Rain/Snow Possible Later This Week

Our first January thaw. The last two days have been quiet with afternoon highs in the mid and upper 30s. These kind of highs are expected through Wednesday and potentially Thursday in the morning before temperatures drop with a gusty north wind.

The latest surface map shows a low pressure system off the west coast. This is the storm forecast to bring the chance of rain/snow to the Midwest.

The low pressure is forecast to move into western Kansas by Wednesday evening. The map below shows the position of the low pressure systems and associated cold fronts at that time. This is all forecast to move east with a chance for rain Wednesday night and Thursday morning in eastern Iowa.

The chart below shows the forecast wind speed and direction Wednesday night and Thursday. The high temperatures Thursday will occur in the morning. The wind shift to the northwest is about 5 in the morning. This chart is for Waterloo. The wind shifts to the northwest a couple hours later east in Dubuque. Temperatures will begin to drop and transition rain to snow late Thursday morning into early afternoon.

There is still some uncertainty as to when the rain changes to snow, where and how much snow will accumulate. The map below shows the best chance of snow in northwest Iowa with less of a chance farther southeast.

Here is where the most moisture from this storm will fall Wednesday evening to Thursday evening. There is a possible dry slot across eastern Iowa. This will cut back on the amount of moisture for either rain/snow.

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Posted under Update, Winter Weather

This post was written by Schnack on January 8, 2018

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