Wednesday, December 15, 2010

15 December, 2010

Today's Top Weather Stories
On Weather & Climate Through the Eyes of Mark Vogan

FEELING LIKE -10 TO -15C ACROSS CENTRAL BELT TOMORROW, 1-2 INCHES OF SNOW AT BEST BETWEEN GLASGOW AND EDINBURGH.
The Central Belt of Scotland will have more in way of wind chill rather than snow to deal with tomorrow
Mark Vogan brings you his thoughts on upcoming Arctic blast
Part 1

Part 2
Mark Vogan discusses where the heaviest snow will hit but shares concern over low windchills as temperatures struggle to reach freezing and strong north winds howl.

Today's Weather across America
From AccuWeather


Odds increase for weekend I-95 snowstorm
By Alex Sosnowski, Expert Senior Meteorologist

Snow from Fargo to Cincinnatti, Washington/Baltimore
By Alex Sosnowski, Expert Senior Meteorologist




Lake-Effect snow piling up around the Great Lakes
By Kristina Pydynowski, Senior Meteorologist

Weather Talk
By Mark Vogan

Atlantic air floods Scotland with rain falling and temps around 40 degrees as of 9pm ahead of what will be the arrival of brutal Arctic air, likely to bring a severe final third to December!

As of 9pm this evening, it's raining and the snowpack in now dwindling to a point where we're now under an inch left, however that snow is frozen solid thanks to the past couple of weeks of sustained low temperatures and yes, the Atlantic warmth is being transported in thanks to the presense of an Arctic cold front that's trying to cross the North coast of Scotland and will work it's way south throughout tonight.

It's likely that as tonight wears on, winds will begin to transition to a more northwest, rather than west or southwest direction and therefore as well as temperatures beginning to drop from around 40 back towards freezing, rains that will fall off and on all night, will turn to sleet and finally snow with heaviest snowfall over the higher ground. Moisture diving south along with the fresh push of "very harsh Arctic air" will be wrung out over the higher terrain which makes up the northern, central and southern Highlands, therefore making for much less accummulation over the heart of the populated central lowlands.

I expect at most 2 inches of accummulation over lowlying areas of the central belt and at most 2 or perhaps 3 inches over higher groung within the central belt. Areas from say Perth and Kinross northward, may see areas exposed to moisture and the northerly flow, may see upwards of 4-6 inches.

Powerful north to northwest winds will effect the north and central part of Scotland and with temperatures remaining below freezing once that cold front pushes through, it's going to be windchill of biting severity with -15 to -20C across the higher ground where gale-force winds will create the harshest of conditions.

Central Belt areas will struggle to top -1C and factor in even a gusty 20mph wind and it's going to feel very cold indeed, likely between -10 and -15C throughout tonight. Blowing and drifting will be a major factor over the Highlands, whilst windchills will likely be the major factor for us here in the Central Belt. With a colder air flow, any snow that does fall and accummulate will likely be powdery and thus some blowing is possible.

What's Reaching Today's Blogs?

North Carolina Frigid, Kentucky Below Zero
Jesse Ferrell, AccuWeather

Morning Lows
Frank Strait, AccuWeather

The Weekend Storm Threat
Joe Lundburg, AccuWeather

The Extremes of the Day

Today's US Extremes
Courtesy of AccuWeather

High: 87 degrees at Vernon, TX
Low: -34 degrees at Babbitt, MN

Today's UK Extremes
Courtesy of the Met Office

High: 50 degrees (9.9C) at Kinlochewe (northwest Highlands)
Cold High: 37 degrees (2.9C) at Spadeadam (Cumbria)
Low: 21 degrees (-5.9C) at Strathallan (Perthshire)

Today's Extremes here at my house

High: 44 degrees (all day it remained around 32 degrees but warmed considerably between 9pm and 12am)
Low: 22 degrees

TODAY'S CONDITIONS
Snowcover: 1 inch
Today saw another day of highs hover around the freezing mark and skies mostly cloudy after a clear overnight sky, light winds and temperatures which dropped off to 22 degrees by sunrise this morning. However changes occured later this evening as light rain began falling after temps rose markedly from 31 degrees to 39 degrees as warmth arrived. This marks the presense of the Arctic air starting to alter the air flow over Britain. By tomorrow, high's may struggle to reach 32, N, NW winds blowing at 10-20 and windchills of -10C or lower!

Thanks for reading.
-Mark

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