As of today, the major storm system is forecast to really impact Iowa’s weather on Tuesday, not Monday. This of course can change with time...the storm is still ~3k miles away from Iowa.
https://weather.com/weather/5day/l/USIA0414:1:US
http://www.accuweather.com/en/us/iowa-city-ia/52240/daily-weather-forecast/328802
That’s what I was going to say. Perhaps flurries on Monday night, but real snow in the current forecast (1) hits after the caucuses are over, and (2) would upset delicate liberals but would not affect most conservatives I know from Iowa.