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One-two Punch of Cold Air, Precipitation and Lake Effect Snow. Also, the coldest air of the season.


A cold front stretches across the eastern Great Lakes across the Ohio Valley, into the Tennessee Valley, and into Mississippi and Alabama with showers advancing eastward along the cold front. Snow is developing along the backside of the low with lake effect snow beginning across the UP of Michigan as winds shift behind the low and cold air funnels on in. Wet conditions return after a bit of relief across the Pacific Northwest today with mountain snow conditions in the Cascades, the Olympic Mountains, and parts of the northern Rockies.

An area of low pressure is located over the southern Hudson Bay. A cold front is sliding to the southwest from the eastern Great Lakes through the Ohio/Tennessee Valley and into the southern Gulf Coast. Cold air is funneling in behind the front with an area of high-pressure building in the Central Plain. A tight pressure gradient is still being observed across parts of the northern Great Lakes and Midwest, indicating we still have some gusty winds across the region today. We are also seeing compacting isobars along the Appalachian Mountains and across Texas, where winds are gusting today. However, these winds are not strong like what we have been seeing over the past couple of days in the northern Plains, where winds were gusting from 60-90mph across some areas of Montana, and the Dakotas. Due to the weaker winds being observed across the region today, we are not seeing any winds advisories or warnings are issued across the lower 48.

Temperatures this morning were rather cool across much of the lower 48 with temperatures in the teens across parts of Montana, into the Dakotas, and into Wyoming and Colorado with many locations below 30°. Much of the warmer air was observed along the east coast in the Mid-Atlantic, across the Southeast, and along the Gulf Coast.

Winter Weather Advisories and Winter Storm Watches in effect across portions of the Pacific Northwest and across the Great Lakes for both mountain snow conditions along with Lake Effect snow.


Pacific Northwest:

...FIRST SNOW OF THE SEASON EXPECTED FOR MANY TOWNS LATE THIS

AFTERNOON INTO FRIDAY MORNING...

...WINTER WEATHER ADVISORY IN EFFECT FROM 4 PM THIS AFTERNOON TO 10

AM PST FRIDAY...

* WHAT...Wet snow expected. Total snow accumulations 1 to 3 inches

with highest amounts above 2000 feet. Local accumulation up to 4

inches possible on the West Plains between Airway Heights and

Davenport. Snow may mix with rain at times below 2000 feet.

* WHERE...Rockford, Spokane Valley, Worley, Coeur d`Alene, Cheney,

Fairfield, Hayden, Post Falls, Airway Heights, Downtown Spokane,

and Davenport.

* WHEN...From 4 PM this afternoon to 10 AM PST Friday.

* IMPACTS...Plan on slippery road conditions. The hazardous

conditions could impact the Friday morning commute


UP of Michigan

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 7 PM EST THIS

EVENING...

* WHAT...Lake effect and blowing snow. Additional snow

accumulations of 2 to 4 inches with locally higher amounts in

the higher terrain. Winds gusting as high as 40 mph will cause

reduced visibilities to below one mile at times in areas of

blowing snow.

* WHERE...Ontonagon and Northern Houghton Counties.

* WHEN...Until 7 PM EST this evening.

* IMPACTS...Plan on slippery road conditions. Patchy blowing snow

could significantly reduce visibility. The hazardous conditions

could impact the Thursday morning and evening commutes


Lake Erie:

...WINTER STORM WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH

FRIDAY MORNING...

* WHAT...Heavy lake effect snow possible. Total snow

accumulations of 4 to 7 inches possible.

* WHERE...In Pennsylvania, Southern Erie and Crawford counties.

In Ohio, Geauga and Ashtabula Inland counties.

* WHEN...From this evening through Friday morning. The period of

heaviest snow will be between midnight and 7 AM Friday morning.

* IMPACTS...Travel could be very difficult. The hazardous

conditions could impact the morning commute.

* ADDITIONAL DETAILS...Temperatures will drop into the upper 20s

and lower 30s and will likely cause road surfaces; especially

bridges and overpasses to cool enough to allow snow to

accumulate.


...WINTER WEATHER ADVISORY IN EFFECT FROM 9 PM THIS EVENING TO

1 PM EST FRIDAY...

* WHAT...Lake effect snow expected. Total snow accumulations of

generally 2 to 3 inches, though locally between 4 and 7 inches

will fall within more persistent Lake Effect snow bands,

especially across the northwest half of Warren County.

* WHERE...Warren and McKean Counties.

* WHEN...From 9 PM this evening to 1 PM EST Friday.

* IMPACTS...Plan on snow-covered and slippery road conditions,

along with locally very poor visibility within the heavier snow

bands. The hazardous conditions could impact the Friday morning

commute to work and school.

* ADDITIONAL DETAILS...Conditions can change very rapidly in lake

effect snow bands. As you encounter these snow bands, ensure

you gradually slow down and greatly increase your braking

distance between you and the vehicles ahead. Use your hazard

lights to increase the visibility of your vehicle to other

drivers to help avoid accidents.


Lake Ontario:

...WINTER WEATHER ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO

11 AM EST FRIDAY...

* WHAT...Lake effect snow expected. Total snow accumulations of

3 to 6 inches.

* WHERE...Northern Oneida county.

* WHEN...From 11 PM this evening to 11 AM EST Friday.

* IMPACTS...Plan on slippery road conditions. The hazardous

conditions could impact the Friday morning commute.

* ADDITIONAL DETAILS...Snowfall rates as high as 1 to 2 inches per

hour are possible and may cause snow to accumulate quickly on

the roads and also reduce visibility to less than a half mile at

times in the Advisory area.

FUTURECAST Radar shows lake effect snow developing along the Great Lakes

An upper-level trough is digging southward across the Northern Plains into the Great Lakes pushing eastward into the northeast. A weak ridge will develop behind the trough axis allowing for a brief period of relief and warm air back of the central portion of the lower 48. Cool air will funnel in behind the front while warm conditions are observed this morning ahead of the front. At the end of the low, you can see the cool air loaded across the Pacific Northwest ready to intrude its way across the eastern half of the lower 48.

As a deeper more pronounced system moves in behind bringing some of the coolest air of the season to much of the United States where some places will see temperatures 10-30° below normal the week of Thanksgiving.

LONG RANGE ECMWF FORECAST LOOP









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