Heat Bursts (temperature, towns, degree, normal)

[Ed's Mountain]

Wow, incredible overnight temperatures in Southern Alberta--I think from heat bursts? Check out Irvine: 30.5°C at 0500h.


Source: https://twitter.com/Pat_wx/status/15...NMesKojWR_domQ

[Cambium]

Originally Posted by Ed's Mountain

Wow, incredible overnight temperatures in Southern Alberta--I think from heat bursts? Check out Irvine: 30.5°C at 0500h.


Source: https://twitter.com/Pat_wx/status/15...NMesKojWR_domQ

Not sure if that would qualify as a heat burst. Maybe just winds carrying very hot air. Was there a jump to 30C or gradual warming overnight?

[Ed's Mountain]

Originally Posted by Cambium

Not sure if that would qualify as a heat burst. Maybe just winds carrying very hot air. Was there a jump to 30C or gradual warming overnight?

The largest jump was 8°C in one hour. Maybe just warm winds then.

[memph]

Originally Posted by Ed's Mountain

The largest jump was 8°C in one hour. Maybe just warm winds then.

8C in an hour at night seems like a lot. Especially considering it's warming to temperatures that are so unusual in the early AM hours. It's not like this is a 1 hour night-time increase from -4C to 4C in March while a warm front is moving in.

[Joe90]

Had quite a dramatic rise here in early October 2004 - temperature was around 7C at midnight but 24C by 4:00am.

Was a foehn effect - while a gentle breeze here, very strong winds 20-50km inland that bowled over a million mature plantation pines.

[memph]

Originally Posted by Joe90

Had quite a dramatic rise here in early October 2004 - temperature was around 7C at midnight but 24C by 4:00am.

Was a foehn effect - while a gentle breeze here, very strong winds 20-50km inland that bowled over a million mature plantation pines.

How unusual is 24C at 4am in October? You October means are pretty similar to our means for late May/early June or September, and it's not unheard of to have lows of 24C or close at those times of the year. However, a low of 30C in Lethbridge is pretty unheard of, I think it would be extremely rare to get lows above 22-23C there in early September, let alone 30C.

[Joe90]

Originally Posted by memph

How unusual is 24C at 4am in October? You October means are pretty similar to our means for late May/early June or September, and it's not unheard of to have lows of 24C or close at those times of the year. However, a low of 30C in Lethbridge is pretty unheard of, I think it would be extremely rare to get lows above 22-23C there in early September, let alone 30C.

Extremely unusual - even in mid summer it would be extremely rare.

Temperature was around 7C at midnight, but I don't know when the temperature started rising - it may have risen to 24C over a much shorter period.

While it reached 24C here, some people observed 27C.

[memph]

Originally Posted by Joe90

Extremely unusual - even in mid summer it would be extremely rare.

Temperature was around 7C at midnight, but I don't know when the temperature started rising - it may have risen to 24C over a much shorter period.

While it reached 24C here, some people observed 27C.

Perhaps it was a foehn wind for Medicine Hat too, but the temperature spike that resulted was truly quite exceptional.

Let me put it this way, it would be less unusual to get frost in the early AM hours at this time of year...

Warmest temperatures recorded between Aug 20 and Sept 20 at 12:00am to 6:00am at Medicine Hat in from 2009 to 2022. Most of these occurred at 12am-1am, Sept 4 was especially unusual in that it occurred at 4am.

29.6C - 4AM, Sep 4, 2022
26.6C - 12AM, Aug 22, 2019 (23.9C at 4AM)
26.3C - 1AM, Aug 26, 2013 (20.1C at 4AM)
25.9C - 2AM, Sep 17, 2009 (24.5C at 4AM)
26.0C - 1AM, Aug 30, 2017 (24.6C at 4AM)
25.6C - 12AM, Aug 27, 2010 (14.9C at 4AM)
24.5C - 1AM, Aug 20, 2022 (22.8C at 4AM)
23.5C - 12AM, Aug 23, 2011 (21.4C at 4AM)
23.3C - 12AM Aug 22, 2022 (19.4C at 4AM)
23.3C - 12AM, Sep 6, 2013 (21.9C at 4AM)
23.3C - 12AM, Sep 3, 2013 (22.1C at 4AM)
23.3C - 12AM, Sep 1, 2012 (21.1C at 4AM)
23.1C - 12AM, Aug 28, 2012 (14.5C at 4AM)
23.0C - 5AM, Sep 1, 2016 (18.8C at 4AM)
22.0C - 1AM, Sep 3, 2017 (15.1C at 4AM)
21.9C - 12AM, Aug 21, 2022 (19.2C at 4AM)
21.8C - 12AM, Sep 8, 2009 (19.1C at 4AM)
21.7C - 12AM, Aug 23, 2022 (18.5C at 4AM)
21.6C - 3AM, Sep 8, 2017 (18.7C at 4AM)

This 30C temperature occurred over a large area, from Seven Persons, AB to Irvine, AB and through Medicine Hat is about 50km east-west. Medicine Hat to Onefour is 100km north-south.

[memph]

Hourly Temperatures in Medicine Hat from Sept 3 to Sept 4, 2022

12AM: 17.6C
1AM: 18.0C
2AM: 16.7C
3AM: 17.1C
4AM: 16.1C
5AM: 15.9C
6AM: 15.7C
7AM: 13.8C
8AM: 16.6C
9AM: 19.9C
10AM: 24.5C
11AM: 27.6C
12PM: 31.0C
1PM: 34.7C
2PM: 36.8C
3PM: 37.2C
4PM: 37.9C
5PM: 38.0C
6PM: 36.5C
7PM: 33.9C
8PM: 30.9C
9PM: 28.2C
10PM: 22.9C
11PM: 23.0C
12AM: 25.6C
1AM: 24.1C
2AM: 22.5C
3AM: 22.1C
4AM: 29.6C (+7.5C/hr!)
5AM: 25.3C
6AM: 22.1C
7AM: 18.3C
8AM: 18.2C
9AM: 20.5C
10AM: 23.5C
11AM: 26.0C
12PM: 26.7C
1PM: 28.2C
2PM: 30.1C
3PM: 32.9C
4PM: 33.6C
5PM: 33.6C
6PM: 32.2C
7PM: 29.8C
8PM: 24.8C
9PM: 25.1C
10PM: 20.8C
11PM: 19.5C
12AM: 17.2C

So record hot temperatures followed by southern wind?

[NORTY FLATZ]

Been warm here too. For about 10 days straight.

Gotta tropical storm coming in tomorrow. Looks like I won't be riding the Triumph to work, like I usually do. Gotta take the cage. I hate taking the cage. But, it IS nice having a windshield (and wipers) and A/C, so there's that.