We are now a little over 24 hours away from our next winter storm and some things still remain unclear. Here is the latest:
What We Know:
Winter storm watches are in effect for the northwest half of Iowa. A messy mix of freezing rain, sleet and snow is expected to move into southwestern Iowa late Sunday evening. This mixture may produce some light ice accumulations of less than .10 of an inch. This area of precipitation will move north/northeast across the state from Sunday night through Monday night.
Southeastern Iowa (south and east of Des Moines) looks to start out as a mix Sunday night, then transition to all rain on Monday as temperatures warm in to middle 30s, to near 40 degress far southeast. Central Iowa looks to stay as a mixture into Monday morning, possibly changing to rain for a time in the afternoon before changing to all snow late Monday afternoon and evening with at least a few inches of snow possible. Northwest Iowa looks to say all snow during this event, and this is where the highest snowfall totals will be found, possibly over a half foot.
Questions to be Answered:
Even though this storm system will start to affect the area Sunday night, there still remains some uncertainty regarding the final storm track. As of right now the NAM model shows the storm tracking right over the central part of the state, but the NAM/WRF model has the storm system a bit more southeast. This more southeast track would push the heaviest snow bands slightly more southeast affecting portions of central Iowa. The latest GFS model also has the storm tracking over central Iowa placing the heavier snow totals over northern and northwest Iowa. These little differences in the track will make a big difference on the amount of ice, snow, and rain you will see. If you plan on traveling Sunday night through early Tuesday be sure to stay with ISCN for the latest information on this next winter storm.