UPDATE: Snow stops, but conditions expected to worsen tonight
11:20 a.m. Update
SIOUX FALLS, S.D. - The snow has tapered off in southwest Minnesota, but conditions are expected to worsen over much of the area tonight, the National Weather Service stated.
A strong upper level low pressure system will continue to move southeast across the northern plains this afternoon into Tuesday. Cold air with this system will be accompanied by areas of snow and gusty north to northwest winds.
For this afternoon and tonight, conditions will generally worsen from the northwest as snow and winds increase again over much of the area where they have dropped off. For later Tuesday and Tuesday night, the storm system will shift east of the area.
New snow amounts should vary from an inch or two along the Missouri and James river valleys to the 3 to 6 inch range from Marshall and Jackson to the Spirit Lake area of northwest Iowa.
The winter weather advisory remains in effect until 4 p.m. Tuesday.
Areas of blowing snow can be expected this afternoon, mainly in northwest Iowa, where winds will be strongest. Light snow will develop from the northwest by the end of the day and increase tonight. Winds and blowing snow will also increase tonight. Periods of snow will then continue into Tuesday.
Total snowfall accumulation will range from 3 to 6 inches, with the greatest accumulations in southwest Minnesota.
Wind and Visibility
Northwest to north winds will generally range from 10 to 20 miles per hour in southwest Minnesota and 15 to 30 miles per hour in northwest Iowa this afternoon. Winds of 20 to 30 miles per hour with higher gusts will become widespread tonight into Tuesday. This will result in reduced visibilities due to blowing snow.
Low visibilities will become widespread tonight. Because of the lighter winds in southwest Minnesota this afternoon, the greatest worsening of conditions tonight will be there.
The wind chill values will generally range from zero to 15 degrees below zero this afternoon through Tuesday.
A winter weather advisory for snow and blowing snow means that visibilities will be limited due to a combination of falling and blowing snow. Travelers are urged to be cautious, especially in open areas.
6:55 p.m. Sunday Update
SIOUX FALLS, S.D. - A winter weather advisory has been issued for all of southwest Minnesota and northwest Iowa, including Rock, Pipestone, Nobles, Murray, Jackson and Cottonwood counties in Minnesota and Osceola, O'Brien, Dickinson and Lyon counties in Iowa.
It replaces the winter storm watch some counties were previously under.
3:20 p.m. Sunday
SIOUX FALLS, S.D. - The National Weather Service has issued winter weather watches and winter weather advisories for much of southwest Minnesota and northwest Iowa, to begin at 6 p.m. tonight and end Tuesday afternoon.
A winter weather advisory has been issued for Rock and Pipestone counties in Minnesota and Lyon County in Iowa, and a winter storm watch has been issued for Nobles, Murray, Jackson and Cottonwood counties in Minnesota and Osceola, O'Brien and Dickinson counties in Iowa.
A cold low pressure system will drop southward tonight and then move slowly across the area through Tuesday. Temperatures will become sharply colder with windy conditions developing tonight and still remaining quite breezy on Monday, the National Weather Service warned.
The area for concern on the heaviest snowfall through Tuesday will be on a line from Marshall to Storm Lake, Iowa. Including today, these areas could receive 6 to 10 inches of snowfall through Tuesday. Elsewhere in the advisory area, 2 to 5 inches of snow will be common through Monday night.
As the wind increases tonight and Monday, areas of blowing snow will be a problem, possibly creating whiteout conditions at times in open areas. This is also due to the fact that accumulating snow has already been falling across the area for several days. The winds will decrease Monday night but accumulating snow will linger.
Snow is still likely on Tuesday from Marshall to Storm Lake.
Accumulating snow will be found across the area through Tuesday.
Widespread 6 to 10 inches of snow could occur through Tuesday.
Wind and Visibility
Wind will increase to 20 to 30 miles per hour after midnight tonight, and still be quite breezy at 15 to 25 miles per hour Monday with some higher gusts. This will create widespread visibilities of a half mile or less in the country. The wind will then decrease Monday night, before increasing again on Tuesday back to 20 to 30 miles per hour.
Wind chill values will generally range from zero to 15 below Monday through Tuesday.
A winter storm watch means there is a potential for significant snow accumulations that may impact travel, coupled with windy conditions reducing visibilities. Travelers should continue to monitor the latest forecasts.
A winter weather advisory for snow and blowing snow means that visibilities will be limited due to a combination of falling and blowing snow. Use caution when traveling, especially in open areas.