at least the northern valleys each night, so IFR restrictions are possible at HIE and LEB, but dry conditions may hinder it elsewhere. && .MARINE... Short Term...SCA conditions continue today ahead of a cold front, which will bring showers and storms to the region this afternoon and evening. Some of these could move offshore and could be strong to severe. The front will cross into the waters this evening and tonight and looks to get hung up somewhere over the Gulf of Maine. Weak low pressures riding along the boundary will keep showery conditions through tonight and Sunday the frontal boundary pushes off to the south and east Sunday night. Long Term...Wind gusts and seas remain below SCA criteria through the long term forecast period as high pressure becomes dominate over the region. Some showers are possible over the waters on Wednesday as low pressure makes a close pass to the Gulf of Maine, otherwise fair weather will prevail with gusts less than 15kts and seas generally 2-3ft. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until 2 AM EDT Sunday for ANZ150-152>154. && NEAR/SHORT TERM...Combs LONG TERM...Baron
Hazardous Weather Outlook National Weather Service Gray ME 131 PM EDT Sat Sep 6 2025 ANZ154-MEZ007>009-012>014-018>025-028-033-NHZ004-006>015-071745- Coastal Waters from Cape Elizabeth, ME to Merrimack River, MA out 25 NM-Northern Oxford-Northern Franklin-Central Somerset- Southern Oxford-Southern Franklin-Southern Somerset-Interior York- Central Interior Cumberland-Androscoggin-Kennebec-Interior Waldo- Coastal York-Coastal Cumberland-Sagadahoc-Coastal Waldo- Interior Cumberland Highlands-Northern Carroll-Southern Carroll- Sullivan-Merrimack-Belknap-Strafford-Cheshire-Eastern Hillsborough- Interior Rockingham-Coastal Rockingham- Western And Central Hillsborough- 131 PM EDT Sat Sep 6 2025 ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for Atlantic coastal waters, Maine, south central Maine, southwest Maine, west central Maine, western Maine, New Hampshire, central New Hampshire, northern New Hampshire and southern New Hampshire. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. MEZ026-027-071745- Lincoln-Knox- 131 PM EDT Sat Sep 6 2025 This Hazardous Weather Outlook is for south central Maine. .DAY ONE...This afternoon and tonight. A few strong thunderstorms containing heavy rain and capaple of producing strong winds are possible this afternoon and early evening. .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. ANZ150>152-071745- Coastal Waters from Stonington, ME to Port Clyde, ME out 25 NM- Penobscot Bay- Coastal Waters from Port Clyde, ME to Cape Elizabeth, ME out 25 NM- 131 PM EDT Sat Sep 6 2025 This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This afternoon and tonight. A few strong thunderstorms containing heavy rain and capaple of producing strong winds are possible this afternoon and early evening. .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. ANZ153-071745- Casco Bay- 131 PM EDT Sat Sep 6 2025 ...SEVERE THUNDERSTORM WATCH 607 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for Atlantic coastal waters. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. NHZ001>003-005-071745- Northern Coos-Southern Coos-Northern Grafton-Southern Grafton- 131 PM EDT Sat Sep 6 2025 This Hazardous Weather Outlook is for northern New Hampshire. .DAY ONE...This afternoon 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... Spotter activation is not expected at this time.
Preliminary Local Storm Report
National Weather Service Gray ME
333 PM EDT Sat Sep 6 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0240 PM Tstm Wnd Dmg 2 E Plymouth 43.75N 71.65W
09/06/2025 Grafton NH Fire Dept/Rescue
Off-duty firefighter reported a tree down on
wires along NH-175. Time estimated by radar.
&&Preliminary Local Storm Report
National Weather Service Gray ME
335 PM EDT Sat Sep 6 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0240 PM Tstm Wnd Dmg 2 SE Plymouth 43.74N 71.66W
09/06/2025 Grafton NH Public
Three trees down on North Ashland road in
Plymouth. Largest was about 10 inches. Time
estimated by radar.
&&Preliminary Local Storm Report
National Weather Service Gray ME
337 PM EDT Sat Sep 6 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0305 PM Hail 3 SE Winchester 42.74N 72.35W
09/06/2025 M1.50 Inch Cheshire NH Public
Hail as large as ping pong balls fell for
almost 10 mins. Time estimated by radar.
&&The Portland,ME radar (KGYX), 42 km away, was scanning. The volume nearest the first event began at 19:47 UTC.
1 thunderstorm wind. Local standard time, as filed.
Severe thunderstorm outflow wind gusts downed a large pine tree and power-lines blocking Highland Rd. in Bridgton.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2025Every state in 2025This day in weather historyWarnings in Maine, September 2025
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: 1295867.