On June 28th a weak upper level shortwave interacted with modest shear and CAPE to create enough energy to trigger a few isolated thunderstorms. One area of storms across central Maine, grew stronger enough for isolated severe hail and wind gusts.
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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 GYX wrote it up.
On June 28th a weak upper level shortwave interacted with modest shear and CAPE to create enough energy to trigger a few isolated thunderstorms. One area of storms across central Maine, grew stronger enough for isolated severe hail and wind gusts.
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 Jun 28, 1:52 PM EST, 2 hours 44 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Gray ME 252 PM EDT Sun Jun 28 2026 .WHAT HAS CHANGED... Confidence continues to increase in the potential for significant heat in the Wednesday through Friday timeframe. && .KEY MESSAGES... 1. Pleasant conditions, with a few passing showers this afternoon/evening, continue through Monday. 2. Hot and Humid conditions arrive this week, with near record breaking heat increasingly likely for mid to late week. Any preparations, such as installing air conditioning units, would best be completed early this week before the hottest conditions begin on Wednesday. && .DISCUSSION... KEY MESSAGE 1 DESCRIPTION... Daytime cumulus will continue this afternoon, with deeper structures supporting a brief shower or rumble of thunder. These seem most likely across interior and mountain areas through early evening before daytime heating subsides. Like last evening, there is the chance for an isolated shower to continue through the late evening and overnight hours, but these should be few and far between. Fog bank that had been in vicinity of the bays/harbors yesterday and overnight has retreated 20 to 30 miles off the coast. This should be a good buffer to keep prevent additional widespread dense fog tonight. But, with little shift in airmass, can't rule out some fog development along the coast and Midcoast later this evening and overnight. Monday continues warmer, but a drier atmospheric column should keep showers at bay. Temperatures climb into the mid to upper 80s outside of the mountains, but an afternoon sea breeze should offer some relief along the coast. KEY MESSAGE 2 DESCRIPTION... The warming trend continues on Tuesday with widespread highs in the 80s across the interior. Along the coast, onshore flow likely keeps highs mainly in the 70s for one more day. By Wednesday, the significant heat likely arrives into at least New Hampshire and western Maine as highs warm into the 90s. What makes this heat event notable is just how much moisture will accompany the heat. Dew points likely push into the low to mid 70s on Wednesday, pushing heat indices into the triple digits where temps reach the 90s. These high dew points continue through at least Friday. One possible limiting factor for the heat remains the potential for rounds of convection originating near the Great Lakes, and riding around the ridge into New England. Should these arrive during the midday timeframe, they would serve to limit the heating potential. But arriving at any other time of the day, they will likely only serve to increase dew points. We'll likely have to wait until Tuesday to have a better handle on how these will effect temperatures in the Wednesday through Friday time frames, as the differences will be localized and variable. Outside of any convection, the heat looks most likely to peak on Thursday and Friday. Modeled 850mb temps of 22-24C support the potential for near record high temps of 97-102 degrees, barring any hinderance from convection or sea breezes. It would be a misuse of time to tinker with which side of 100 temperatures will reach in the Thursday and Friday timeframe at this point in time. The main message remains that heat and humidity hazardous to health is increasingly likely as heat indices push 110 degrees by Thursday. Additionally, the trend over the last few model runs has been for an increasing chance of the heat to continue into at least Friday of Saturday. The models first trended warmer for Wednesday and Thursday over the last few days, and now look to be trending this way for Friday and Saturday as well. We will continue to watch the progression of this, with a trough and cooler conditions situated just to our east across Atlantic Canada. Across the Northeast US as a whole, this heat wave is shaping up to look similar to some of the more notable events from history, such as the 1911 and 1966 heat waves. For northern New England, there remains some uncertainty on how high temps will climb with convection and potential sea breezes offering opportunities for some relief. But record breaking or not it's going to be hot, and individuals sensitive to heat and those working or playing in the heat should take precautions to limit exposure to it mid to late this week. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/... Through 18z Monday...Mostly VFR expected except for valley locations that see another night of FG w/ LIFR vis/cig. Fog shouldn't be as widespread along the ME/NH coast tonight, but can't rule out dips to 3 or 4SM with 1SM towards RKD. SHRA and possible TS through early evening, mostly for interior ME and central/northern NH terminals. Outlook: Monday Night: Chance for the return of fog along the coast hinges on how robust it is over the coastal waters through Monday. It is likely this does not return until after 00z. Tuesday - Friday: Mainly VFR prevails at most terminals, but rounds of showers and storms will be possible each day. Marine fog will be possible at RKD. && .MARINE... Marine stratus or fog seems likely to remain around the coastal waters for much of the coming week in between systems. High pressure gradually settles south of the waters by midweek. Mainly fair conditions prevail, but some seas to near 5ft are possible Tuesday night in southwesterly flow. && .CLIMATE... High temperature records at long term climate sites... July 1st 2nd 3rd AUG 92 93 94 PWM 93 98 95 CON 99 98 102 && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && DISCUSSION...Clair/Cornwell
The Portland,ME radar (KGYX), 74 km away, was scanning. The volume nearest the first event began at 21:36 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
Severe thunderstorms dropped hail the size of quarters on Great Pond in the Belgrade Lakes Region.
Severe thunderstorm outflow wind gusts downed a large tree in front from apartment complex, in addition to smaller trees uprooted nearby in Augusta.
ASOS station KAUG Augusta reported a wind gust of 52kts.
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: 1355940, 1355942, 1355945.