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Cold air set in but warmer air set to move in from South

(KTUU)
Published: Dec. 5, 2019 at 11:04 AM AKST
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While under mostly cloudy skies Thursday Anchorage will see a high near 20 degrees.

Fog is a concern this morning for portions of the Copper River Basin and the northern half of Cook Inlet, including Knik and Turnagain Arms. Fog that persisted over Palmer yesterday (Wednesday) should continue to build and expand in coverage into Thursday morning possibly into Anchorage as the high-pressure ridge over the Interior continues to build.

This will make low temperature prediction a little tricky in these locations as any fog development will moderate the downward trend in temperatures. On Thursday night, a front lifting north from Kodiak Island and the western Gulf will move toward coastal Southcentral.

This will bring an increase in airflow out of the south thus increasing gap winds out of the south through the mountains. Even with this push of warmer air out of the south, it should remain cold enough at the surface as well as the upper levels of the atmosphere for the precipitation to stay as snow, with light accumulations likely from the western Kenai Peninsula north across the Susitna Valley through Friday.

For the extended forecast, it still looks promising that storms and airflow out of the south will bring considerable warming over the weekend for Southcentral Alaska. These conditions look to persist into early next week. The ridge of high pressure looking to quickly form on Saturday along the Alaska Canada Border and push all the way north into the Arctic will assist in pulling warmer air up out of the south.

The storms moving up out of the south will bring precipitation to coastal areas as well as elevating winds. Snow and rain totals are undetermined at this point but the warm up could threaten our snowpack over the weekend in Southcentral. Out west, low-pressure storms are expected to be present over the entire area as they spin and move for the duration of the forecast period from the Western Bering to the Central Aleutians.

Early patchy freezing fog Thursday in Anchorage with single-digit temps warming to 20 degrees. Thursday night we drop down to 17 degrees with a 50% chance of snow in the evening with snow more likely after Midnight in the 1" range.

It will be cloudy Friday in Anchorage with a 50% chance of early snow accumulating to near 1" with a high near 28 degrees. Friday night we drop down to 21 degrees while under mostly cloudy skies and a chance of snow.

Looking ahead, Saturday we will be cloudy with a 50% chance of snow while we warm up to 34 degrees as winds blow out of the east from 10-15 mph.

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