A storm system currently interacting with arctic air dropping out of Western Canada is helping bring a decent snow to parts of Montana, Idaho, Wyoming into the Northern Plains after bringing the first real snow to both Edmonton and Calgary the day before. Clear skies and with snow on the ground is certainly making for a cold night here with lows dipping into single digits tonight.
Here’s the current surface chart and you can see the arctic high to the north and storm system to the south with an east flow helping enhance upslope snow over Montana tonight. Where skies are clear and they are in the western half of Big Sky Country, some place could get close to 0 degrees.
Here’s the latest snow chart off the GFS through the next 48 hours.
Notice the swath extending east through parts of the Dakotas towards the Great Lakes.
The never gets much further south than Montana and spreads out across the Northern Tier but as the system pushes east and up into the Great Lakes, the low deepens considerably and looks set to bring stormy weather to the Lakes with heavy thunderstorms, flooding rains blast the Mississippi and Ohio Valleys.
Here’s the surface chart off the GFS by Thursday and note the pressure drops to 988 as the center crosses Lake Superior. Note the heavy rains pushing east through Arkansas and Louisiana.
By 90 hours or Friday, the storm pushes up into Labrador with the trailing front swinging a band of heavy rain through the East.
By 120 hours the trough drops down over the Lakes with pretty cold air for a time on the backside.
The chill drops into the Lakes Saturday.
And Northeast Sunday.
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By early next week the next system pushes into the Pacific Northwest while pressures are high and so conditions should be fairly quiet across much of the country but notice the tongue of precip pushing into the Southwest up into the Central Plains, perhaps a tropical system in the east Pacific pumping moisture NNE.
Despite the strongly +AO, another decent shot of cold drops into the Western US early and mid next week on the backside of the next system.
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