It's Emergency Preparedness Week, and your help is needed on a related letter-writing campaign. ECCC has decided to shut down its long-standing radar research program. This affects severe weather warnings, and the work of the NTP and its partners. Details here: actionnetwork.org/letters/reve...

New (open-access) paper! This full-scale wind tunnel study investigates the wind loading of architectural rooftop screens and their influence on the wind loads experienced by roof-mounted equipment (RME). Check it out here: doi.org/10.1080/2374...

I'm excited to share that my latest paper focused on the internship program at @cssl.ca is now available as an early online release in the Bulletin of the American Meteorological Society! doi.org/10.1175/BAMS...

Big update 🚀 We’ve launched the Pro Version of the Canadian Mesonet Portal, along with major improvements across all versions of the platform! Pro Version features will continue rolling out gradually throughout the month, so keep an eye out! Details: www.uwo.ca/nmp/news/202...

Sorry if you saw any weird tweets from me. Account somehow got hacked!

We are currently implementing a large update to the Canadian Mesonet Portal (meso.cssl.ca), which will result in data being temporarily unavailable for the next 24 hours. Please be patient with us as we work to make the site even better!

The Northern Mesonet Project at the Canadian Severe Storms Laboratory (@cssl.ca) is looking for a Research Software Engineer to join our team! Please feel free to share with anyone who may be interested! You can find the details of the position (ID# 41923) here: www.uwo.ca/hr/working/s...

Some unexpected lightning and hail today in NE London! #onstorm #onwx

Fifth-year #WesternU student Sophia Slabon made a course correction that led her to global learning, community collaboration, fieldwork in geographical sciences and publishing research as an undergrad. 🌍 Read how she's working to future-proof the planet. ⬇️ #AllinWesternU

🌪️A Radar technique has been applied to study tornado tracks in forested areas for the 1st time by @westernu.ca ES prof @planetneish.bsky.social + co-authors Sophia Slabon + Connell Miller at the Canadian Severe Storms Lab. 🔗https://www.tandfonline.com/doi/full/10.1080/07038992.2025.2579315#abstract

A small update from @meso.cssl.ca: we have updated our watches / warnings displayer to match the new colour-coded weather alert system used by Environment Canada. You can find more information on the new system here: www.canada.ca/en/services/...

Dive into real-world research and fieldwork with the CSSL Summer Internship Program! Learn more and apply here: uwo.ca/cssl/interns... Don't miss your chance to gain hands-on experience with leading tornado and hail experts in the field. Applications close on January 26th.

I'm happy to share two @cssl.ca open-access remote sensing papers that are both related to alternative methods of classifying tornado damage! 🧵:

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. #NDwx www.theweathernetwork.com/en/news/weat...

Amazing work by Ontario's own Dr. Connell Miller of NTP!

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

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

I've created a Bluesky Starter Pack called 'Canadian Severe Storms Community'. Makes it easy to find and follow severe storm forecasters, researchers, chasers and enthusiasts in Canada! go.bsky.app/9eQf9Zd Please let me know if you'd like to be added or if you think someone else needs to be added.

New (open-access) paper from myself and @davesills.ca! This was a rare opportunity to examine data from a meteorological tower directly hit by a tornado. Results support mobile radar-based theory that tornado winds intensify near the ground, where most damage occurs. doi.org/10.1080/0705...

Crazy winds caught by @meso.cssl.ca from the storms on August 20th in AB/SK. Maximum wind speed of nearly 150 km/h recorded in Atlee, AB. Hail track from the MESH product also showed intense hail (~75 mm) #abstorm #abwx #skstorm #skwx

Some serious hail being reported from the Northern Mesonet Project hail stations in Calgary. Up to 40-45mm hail in NW Calgary, with multiple stations recording 100s of hail impacts within a 10 minute period. #abstorm #abwx Source: @meso.cssl.ca / @westernunmp.bsky.social

Reinforcing wall-to-roof connections, @connellmiller.ca said, would allow homes to withstand 95 per cent of tornadoes that occur in Canada. While potent winds can threaten homes, heavy rain and wildfires account for the bulk of #ClimateChange-related damage. www.theweathernetwork.com/en/news/clim...

Video of tornado crossing Hwy 4 SE of Lucan, ON #ONstorm. Not for broadcast except TWN or other permission.

A new update is now live on @meso.cssl.ca! This update allows for viewing historical weather station data both on the map and in graphs. Currently we have up to January 1, 2025 available, but aim to make more historical data available soon! You can see more details here: www.uwo.ca/nmp/news/202...

Had the chance to chat with CTV News about the downburst in Samuel de Champlain Provincial Park on June 21! #onwx #onstorm www.youtube.com/watch?v=8GaO...

It's a scorcher in Southwestern Ontario today! Current peak temperature is in east Toronto at 37.2°C! #onwx Source: @meso.cssl.ca

Some incredible rainfall rates recorded last night in Central-Eastern Ontario. #ONwx #ONStorm Source: @meso.cssl.ca

129.2 km/h wind gust reported at Edmonton Airport on the @meso.cssl.ca ! #abwx #abstorm

Another big update is now live on @meso.cssl.ca! This includes hail impact reports, maximum estimated size of hail (MESH) layers, present weather reports, and other minor updates to our display options. You can learn more about this update here: www.uwo.ca/nmp/news/202...

Big crowd for this month’s CSSL Seminar now that all of the interns have started (there are even more online). Speaking today is Dr. Connell Miller, Director of CSSL’s Northern Mesonet Project (@westernunmp.bsky.social), on experimental tornado wind estimation methods. @westernuresearch.bsky.social

Incredibly strong wind gust of 102 km/h reported in Chatham, ON last night at 2AM! Check out meso.cssl.ca to see the data!

A very big update is now live on the Canadian Mesonet Portal! This includes new meteorological variables, saving / exporting settings and more! For more details, you can check out the link below. But here are the main highlights for you to see in a 🧵: www.uwo.ca/nmp/news/202...

Right before the start of the new year, my family got a little bit bigger! Everyone is happy and healthy! (And tired)

The Canadian Mesonet Portal (meso.cssl.ca) now has 167 new stations from the Alberta Government’s Ministry of Agriculture and Irrigation! #CANwx #SkyWX #WXsky #Weather #Canada

Dive into real-world research and fieldwork with the CSSL Summer Internship Program! Learn more and apply here: uwo.ca/cssl/internships/index.html Don't miss your chance to gain hands-on experience with leading hail and tornado experts in the field. Applications close on January 27th.

Did you know that the Canadian Mesonet Portal (meso.cssl.ca) offers advanced graphing tools that allow you to dig into the data? You can select the variable you want to visualize, create multiple graphs, adjust the graph size, hover over data points, and click/drag to create a custom time frame!

Nice to see them over here.. Get real-time observations from across Canada using the Canadian #Mesonet Portal and be sure to follow them here 👇🏻 #CANwx #SkyWX #WXsky #Weather #Canada

Hello Bluesky! We’re thrilled to be here! If you missed our launch in late October and haven’t visited the Canadian Mesonet Portal yet, you can find it here! meso.cssl.ca