Winter 2013-14 Thread — Northern Hemisphere (dewpoint, beach, cancel, humid)
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Fog and mist at 6PM 13C at O'Hare and 14C at Midway in Chicago....
ECWMF and GFS are both close on snowfall coming 8-10 days
Huge temperature range in Texas. 19F/-7C in the Panhandle and 91F/33C near the Rio Grande
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This upper air depiction early next week offers little doubt why this chill is to be so expansive. Ridging (northward buckling) of the jet stream over a dome of unseasonably mild air aloft over Alaska and eastern Russia drives a highly amplified ("wavy") jet stream pattern which includes a cross-polar jet with Siberian origins. This constitutes a "Siberian Express" pattern--always a source of Chicago's chilliest air masses! This upper air forecast if driven by the Weather Service's GFS model and is off the Weather Bell database.
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December is setting up to be a colder than normal month. The month is already running 13.3 deg colder than the opening days of Dec a year ago. Chicago temps since Nov 1 are running 4-deg behind a year ago.
This forecast off a month-long extension of the European Center's global model depicts colder than normal weather dominating a huge chunk of North America--even as warmer than normal temps are draped across Siberia and a good chunk of the hemisphere's polar region.
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Predicted and persistent ridging because of abnormal warmth aloft in Alaska and eastern Russia is clearly the model's basis for such a forecast.
Across the pond 900 mb level winds in 60-80 knot range w/explosive cyclone will impact Denmark, southern Scandinavia then Estonia
This weekend's snow won't be anything big, just enough to put down a good coating which will allow temps to fall big time next week when the second blast of Arctic air arrives
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Here's a definite sign of season. The crew of the U.S. Coast Guard's Chicago-bound Cutter Mackinaw, is shown collecting NOAA's northern Lake Michigan buoy, located off Washington Island at the tip of Wisconsin's Door Peninsula. The buoy will be returned to land for the winter and will go through any repairs that are needed before being re-deployed next spring and summer. The NOAA buoy and another like it which is positioned near mid-lake east of Kenosha, WI, are deployed each warm season and provide National Weather Service forecasters and others with critical, real-time reports of wave heights, air and water temps, winds, etc. out over the open lake.
U.S. Coast Guard public affairs Specialist Alan Haraf tells us the Cutter Mackinaw has 1,200 Christmas trees on board. The trees were picked up by the ship's crew at Cheboygan, MI. They are on their way to Navy Pier where organizations in the Chicago area will distribute them to families who might not otherwise have a chance to have a Christmas tree.
The stop to pick up the NOAA buoy is being carried out as the ship and its crew heads for Navy Pier here in Chicago.
Warnings
High Level - Rainbow Lake - Fort Vermilion - Mackenzie Hwy
4:15 PM MST Wednesday 04 December 2013
Wind chill warning for
High Level - Rainbow Lake - Fort Vermilion - Mackenzie Hwy issued
Wind chill colder than -40 Celsius tonight.
This is a warning that extreme wind chill conditions are imminent or occurring in these regions. Monitor weather conditions..listen for updated statements.
An Arctic airmass moving in from the Northwest Territories will allow the overnight temperature in High Level to be colder than minus 30 Celsius. With winds of 15 km/h wind chill values will be colder than minus 40. Wind chills will moderate as the temperature rises through the day on Thursday.
At these extreme wind chill values frostbite on exposed skin may occur in less than 10 minutes.
What's amazing (and I admit makes me happy since I'll be in Florida in a few weeks ) is that all those forecast maps show the cold never makes into Florida. By this Monday, many areas of the USA look really cold...but even north Florida seems to be normal to even above normal. I don't know what the normal December high is in places like Daytona Beach, but it has to be less than 80 F in early/mid December:
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take care Snowbound (and Woodrow
)
Better pray that one doesn't come to pass North America! 
) is that all those forecast maps show the cold never makes into Florida. By this Monday, many areas of the USA look really cold...but even north Florida seems to be normal to even above normal. I don't know what the normal December high is in places like Daytona Beach, but it has to be less than 80 F in early/mid December:
