A mixture of snow and freezing rain will develop over southern Iowa early Monday morning. The precipitation will spread north during the morning hours Monday and persists through the rest of the day. The greatest threat for freezing rain will be across southeast Iowa while the greatest threat for heavy snow will be over western and northern Iowa, with a wintry mix into central Iowa.
A winter storm warning will be in effect from 3am Monday to 6am Tuesday. Snow will spread up into central Iowa early to mid morning on Monday and persist throughout the day and into the overnight hours on Monday. A mix of snow and freezing rain is expected east of interstate 35 and south of highway 20 during the late morning and early afternoon before transitioning to snow. The heaviest snow is expected from the late morning through the late afternoon with rates of one to two inches an hour possible.
Total snow amounts will vary between 8 and 12 inches in the north and west, with 4 to 7 inches expected from south central to northeast Iowa. Across southeast Iowa where sleet and ice will be likely early on, snowfall amounts will range from 1 to 3 inches. The snow will be a wet heavy snow, which will lead to some concern. This could down power lines and tree limbs.
Total ice accumulations will range from a tenth to four tenths of an inch east of interstate 35. The highest ice accumulations will stretch from Ottumwa, Quad Cities back through Burlington, and this is where ice accumulations of two tenths of an inch to as much as a four tenths of an inch will be possible.
Winds will increase out of the east to northeast Monday morning and reach sustained speeds of 25-mph to 30-mph with gusts over 40-mph. Blowing snow conditions are likely and may reduce visibility down to one quarter mile at times. Large drifts will be created due to the strong winds.
Hazardous travel conditions are anticipated Monday. The combination of freezing rain and snow will make roads very slick and dangerous. The strong winds may lead to localized power outages where snow and ice build up on trees and power lines.
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.