Updated Tuesday, Nov. 27 at 3 p.m.
Unalaskans should expect heavy snowfall Tuesday night.
The National Weather Service has issued a winter weather advisory for the eastern Aleutian Islands, including Unalaska and Nikolski.
In effect from midnight until Wednesday at 10 a.m., the advisory calls for four to eight inches of snow accumulation and "greatly reduced" visibility in the Unalaska area.
That snowfall forecast has increased since the morning weather report, which predicted 1.5 inches of "possible" accumulation by Wednesday night.
Forecasters expect the weather to cause travel difficulties, and the Unalaska Department of Public Safety has authorized the use of snow chains on local roads.
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Unalaskans should expect more snowfall Tuesday, following the community's first showers of the season on Monday.
The National Weather Service is calling for scattered snow showers throughout the day, with an inch of new accumulation possible at night.
Forecasters say snowfall is likely to continue Wednesday morning — possibly producing a half-inch of accumulation — before turning to rain on Wednesday night and Thursday.
Temperatures are also expected to increase slightly throughout the week.
While Tuesday's high is 37 degrees Fahrenheit, forecasters are calling for a 45-degree high by Friday.