A winter storm will affect the area on Thanksgiving day. A cold front will continue to move south of the region tonight. This will allow colder air to undercut significantly warmer air aloft. Rain is expected to develop tonight, but changing to freezing rain Thursday as the colder air deepens at the surface. The freezing rain will then mix with or change to sleet before ending as a period of light snow Thursday evening. Ice accumulations of one tenth to one quarter of an inch will be possible, with an inch or two of sleet and snow combined. Travel may become difficult through the day Thursday. Combined with northerly winds at 5 to 30mph, icing on power lines could lead to a few power outages.
Because of this, a winter storm warning for freezing rain, sleet and snow will be in effect from 9am to 9pm Thursday. A winter storm warning means significant amounts of snow, sleet and ice are expected or occurring. Strong winds are also possible. This will make travel very hazardous or impossible.
A winter weather advisory is also in effect from 4am to 6pm Thursday. Areas of drizzle are expected to develop early Thursday morning before transitioning over to freezing rain and sleet. Thereafter, the precipitation is expected to mix with and change over to snow before ending early evening. Ice accumulations of up to a tenth of an inch are expected through the morning hours, with an additional one to two inches of snow expected Thursday afternoon. Visibility may be reduced below one mile at times through the afternoon hours in falling snow.
A winter storm watch will also remain in effect for portions of southwest Iowa from Thursday evening through late Thursday night. This is where rain will begin to change to freezing rain early Thursday evening before changing to light freezing drizzle or light snow Thursday night. Ice accumulations of 0.1″ to 0.2″ are possible. Up to a dusting of snow is also anticipated.
Continue to stay with the Iowa Storm Chasing Network as we will have all the latest travel updates to keep you ahead of the storm.