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Today's Top Weather Stories
On Weather & Climate Through the Eyes of Mark Vogan
A rescuer stands in Kinahrejo, a village hit by pyroclastic flows from Tuesday's eruption of Mount Merapi, Wednesday, Oct. 27, 2010. (Photo: AP Photo/Trisnadi)
latest news on indonesian volcano
Indonesia hit by earthquake and more volcanic ash
CNN
New Eruption at Indonesian Volcano Mount Merapi
CBS News
Merapi Volcano Threat Compounded by Seasonal Rain
AccuWeather News
latest news of tomas and it's threat to haiti
Tomas Flooding Is Primary Threat to Haitian Lives
AccuWeather News
Tomas to Regain Strength, Deliver Disastrous Blow to Haiti
AccuWeather News
other news today
Floods cause chaos in Thailand and Malaysia
BBC Weather
Water levels in parts of Hat Yai have exceeded 3m (10ft) (Image Courtesy of the BBC)
Today's Weather across America
From AccuWeather
Snow to Spread from Michigan to New York, North Carolina
By Heather Buchman, Meteorologist
Southern California Heat Ignites Fire Threat
AccuWeather
Discovery Delayed Again; Weather May Cause More Issues
By Kristina Pydynowski, Senior Meteorologist
Break in the Heat Coming for California, Southwest
AccuWeather
Weather Talk
By Mark Vogan
WINTER TAKING AIM AT CENTRAL AND EASTERN USA, RECORD WARMTH TO THE WEST
Big changes are now occuring in the large-scale North American pattern and this is right on queue with the further advancement of the season.
November is not only the month which sees the greatest temperature decline but also the month where many areas across the US, Canada and across the hemisphere as a whole see the weather become more winter-like rather than autumnal. Often, November brings the return to big winds, cold rains and the first snows of the season as well as the first hard frosts and freezes. Often by the close of the month, trees are bare.
After a very warm October, we are finally seeing the jet become more and more amplified and when this happens, we see extremes, flips in temperature and a turn to colder (in some areas), whilst other areas may actually see warming. This may well be the case for Canada and many areas of western North America, from the deserts of the American Southwest, all the way to the Arctic circle as the jet stream gets pushed all the way up to near Alaska and the Yukon, thanks to a huge ridge building over the western side of the continent.
WARMTH THAT REPLACES COLD, MUST GO SOMEWHERE, THAT SOMEWHERE IS THE GREAT LAKES, MIDWEST AND EASTERN US!
This ridge was very welcome yesterday over the western Plains where 60s and 70s rushed all the way north into the western Dakotas and Montana. The low 70s experienced over Montana yesterday brokes records. This happens basically every year at this time as the jet becomes stronger and more amplified as cold and the trough they rule becomes stronger and larger as the cold season advances. It's really only when strong ridges build up the western flank of the continent which ALWAYS brings unseasonal warmth way north where you can get that start to winter further east. Indeed, where that warmth surges north and replaces the cold that was there before, that air must then go go somewhere else (it doesn't just dissappear), and a pattern like this, all the Alaskan, Yukon and Northwest Territories cold gets transported south into the Lakes and Eastern US.
Because the jet cuts into a vastly contrasting temperature environment, pulling warmth into Arctic air, it's intensifies those upper-level winds, thus a 180mph jet diving into the US Midwest will be fast in getting that cold air from A to B... B being the base of the trough and that trough will deepen as the Arctic air fills it.... thus a shook to the system is coming for Easterners through this week and into next.
SIDE NOTE: The faster the jet blows SE, the quicker the air travels, the quicker the air travels the less modification is goes under and therefore this air, even though it's enetering a region that's got stronger sunlight and longer hours of daytime, will be colder becomes it has little time to heat up as it travels from the Yukon to Minnesota and down into the Southeast.
This in turn will send a large, deep trough into the central and eastern half of the continent, bringing not only colder air and cold winds from the Midwest all the way to New York City and the Eastern Seaboard but snow flakes. Snow flakes are likely to fly for the first time in cities such as Chicago, Cleveland, Detroit and it's possible the big I-95 corridor cities may see their first flakes of snow too. Hillier, mountains terrain of the Appalachains as well as upstate New York and New England may see a coating to a few inches through this weekend and next week with a much colder pattern as the air flow gets driven south from the Arctic. Multiple days in the 40s for Chicago will bring the coldest weather since March there and some areas are likely to see their chillest nights of the season over the next week.
Downwind areas of the Lakes may see substantial snows. I wouldn't be surprised to see 6-12 inches of snow in the worst hit areas, downwind of the Lakes over the next week or so.
UK Latest Weather
Thunder and Lightening accompanied my travels early this morning as I headed west along the A96 back into Inverness.
There's a lot of energy associated with these bands of squally weather that are periodically arriving one after the other aboard a strong upper-level support that's driving our weather. The epicentre of out weather is the low off the coast, but this is driving wave after wave of heavy rain and wind.
Another hefty band of rain moves in tonight and across much of Scotland bringing more nasty travel weather.
The country is devided by cooler air trapperd over the central and northern Highlands whilst the Lowlands and south is feeling milder Atlantic air. The bands of hefty weather is riding in between these two air masses and it's the Highland topography that's keeping both these air masses in place right now.
More wet, windy and unsettled weather will continue!
What's Reaching Today's Blogs?
From Record Low to Record High Pressure?
Jesse Ferrell, AccuWeather
Change Is the Order of the Day
Joe Lundburg, AccuWeather
Some Needed Rain, Tomas Still Struggling
Frank Strait, AccuWeather
Turning Colder with Snow Showers. Yep, Winter is Here.
Henry Margusity, AccuWeather
The Extremes of the Day
Today's US Extremes
Courtesy of AccuWeather
High: 102 degrees at Corona, CA
Low: 13 degrees at Berlin, NH
Today's UK Extremes
Courtesy of the Met Office
High: 63 degrees at Yeovilton
Low: 37 degrees at Loch Glascarnoch
Today's Extremes here at my house
High: 47 degrees
Low: 42 degrees
Thanks for reading.
-Mark
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