Low pressure tracking across northern Maine pulled a cold front across the region through the afternoon into the evening of the 9th. Thunderstorms developed in advance of the front.
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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.
Low pressure tracking across northern Maine pulled a cold front across the region through the afternoon into the evening of the 9th. Thunderstorms developed in advance of the front. Some storms became severe producing damaging winds.
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 Aug 9, 9:56 AM EST, 2 hours 18 minutes earlier.
Area Forecast Discussion National Weather Service Caribou ME 1056 AM EDT Thu Aug 9 2018 .SYNOPSIS... Low pressure will track across the northern parts of the state today. The low will continue into the Maritimes tonight as it pulls a cold front through. Canadian high pressure will begin building in on Friday and will crest over the region this weekend. && .NEAR TERM /THROUGH TONIGHT/... 11 AM Update: The next round of showers and thunderstorms will develop with afternoon heating and the cold fronts that will cross this afternoon and evening. The heavier showers and thunderstorms will likely develop in the sfc trof that is currently over the state and propagate towards the SE corner of the state. While cloud cover continues to look like a mitigating factor for any severe storm development, it looks like a narrow window of opportunity will develop this afternoon in a line SE of a line from Mars Hill towards Dover-Foxcroft. With brief clearing and heating above 80F... and dew points above 70F, strong storms could quickly form and move southeastward. With strong cooling aloft as the upper trough approaches, ample SBCAPE will quickly become available along with sufficient bulk shear for storm organization. The 12Z GYX sounding reflects this potential. The entrance to a strong upper jet will also intersect this area during the afternoon. Have added mention of some severe storms, gusty winds and small hail with the thunderstorms in the aforementioned area of concern. Orgnl Disc: Rain/Shwrs are filling in across the Rgn from QB, spcly across the N. Some ptns of the NW already have received 1 to 2 inches with the heaviest amts near the QB border where we have already issued an flood adv for small streams. Sig rnfl will move into NE ptns of the FA ovr the next few hrs with lesser amts to the S xcpt Downeast areas where a cluster of heavier shwr/tstms are movg NE toward SE NB. Behind the initial s/wv resulting in this current batch of shwrs and embedded tstms,there could be a relative break in the action where shwrs become lighter and more scattered. Models then indicate the potential of another line of shwrs with sct tstms forming later this aftn from NERN to Cntrl ptns of the FA just ahead of a cold front with tstm intensity potential being dependent on how much sunshine/sfc htg occurs prior to development. For now, we mention hvy downpours and gusty winds as enhanced elements with the worst case scenario being lclzd svr stms due to bowing ln segments due to 30 to 35 kt of 0-6km bulk shear. Hi temps will be cooler again due to xtnsv cld cvr and shwrs. Tstms will end by erly to mid eve and shwrs will become sct and lgtr this eve behind the cold front with shwrs ending late tngt leaving some low SC cldnss across Nrn ptns of the FA. Ovrngt lows by daybreak Fri will be cooler under the influence of a NW breeze than the last few morns, with a noticeable drop in humidity. && .SHORT TERM /FRIDAY THROUGH SATURDAY/... Low pressure will be exiting through the northern Maritimes on Friday as Canadian high pressure builds in from central Canada. This will push some of the coolest weather we have seen in a long time across the area Friday with highs over the north only near 70 and highs Downeast in the mid to upper 70s. Cool air in the mid levels will likely result in lots of cumulus clouds, especially over the north, making the day partly cloudy to at times mostly cloudy. This will be followed by a clear and cool night Friday night as high pressure crests over the region. Some steam fog is likely along the rivers by sunrise Saturday morning, especially over the north. High pressure will remain across the area Saturday bringing a mostly sunny and seasonable day as upper level ridging builds back over the area. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... High pressure will remain over the area Saturday night bringing a tranquil night followed by mostly sunny and quiet day on Sunday. Upper level ridging will remain over the area Sunday while weak surface high pressure slowly begins to drift east of the region. This will bring another mostly sunny day with temperatures a little warmer than Saturday. Monday will remain dry, tranquil and warm. However, the upper level ridge will begin to break down as low pressure along the Mid-Atlantic coast supported by a trough in the Midwest begins to lift north. This will bring increasing clouds, mainly Downeast, late in the day. However, Monday should remain dry across the region. Moisture ahead of the Midwestern trough will lift north across the area Tuesday bringing increasing clouds over the rest of the region with a chance of some rain, mainly Downeast early and over the rest of the region during the afternoon. Showers may continue into Wednesday as the trough opens and lifts northeast across the area. && .AVIATION /15Z THURSDAY THROUGH MONDAY/... NEAR TERM: IFR clgs and vsbys are xpctd all sites til mid morn with shwrs and patchy fog. Aftwrds, conditions will improve to MVFR late this morn and erly aftn, and even low VFR with intermittent reductions to MVFR/IFR with any tstm or heavier shwrs. Downeast sites will remain VFR tonight, with Nrn sites potentially MVFR late tngt with cold advcn SC. SHORT TERM: VFR conditions are expected across the entire area Friday through the weekend. The exception may be some patchy river valley steam fog early Saturday morning across parts of the north. && .MARINE... NEAR TERM: No hdlns anticipated thru this ptn of the fcst with areas of marine fog persisting in the eve hrs as moist tropical air conts to flow N ovr the cold Gulf of ME waters, followed by improving vsbys behind the cold front later tngt. Went with about 75 to 80 percent of WW3 wv guidance wv hts for this fcst with primary wv spectra pds in the 4 to 7 sec wind driven and 8 to 12 sec swell range. SHORT TERM: Winds and seas will remain below SCA Friday through the weekend with tranquil weather expected as high pressure moves across the waters. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...None. && Near Term...VJN/MCW Short Term...Bloomer Long Term...Bloomer Aviation...VJN/Bloomer Marine...VJN/Bloomer
Hazardous Weather Outlook National Weather Service Caribou ME 306 AM EDT Thu Aug 9 2018 MEZ001>006-010-011-015>017-029>032-101100- 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- 306 AM EDT Thu Aug 9 2018 This Hazardous Weather Outlook is for Coastal DownEast Maine, 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. Locally heavy rainfall is possible through today. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. 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. ANZ050>052-101100- 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- 306 AM EDT Thu Aug 9 2018 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...Friday through Wednesday. 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
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
810 AM EDT THU AUG 9 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0645 AM TSTM WND DMG 1 NW ALLAGASH 47.09N 69.06W
08/07/2018 AROOSTOOK ME PUBLIC
TWO TREES DOWN IN TOWN.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CARIBOU ME
850 AM EDT THU AUG 09 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0850 AM HEAVY RAIN 2 NE FORT FAIRFIELD 46.79N 67.80W
08/09/2018 M1.90 INCH AROOSTOOK ME TRAINED SPOTTER
&&
EVENT NUMBER CAR1801328
NORTONRThe Portland,ME radar (KGYX), 152 km away, was scanning. The volume nearest the first event began at 17:11 UTC.
5 thunderstorm wind. Local standard time, as filed.
Trees and power poles were toppled and snapped on Budget Road...Black Road and Union Street by wind gusts estimated at up to 70 mph.
Between 15 and 20 trees and around 10 power poles were toppled or snapped by straight-line wind gusts estimated at up to 70 mph. Portions of a metal roof were also torn from a barn. The damage occurred along an approximately 1 mile portion of Route 15 near Kenduskeag.
A tree was toppled on to a house on Lancaster Brook Road by wind gusts estimated at 65 mph. The time is estimated.
A tree was toppled on Masthill Road...with another tree toppled on Williams Pond Road...by wind gusts estimated at 60 mph. The toppled tree on Williams Pond Road also brought down power lines.
Around 15 trees were toppled or snapped on Main Street and Silver Street by straight-line wind gusts estimated at up to 70 mph. The winds also damaged the roof of a mobile home.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maine in 2018Every state in 2018This day in weather historyWarnings in Maine, August 2018
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: 782218, 782219, 782220, 782221, 782222.