8AM EDT (12Z) Synoptic “Snapshot” summary of
current atmospheric conditions in S. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for the day till Midnight
& any active ECCC Alerts at post: Frost Alerts will expire
#onwx #onstorm

8AM EDT (12Z) Synoptic “Snapshot” summary of
current atmospheric conditions in N. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for the day till Midnight
& any active ECCC Alerts at post: None
#onwx #onstorm

Latest regional radar loop for Ontario, zoomed in 4 SONT. Cold front is very evident on this loop, keeps moving East-NE, scattered showers/odd rumble of thunder, no big deal, it's weakening tho. This is the 1st wave of cooler air pushing thru -Next wave Mon. AM #onwx #onstorm

...while I brew my coffee🙌...Quick look at RTMA Temperature Analysis (of real data) this morning at 6:15 AM. Coldest air in mid areas of EONT. Probably some patch frost, especially in frost pockets. #onwx #onstorm (Mmmmmmm...the smell of coffee on a Sunday Morn😋)

That cold front will usher cooler at first, showers. maybe a local storm, but the arrival of the colder air aloft happens Mon. AM. Lot's of instability sets up post front (warm lakes) both Integrated graupel which helps Lightning production + lake CAPE ramps ups. #onwx #onstorm

Latest 0Z HRRR- Radar + Cloud cover% 4cast from ~now thru 8PM Mon. Cold front crosses SONT ~mid-day Sun. (few showers/risk local storm) cooler air floods in at first,-then even colder air Mon. AM. Instability showers/LE streamers pop up. HRRR also thinking some⚡️ with the front #onwx #onstorm

8PM EDT (00Z) Synoptic “Snapshot” summary of
current atmospheric conditions in S. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for overnight till 8AM next day & any active ECCC Alerts at post:
shorturl.at/Mfiuo - frost
#onwx #onstorm

8PM EDT (00Z) Synoptic “Snapshot” summary of
current atmospheric conditions in N. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for overnight till 8AM next day & any active ECCC Alerts at post: None
#onwx #onstorm

....Well that ramped up faster than I thought, lol
Frost alert just released... don't worry, there will be more in the next couple of days😬. 👉 shorturl.at/FPWYK
#onwx #onstorm

We have a Frost advisory issued for Eastern Ontario for Sunday October 4th.. #frost #onstorm #ONwx

Still on track for frost risk-Shot of colder air late Sunday thru Tues AM. for Ontario-But short lived. (blue=below 0C, Black= at 0C, warm colours=above 0C,-all at 850mb)-added mid-level (500mb) contours for air flow + Surface 4cast Temp. Maps for Mon. & Tues. AM (attached to post) #onwx #onstorm

Latest hourly run of HRRR-Radar + Cloud 4cast (>50% and up) from Now till 1AM Sun. Most of that energy with this system will be focused in NONT, -only risk of a few showers on SUN. for some regions of SONT (mainly SC/EONT) #onwx #onstorm

Latest hourly run of the HRRR -Radar+Cloud cover % (>50% & up) from ~now till 1PM Sat. Next weather system will likely move from ~west to east across NWONT thru NEONT over the weekend, bulk of the weather (showers) will remain there-slight chance of showers in SONT #onwx #onstorm

8PM EDT (00Z) Synoptic “Snapshot” summary of
current atmospheric conditions in S. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for overnight till 8AM next day & any active ECCC Alerts at post: None
#onwx #onstorm

8PM EDT (00Z) Synoptic “Snapshot” summary of
current atmospheric conditions in N. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for overnight till 8AM next day & any active ECCC Alerts at post: None
#onwx #onstorm

ONT Summer 2026 Review-Overall-temperatures were higher than normal across the province. Summer rainfall exhibited 3 distinct regional zones: below-normal-across much of NW Ontario & the Far North, near-normal in NEONT & above-normal across SONT #onwx #onstorm (source ECCC/MSC)

Sept. 2026 Monthly review by ECCC/MSC- “Quick Overview” - Mean overall temperatures were warmer than normal across the province, while rainfall amounts below-normal precipitation across nearly the entire province. Attached Chars,Table summary & Sig. Weather review. #onwx #onstorm

Latest hourly run of the HRRR - Radar + Cloud cover % (>50% & up) from ~now till 1AM Sat. Cold front moves, taking the rain cloud out, -cooler air begins to flood in Sat. We needed the rain tho. #onwx #onstorm

8AM EDT (12Z) Synoptic “Snapshot” summary of
current atmospheric conditions in S. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for the day till Midnight
& any active ECCC Alerts at post: None
#onwx #onstorm

8AM EDT (12Z) Synoptic “Snapshot” summary of
current atmospheric conditions in N. Ontario
Such as-pressure/temp.-fields/frontal locations.
A total precipitation outlook for the day till Midnight
& any active ECCC Alerts at post: None
#onwx #onstorm