Ottawa Weather Records🌤
@YOW_Weather
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Rolf Campbell: Weather historian and forecaster. I gather statistics from Environment Canada and across the web to generate alerts & forecasts.
Ottawa, Ontario, Canada
Joined October 2013
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Fastest flash freeze ever recorded.
In the past 6 hours, the temperature has dropped 22.7°C (from +15.6°C to -7.1°C); which is the largest 6-hour drop on record.
The previous record was 22.3°C on May 23rd, 1992.
#OttWeather
#OttNews
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⚡⚡⚡ Some of the weather models are now predicting thundersnow tonight between 1am and 2am. :)
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For the first time since April 18th, 1985; the Ottawa airport currently reports Thunder Freezing Rain!
#OttNews
#OttWeather
#xp
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Anyone notice a funny pattern about storms this winter?
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For the first time since records began in 1953, the Ottawa Airport reports Thundersmoke!
#OttNews
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Major snowstorm on track for Monday. If you have plans for Monday, cancel them. This is a once-per-decade event. Major roads may become impassible to smaller vehicles. Cars will litter the sidestreets, and those without snow tires will fill the ditches.
#OttNews
#snowmageddon2022
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This storm is going to start in just a few hours. I still have no idea what's going to happen. Anything is still on the table. All rain? Maybe. 50cm of snow? Maybe. Locusts? Four horsemen? Maybe.
The one thing I am certain of, it will be windy. Expect power outages.
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Official snow total from the Ottawa airport as of 5am: 13cm.
DM me for my address.
If we get more than 10cm tonight, I'll come and shovel your driveway. That's how confident I am that it isn't happening.
@mattskubeCTV
@Move100Ottawa
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With a noon snow total of 41cm, today is
#Ottawa
's snowiest January day in more than 100 years, since Jan 29th, 1894.
#OttWeather
#ONWx
#OttNews
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Severe thunderstorms are possible this afternoon including 90km/h winds, up to 50mm of rain and "lime sized hail" in the Ottawa region. I've honestly never seen anyone use limes as a sizing category before. I guess it's Margarita season.
#OttNews
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Ottawa has received an entire month's rain in the past 2 days alone, and it's still raining....
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Tornado Watch (not warning) for Ottawa today. The risk for tornados is most likely between 1pm and 6pm today. This is a 5pm plot of the NAM weather model. "X" marks Ottawa.
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Ottawa is the hottest location in Canada right now. Enjoy it!
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Longest thunderstorm in over 5 years. The Ottawa airport has been reporting a continuous thunderstorm since 11:41am today. Longest since August 2018 when a thunderstorm lasted for more than 3 hours.
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For those that are not impressed by the snow yet, I should warn you that the heaviest band has not started yet.
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2:10pm and the snow shield is still barely holding on. This is the prettiest looking snow shield I've ever seen. Almost like the eye of a hurricane.
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These 2 storm systems are going to collide over Ottawa tonight. Heavy snow and maybe even some ⚡⚡ thundersnow tonight before everything turns into a mess tomorrow. Good luck with your holiday travels. Be safe.
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With a 5pm snow total of 48cm, today is
#Ottawa
's snowiest January day in more than 100 years, since Jan 29th, 1894.
#OttWeather
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FYI Ottawa: No matter what you remember from your childhood, Ottawa has never received 60cm of snow in a single day; and unless you've been alive more than 70 years, nobody has seen a 2-day storm that dropped 60cm either.
We've had storms with drifts, but that's not the same.
@YOW_Weather
@Vettz22
You said once in a decade event...its 30-40 cm, significant, but not once in a decade snow. 60cm then we start talking
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With a 5pm snow total of 31cm, today is
#Ottawa
's snowiest December day in almost 10 years, since Dec 21st, 2012.
#ONWx
#OttNews
#OttWeather
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149
A powerful ⚡storm is heading towards
#Ottawa
. This is a long-lived storm that could produce a derecho. These storms are hard to predict, and can dissipate abruptly, expect it in Ottawa around 5pm➜6pm. I would cancel any outdoor plans during that time.
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Longest continuous snowstorm ever recorded in
#Ottawa
. After 59 consecutive hours of snowfall, the weather was "Partly Cloudy" today at 9am. We broke the all-time record by 1 hour.
#OttNews
#OttWeather
#ONWx
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143
Record breaking snowstorm possible this week.
Storm models are all consistently suggesting a 30cm..50cm snowfall Tuesday/Wednesday.
During the past 30 years,
#Ottawa
has only had 3 40+cm storms:
▸Mar 13/14, 1993
▸Mar 7/8, 2008
▸Dec 21/22, 2012
▸Feb 16, 2016
#Snowmaggedon2019
Who wants more snow? Models are suggesting the possibility of 30-50cm of snow Tuesday+Wednesday.
The daily records are:
Tuesday: 33cm [1901/1918]
Wednesday: 29cm [1993]
#SnowMageddon2019
#OttWeather
Forecasts beyond 3 days are meant for entertainment purposes only.
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Incoming thunderstorms! And the temperature is still well below 0°C. This could get messy.
#xp
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Ottawa snowpack is officially down to 34cm as of this morning.
Based on previous melt rates, the most likely day that we will drop below 1cm is April 3rd.
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During the last 2 days, Ottawa has received so much rain that even if we get *nothing* for the rest of the month, it will still be one of the wettest Augusts in history.
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With a 3pm snow total of 46cm, today is
#Ottawa
's snowiest January day in more than 100 years, since Jan 29th, 1894.
#OttWeather
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The people have spoken. I will now limit my use of "large snowstorm" to storms that could realistically drop more than 25cm.
Thanks to everyone who participated.
For Ottawa, what would you consider a "large snowstorm"?
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Thunder snow pellets (mixed with freezing rain) did occur last night. 4 bolts of lightning were recorded in the Ottawa area (3 in Dunrobin, and a 4th farther West).
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It hasn't snowed* in 15 days. Jan/Feb are Ottawa's snowiest months. The last time we saw such a drought was during 2009.
And if you believe the forecast, we could easily hit 22 days, which has only happened once before: Jan 28 ➜ Feb 28, 1978.
* At least 1cm in any given day.
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Large snowstorm is expected on Wednesday/Thursday. All 3 of the most popular storm models agree, which means this is a high confidence forcast. I would avoid travel on those days.
**Forecasts beyond 3 days are for entertainment purposes only.
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I don't think I've ever seen a month as crazy as this May. Several record lows, and multiple record highs.
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A significant winter storm is coming late on Thursday. It's going to be a big mess. Rain, then a flash freeze with lots of snow. All public forecasts are under-estimating this storm.
How much snow do you think will fall (at the airport) Thursday and Thursday night?
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A perfect example of the storm shield in action. Storms on almost every side of Ottawa.
Shields are holding....
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Near record snow. 46.0cm of snow brought
#Ottawa
within 9.9cm of the most snow recorded during any single day.
#OttNews
#OttWeather
#ONWx
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With 1 day remaining,
#Ottawa
is already in 3rd place for snowiest meteorological winter since records began.
#ONWx
#OttWeather
#OttNews
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Who wants
#thundersnow
? There is a small chance of some thundersnow around 10:00am tomorrow as a cold front passes over
#Ottawa
.
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Who wants a "Huge Snowstorm" next weekend?
This is *low confidence*, but a very impressive potential for next weekend.
**Forecasts beyond 3 days are for entertainment purposes only.
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Get ready Ottawa. After a slow start to this winter, things may turn around this weekend. Saturday could be the largest 1-day snowfall in years.
More details available at (pay service).
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The next 7 days are forecast to hit at least 22°C each. It's been more than a century since we had a week of 22°C days this late in the year.
October 5-11, 1913 was the last time.
#OttWeather
#OttNews
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With a 10am snow total of 34cm, today is
#Ottawa
's snowiest January day in more than 50 years, since Jan 30th, 1966.
#ONWx
#OttWeather
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Ottawa hit 26°C every single day during July 2020; which makes it the only month in recorded history to do so.
#OttNews
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Twitter is suspending all of my API accounts -- forcing me to sign up to their new API billing model. I think I can still use their free tier, but my account might not post for a while until I get this figured out.
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🥇Today is
#Ottawa
's 146th consecutive day with ≥1cm snow depth which extends our 1st place run of the longest snow cover on record.
Even yesterday's +10°C sunshine was only able to take us down to 2cm of snow cover (at the airport) this morning at 8am.
#OttWeather
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As expected, an "atmospheric river" has formed pulling moisture from the Gulf. Tomorrow morning, this should flow over Ottawa which will bring the heavy snows. It's rare to see such a well formed river presented on radar like this.
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I'm currently getting my snowblower out of storage for a reason.
We might have the first small snowstorm of the season Tuesday night.
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The Ottawa airport just recorded its biggest temperature bounce in almost 40 years (since something similar happened on July 11th, 1980). The temperature dropped from 29.3°C to 21.4°C and then bounced back up to 28°C in a 2 hours period.
#OttWeather
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Ottawa's 11pm temperature was 20.8°C. Never before has Ottawa been this warm at 11pm so late in the year. The previous record was October 9th, 2018.
#OttWeather
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In a twist of events, Ottawa's snow shield has flipped polarity and is now holding a dome of snow over the city.
#OttWeather
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Ottawa's 2022/2023 snow season passed 200cm today; becoming only the 10th season to cross that boundary before Jan 31st.
#OttNews
#OttWeather
#ONWx
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Who wants more snow? Models are suggesting the possibility of 30-50cm of snow Tuesday+Wednesday.
The daily records are:
Tuesday: 33cm [1901/1918]
Wednesday: 29cm [1993]
#SnowMageddon2019
#OttWeather
Forecasts beyond 3 days are meant for entertainment purposes only.
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FYI: I will be on CBC Radio Ottawa tomorrow morning (Friday) at 8:20am for 7 minutes.
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Today at 8am, the windchill was -39.2 which made it
#Ottawa
's windchilliest hour in more than 3 years, since Jan 21st, 2019
#OttWeather
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Sudden and abrupt weather pattern change!
Winter is over. Welcome to spring.
It's going to rain almost every day for the next week.
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Who wants more snow?
#Ottawa
's biggest snowstorm of the season is possible late next week.
#OttWeather
**Forecasts beyond 3 days are for entertainment purposes only.
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All 3 of the most popular long range weather models now predict a monster winter storm on Dec 23rd/24th. White Christmas=Yes, but be careful about planning travel on those days.
**Forecasts beyond 3 days are for entertainment purposes only.
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With more snow coming, let's celebrate with Ottawa's 4th annual snow-melt guessing game. When will the snow depth at the Ottawa airport first drop below 1cm?
You must retweet this to qualify! Rules attached.
Earliest: Feb 21, 1981
Latest: Apr 22, 1971
Median: Mar 28.
#OttWeather
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Watch the Ottawa Rain Shield in action. The storm just melts away to nothing as it approaches Ottawa.
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As of 9am today,
#Ottawa
has received 199.4cm of snow. I expect by 10am today, we will have crossed the 2-metre mark. We already have more snow than 10 of the past 30 years had during their entire winter.
#OttWeather
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Tomorrow night's storm is starting to look pretty exciting. The HRDPS predicts a widespread area of 15-30cm, with maybe some pockets of up to 45cm.
PS: This is just one model, this is not a forecast.
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4 days ago, we were 35°C and we were 2.8°C this morning.
I did some digging, the last time Ottawa saw > 34°C and < 3°C in a 5 day period was in September 1939!
① June 1884
② May 1921
③ June 1934
④ Sept 1939
⑤ May 2020
#OttNews
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Today's ~7am temperature (-32.5°C) was
#Ottawa
's coldest temperature in more than 20 years, since Jan 31st, 1996.
#OttNews
#OttWeather
#ONWx
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93
Who wants snow this weekend? Between 5cm and 20cm are possible this Sunday.
**Forecasts beyond 3 days are for entertainment purposes only.
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90
#FlashFreeze
coming tonight. Temperature could drop 24°C (from +4°C to -20°C) in just 15 hours. On average, we get that type of flash freeze about once every 2 years.
Last time was Feb 2rd, 2023.
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92
My official forecast for snowfall this winter in the Ottawa region: Warm and slushy. Less than 200cm of snow in total; with lots of melts.
Note: Forecasts beyond 3 days are for entertainment purposes only.
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#Ottawa
's total snow this September was 0.0cm. Equal to the average of 0.0cm and within the normal range of 0.0➞0.0cm.
#OttWeather
10
22
89
Most of the city is finally getting some heavy rain this morning.
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I don't want anyone to get too excited, but there's a small chance of some ⚡
#ThunderSnow
⚡ in the
#Ottawa
area this afternoon around 2pm as a cold front pushes through.
#OttWeather
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88
Welcome to another edition of Thunderstorm Thursday. Park your cars and kids inside for the next couple of hours.
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Here's the lightning strike map for last night. Pretty good coverage across the city, especially to the South.
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🥇With a max gust of 86km/h, today is
#Ottawa
's windiest Dec 23rd since records began in 1955.
#OttNews
#OttWeather
#ONWx
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🥇With a 2pm snow total of 45cm, today is
#Ottawa
's snowiest Jan 17th since records began in 1873.
#ONWx
#OttNews
#OttWeather
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87
New bot test. If you can see this, all by twitter bots are still down, but I'm making progress.
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Welcome to spring,
#Ottawa
.
Starting today, the median high temperature in Ottawa is above 0°C every single day until Dec 7th.
Warning: It's normal to get more than 30cm of snow after March 7th.
#OttWeather
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86
An intense cold front could bring some
#Thundersnow
to the
#Ottawa
region today around noon, just before the temperature drops dramatically.
The last time the airport reported Thundersnow was Feb 12, 1997, more than 20 years ago.
#OttNews
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Apparent tornado in the Barrhaven area. Take this storm seriously!
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Final cloud cover prediction for tomorrow's eclipse. We're going to be right on the edge of a warm front. I'm going to head East. Southern Quebec seems like the only area that has a high probability of clear skies that is within driving range. Sorry Toronto.
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87
How bad is this ice storm going to be tomorrow? It depends on which model you trust. The GDPS model shows 70mm of freezing rain before it gets above zero. I think that's unlikely, but not impossible.
I would rethink any travel plans tomorrow.
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The Ottawa snow shield is operational but failing quickly. Snow should have started about an hour ago, but the shield has held it off. I expect the shield to collapse over the next 1 to 2 hours.
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With a 1pm temperature of 14.9°C, today is Ottawa warmest day since October 19th.
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Remember that 2nd flash freeze I warned you about a couple of days ago? What if it also came with a bunch of snow? I wouldn't make any plans for Thursday evening.
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