Rob’s Obs
@robsobs.bsky.social
Retired Environment Canada meteorologist. Niagara region, Canada
All time hottest September temperature for Canada set today at Ashcroft BC with a sizzling 40.8C. Beats previous record of 40.0C set in Morden MB (Sep 1906), Lost River SK (Sep 1940) and Lytton BC (Sep 2025) (TWN graphic)
September 4, 2025 at 2:23 AM
All time hottest September temperature for Canada set today at Ashcroft BC with a sizzling 40.8C. Beats previous record of 40.0C set in Morden MB (Sep 1906), Lost River SK (Sep 1940) and Lytton BC (Sep 2025) (TWN graphic)
Areas of heavier rainfall across Niagara over past 24 hours brought 25-50 mm over localized areas. Otherwise only 5-10 mm between heavier bands with less than 5 mm west of Grimsby.
July 1, 2025 at 11:28 AM
Areas of heavier rainfall across Niagara over past 24 hours brought 25-50 mm over localized areas. Otherwise only 5-10 mm between heavier bands with less than 5 mm west of Grimsby.
One lone band of cumulus clouds over Niagara nicely marks convergent zone between Lake Erie and Lake Ontario lake breezes this afternoon
June 28, 2025 at 8:06 PM
One lone band of cumulus clouds over Niagara nicely marks convergent zone between Lake Erie and Lake Ontario lake breezes this afternoon
CoCoRaHS report from Morriston ON, east of Cambridge.. 90 mm of rain last night in less than 90 minutes
June 28, 2025 at 12:15 PM
CoCoRaHS report from Morriston ON, east of Cambridge.. 90 mm of rain last night in less than 90 minutes
Quite the soaker through the Cambridge area last night.. upwards of 75-100 mm of rain reported, much of it falling between 10 pm and 1 am.
June 28, 2025 at 11:45 AM
Quite the soaker through the Cambridge area last night.. upwards of 75-100 mm of rain reported, much of it falling between 10 pm and 1 am.
Area of showers over Lake Ontario will clip north St Catharines into NOTL over the next hour. Heads up if your boating in this area for some gusty showers moving in.
June 26, 2025 at 4:43 PM
Area of showers over Lake Ontario will clip north St Catharines into NOTL over the next hour. Heads up if your boating in this area for some gusty showers moving in.
Quite the soaker across parts of Niagara this morning. Heavier cells early this morning gave 30-50 mm of rain through the Niagara Falls-Chippawa area in just over an hour. (Radar image from 530 am)
June 26, 2025 at 11:41 AM
Quite the soaker across parts of Niagara this morning. Heavier cells early this morning gave 30-50 mm of rain through the Niagara Falls-Chippawa area in just over an hour. (Radar image from 530 am)
33-36C temps over much of Niagara this afternoon.. except 28C near Lake Erie. Last day of the really hot stuff before less oppressive conditions Wednesday
June 24, 2025 at 7:29 PM
33-36C temps over much of Niagara this afternoon.. except 28C near Lake Erie. Last day of the really hot stuff before less oppressive conditions Wednesday
One more day of oppressive heat and humidity over Niagara today with highs of 35C over north Niagara to 28C near Lake Erie. A slight chance of showers or thunderstorms later today into tonight then not as hot Wednesday
June 24, 2025 at 11:21 AM
One more day of oppressive heat and humidity over Niagara today with highs of 35C over north Niagara to 28C near Lake Erie. A slight chance of showers or thunderstorms later today into tonight then not as hot Wednesday
St Catharines already up to 29C as of 9 am. Likely hitting a record high 35C this afternoon. Recall that two days ago Env Canada was forecasting a *high* of only 27C for St Catharines for today. Faulty forecast algorithm leading to poor temperature forecasts in Niagara.
June 23, 2025 at 1:43 PM
St Catharines already up to 29C as of 9 am. Likely hitting a record high 35C this afternoon. Recall that two days ago Env Canada was forecasting a *high* of only 27C for St Catharines for today. Faulty forecast algorithm leading to poor temperature forecasts in Niagara.
Lake Erie lake breeze has pushed up into northern Niagara as of 2 pm marked by edge of CU field. That has stabilized temperatures in the 27-30C range over south Niagara while 32-35C heat continues over north Niagara
June 22, 2025 at 6:34 PM
Lake Erie lake breeze has pushed up into northern Niagara as of 2 pm marked by edge of CU field. That has stabilized temperatures in the 27-30C range over south Niagara while 32-35C heat continues over north Niagara
Env Canada drastically underforecasting max temps for Niagara especially Monday and Tuesday. Actual highs will be some 8C above current forecast highs. I suspect this will be adjusted on subsequent forecasts..
June 21, 2025 at 9:15 PM
Env Canada drastically underforecasting max temps for Niagara especially Monday and Tuesday. Actual highs will be some 8C above current forecast highs. I suspect this will be adjusted on subsequent forecasts..
My forecast highs across Niagara Sunday through Tuesday. Hottest temps will across northern Niagara with highs of 33-36C each day. A bit cooler over south Niagara with SW flow off Lake Erie giving temps of 27-32C. Humidex values of 35-45C each day. Stay cool!
June 21, 2025 at 8:58 PM
My forecast highs across Niagara Sunday through Tuesday. Hottest temps will across northern Niagara with highs of 33-36C each day. A bit cooler over south Niagara with SW flow off Lake Erie giving temps of 27-32C. Humidex values of 35-45C each day. Stay cool!
Oddly, Env Canada drops forecast highs for Niagara on Mon/Tue to 26-27C after issuing heat warning for highs of 31-36C through Tuesday. Very inconsistent messaging there.. 🤔🤷🏼♂️
June 21, 2025 at 4:50 PM
Oddly, Env Canada drops forecast highs for Niagara on Mon/Tue to 26-27C after issuing heat warning for highs of 31-36C through Tuesday. Very inconsistent messaging there.. 🤔🤷🏼♂️
Quite the heatwave coming up for Niagara and GTA. Highs of 32-35C Sunday-Tuesday with peak humidex values in the 40-45C range. Likely hottest stretch of June weather in Niagara since June 2012.
June 21, 2025 at 4:46 PM
Quite the heatwave coming up for Niagara and GTA. Highs of 32-35C Sunday-Tuesday with peak humidex values in the 40-45C range. Likely hottest stretch of June weather in Niagara since June 2012.
Rainfall accumulation map based on personal weather station observations in St Catharines area. Most of this fell between 2 and 330 pm.
June 18, 2025 at 7:50 PM
Rainfall accumulation map based on personal weather station observations in St Catharines area. Most of this fell between 2 and 330 pm.
Quite the deluge over St Catharines over the past hour. Generally 25-50 mm over central and northern parts of the city.. much less to the south
June 18, 2025 at 7:11 PM
Quite the deluge over St Catharines over the past hour. Generally 25-50 mm over central and northern parts of the city.. much less to the south
Rain has finally ended in Niagara after 2 straight days of steady rainfall. 2 day totals of 40-70 mm across Niagara, Hamilton and Haldimand areas. #ONstorm
May 23, 2025 at 11:44 AM
Rain has finally ended in Niagara after 2 straight days of steady rainfall. 2 day totals of 40-70 mm across Niagara, Hamilton and Haldimand areas. #ONstorm
UPDATED rainfall totals across Niagara, Hamilton and Haldimand areas as of 5 pm May 22, since yesterday. Generally 30-60 mm of rain has fallen across the area.. heaviest amounts over west Niagara, Hamilton and Haldimand areas where 50-70 mm of rain has been reported. Creeks running high and fast.
May 22, 2025 at 9:36 PM
UPDATED rainfall totals across Niagara, Hamilton and Haldimand areas as of 5 pm May 22, since yesterday. Generally 30-60 mm of rain has fallen across the area.. heaviest amounts over west Niagara, Hamilton and Haldimand areas where 50-70 mm of rain has been reported. Creeks running high and fast.
MRMS radar accumulation product estimates over 70 mm of rain has fallen since yesterday in downtown Hamilton.. corroborated by personal weather sites in the area. Likely some flooding issues there..
May 22, 2025 at 6:28 PM
MRMS radar accumulation product estimates over 70 mm of rain has fallen since yesterday in downtown Hamilton.. corroborated by personal weather sites in the area. Likely some flooding issues there..
Updated rainfall totals as of noon across Niagara and Hamilton/Haldimand areas. Generally 30-50 mm of rain across Niagara so far with 45-60 mm over west Niagara/Haldimand into Hamilton areas. Light rain continues this afternoon into tonight with another 5-10 mm possible before tapering off Friday
May 22, 2025 at 4:38 PM
Updated rainfall totals as of noon across Niagara and Hamilton/Haldimand areas. Generally 30-50 mm of rain across Niagara so far with 45-60 mm over west Niagara/Haldimand into Hamilton areas. Light rain continues this afternoon into tonight with another 5-10 mm possible before tapering off Friday
Another day of record early heat over srn MB (May 13). Winnipeg's 37.0C is the earliest they've ever hit that temperature and ties May 22 1980 as 2nd hottest May day on record. Heat was accompanied by very low humidity (as low as 13%) and winds gusting to 70 km/h.. extreme fire weather conditions
May 14, 2025 at 1:19 AM
Another day of record early heat over srn MB (May 13). Winnipeg's 37.0C is the earliest they've ever hit that temperature and ties May 22 1980 as 2nd hottest May day on record. Heat was accompanied by very low humidity (as low as 13%) and winds gusting to 70 km/h.. extreme fire weather conditions
Max of 37.0C (99F) today, ties second hottest May temperature on record in Winnipeg. Data since 1872.
May 13, 2025 at 10:55 PM
Max of 37.0C (99F) today, ties second hottest May temperature on record in Winnipeg. Data since 1872.
Canada.. the land of extremes. While southern MB is dealing with extreme heat and out of control wildfires (see image showing smoke plumes from fires over SE MB), Goose Bay NL was digging out of a record 40 cm snowfall on May 11! Crazy contrast for mid May!
May 13, 2025 at 6:31 PM
Canada.. the land of extremes. While southern MB is dealing with extreme heat and out of control wildfires (see image showing smoke plumes from fires over SE MB), Goose Bay NL was digging out of a record 40 cm snowfall on May 11! Crazy contrast for mid May!