A derecho crossed northern Maine during the morning and early afternoon hours. Strong winds associated with the derecho caused structural damage and extensive tree damage. Thousands of trees were toppled or snapped across Aroostook County and northern portions of Penobscot...Piscataquis and Somerset counties. Wind gusts of 60 to 70 mph were common with the derecho...with localized wind gusts of 75 to 80 mph. This was the most extensive convective wind event to affect the region in many years. In the wake of the derecho...additional thunderstorms developed across the region during the afternoon in advance of an approaching cold front. This second round of thunderstorms affected mostly central and Downeast portions of the region producing damaging winds and large hail. These thunderstorms persisted through the evening hours.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:30:00 to 03-AUG-07 11:30:00 (EST-5)
Location: CARIBOU
Magnitude: 56.00 EG
Reported by: Public

Trees and power lines were toppled across the town...leading to numerous power outages...by wind gusts estimated at 65 mph. Some structural and roof damage was also reported.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:32:00 to 03-AUG-07 11:32:00 (EST-5)
Location: CARIBOU
Magnitude: 54.00 MG
Reported by: NWS Employee

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:32:00 to 03-AUG-07 11:32:00 (EST-5)
Location: ISLAND FALLS
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:30:00 to 03-AUG-07 11:30:00 (EST-5)
Location: ASHLAND
Magnitude: 58.00 MG
Reported by: Trained Spotter

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 10:30:00 to 03-AUG-07 10:30:00 (EST-5)
Location: ALLAGASH
Magnitude: 56.00 EG
Reported by: Park/Forest Service

Numerous trees were toppled or snapped in the Allagash Wilderness Waterway from Allagash south to near Churchill Dam from wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:30:00 to 03-AUG-07 11:30:00 (EST-5)
Location: WASHBURN
Magnitude: 50.00 MG
Reported by: NWS Employee

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:59:00 to 03-AUG-07 11:59:00 (EST-5)
Location: HODGDON
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:15:00 to 03-AUG-07 11:15:00 (EST-5)
Location: ASHLAND
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled between Ashland and Portage by wind gusts estimated at 65 mph. Some trees fell on power lines.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:25:00 to 03-AUG-07 11:25:00 (EST-5)
Location: ASHLAND
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:20:00 to 03-AUG-07 11:20:00 (EST-5)
Location: MAPLETON
Magnitude: 52.00 EG
Reported by: Public

Power lines were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:51:00 to 03-AUG-07 11:51:00 (EST-5)
Location: HOULTON
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in PISCATAQUIS, MAINE
From 03-AUG-07 11:00:00 to 03-AUG-07 11:00:00 (EST-5)
Location: CHAMBERLAIN LAKE
Magnitude: 56.00 EG
Reported by: Park/Forest Service

Trees were toppled across Baxter State Park by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 12:20:00 to 03-AUG-07 12:20:00 (EST-5)
Location: GRAND ISLE
Magnitude: 56.00 EG
Reported by: Trained Spotter

Trees were toppled along Route 1 between Grand Isle and Madawaska by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 12:10:00 to 03-AUG-07 12:10:00 (EST-5)
Location: STOCKHOLM
Magnitude: 61.00 EG
Reported by: NWS Storm Survey

Hundreds of trees were toppled or snapped at Madawaska Lake by wind gusts estimated at 70 mph. A pontoon boat located at a dock was flipped by the winds. While most of the damage was attributed to straight line winds...a brief gustnado possibly occurred on the leading edge of the squall line.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:32:00 to 03-AUG-07 11:32:00 (EST-5)
Location: CRYSTAL
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:28:00 to 03-AUG-07 11:28:00 (EST-5)
Location: NEW SWEDEN
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:25:00 to 03-AUG-07 11:25:00 (EST-5)
Location: MASARDIS
Magnitude: 65.00 EG
Reported by: Public

The roof was torn from a paper mill building by wind gusts estimated at 75 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:28:00 to 03-AUG-07 11:28:00 (EST-5)
Location: MARS HILL
Magnitude: 56.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:36:00 to 03-AUG-07 11:36:00 (EST-5)
Location: LIMESTONE
Magnitude: 56.00 EG
Reported by: NWS Employee

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:35:00 to 03-AUG-07 11:35:00 (EST-5)
Location: OXBOW
Magnitude: 56.00 EG
Reported by: Public

Numerous trees were toppled by wind gusts estimated at 65 mph...causing the road between Oxbow and Route 11 to be closed until the trees could be removed.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:30:00 to 03-AUG-07 11:30:00 (EST-5)
Location: CARIBOU
Magnitude: 56.00 EG
Reported by: NWS Employee

An old barn was destroyed and trees were toppled and broken along Route 1 by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 12:10:00 to 03-AUG-07 12:10:00 (EST-5)
Location: STOCKHOLM
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 12:15:00 to 03-AUG-07 12:15:00 (EST-5)
Location: VAN BUREN
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled by wind gusts estimated at 65 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:05:00 to 03-AUG-07 11:05:00 (EST-5)
Location: PORTAGE
Magnitude: 61.00 EG
Reported by: Park/Forest Service

Significant wind damage occurred with trees toppled or broken in a 100 foot wide path approximately a half mile long near Big Machias Lake. Other pockets of significant tree damage were observed in the same area. The damage appeared to be caused by straight line wind gusts estimated at 70 mph.

Thunderstorm Wind in PISCATAQUIS, MAINE
From 03-AUG-07 14:15:00 to 03-AUG-07 14:15:00 (EST-5)
Location: GREENVILLE
Magnitude: 52.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 15:45:00 to 03-AUG-07 15:45:00 (EST-5)
Location: EAST MILLINOCKET
Magnitude: 52.00 EG
Reported by: Law Enforcement

Power lines were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 15:40:00 to 03-AUG-07 15:40:00 (EST-5)
Location: MEDWAY
Magnitude: 52.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 17:15:00 to 03-AUG-07 17:15:00 (EST-5)
Location: LEVANT
Magnitude: 56.00 EG
Reported by: Trained Spotter

Many trees were toppled across the town by wind gusts estimated at 65 mph.

Hail in PENOBSCOT, MAINE
From 03-AUG-07 18:06:00 to 03-AUG-07 18:06:00 (EST-5)
Location: BANGOR
Magnitude: 0.75 
Reported by: Public

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:25:00 to 03-AUG-07 11:25:00 (EST-5)
Location: PRESQUE ISLE
Magnitude: 56.00 EG
Reported by: Public

Trees and power lines were toppled across the town...leading to numerous power outages...by wind gusts estimated at 65 mph. A metal storage shed at Wal Mart was blown on to a vehicle in the parking lot.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 05:30:00 to 03-AUG-07 05:30:00 (EST-5)
Location: SAINT PAMPHILE
Magnitude: 52.00 EG
Reported by: Public

Thunderstorm Wind in PISCATAQUIS, MAINE
From 03-AUG-07 10:20:00 to 03-AUG-07 10:20:00 (EST-5)
Location: KOKADJO
Magnitude: 52.00 EG
Reported by: COOP Observer

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 11:32:00 to 03-AUG-07 11:32:00 (EST-5)
Location: PATTEN
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled on to Route 11 north of Patten causing the road to be closed to traffic until the trees were cleared.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 10:30:00 to 03-AUG-07 10:30:00 (EST-5)
Location: ALLAGASH
Magnitude: 52.00 EG
Reported by: Trained Spotter

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PISCATAQUIS, MAINE
From 03-AUG-07 10:20:00 to 03-AUG-07 10:20:00 (EST-5)
Location: CHURCHILL DAM
Magnitude: 52.00 EG
Reported by: Public

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 11:10:00 to 03-AUG-07 11:10:00 (EST-5)
Location: PATTEN
Magnitude: 56.00 EG
Reported by: Public

Trees were toppled at Grand Lake Matagamon by wind gusts estimated at 65 mph.

Hail in PENOBSCOT, MAINE
From 03-AUG-07 17:20:00 to 03-AUG-07 17:20:00 (EST-5)
Location: BANGOR
Magnitude: 0.75 
Reported by: Public

Hail in PISCATAQUIS, MAINE
From 03-AUG-07 13:30:00 to 03-AUG-07 13:30:00 (EST-5)
Location: CHAMBERLAIN LAKE
Magnitude: 0.75 
Reported by: Trained Spotter

Penny sized hail was reported at Munsungan Lake.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 11:40:00 to 03-AUG-07 11:40:00 (EST-5)
Location: CONNOR
Magnitude: 56.00 EG
Reported by: Public

Numerous trees and power lines were toppled by wind gusts estimated at 65 mph.

Hail in PISCATAQUIS, MAINE
From 03-AUG-07 14:15:00 to 03-AUG-07 14:15:00 (EST-5)
Location: GREENVILLE
Magnitude: 0.88 
Reported by: Post Office

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 16:45:00 to 03-AUG-07 16:45:00 (EST-5)
Location: NEWPORT
Magnitude: 52.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in AROOSTOOK, MAINE
From 03-AUG-07 16:25:00 to 03-AUG-07 16:25:00 (EST-5)
Location: HOULTON
Magnitude: 52.00 EG
Reported by: Law Enforcement

Trees were toppled by wind gusts estimated at 60 mph.

Thunderstorm Wind in PENOBSCOT, MAINE
From 03-AUG-07 16:30:00 to 03-AUG-07 16:30:00 (EST-5)
Location: CORINNA
Magnitude: 56.00 EG
Reported by: Amateur Radio

Large trees were toppled on to power lines by wind gusts estimated at 65 mph.

Hail in PENOBSCOT, MAINE
From 03-AUG-07 18:31:00 to 03-AUG-07 18:31:00 (EST-5)
Location: ORONO
Magnitude: 0.88 
Reported by: Public

Hail in WASHINGTON, MAINE
From 03-AUG-07 21:03:00 to 03-AUG-07 21:03:00 (EST-5)
Location: WOODLAND
Magnitude: 0.75 
Reported by: Public

Hail in WASHINGTON, MAINE
From 03-AUG-07 21:29:00 to 03-AUG-07 21:29:00 (EST-5)
Location: CALAIS
Magnitude: 1.00 
Reported by: Trained Spotter