while an upper level disturbance crossed the region. Thunderstorms developed across northern Maine during the afternoon.
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.
A cold front approached during the 21st...while an upper level disturbance crossed the region. Thunderstorms developed across northern Maine during the afternoon. Some of the thunderstorms became severe producing damaging winds. Microbursts occurred at two locations producing extremely strong winds. The first microburst occurred in an area from Castle Hill... to Crouseville...to southwest Caribou. Microburst winds in this area were estimated at 90 to 100 mph. The microburst originated near Castle Hill where around three dozen trees were snapped or toppled along with damage to outdoor equipment. Tree damage also occurred in the Crouseville and Washburn areas. The metal roof of a barn was damaged in southwest Caribou where the microburst diminished. A second microburst occured in Limestone where winds were estimated at 100 to 110 mph. The winds almost completely destroyed one barn...while the roof was torn from a second barn. Large trees were also snapped or toppled.
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 21, 3:27 PM EST, 1 hour 3 minutes earlier.
Area Forecast Discussion National Weather Service Caribou ME 427 PM EDT Mon Jun 21 2021 .SYNOPSIS... A cold front will approach tonight and cross the area on Tuesday. High pressure will settle over the area by the middle of the week and slide offshore on Thursday. Another system will approach from the west late in the weekend. && .NEAR TERM /THROUGH TUESDAY/... Low pressure will continue to track well north of the region tonight. A warm front will continue to lift northeast of the region early this evening with a warm and humid air mass remaining in place across the region. Scattered showers and thunderstorms are expected to continue mainly across the north Maine Woods and northern Aroostook county as the warm front lifts to the north. We have been seeing rotating storms across the north Maine Woods this afternoon and there will be the potential for severe storms across northern areas through early this evening. Thus, any storms may contain large hail and damaging winds through early this evening. Precipitable water values 1.5" to near 2.0" will result in locally heavy rainfall with any storms, thus will continue to mention heavy rain as well. Any thunderstorms across the north will be on the wane by later this evening with mainly cloudy skies overnight, along with scattered showers ahead of an approaching cold front. Warm and muggy conditions can be expected with lows generally in the low to mid 60s across the region. The cold front will slowly cross the region on Tuesday from northwest to southeast across the region. Expect scattered showers as the front crosses the region. The best chances for thunderstorms will be across east central and Downeast portions of the region. It will be cooler with highs ranging from the lower 70s across the north and mid 70s Downeast. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... Cold front wl be along the coast on Tue evening and likely to move offshore by 03z. However showers likely to continue over Downeast until daybreak as upr lvl jet finally east moves into New Brunswick. Skies wl clear with drier air mvg in behind and min temps wl dip into the 40s with possibly u30s in far nwrn Aroostook. Clear skies will be on tap thru the end of the short term with high temps on Wed below normal before rebounding to just above normal for Thursday. Thursday wl feature high pressure sliding offshore with return flow drawing in more moist air and temps topping out in the u70s/nr 80F. Given clear skies and fairly light winds expect patchy fog to dvlp briefly each morning. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Bermuda high will likley keep next system at bay thru Sat morning. Temped to rmv pops from Sat but with global Canadian indicating pcpn over the area in the aftn hv opted not to remove. Hv also retained mention of thunder in the afternoon and evng, however have dropped chcs to slgt chc as main forcing rmns back to the west. Cdfnt looks to be approaching the international border by Sun morning though guidance differs on timing and additional waves riding northeast along the bndry. Bndry appears to stall out at some point early next week as an active pattern looks to set up.&& .AVIATION /20Z MONDAY THROUGH SATURDAY/... NEAR TERM: VFR conditions early will give way to widespread IFR/LIFR in low clouds and areas of fog, especially KBGR/KBHB vicinity. Scattered thunderstorms will mainly affect the northern terminals through early this evening. Widespread IFR conditions are expected Tuesday morning to give way MVFR, then VFR in the afternoon. Scattered thunderstorms are possible in the afternoon, mainly KHUL south. S wind around 10 kt this evening, becoming W around 10 kts on Tuesday. SHORT TERM: Tue night...VFR over northern terminals with IFR improving to VFR Downeast late. NW 5-10kts. Wed...VFR. 5-10kts. Wed night...VFR. Light WSW. Thu-Fri night...VFR. S 5-10kts and gusty each afternoon. Sat...VFR becoming MVFR in the afternoon. S 5-15kts. && .MARINE... NEAR TERM: Winds/seas will generally remain below SCA levels, although a few gusts to around 25 kt are possible tonight. Visibility will be reduced to less than 1 NM in areas of fog. SHORT TERM: Seas and winds remain below SCA thresholds. Patchy fog likely to reduce visibilities over the waters thru the end of the week. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...None. && Near Term...Duda Short Term...Farrar Long Term...Farrar Aviation...Duda/Farrar Marine...Duda/Farrar
Hazardous Weather Outlook National Weather Service Caribou ME 338 AM EDT Mon Jun 21 2021 MEZ001>005-010-031-220745- Northwest Aroostook-Northeast Aroostook-Northern Somerset- Northern Piscataquis-Northern Penobscot-Central Piscataquis- Southern Piscataquis- 338 AM EDT Mon Jun 21 2021 This Hazardous Weather Outlook is for Central Highlands Maine, Far Northern Maine and North Woods Maine. .DAY ONE...Today and Tonight. A cold front will slowly approach from the west later this afternoon and tonight. Thunderstorms are expected to develop later this afternoon and into this evening. A few thunderstorms may contain gusty winds, small hail, and heavy rainfall. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. 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. MEZ006-011-015>017-029-030-032-220745- Southeast Aroostook-Central Penobscot-Southern Penobscot- Interior Hancock-Central Washington-Coastal Hancock- Coastal Washington-Northern Washington- 338 AM EDT Mon Jun 21 2021 This Hazardous Weather Outlook is for Coastal DownEast Maine, Far Eastern Maine, Interior DownEast Maine and Penobscot Valley Maine. .DAY ONE...Today and Tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Thunderstorms are possible for Tuesday afternoon ahead of a slow moving cold front. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. ANZ050>052-220745- 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- 338 AM EDT Mon Jun 21 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...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. VJN
The Caribou radar (KCBW), 81 km away, was scanning. The volume nearest the first event began at 21:31 UTC.
3 thunderstorm wind. Local standard time, as filed.
Several trees were toppled by wind gusts estimated at up to 60 mph. The time is estimated.
A severe thunderstorm produced a microburst which developed around Castle Hill and persisted through Crouseville and Washburn before ending in southwest Caribou. Around three dozen trees were snapped or toppled near Castle Hill...where some outdoor equipment was also damaged or destroyed. Tree damage was also observed in the Crouseville and Washburn areas. The metal roof of a barn was damaged in southwest Caribou before the microburst ended near Bailey Road. Maximum wind gusts with the microburst were estimated at 90 to 100 mph. The path length of the microburst was around 7 miles. The maximum path width was around 1 mile.
A severe thunderstorm produced a microburst in the Limestone area. One barn was completely destroyed. Another barn has its roof torn off. Large trees were also snapped or toppled along the nearly 5 mile path of the microburst which ended aboubt a half mile north of Limestone. One uprooted tree fell on to the roof of a house. Maximum wind speeds with the microburst were estimated at 100 to 110 mph. The maximum path width was around a half mile.
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: 966128, 965618, 965619.