Ron

Latest hourly run of the HRRR model -Radar 4cast from now till 2 PM Thurs. Strong cold front should cross SONT overnight, and the LESnows should be in full swing in the snow belts. #onwx #onstorm

Latest Regional Radar loop/trend + LTNG⚡️
6hr. history -till 10:02 PM EST. #onwx #onstorm

KISS method -"Keep It Super Simple"-Latest WPC Snow guidance (in inches)-their thinking for the next 48 hrs. (7pm Wed-7pm Fri.(the underlay image) Current HRRR Radar 4cast for the same period. Cold air moves in, LESnows fire off-then a Clipper moves thru ~Fri-Sat #onwx #onstorm

...the "trending" fashion -the next few days in Ontario.
#onwx #onstorm 🥶

Latest hourly run of the HRRR - Radar 4cast + SFC Visibility less than 5 miles (grey blobs). from now till 11 PM EST. "Real" cold front moves across NEONT into SONT (late evening) Still vibe-ing -"winter squall line characteristics" as it sinks SE-ward. #onwx #onstorm 👋🏎️ L8ter

Latest Regional Radar loop/trend + SFC Visibility less than 5 miles (grey blobs), 6hr. history,-till 7:02 AM EST. #onwx #onstorm

6am EST (11Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm (early morning appointments🙄😒have to do this earlier) Current active ECCC alerts 👉 shorturl.at/o3Wch Have a good safe day! later 👋

6am EST (11Z) Synoptic "Snapshot" of the weather for N. Ontario. #onwx #onstorm (early morning appointments🙄😒 have to do this earlier) Current active ECCC alerts👉 shorturl.at/o3Wch
Have a good safe day!👋 later

...Savage...Look at the lakes respond to some of the coldest air this season,-penetrate deep into ONT (even L. Nipigon). Latest 0Z HRRR-Radar 4cast. (winter mode) Now! -that's what I call a cold front! And,-right behind this cold outbreak-a Clipper ready to move in #onwx #onstorm

7pm EST (00Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm Cold night on tap, but it will get colder late tomorrow, with a very sharp cold front, and possibly active "Winter-line-squall-ish type vibe"-turning windy and cold!

7pm EST (00Z) Synoptic "Snapshot" of the weather for N. Ontario. #onwx #onstorm, just some light patchy snow/or flurries as a strong cold front works it way across NWONT into NEONT. Cold night on tap for NWONT, with Wind Chills in the low ~ -20C, wind will pick up overnight

I think the UK Met office does a good job of describing the polar vortex. Even tho we are in North America, the principles are virtually the same. The jet stream and it's ever-changing pattern affect all across the Northern hemisphere. #onwx #onstorm (Credit: UK Met office)

PV snapshot (Dec. 8th) + cross/section for YYZ + 4casted temps.

Look's like a PV (Polar Vortex) lobe(s) will swing SE-ward into N. regions of ONT-I just picked the day of max extent/coverage (~Dec. 8th) for the far north-but the loop shows the "lead in" & "Exit". Added (attached to the post) cross/section for YYZ + 4casted temps for that period. #onwx #onstorm

Nov. 2025 Monthly Summary-mean monthly temperature: Above normal over NWONT/Far North & near normal/slightly cooler in SONT. Precipitation amounts: Near normal overall-slightly drier in NWONT/parts of SONT.
+Stats table +Sig. Wx. Events summary
(Source MSC/ECCC) #onwx #onstorm

Looking to the West of Ontario...Snapshot at 12Z (7am EST) Temps, fronts and weather systems. #onwx #onstorm

Latest NAM12K for the rest of the week, turning much colder, -cold fronts-Clippers-LESnows-unsettled/cold.
Plotted: 850mb temps, mid-level HGTS/flow, and radar echo's...winter mode. #onwx #onstorm

Latest hourly run of the HRRR model-Radar 4cast (P-type) from ~now till 1AM Wed. Bulk of the snow remains south of the L. Lakes, LESqualls in the N. weaken, but another shot of colder air arriving Wed-Thurs. may re-invigorate them again. Much Colder air is on it's way. #onwx #onstorm

Latest Regional Radar loop/trend, 6hr. history,-till 8:26 AM EST. #onwx #onstorm the bulk of the snow is just south of the lower Lakes. That LESquall off G. Bay has been going strong all night (impacting areas from ~Britt to Parry Sound)

7am EST (12Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm Periods of light snow/flurries thru-out the day. Current ECCC alerts👉: shorturl.at/uVlWx

7am EST (12Z) Synoptic "Snapshot" of the weather for N. Ontario. #onwx #onstorm Scattered snow thru-out the north and cold, colder in the far north. Current ECCC alerts👉: shorturl.at/uVlWx

Latest WPC Winter Snow Guidance (in inches) just an overall overview for most of SONT same thinking as other models. Just used the 50th percentile-"what is expected" Colour Scale on top in inches, 1" snow=~2.5cm . #onwx #onstorm 24hr. 4cast-from 7PM tonight till 7PM Tues.

Latest hourly run of the HRRR model-Radar 4cast+ Total Snowfall (in inches) from ~now till 1PM Tues. According to the colour snow scale on the top, the light grey & light blue=~1 to 2"inches along the N. shorelines, maybe a bit more with possible lake enhancement. #onwx #onstorm

7pm EST (00Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm Current ECCC alerts can be found here: shorturl.at/QklbH

7pm EST (00Z) Synoptic "Snapshot" of the weather for N. Ontario. #onwx #onstorm Current ECCC alerts can be found here: shorturl.at/QklbH

Just a quick look at Toronto Island's temperature trend rest of the week-Cross-Section-Profile-Approach. Sharp cold front crosses ~mid-weak & introduces a much colder brand of air.- Don't think it will get that cold-but a colder trend 4 sure *CN Tower not 2 scale😅#onwx #onstorm

NBM snow numbers (in cm) out till 1AM Wed.

A glancing blow of snow for SONT, Low passing south of the lower Lakes will bring some light snow for most of SONT. The snow numbers (in cm) look good from the Latest NBM (attached). It's G. Bay's turn now for some LESnows. Both Loop/NBM data same time span-out till 1 AM Wed. #onwx #onstorm

7am EST (12Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm LESnows are beginning to weaken in SWONT -but may develop further across G. Bay region. The Syno map has that "back door cold front" vibe this AM. Current ECCC alerts: shorturl.at/5Afb5

7am EST (12Z) Synoptic "Snapshot" of the weather for N. Ontario. #onwx #onstorm Cold AM in the North, Parts of NONT are dealing with some LESnows off. L. Superior. See latest ECCC Alert here: shorturl.at/cFVVj