4/10 - 4/11 Winter Storm (Update #1)

This mornings' model runs were completed a couple of hours ago and an interesting trend has taken place. Nearly every model runs went with a slightly strong low pressure system, thus heavier precipitation & nearly every model slid the cold air and system overall just a bit south. The heaviest snowfall is still expected across northern Iowa, as well as southern MN/eastern SD and further along the WI/IL border. This area has the potential for some very heavy periods of snow as well as significant accumulations by the end of tomorrow afternoon. Currently, Snow Advisories and Winter Storm Watches have been issued for the northern third of the state with the potential of 6-10 inches of snowfall within the next 30 hours. This mornings' models are within this range, although some slightly higher in localized areas and others are slightly weaker with the snowfall amounts.

With the southern trend for this system however, this means that the central third of the state will likely have more snowfall potential. A line from Sioux City to the Quad Cities is likely to be the main line of accumulating snowfall. Just south of this line, some snowfall overnight and tomorrow may be seen, although less than an inch of accumulation is expected. Other areas in between those mentioned above will see 2-5 inches of snowfall mainly during the day tomorrow.

Next update expected late tonight with updated forecast and snowfall amounts received.