Knox County, Maine
Tornadoes, hail, floods and severe storms recorded here between 1969 and 2026, from NOAA's Storm Events Database. Search an address to see which tornadoes came closest to it.
1
Tornado reports
11
Hail reports
53
Floods since 1996
396
All events
1
Deaths
$25.3M
Property damage
Tornado paths in Knox County
The part of each tornado’s path NOAA recorded in this county, 1 in all. Zoom in and the paths widen to their surveyed width.
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Year by year
All storm eventsTornadoes
NOAA's storm database records tornadoes back to 1950 and hail and thunderstorm wind back to 1955, but floods only from 1996 on. Older floods are missing here. For those, the U.S. Geological Survey's stream gauge records and flood reports are the place to look.
Most significant events
The strongest tornadoes, deadliest events and biggest damage here, up to 50.
The astronomical tide in Portland was 11.2 feet (MLLW) at 1205 pm. Flood stage is 12 feet (MLLW). The gale to storm force onshore winds produced a storm surge of 3.37 feet in Portland Harbor. The resulting storm tide topped out at 14.57 feet (MLLW) in the Forest City with the tid…
An intense and rapidly deepening area of low pressure over the Great Lakes region (975 mb) combined with modestly high astronomical tides to produce the third highest storm tide ever in Portland (records 1912-present). Further up the Maine coast the storm surge was slightly highe…
An intense and rapidly deepening area of low pressure over the Great Lakes region (975 mb) combined with modestly high astronomical tides to produce the third highest storm tide ever in Portland (records 1912-present). Further up the Maine coast the storm surge was slightly highe…
Heavy rain with reports up to 6.5 inches fell in a short period of time lead to excessive run-off with numerous roads closed and damaged due to flooding in Knox County. The towns that were hardest hit included Appleton, Camden, Hope, Rockland, Rockport and Thomaston.
Drought Drought
The USDM on April 28 had 85% of Knox County in Severe Drought (D2), but by the end of May severe drought was completely cleared (0%), leaving only 6% in Moderate Drought (D1) and 94% in Abnormally Dry (D0) conditions. May rainfall averaged 6.11 inches, well above normal by 2.47'.…
Drought Drought
Knox County averaged 4.21 inches of precipitation in April, approximately 0.17 inches above normal. It was the driest June through April stretch on record with deficits near a foot. The USDM on March 31st had 100% of the county in Severe Drought (D2), which was reduced to 85% by …
Drought Drought
Knox County averaged 3.29 inches of precipitation in March, approximately 1.02 inches below normal, marking the 3rd driest start since the new year. It was the driest June through March stretch on record with deficits near a foot. The USDM on March 31st had 100% of the county in …
Drought Drought
Knox County averaged 0.80 inches of precipitation in February, approximately 3.52 inches below normal, making it the 2nd driest February. The USDM on February 24th had 90% of the county in Severe Drought (D2) and 10% in Moderate Drought (D1).
Winter Storm Winter Storm
Snow overspread the Midcoast by the afternoon on the 25th. Within an hour or two snow was moderate to heavy at times as an intense band of lift moved into the region. Snowfall rates were one to two inches per hour during the heavy snow. Snow continued overnight into the 26th, wit…
Drought Drought
January can be summarized by a frozen cap effect as well below normal temperatures and significant frost depths prevented any meaningful sub-surface water recharge. In addition, precipitation remained below normal for the entire region for the month. This led to a lower than norm…
Winter Storm Winter Storm
Snow overspread the area on the evening of the 23rd as a warm front approached northern New England. In the late evening stronger lift arrived and snow became moderate to heavy at times through the morning of the 24th. Light snow lingered until the afternoon before tapering off. …
Winter Storm Winter Storm
Snow overspread the Midcoast on the morning of the 2nd. Warmer air near the coast delayed the onset of accumulating snow, but steady light to moderate snow picked up in the afternoon and continued into the evening. The evening commute on the 2nd was particularly hazardous. Snow t…
Drought Drought
Knox County averaged 2.41 inches of precipitation in December, approximately 1.5 inches below normal. This contributed to the 4th driest July'December stretch on record. By late December, the county was entrenched in Severe (D2) and Extreme (D3) drought conditions, with the USDM …
Drought Drought
Knox County averaged 2.82 inches of precipitation in November, approximately an inch below normal. The rainfall deficits carried over from summer grew over 6 inches, making it the 4th driest stretch between July through November on record. By mid-November, the county was experien…
Drought Drought
Knox County averaged 2.59 inches of precipitation in September, approximately an inch below normal. The rainfall deficits carried over from summer grew near 5 inches, making it the 6th driest stretch between July through September on record. The USDM on September 30th had 84% of …
Drought Drought
Drought conditions developed across Maine in the summer of 2025. According to the August 26th, 2025 release of the United States Drought Monitor, 11% of Maine was experiencing Severe Drought, 62% was experiencing Moderate Drought and 87% was abnormally dry. Maine experienced a ra…
Winter Storm Winter Storm
Light snow overspread the area in the late evening on the 15th. This continued into the morning of the 16th when an area of strong warm air advection resulted in a laterally translating band of moderate to heavy snow. This swept through the region by the afternoon of the 16th. Pe…
Winter Storm Winter Storm
Snow overspread Midcoast Maine in the early evening of the 19th. A band of steady moderate snow developed and remained over the area into the early morning of the 20th. Snowfall totals ranged from 5 to 7 inches. Key Impacts: Heavy snow.
Thunderstorm Wind Thunderstorm Wind
Severe thunderstorm outflow winds downed a tree onto lines that blocked one lane of traffic Thomaston.
Thunderstorm Wind Thunderstorm Wind
Severe thunderstorm outflow winds downed trees and wires in Union, ME.
Thunderstorm Wind Thunderstorm Wind
Severe thunderstorm outflow winds downed trees and wires in Warren, ME. A tree also feel onto a home.
Flash Flood Flash Flood
Two road washouts with pavement buckled in downtown Camden. Other flooded roads within the community after more than 2 inches of rain fell from a slow-moving thunderstorm.
Flood Flood
Heavy rain cause excessive runoff along high terrain near Stickney Corner, flooding one lane of Route 220.
Winter Storm Winter Storm
Precipitation began during the evening of the 3rd in a warm environment, hostile to snowfall. Light rain or rain/snow mix eventually changed to snow as dynamic cooling from melting aloft occurred in heavy precipitation. Snowfall became heavy at times overnight into the morning of…
Winter Storm Winter Storm
Snowfall rates in excess of 1 inch per hour in the morning led to snowfall totals ranging between 3 and 5 inches. Around 200 PM snow changed to freezing rain and began to rapidly accumulate near sunset. With around 0.75 inches glaze, power outages increased quickly after 800 PM, …
Flood Flood
Heavy rainfall and excessive run-off caused Wiley Brook to flood Route 105 in Hope south of High Street.
Winter Weather Winter Weather
Snow squalls arrived at the Midcoast during the late afternoon on the 17th. The Knox County Regional Airport reported visibility dropping to one quarter mile and winds gusting to 25 mph. The squalls lasted about 20 minutes at any given location before conditions improved. Snowfal…
High Wind High Wind
East of a deep low pressure in the eastern Great Lakes a strong low level jet developed. Deep, fresh snow cover across the interior prevented the strong winds from penetrating too far inland, but along the coast damaging wind gusts began very early in the morning on the 10th. The…
Winter Storm Winter Storm
Light to moderate snow began early in the morning on the 7th. Snow was occasionally heavy at times, but a heavy mesoscale snowband never quite made it north into the Midcoast. Snow ended quickly once surface winds veered to northwesterly. Snowfall totals ranged from 6 to 10 inche…
High Wind High Wind
Strong southeast wind gusts began the morning of the 18th. While wind gusts remained strong throughout the day, the damaging gusts occurred in several waves in the morning, again at midday, and once more in the evening. The Knox County Regional Airport recorded a peak gust of 52 …
Tropical Storm Tropical Storm
Minor impacts were reported for Post-Tropical Cyclone Lee. No inundation flooding was reported, but there was high surf on the Saturday midday high tide cycle as long period 10 to 11 foot swells reached the coast. This caused some minor splash-over and erosion in isolated areas. …
Flash Flood Flash Flood
Rounds of heavy rainfall resulted in flooding of small streams in Washington. The Little Medomack Brook washout out part of Calderwood Road and Davis Stream flooded Varner road.
Flood Flood
Widespread and numerous flooded roads across Knox County. Coastal flooding was concurrent with the heavy rainfall and increased the impacts. Roads that were flooded include Route 1 in Camden, Route 105 in Hope and Washington, Route 126 in Jefferson, and Route 131 near Campground …
Winter Storm Winter Storm
Rain changed to snow near Penobscot Bay around midday on the 14th. While snow struggled to accumulate at lower elevations during the first half of the day, as the sun angle got lower in the afternoon snowfall rates became moderate to heavy at times. Snowfall also remained more pe…
Winter Storm Winter Storm
Snow overspread the Midcoast early on the morning of the 4th. Snowfall quickly became moderate to heavy through the early afternoon hours. Snow quickly came to an end during the evening as low pressure moved into the northwest Atlantic and flow become more northwesterly, downslop…
Winter Storm Winter Storm
Light snow began after midnight on the 28th. Snow became moderate at times around sunrise and again during midday. Otherwise snow remained light and tapered off in the late evening, coming to an end from northwest to southeast. Snowfall totals ranged from 6 to 9 inches.
Extreme Cold/Wind Chill Extreme Cold/Wind Chill
By the late afternoon on the 3rd wind chills were reaching -30 degrees. Ambient air temperatures continued to fall into the double digits below zero with winds gusting in excess of 35 mph. The coldest wind chill values approached -45 degrees early on the 4th before winds graduall…
Flood Flood
Snow melt and rainfall amounts of 1.5-3 led to rapid run-off that swelled local streams and rivers to above bank full. Minor road flooding was reported in Knox County with up to 18 of water flowing of Barnestown Road near the intersections of Hosmer Pond Road in the hilly terrain…
Winter Storm Winter Storm
Snow began during the evening of the 22nd. Snowfall became moderate at times during the morning of the 23rd. The Midcoast remained just south of a mesoscale band of snow that was nearly stationary through the day. Snowfall had a high snow to liquid ratio, and fell at an inch per …
Winter Storm Winter Storm
Snow overspread Midcoast Maine late in the evening on the 19th. After midnight snow became moderate at times. Snowfall rates tapered off gradually through the as lift became tied more closely with an inverted trough draped over southern New Hampshire. Snow ended during the aftern…
High Wind High Wind
Parts of the Midcoast experienced two periods of strong to damaging winds. One during the morning hours of the 23rd generally had wind gusts in the 40 to 50 mph range. A second during the afternoon and evening featured wind gusts of 60 to 65 mph. Numerous trees and wires were rep…
Coastal Flood Coastal Flood
The morning of December 23rd had perfect alignment of a very high astronomical tide, peak storm surge of 2+ feet and large battering nearshore waves of 15 to 20 feet all coinciding at high tide. The astronomical tide in Portland was 11.3 feet MLLW at 10:16 am, already close to th…
Thunderstorm Wind Thunderstorm Wind
Large tree down on road that caused a car accident.
Thunderstorm Wind Thunderstorm Wind
A severe thunderstorm outflow winds downed trees and wires in Saint George, Maine.
Winter Storm Winter Storm
Snow overspread the Mid-coast region of Maine just after midnight on March 3rd. Snow started off light before a localized heavier snowband developed towards the early morning hours across interior Lincoln County and Knox Counties. Moderate to heavy snowfall fell in this band befo…
Winter Weather Winter Weather
Snow squalls crossed the Midcoast between 7:00 pm and 8:00 pm. The Knox County Regional Airport observed a visibility of 1/4 mile and a wind gust of 33 knots at 7:56 pm.
Winter Storm Winter Storm
Snow overspread the Midcoast early in the morning on the 25th. A hybrid type snow band pushed through the area then gradually transitioned into a laterally quasi-stationary band which slid back through the area around midday. Moderate to heavy snowfall resulted from the hybrid ba…
Blizzard Blizzard
Light snow began on the morning of the 29th, with the intensity of snowfall picking up after daybreak. An intense band of snow developed around mid morning over southern New England and remained mostly over the Gulf of Maine until midday. The band backed into coastal and Midcoast…
Events by year, as a table
| Year | Events | Tornadoes |
|---|---|---|
| 2026 | 6 | 0 |
| 2025 | 8 | 0 |
| 2024 | 14 | 0 |
| 2023 | 11 | 0 |
| 2022 | 8 | 0 |
| 2021 | 6 | 0 |
| 2020 | 12 | 0 |
| 2019 | 12 | 0 |
| 2018 | 6 | 0 |
| 2017 | 8 | 0 |
| 2016 | 8 | 0 |
| 2015 | 9 | 0 |
| 2014 | 4 | 0 |
| 2013 | 11 | 0 |
| 2012 | 7 | 0 |
| 2011 | 9 | 0 |
| 2010 | 10 | 0 |
| 2009 | 12 | 0 |
| 2008 | 7 | 0 |
| 2007 | 29 | 0 |
| 2006 | 20 | 0 |
| 2005 | 14 | 0 |
| 2004 | 11 | 0 |
| 2003 | 10 | 0 |
| 2002 | 16 | 0 |
| 2001 | 27 | 0 |
| 2000 | 26 | 0 |
| 1999 | 28 | 0 |
| 1998 | 19 | 0 |
| 1997 | 2 | 0 |
| 1996 | 19 | 0 |
| 1995 | 1 | 0 |
| 1992 | 2 | 0 |
| 1991 | 1 | 0 |
| 1987 | 1 | 0 |
| 1986 | 1 | 0 |
| 1969 | 1 | 1 |
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See every tornado that passed within 25 miles of a place in Knox County, measured to its path.
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