🥈With a mean wind of 31km/h, yesterday was #Ottawa's windiest Nov 17th in 70 years, since 1955. #YowWx #OttWeather #YOW #OttNews #ONWx
November 18, 2025 at 12:17 PM
🥈With a mean wind of 31km/h, yesterday was #Ottawa's windiest Nov 17th in 70 years, since 1955. #YowWx #OttWeather #YOW #OttNews #ONWx
Today is #Ottawa's 10th consecutive November snowfall day which puts this run in 5th place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx
November 18, 2025 at 11:59 AM
Today is #Ottawa's 10th consecutive November snowfall day which puts this run in 5th place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx
Always good to check how the soil (ground) temps are doing. The model uses a depth of 4" (10cm) to predict soil temps,-again not perfect (urban areas) #onwx #onstorm -how consistent is it < 0C, during the week, or the daily diurnal cycle-helps with is the ground frozen yet?
November 18, 2025 at 3:54 AM
...Same run time as noted in previous post, take this with "a pound of salt"👍 GFS does way better in general with upper air features,-than surface one's. But here's its "idea" of the make up of storms systems traversing US/CAN. It has the right general "idea". #onwx #onstorm
November 18, 2025 at 2:16 AM
...the GFS is not that far off-compared to the EURO ens. From now till Dec. 3. -Pattern change late next week, injection of much colder air rescheme. My map-plotted 850mb temps (~5k/ft.-up) & Mid-level-HGTS/flow,-once you see the dark blues/purples your in the -20 C or lower. #onwx #onstorm
November 18, 2025 at 1:57 AM
The weakening winds & snow bands, shifting N from Huron/Bruce counties in the overnight. Weak system will slide just S of the L. Lakes Tues.-increasing cloud in SWONT,-risk of a shower/wet flurry (Essex C).High pressure will then build into the L. Lakes Wed./Thurs. #onwx #onstorm
November 17, 2025 at 11:29 PM
Date: November 17, 2025
Issued by: National Climate Change Warning Center
Georgian Bay #Canada snow squalls add 5–10 cm near Barrie–Collingwood #Canada as warmer lakes feed intense lake-effect bands in a changing climate. Whiteouts possible. #ONStorm #ONwx #ClimateChange
Issued by: National Climate Change Warning Center
Georgian Bay #Canada snow squalls add 5–10 cm near Barrie–Collingwood #Canada as warmer lakes feed intense lake-effect bands in a changing climate. Whiteouts possible. #ONStorm #ONwx #ClimateChange
November 17, 2025 at 12:54 PM
Date: November 17, 2025
Issued by: National Climate Change Warning Center
Georgian Bay #Canada snow squalls add 5–10 cm near Barrie–Collingwood #Canada as warmer lakes feed intense lake-effect bands in a changing climate. Whiteouts possible. #ONStorm #ONwx #ClimateChange
Issued by: National Climate Change Warning Center
Georgian Bay #Canada snow squalls add 5–10 cm near Barrie–Collingwood #Canada as warmer lakes feed intense lake-effect bands in a changing climate. Whiteouts possible. #ONStorm #ONwx #ClimateChange
Looking at the week ahead with the EURO & the CAN (attached) -Mon 7AM thru Sat. 7AM, both hint at some weather moving thru SWONT Tues. (system clipping SE-ward) -a more robust system on Fri.-looks like mainly rain (liquid) for SONT. Both have that gone by the weekend. #onwx #onstorm
November 17, 2025 at 1:45 AM
Latest hourly run of the HRRR18 - Radar 4cast- (P-type) from now till noon on Monday. Lake squalls continue in the traditional snow belts. Added lowest model CAPE values, to show the energy the warmer lake are adding to the LE, most prevalent in S. L. Huron/GB/LE #onwx #onstorm
November 17, 2025 at 1:12 AM
7pm EST (00Z) Synoptic "Snapshot" of the weather for S. Ontario. #onwx #onstorm Sidebar-in the next few months of winter😒👎 you will often see a "dashed black line" over the lakes-it's called a "thermal trough"-an elongated area of low pressure caused by the warm lake waters.
November 17, 2025 at 1:01 AM
Date: November 16, 2025
Issued by: National Climate Change Warning Center
Intense Georgian Bay #Canada #snow squalls bring 15–30 cm to Barrie–Collingwood, fueled by open water and warmer lakes in a changing climate. Travel could shut down. #ONStorm #ONwx #ClimateChange #LakeEffect!!
Issued by: National Climate Change Warning Center
Intense Georgian Bay #Canada #snow squalls bring 15–30 cm to Barrie–Collingwood, fueled by open water and warmer lakes in a changing climate. Travel could shut down. #ONStorm #ONwx #ClimateChange #LakeEffect!!
November 16, 2025 at 9:54 PM
Date: November 16, 2025
Issued by: National Climate Change Warning Center
Intense Georgian Bay #Canada #snow squalls bring 15–30 cm to Barrie–Collingwood, fueled by open water and warmer lakes in a changing climate. Travel could shut down. #ONStorm #ONwx #ClimateChange #LakeEffect!!
Issued by: National Climate Change Warning Center
Intense Georgian Bay #Canada #snow squalls bring 15–30 cm to Barrie–Collingwood, fueled by open water and warmer lakes in a changing climate. Travel could shut down. #ONStorm #ONwx #ClimateChange #LakeEffect!!
It's honking out there (sailor term) -thought I'd take a look since the house shook a few times with some really solid gusts funneling thru the neighborhood😬 Loop: 10:13AM thru 3:57 PM EST. Speed MAX gusts in mph from various wx stations/buoys. (1mph-~1.6 k/hr.) #onwx #onstorm
November 16, 2025 at 9:10 PM
Noticed several reports with graupel,-thought I'd pull up this morning's 12Z HRRR & see where it placed the favored areas for graupel production in convective clouds. Colours-lime grn/yel/reds=good chance the little buggers would form #onwx #onstorm White❄️=snow/graupel report
November 16, 2025 at 7:18 PM
#ONwx 11:44 AM ET - Snow Squall Watch issued for additional areas off Lake Huron.
Total snowfall accumulations of 15 to 30 cm possible, with the highest amounts expected in the most persistent lake effect snow bands.
Total snowfall accumulations of 15 to 30 cm possible, with the highest amounts expected in the most persistent lake effect snow bands.
November 16, 2025 at 4:44 PM
#ONwx 11:44 AM ET - Snow Squall Watch issued for additional areas off Lake Huron.
Total snowfall accumulations of 15 to 30 cm possible, with the highest amounts expected in the most persistent lake effect snow bands.
Total snowfall accumulations of 15 to 30 cm possible, with the highest amounts expected in the most persistent lake effect snow bands.
#ONwx Snow squalls will begin for areas off Lake Huron and Georgian Bay late in the day on Sunday, bringing 25 to 50 centimetres of snow to the hardest hit areas.
Some snow is expected during the day Sunday, but snow squalls are expected to form and intensify during the evening hours.
Some snow is expected during the day Sunday, but snow squalls are expected to form and intensify during the evening hours.
November 16, 2025 at 3:54 PM
#ONwx Snow squalls will begin for areas off Lake Huron and Georgian Bay late in the day on Sunday, bringing 25 to 50 centimetres of snow to the hardest hit areas.
Some snow is expected during the day Sunday, but snow squalls are expected to form and intensify during the evening hours.
Some snow is expected during the day Sunday, but snow squalls are expected to form and intensify during the evening hours.