Snow is forecast to develop and spread into southwest Iowa late tonight and continue to spread northward past midnight. The heaviest snow is likely to fall during the overnight hours into the mid morning hours Tuesday from southwest Iowa to central and northern Iowa. The strongest winds are expected to develop around sunrise Tuesday morning and increase throughout the day out of the northeast, then shift north by Tuesday evening. The heavy snow is anticipated to become light to locally moderate by Tuesday evening. However, with the north winds of 25 to 30-mph, and gusts to over 40-mph expected with the falling snow, white out conditions will occur through much of the day Tuesday into Tuesday night in the blizzard warning. There will be a sharp cutoff from the rain/snow line in south-central to southeast Iowa, where northwest sections of counties may exceed several inches of snow and the southeast sections receiving very little.
A blizzard warning is in effect from midnight tonight to 6am Wednesday. Snow will spread across southwest Iowa late tonight and blossom over the area during the overnight hours through the late morning Tuesday. A period of very heavy snow is expected to occur during the Tuesday morning commute with snowfall rates of 1 to 2 inches per hour. The strongest winds are then to develop late Tuesday morning into the evening.
Accumulations of 8 to 12 inches with isolated higher amounts will be possible. Northeast winds becoming north at 25 to 35-mph with gusts in excess of 40-mph will be likely. Visibilities will drop to below one quarter mile with without conditions likely to occur.
A winter storm warning will be in effect from midnight Monday to 6am Wednesday. Snowfall accumulations of 6 to 10 inches are expected with higher amounts near 12 inches possible further north. Northeast winds becoming north at 25 to 35-mph with gusts in excess of 40-mph will be possible. Visibilities below a half mile to even near whiteout conditions are possible. This will create extremely hazardous travel to nearly impossible at times. Please reconsider any travel plans.
A winter weather advisory will be in effect from 3am Tuesday to 6am Wednesday. Snowfall accumulations of 3 to 6 inches are expected with locally higher amounts further northwest. Northeast winds becoming north at 25 to 30-mph with gusts in excess of 40-mph at times will be possible. Visibilities will be around one half mile at times of the heavy snowfall or strong winds. Hazardous travel conditions will develop. Please reconsider any travel plans.