General Weather BBQ Forum (Worldwide)

SnowBound

One of Us
Jul 7, 2007
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Northern Beaches, Sydney
Northern England and much of the EU Alps will see to snow to low levels from Tuesday (local time) to Friday, next week.
An atypical winter pattern has emerged late-Spring.
ecmwf_z500_mslp_eu_5.png
I'll let the In-Laws know ;)
 

BlueHue

One of Us
Ski Pass
Apr 17, 2003
3,003
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46
South of Cooma
An aerial photo of far south coast of NSW in 2020 that perfectly captures the lurch from severe bushfires to flooding rain on NSW Six Maps. Assume it is taken sometime after the big Feb 2020 rain event.

Bushfire flood contrast.JPG
 

Hermon

One of Us
Aug 24, 2008
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Quite a significant heatwave in the Pacific NW region of the USA over the next few days.

Portland Oregon might exceed 45c which is rather extreme for them, before cooler air drifts in off the Pacific Ocean. Quite remarkable temp gradients between the coast and just inland.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
22,398
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Penticton, BC
Weather reporting here speaking of a "heat dome" super stable high pressure sitting over the PNW. Hot days happen every summer, but this one appears set to hold for a full week. Forecast temps will break all time records in many towns and cities if they prove to be correct.

We've already had a record dry spring in southern BC, and snowpack was only 80-100% of average, so there's not much moisture even up high. A week of 40 virtually guarantees bushfire starts. We've already had a few small ones that have been quickly suppressed, but inevitably one or two will get away. Probably the biggest risk is a cold front moving in when the high finally breaks down. The thunderstorm activity that often accompanies could spark a fire season of biblical proportions.
 

Hermon

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Aug 24, 2008
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Weather reporting here speaking of a "heat dome" super stable high pressure sitting over the PNW. Hot days happen every summer, but this one appears set to hold for a full week. Forecast temps will break all time records in many towns and cities if they prove to be correct.

We've already had a record dry spring in southern BC, and snowpack was only 80-100% of average, so there's not much moisture even up high. A week of 40 virtually guarantees bushfire starts. We've already had a few small ones that have been quickly suppressed, but inevitably one or two will get away. Probably the biggest risk is a cold front moving in when the high finally breaks down. The thunderstorm activity that often accompanies could spark a fire season of biblical proportions.
Yep, the coniferous forests are going to be in big trouble if this heatwave drags on.
 

Billy Bob

Hard Yards
Nov 23, 2020
92
232
33
Bungendore
The heat in western Canada is just mind boggling. Lytton BC smashed the Canadian record today (Sunday) with 46.1C (previously 45C); also easily the highest temp north of 50N. It could go higher on Monday or Tuesday. After that temperatures fall back to 'only' the mid 30s.


Kamloops has clocked up two days above 40C with a few more to come. They have NEVER recorded 40 in June before. Kamloops early summer averages are identical to Bungendore's, 13/26. The Bungendore record is probably 41-42C, around what Kamloops has had so far.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
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Penticton, BC
Be prepared for more boggle today as the heat dome spreads north and east. Parts of Yukon and NWT have heat warnings. Could get close to 40 at or beyond 60 N.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
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Penticton, BC
Flooding evacuations around Pemberton, 45 minutes north of Whistler at the same time as they are at Extreme level bushfire danger. The 40 C temps have accelerated snowpack and glacial melting and the river channels can't handle the sudden jump in flow.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
22,398
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Penticton, BC
Some media outlets saying yesterday's new Canadian record is warmer than any temp ever recorded in true desert Las Vegas.
 

Billy Bob

Hard Yards
Nov 23, 2020
92
232
33
Bungendore
I know connells loves his heat and it's fascinating from a pure weather nerd perspective, but shit this is scary. Only 0.1C off the NSW record (Menindee, 49.7C if memory serves me correctly). 49.6 is around the 'best' Australia has done in the last decade, too.

The NH has more land at high latitudes of course so- pound for pound- will record more extreme temps at higher latitudes. But it's still unbelievable. Australia's temps at the very extreme end could be attenuated by background SSTs, whether in the Indian Ocean (Pilbara) or the Southern Ocean (outback SA/NSW/QLD). The Southern Ocean in particular is warming a lot slower than elsewhere, certainly much slower than the continents of the NH.

Though places like Oodnadatta and Marble Bar don't get a true seabreeze, milder air filtering across the land from the nearby oceans at night could play a role in moderating temps such that the heat bank gets flushed out a little. There are no real mountain ranges to block nocturnal incursions of maritime air. The Rockies and Cascades are very effective at blocking maritime air. The climate in eastern Oregon and Washington, and to a lesser extent interior British Columbia, is normally much hotter and drier in summer than west of the mountains. It is full blown desert in eastern Oregon, quite a contrast to the state's rainy image.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
22,398
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Penticton, BC
Easy to see the effects of terrain and lake moderation yesterday during the 4-5 pm peak heat period. Watching vehicle thermometer as I drove from Kelowna Airport (45°C) through downtown and across the bridge (41°C), then watched the temp rapidly rise as the highway climbs and diverts away from the lake through West Kelowna. Right in the highest elevation stretch where Mt Boucherie is between the road and the lake, i observed temps of 46 and 47°C. Leaving the little mountain behind, temp dropped to 44 through West K centre. Then comes the fast descent back to lakeside in Peachland, down to 41 again.

Kelowna temps record consistently more extreme than Penticton because its airport reporting station is 10 km distant from Okanagan Lake whereas Penticton is only a few metres from Skaha Lake. The climate is a different story though, considerably higher degree days for agriculture even though just 60 km south.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
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Penticton, BC
Poor Lytton, they break the all time heat record three times in three days and now the village is burning. The high pressure has moved east and the 70 kmh winds in its aftermath have fanned a fire burning south of town, possibly a second fire started as well. The mayor has evacuated the town, cell service is down, Trans Canada closed in both directions, much confusion. Bad situation, hope everyone survives.
 
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sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
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Penticton, BC
Video of Lytton starting to show up in media. The fire has moved 20 km in an hour and the village has burned. The deep canyon is a classic wind tunnel.

Meantime there have been thousands of lightning strikes through the centre of the province, convection created in the wake of the slow moving high pressure dome. Looking like a repeat of the 2017 fire season.

Lastly, reports coming in of hundreds of deaths in Vancouver from the extreme heat. Ambulance service hugely backed up, still bodies not yet picked up.
 

sly_karma

Green Bastard
Ski Pass
Dec 12, 2005
22,398
16,393
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Penticton, BC
Media reporting 90% of buildings gone, including ambulance station, RCMP, power substations, mobile phone tower. Appeals all day for residents to check in with emergency services. There are people missing but no one is saying how many yet. These will be BC's first civilian bushfire deaths in many years. Fire was likely started by a CN train, there are always sparks generated by wheel flanges grinding against the tracks on sharp curves. Lots of curves in the hot dry upper canyon, so there are frequent small fires. Extreme weather conditions caused this one to explode.

Seems like a smaller scale version of Black Saturday in Victoria. People had no idea there was a fire nearby, evacuation order was signed when the town was already on fire.
 

Hermon

One of Us
Aug 24, 2008
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Worth noting that Southern California - Arizona - Nevada is cooking this week. 48c forecast for Las Vegas, 52c at Furnace Creek...
 
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Hermon

One of Us
Aug 24, 2008
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Meanwhile in Flagstaff Arizona, a Toyota Prius has been spotted moving faster than ever before:
 
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Freizeit

Hard Yards
May 23, 2020
32
45
68
Sydney
did anyone hear about the massive flood happening in Zhengzhou, China in the last two days? I was wondering what's the long-term (Aug to Oct) climate look like for China? Anyone maybe can share a website or some insignts? I am totally new to weather. Thank you
 
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