Northern Tornadoes Project 🇨🇦
@westernuntp.bsky.social
Founded in 2017 by Western University with ImpactWX, NTP aims to detect and document all tornadoes in Canada and uncover Canada’s true tornado climatology. See uwo.ca/ntp & cssl.ca.
The NTP has confirmed nine new Quebec tornadoes for 2025 based on our end-of-season satellite review, assisted by an AI detection algorithm. The damage in each case was only to trees, with one tornado rated EF2 and eight rated EF1.
Details: uwo.ca/ntp/blog/202...
#meteoQC
Details: uwo.ca/ntp/blog/202...
#meteoQC
October 27, 2025 at 3:33 PM
The NTP has confirmed nine new Quebec tornadoes for 2025 based on our end-of-season satellite review, assisted by an AI detection algorithm. The damage in each case was only to trees, with one tornado rated EF2 and eight rated EF1.
Details: uwo.ca/ntp/blog/202...
#meteoQC
Details: uwo.ca/ntp/blog/202...
#meteoQC
The NTP has confirmed a tornado over water (waterspout) that was reported off the coast of Nova Scotia near Rocky Bay on October 25.
Details at uwo.ca/ntp/blog/202....
#NSstorm
Details at uwo.ca/ntp/blog/202....
#NSstorm
October 27, 2025 at 2:48 PM
The NTP has confirmed a tornado over water (waterspout) that was reported off the coast of Nova Scotia near Rocky Bay on October 25.
Details at uwo.ca/ntp/blog/202....
#NSstorm
Details at uwo.ca/ntp/blog/202....
#NSstorm
The NTP has confirmed a new tornado over water (waterspout) that occurred over Lake Huron northwest of Bayfield, ON yesterday.
Details at the NTP blog here:
uwo.ca/ntp/blog/202...
#ONstorm
Details at the NTP blog here:
uwo.ca/ntp/blog/202...
#ONstorm
October 25, 2025 at 4:59 PM
The NTP has confirmed a new tornado over water (waterspout) that occurred over Lake Huron northwest of Bayfield, ON yesterday.
Details at the NTP blog here:
uwo.ca/ntp/blog/202...
#ONstorm
Details at the NTP blog here:
uwo.ca/ntp/blog/202...
#ONstorm
The NTP has confirmed five concurrent tornadoes over water (waterspouts) over Lake Erie off Long Point on Oct 21.
Details at the NTP blog here: uwo.ca/ntp/blog/202...
#ONstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202...
#ONstorm
October 23, 2025 at 4:30 PM
The NTP has confirmed five concurrent tornadoes over water (waterspouts) over Lake Erie off Long Point on Oct 21.
Details at the NTP blog here: uwo.ca/ntp/blog/202...
#ONstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202...
#ONstorm
Reposted by Northern Tornadoes Project 🇨🇦
The @nytimes.com highlighted work from #WesternU's Northern Tornadoes Project to reclassify a tornado that tore through rural North Dakota in June as an EF5, the highest category on the Enhanced Fujita Scale. @westernuntp.bsky.social
Deadly North Dakota Tornado Was a Rare EF5, Weather Service Says
Experts reassessed the damage from a tornado that left three people dead in June, and gave it the strongest possible rating on the tornado scale.
buff.ly
October 14, 2025 at 9:15 PM
The @nytimes.com highlighted work from #WesternU's Northern Tornadoes Project to reclassify a tornado that tore through rural North Dakota in June as an EF5, the highest category on the Enhanced Fujita Scale. @westernuntp.bsky.social
NTP partner 'The Weather Network' also has an article on the Enderlin, ND EF5 tornado that the NTP helped to rate. www.theweathernetwork.com/en/news/weat...
The U.S. sees its first EF-5 tornado in more than 4,400 days - The Weather Network
A violent, EF-5 tornado struck Enderlin, N.D., on June 20, 2025--the first instance of a twister given that designation in the U.S. since the Moore, Okla., event in May 2013.
www.theweathernetwork.com
October 7, 2025 at 2:15 PM
NTP partner 'The Weather Network' also has an article on the Enderlin, ND EF5 tornado that the NTP helped to rate. www.theweathernetwork.com/en/news/weat...
Good New York Times article on the upgrade to EF5 - mentioning that the Northern Tornadoes Project was called upon to assist. Gift article link so should be fully accessible.
www.nytimes.com/2025/10/06/w...
www.nytimes.com/2025/10/06/w...
October 7, 2025 at 1:12 PM
Good New York Times article on the upgrade to EF5 - mentioning that the Northern Tornadoes Project was called upon to assist. Gift article link so should be fully accessible.
www.nytimes.com/2025/10/06/w...
www.nytimes.com/2025/10/06/w...
The CSSL/NTP assisted the US National Weather Service (NWS) with their upgrading of the official rating of the June 2025 Enderlin, ND tornado from EF3 to EF5.
Announced by the NWS today, it’s the first EF5-rated tornado in the US since 2013.
Details here: uwo.ca/ntp/blog/202...
Image B. Emfinger
Announced by the NWS today, it’s the first EF5-rated tornado in the US since 2013.
Details here: uwo.ca/ntp/blog/202...
Image B. Emfinger
October 6, 2025 at 6:16 PM
The CSSL/NTP assisted the US National Weather Service (NWS) with their upgrading of the official rating of the June 2025 Enderlin, ND tornado from EF3 to EF5.
Announced by the NWS today, it’s the first EF5-rated tornado in the US since 2013.
Details here: uwo.ca/ntp/blog/202...
Image B. Emfinger
Announced by the NWS today, it’s the first EF5-rated tornado in the US since 2013.
Details here: uwo.ca/ntp/blog/202...
Image B. Emfinger
Reposted by Northern Tornadoes Project 🇨🇦
Excited to announce that my method for estimating wind speeds based on lofted debris in tornadoes was used as contextual evidence for upgrading the Enderlin, ND tornado to an EF5!
doi.org/10.1175/MWR-...
#NDwx #Enderlin #EF5 #Tornado
doi.org/10.1175/MWR-...
#NDwx #Enderlin #EF5 #Tornado
October 6, 2025 at 3:38 PM
Excited to announce that my method for estimating wind speeds based on lofted debris in tornadoes was used as contextual evidence for upgrading the Enderlin, ND tornado to an EF5!
doi.org/10.1175/MWR-...
#NDwx #Enderlin #EF5 #Tornado
doi.org/10.1175/MWR-...
#NDwx #Enderlin #EF5 #Tornado
The first forested area to be searched with NTP's new AI tool - Northern Ontario east of Lake Superior - turned up five tornadoes, including one rated EF2. These were all manually verified and documented.
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Lots more to come...
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Lots more to come...
October 3, 2025 at 4:19 PM
The first forested area to be searched with NTP's new AI tool - Northern Ontario east of Lake Superior - turned up five tornadoes, including one rated EF2. These were all manually verified and documented.
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Lots more to come...
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Lots more to come...
Today we have a special blog post on a new NTP tool for AI-assisted satellite review, with the method described by its developer - the NTP's Daniel Butt. The tool is being used experimentally and is already producing results. More on that shortly!
uwo.ca/ntp/blog/202...
uwo.ca/ntp/blog/202...
October 3, 2025 at 3:00 PM
Today we have a special blog post on a new NTP tool for AI-assisted satellite review, with the method described by its developer - the NTP's Daniel Butt. The tool is being used experimentally and is already producing results. More on that shortly!
uwo.ca/ntp/blog/202...
uwo.ca/ntp/blog/202...
Following a thorough satellite review for storm tracks of interest, the NTP has confirmed three new EF1 tornadoes from earlier in the season in Quebec.
The first two occurred on April 29 and the third on June 23.
Details at:
uwo.ca/ntp/blog/202...
#meteoQC
The first two occurred on April 29 and the third on June 23.
Details at:
uwo.ca/ntp/blog/202...
#meteoQC
October 2, 2025 at 3:39 PM
Following a thorough satellite review for storm tracks of interest, the NTP has confirmed three new EF1 tornadoes from earlier in the season in Quebec.
The first two occurred on April 29 and the third on June 23.
Details at:
uwo.ca/ntp/blog/202...
#meteoQC
The first two occurred on April 29 and the third on June 23.
Details at:
uwo.ca/ntp/blog/202...
#meteoQC
The NTP has confirmed three new tornadoes and upgraded a downburst damage rating in Northern Ontario.
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
October 2, 2025 at 1:05 PM
The NTP has confirmed three new tornadoes and upgraded a downburst damage rating in Northern Ontario.
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
Details here:
uwo.ca/ntp/blog/202...
#ONstorm
The NTP has confirmed four EF2 tornadoes in western Quebec during the late afternoon and evening hours of September 5. In each case there was considerable tree damage.
Full details can be found here:
uwo.ca/ntp/blog/202...
#meteoQC
Full details can be found here:
uwo.ca/ntp/blog/202...
#meteoQC
September 30, 2025 at 7:18 PM
The NTP has confirmed four EF2 tornadoes in western Quebec during the late afternoon and evening hours of September 5. In each case there was considerable tree damage.
Full details can be found here:
uwo.ca/ntp/blog/202...
#meteoQC
Full details can be found here:
uwo.ca/ntp/blog/202...
#meteoQC
Reposted by Northern Tornadoes Project 🇨🇦
New paper alert!
"Multi-Level In-Situ Measurements During a Direct Hit by a Significant Tornado" in A-O.
Observations from a 2010 F2 tornado at a Harrow, ON-area wind farm show that peak winds do increase closer to the ground, supporting DOW radar measurements/analysis.
doi.org/10.1080/0705...
"Multi-Level In-Situ Measurements During a Direct Hit by a Significant Tornado" in A-O.
Observations from a 2010 F2 tornado at a Harrow, ON-area wind farm show that peak winds do increase closer to the ground, supporting DOW radar measurements/analysis.
doi.org/10.1080/0705...
Multi-Level In-Situ Measurements During a Direct Hit by a Significant Tornado
A rare direct hit by a significant tornado on a weather station is documented, with a peak 1-s wind gust of 53.1 m/s (191.2 km/h) and a surface pressure deficit of 16.0 hPa recorded. Even more unco...
doi.org
September 16, 2025 at 2:36 PM
New paper alert!
"Multi-Level In-Situ Measurements During a Direct Hit by a Significant Tornado" in A-O.
Observations from a 2010 F2 tornado at a Harrow, ON-area wind farm show that peak winds do increase closer to the ground, supporting DOW radar measurements/analysis.
doi.org/10.1080/0705...
"Multi-Level In-Situ Measurements During a Direct Hit by a Significant Tornado" in A-O.
Observations from a 2010 F2 tornado at a Harrow, ON-area wind farm show that peak winds do increase closer to the ground, supporting DOW radar measurements/analysis.
doi.org/10.1080/0705...
Reposted by Northern Tornadoes Project 🇨🇦
With the 10 tornadoes added today from past months, the 2025 national tornado count goes to 66. Which is tied for 2017 at this point in the season for the *least* number of tornadoes since NTP began in 2017. And is almost half of what Canada experienced last year.
Will be looking into the why...
Will be looking into the why...
September 8, 2025 at 5:31 PM
With the 10 tornadoes added today from past months, the 2025 national tornado count goes to 66. Which is tied for 2017 at this point in the season for the *least* number of tornadoes since NTP began in 2017. And is almost half of what Canada experienced last year.
Will be looking into the why...
Will be looking into the why...
An additional 4 tornadoes have been confirmed by NTP for Quebec from June based on satellite imagery review. There was 1 EF2 tornado and 3 EF1 tornadoes.
Details at the NTP blog here: uwo.ca/ntp/blog/202.... Tornadoes are plotted on a regional map below.
#meteoQC #QCstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202.... Tornadoes are plotted on a regional map below.
#meteoQC #QCstorm
September 8, 2025 at 5:07 PM
An additional 4 tornadoes have been confirmed by NTP for Quebec from June based on satellite imagery review. There was 1 EF2 tornado and 3 EF1 tornadoes.
Details at the NTP blog here: uwo.ca/ntp/blog/202.... Tornadoes are plotted on a regional map below.
#meteoQC #QCstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202.... Tornadoes are plotted on a regional map below.
#meteoQC #QCstorm
The NTP has confirmed an additional 6 tornadoes for the Prairie provinces based on witness reports - 2 in AB, 3 in SK and 1 in MB. An EF0-Default rating is assigned for each since no damage was reported or detected.
See the NTP blog for details: uwo.ca/ntp/blog/202...
#ABstorm #SKstorm #MBstorm
See the NTP blog for details: uwo.ca/ntp/blog/202...
#ABstorm #SKstorm #MBstorm
September 8, 2025 at 5:03 PM
The NTP has confirmed an additional 6 tornadoes for the Prairie provinces based on witness reports - 2 in AB, 3 in SK and 1 in MB. An EF0-Default rating is assigned for each since no damage was reported or detected.
See the NTP blog for details: uwo.ca/ntp/blog/202...
#ABstorm #SKstorm #MBstorm
See the NTP blog for details: uwo.ca/ntp/blog/202...
#ABstorm #SKstorm #MBstorm
The NTP has confirmed three tornadoes over Lake Erie from the evening of August 28.
See here for details: uwo.ca/ntp/blog/202...
#ONstorm
See here for details: uwo.ca/ntp/blog/202...
#ONstorm
September 2, 2025 at 4:37 PM
The NTP has confirmed three tornadoes over Lake Erie from the evening of August 28.
See here for details: uwo.ca/ntp/blog/202...
#ONstorm
See here for details: uwo.ca/ntp/blog/202...
#ONstorm
The NTP has confirmed three new tornadoes in southern AB from June, all rated EF0-Default.
Details at uwo.ca/ntp/blog/202....
#ABstorm
Details at uwo.ca/ntp/blog/202....
#ABstorm
August 30, 2025 at 2:41 PM
The NTP has confirmed three new tornadoes in southern AB from June, all rated EF0-Default.
Details at uwo.ca/ntp/blog/202....
#ABstorm
Details at uwo.ca/ntp/blog/202....
#ABstorm
The NTP has confirmed that a downburst (paired with large hail) caused high-end EF1 damage in the Brooks, AB area on August 20.
Details at the NTP blog here: uwo.ca/ntp/blog/202...
Note that ongoing analysis may result in additional events and/or a rating upgrade.
#ABstorm #SKstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202...
Note that ongoing analysis may result in additional events and/or a rating upgrade.
#ABstorm #SKstorm
August 28, 2025 at 4:14 PM
The NTP has confirmed that a downburst (paired with large hail) caused high-end EF1 damage in the Brooks, AB area on August 20.
Details at the NTP blog here: uwo.ca/ntp/blog/202...
Note that ongoing analysis may result in additional events and/or a rating upgrade.
#ABstorm #SKstorm
Details at the NTP blog here: uwo.ca/ntp/blog/202...
Note that ongoing analysis may result in additional events and/or a rating upgrade.
#ABstorm #SKstorm
The NTP has confirmed two EF1 downbursts (one being a microburst), an EF0 tornado and a gustnado from the SK storms of Aug 20 near Saskatoon.
The assessments are based on witness reports, an NTP damage survey, and radar/satellite imagery analysis.
Details here: uwo.ca/ntp/blog/202...
#SKstorm
The assessments are based on witness reports, an NTP damage survey, and radar/satellite imagery analysis.
Details here: uwo.ca/ntp/blog/202...
#SKstorm
August 28, 2025 at 4:07 PM
The NTP has confirmed two EF1 downbursts (one being a microburst), an EF0 tornado and a gustnado from the SK storms of Aug 20 near Saskatoon.
The assessments are based on witness reports, an NTP damage survey, and radar/satellite imagery analysis.
Details here: uwo.ca/ntp/blog/202...
#SKstorm
The assessments are based on witness reports, an NTP damage survey, and radar/satellite imagery analysis.
Details here: uwo.ca/ntp/blog/202...
#SKstorm
The NTP has confirmed four additional tornadoes over water (waterspouts) that occurred in the Canadian waters of the Great Lakes in August.
See the following for details:
uwo.ca/ntp/blog/202...
#ONstorm
See the following for details:
uwo.ca/ntp/blog/202...
#ONstorm
August 26, 2025 at 2:59 AM
The NTP has confirmed four additional tornadoes over water (waterspouts) that occurred in the Canadian waters of the Great Lakes in August.
See the following for details:
uwo.ca/ntp/blog/202...
#ONstorm
See the following for details:
uwo.ca/ntp/blog/202...
#ONstorm
The NTP has confirmed three EF2 tornadoes that occurred in NE Ontario near Englehart on July 12.
Satellite imagery was used to identify the tracks of significant tree damage.
Details at uwo.ca/ntp/blog/202...
#ONstorm
Satellite imagery was used to identify the tracks of significant tree damage.
Details at uwo.ca/ntp/blog/202...
#ONstorm
August 26, 2025 at 12:57 AM
The NTP has confirmed three EF2 tornadoes that occurred in NE Ontario near Englehart on July 12.
Satellite imagery was used to identify the tracks of significant tree damage.
Details at uwo.ca/ntp/blog/202...
#ONstorm
Satellite imagery was used to identify the tracks of significant tree damage.
Details at uwo.ca/ntp/blog/202...
#ONstorm
Reposted by Northern Tornadoes Project 🇨🇦
UPDATE: Two NTP teams will investigate wind damage, one in SE AB and one in central SK. The NHP will also have a team investigating hail damage in the Cassils / Brooks, AB area.
Please send significant damage reports to @ntp-reports.bsky.social and @nhp-reports.bsky.social. #ABstorm #SKstorm
Please send significant damage reports to @ntp-reports.bsky.social and @nhp-reports.bsky.social. #ABstorm #SKstorm
There are numerous reports of significant wind damage in southeastern Alberta from intense storms earlier today. Hail damage has also been reported.
An NTP survey team will leave tomorrow for the area to thoroughly assess the damage.
Please send damage reports to @ntp-reports.bsky.social. #ABstorm
An NTP survey team will leave tomorrow for the area to thoroughly assess the damage.
Please send damage reports to @ntp-reports.bsky.social. #ABstorm
August 21, 2025 at 7:45 PM
UPDATE: Two NTP teams will investigate wind damage, one in SE AB and one in central SK. The NHP will also have a team investigating hail damage in the Cassils / Brooks, AB area.
Please send significant damage reports to @ntp-reports.bsky.social and @nhp-reports.bsky.social. #ABstorm #SKstorm
Please send significant damage reports to @ntp-reports.bsky.social and @nhp-reports.bsky.social. #ABstorm #SKstorm