YELLOW ADVISORY - FROST, Peterborough

Persons in or near this area should be on the lookout for adverse weather conditions and take necessary safety precautions. Issued: 10:40 AM EDT Saturday 3 October 2026...

#Frost #ONwx #CdnWeather #wx

YELLOW ADVISORY - FROST, Kingston

Persons in or near this area should be on the lookout for adverse weather conditions and take necessary safety precautions. Issued: 10:40 AM EDT Saturday 3 October 2026...

#Frost #ONwx #CdnWeather #wx

YELLOW ADVISORY - FROST, Ottawa

Persons in or near this area should be on the lookout for adverse weather conditions and take necessary safety precautions. Issued: 10:40 AM EDT Saturday 3 October 2026...

#Frost #ONwx #CdnWeather #wx

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

Quick look at the current radar loop from the overnight till 6:37 AM EDT-rain continues to move ENE thru SONT. Back edge showing up in N & W of SWONT. A quick look at Radar Estimated rainfall (in inches) last 12 hrs. till 6AM-some random spot checks/values. (attached to post) #onwx #onstorm

Current HRRR 0Z run -Radar 4cast + Total rainfall "trail" (in inches-scale on top) look's like most places will get a decent shot of rain overnight. #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

Shot of colder air late Sunday thru Tues 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. ''Tis the season"...now that it's October.🍂🍁🎃 #onwx #onstorm