General Weather BBQ Forum (Worldwide)

Greysrigging

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Those Rocky Mountains cities have unbelievable forecasts over the next couple of days
Denver, Colorado
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And Caspar, Wyoming
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Near century heat then snow and frost 48 hours later ! Fire and Ice.....
And we grizzle about Melbourne's changeable weather..... lol !
A very strange forecast indeed....
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Greysrigging

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And a brutal summer ( continuing into September ) in the south west US.
Not a great deal of relief at night either....
( Imagine Marble Bar with a population of 2 million......... )
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Greysrigging

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Here is a complete and detailed rundown of the historical record heat event across SW California today (Sept. 6th) in the Record Event Report below. Click on the URL Below and be amazed. #cawx #LAheat #heatwave #Socal #LAweather http://go.usa.gov/xGDFv

Anaheim: 105F. Old record: 100, 2013
Santa Ana: 110F. Old record: 103 in 1984
San Diego: 100F. Old record: 97 in 2011
Oceanside Harbor: 85F. Old record: 83, in 2004
Vista: 107F. Old record: 102, in 2004
Chula Vista: 102F. Old record: 97, in 2011
Riverside: 117F. Old record: 115, in 1955
Lake Elsinore: 117F. Old record: 114, in 1955
San Jacinto: 114F. Old record: 108, in 1988
Escondido: 115F. Old record: 104, in 1955
Ramona: 112F. Old record: 102, in 1983
Big Bear: 87F. Old record: 83, in 1982
Idyllwild: 104F. Old record: 92, in 2013
Palomar Mountain: 98F. Old record: 94, in 1955
Campo: 110F. Old record: 104, in 1955
Palm Springs: 120F. Old record: 114, in 1986
Thermal: 17F. Old record: 115, in 2008
Indio: 116F -tie- 116, in 2008
Borrego: 117F. Old record 115, in 1989

MUCH cooler near the coast tomorrow out there.. Everyone else cools down starting Tuesday.. That said, Off Shore " Santa Ana " type wind event look likely at the same time across CA so it might not cool off as much as it could...

**Quick correction, in the Bay Area's list, Santa Cruz was actually 104F today ( a record. Old record was 98F in 2004 ) not 102F. Wasn't corrected before the data was posted.

Death Valley topped out at 122F today, a record.. Was 125F yesterday.. Also a record. Hard to believe either would be record highs there.
 
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whether

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That's at 350m asl mind you...
Also check out Spearfish South Dakota which is 1,100m asl and their large temperature rise and then fall again back in the 40's. Something like 50 degree change up and then 50 degree change down in the same day.
 

Donza

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Also check out Spearfish South Dakota which is 1,100m asl and their large temperature rise and then fall again back in the 40's. Something like 50 degree change up and then 50 degree change down in the same day.
I've been in Calgary during some gnarly temps
 

POW Hungry

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Yeah, you’d expect those leeward towns of the Rockies/mid-West to hold the crown.
Still at elevation, yet low enough to see foehn downsloping at the intersect of a large frontal boundary.
 

Hermon

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Incidentally, I thought I would go back and look at one of the biggest temp changes in Australia. Feb 1-2 2005 stands out for me.

Kerang went from 39.0c to 10c with a max temp on Feb 2 of just 11.7c! In the Alps, Mt Hotham Airport went from 27.0 to 5.1c. A bigger change occurred there Feb 8-9 2009 though (31.1 to 5.5c).
 
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Donza

Dogs body...
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Apr 21, 2004
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Yeah, you’d expect those leeward towns of the Rockies/mid-West to hold the crown.
Still at elevation, yet low enough to see foehn downsloping at the intersect of a large frontal boundary.
Thats why I was interested at 850hpa....

My research found Montana had one of the biggest temp swings in history.
The largest recorded temperature change in one place over a 24-hour period occurred on January 15, 1972 in Loma, Montana, when the temperature rose from −54 to 49 °F (−47.8 to 9.4 °C) .
 

Greysrigging

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I can remember visiting family ( down from Darwin ) in 1990.....45.8c at Tocumwal on the 3/1.... next day we drove down to friends place on Phillip Island, but stopped off and did the Puffing Billy train thingy on the way... was 37c at Bonnie Doon north of the Divide before noon, and 17c in the Dandenongs an hour south...
Then about 15c the next day in Cowes. Us Darwinites had SFA winter clothes, and the mates house ( newly built ) at Cowes had no heating.... was pretty grim...haha. Was too cold to do the Koala and Penguin stuff, let alone fish off the beach.... !
 

Hermon

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I can remember visiting family ( down from Darwin ) in 1990.....45.8c at Tocumwal on the 3/1.... next day we drove down to friends place on Phillip Island, but stopped off and did the Puffing Billy train thingy on the way... was 37c at Bonnie Doon north of the Divide before noon, and 17c in the Dandenongs an hour south...
Then about 15c the next day in Cowes. Us Darwinites had SFA winter clothes, and the mates house ( newly built ) at Cowes had no heating.... was pretty grim...haha. Was too cold to do the Koala and Penguin stuff, let alone fish off the beach.... !
Yep, I remember that day well. 42c in Bendigo, went to the One Day cricket at the MCG where the change had blown thru and we were shivering in the old Southern Stand next to a seriously out-of-control Bay 13. Merv Hughes was on fire that day....
 

Billy_Buttons

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Bordeaux hits back with balloons that turn hail into harmless rain

Adam Sage, Paris
Saturday February 06 2021, 12.01am GMT, The Times
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Saint-Émilion is home to some of Bordeaux’s finest appellations but it is prone to violent hail storms. Châteaux in the region have together bought a helium balloon and radar system, inset, which releases salt into clouds so hail falls as rain
ALAMY; AFP/GETTY IMAGES
The winemakers of Bordeaux have long been credited with an innate ability to hide their feelings behind a veneer of slightly aloof refinement. In recent years, though, it has become common to see them break down in tears in the spring and summer after losing their harvest to the hail storms that arrive with increasing regularity.

The vineyard owners of Saint-Émilion, the area that is home to some of Bordeaux’s finest appellations, have decided to fight back through the introduction of a €1.3 million high-tech plan to turn hail into rain by spraying salt into the clouds. The system, which uses a radar and helium balloons, is already being tested by individual vineyards and by wine and fruit growing bodies elsewhere, notably in the Rhône Valley, but it is a first for an entire area with a reputation like Saint-Émilion’s.

The “extremely precise” radar can detect and analyse an approaching storm 30 kilometres away and send a warning to winemakers’ mobile phones if there is a threat of hail, according to the Council of Saint-Émilion wines.

If the threat seems serious, the winemakers will use a smartphone app to activate 37 machines positioned across Saint-Émilion’s four appellations, which can each inflate and launch up to six helium balloons. The balloons are equipped with meters that automatically trigger the salt dispersal process once they are in the clouds, scattering 200 grams of hygroscopic salts, which lower the freezing point of water and help to transform the ice into rain — at least, if all goes to plan.

“It sounds simple in theory, but it took two years of trials to get to this point,” Franck Binard, the council’s general manager, said. The system was devel-oped for Saint-Émilion by Selerys, a firm specialising in storm risk solutions.


Mr Binard said that hail storms had always hit the region but had become a “real plague” in recent years because of global warming, becoming more frequent and violent. He said that at least a few of the area’s 900 vineyards were hit by hail almost every year and “we have all seen winegrowers cry because they have lost their harvest”.

The Bordeaux region is already equipped with anti-hail cannon that shoot silver iodide into the clouds in the hope that what falls from them will be slush rather than stones. However, the cannon belong to regional bodies that need at least 12 hours’ warning to get them into position.

Mr Binard said that some of the wealthiest châteaux had bought their own helium balloon systems but most could not afford the equipment. The council broke new ground by persuading vineyards to club together to pay for a system to cover the whole area, with the grands crus paying a bit more.

“The scientists say the system reduces the risk by between 60 and 100 per cent,” he added.



It is not foolproof, however, as fruit growers near Lyons, who are also testing the system, can testify. Their detection radar had broken down when a hail storm hit last summer and they lost apples, pears and peaches.

https://www.thetimes.co.uk/article/...s-that-turn-hail-into-harmless-rain-n9bqnv097
 

Billy_Buttons

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WEATHER EYE
Spinning ice circles are natural phenomena

Paul Simons
Saturday February 06 2021, 12.01am GMT, The Times
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An ice circle on the Taoer River in Mongolia
VCG/GETTY IMAGES
A large, perfect circle of ice was seen slowly spinning on a river in Finland by musician Maria Hanninen near Helsinki on January 9. “Amazing spinning large ice circle/disc on the River Vantaa,” she tweeted with a video clip. Another giant spinning ice circle was seen in December in Inner Mongolia on the Taoer River at Ulanhot city.

Reports of ice circles date back to 1895, when Scientific American mentioned the sighting of a circle of slowly revolving ice about 30ft across on a river in New York state. Since then, large ice circles have been seen up to about 200m (655ft) across and spinning very gently. At first sight they look too perfectly round to be natural, rather like the crop circles, which began to sprout up decades ago but were shown to be hoaxes. However, ice circles are a natural phenomenon and can appear in lakes and rivers in cold conditions.

One explanation is that the circles form in eddies (where water flows upstream against the current) of cold water, gradually increasing in size as they whirl around and collect more ice. But the ice spins around even when the water is totally still.

In 2016, scientists at the University of Liège investigated the phenomenon by putting miniature ice circles in a basin. To their amazement, the discs started spinning as the ice melted.

As the meltwater from the ice sank it went straight down underneath the ice and started spinning, creating a miniature whirlpool that made the ice above spin round. And the warmer the surrounding water, the faster the ice spun round.


That is because the warmer water created a larger difference in density between the ice and the surrounding water. And so in a river or lake, spinning water underneath a melting piece of ice can whirl it around, carving out its neat circular shape. And to get it started, if there is any gentle sideways movement, that can start the water spinning under the ice.

https://www.thetimes.co.uk/article/spinning-ice-circles-are-natural-phenomena-vhr3nnmhg
 
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