Dave Sills 🍁🌪️🎶⚓☮️

@davesills.ca

Canadian tornado guru at uwo.ca/ntp and the new CSSL.ca at WesternU in Londontario, my debut album is 'Fifty' (bit.ly/40WqxUy) and my latest album is 'Cover Me' (bit.ly/3V1MnCG), Great Lakes sailor, ECCC & YorkU alumnus, #ElbowsUp

I contributed to this Globe and Mail story on missing 12 UTC weather balloons in the western half of the US each morning. Canada needs to be more self-sufficient - we rely on US balloon and radar data near the border, and completely for satellite imagery. www.theglobeandmail.com/gift/1fa5cdb...

Whither the weather balloons? U.S. changes leave Canada with less notice of storms, experts say

American stations have strayed from regular launch times observed around the globe as part of co-ordinated scientific effort

theglobeandmail.com

In Toronto this morning (Thursday) the sky looks slightly less hazy, but the surface pollution levels are actually twice as bad as yesterday. And the worst I can remember in 20 years of living here. If you have to breathe outside, wear a mask! 😷

Graph of air quality data over Toronto showing recent spike in PM2.5 levels to nearly 300 micrograms per cubic meter

An interesting case study yesterday - smoke pouring in from the fires in NW ON changed the potentially disastrous outcome in QC. Storms did form but their intensity was severely dampened by the smoke, limiting instability and increasing the strength of the cap. Many remained elevated. 1/2

Dave Sills 🍁🌪️🎶⚓☮️@davesills.ca · 3w ago

I hope Quebec is ready for what is coming at them tomorrow weather-wise. There is agreement among models/runs that supercell thunderstorms are likely over a large area along the St. Lawrence Valley. This HRRR sounding suggests an extreme environment capable of generating violent tornadoes. #meteoQC

Trains surrounded by flames near Armstrong in NW Ontario. Thankfully these locomotives are built like tanks. I'm told that all involved made it out. One train was abandoned, others left their load behind to get away and then still had to continue on foot for a bit. www.tiktok.com/@solmamakwa/...

What we are witnessing right now in northern Ontario is devastating. This is near Armstrong, Ontario. When will the Canadian National Railway Company make a statement about this incident?

TikTok video by Sol Mamakwa

tiktok.com

This morning's outlook from CPIQ increases the 'high' area size and adds a tornado icon to the 'moderate' area. All good. But if this environment is not 'extreme', I'm not sure what is. The one fly in the ointment is the amount of smoke drifting over the area - that could reduce severity. #meteoQC

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Dave Sills 🍁🌪️🎶⚓☮️@davesills.ca · 3w ago

The thunderstorm outlook for tomorrow issued by the ECCC weather office in Montreal does show a 'high' risk centred on Trois-Rivières with a tornado icon associated, but no tornado icon for other areas along the St. Lawrence Valley. I'm concerned that underplays the risk. Guess we'll see... #meteoQC

I hope Quebec is ready for what is coming at them tomorrow weather-wise. There is agreement among models/runs that supercell thunderstorms are likely over a large area along the St. Lawrence Valley. This HRRR sounding suggests an extreme environment capable of generating violent tornadoes. #meteoQC

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ECCC has issued a yellow-level Tornado Watch for central Saskatchewan (light yellow polygon). A severe thunderstorm warning is already in place for the Unity area. Monitor ECCC alerts and be prepared if in this area. Hoping we don't have a repeat of yesterday's tornado outbreak here! #SKstorm

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Really intense supercell with strong rotation heading southeast toward Waldheim, SK, north of Saskatoon. Tornado warned, and chasers have reported tornadoes with the storms in this area. Very large hail also possible. Take shelter immediately if in the path of this storm. #SKstorm

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Supercell thunderstorm rotation about 10-20 minutes before it produced a tornado west of Glencoe, ON earlier today. Rain and some large hail wrapping around the back near end of video. Shown at 2x speed to achieve the level of impressiveness I experienced in real time (IMHO). #ONstorm

Had an intense storm chase today as a supercell thunderstorm moved SE across SW Ontario. Strong low-level rotation, then a tornado developed west of Glencoe. Some large hail, too. Did a preliminary damage survey then caught a double rainbow and mammatus on the way home. Full package! #ONstorm 1/2

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