The long advertised snow storm for Thursday is finally at hand. Snow will get going this afternoon and last into Friday. The featured chart presents the air temperature timeseries for Des Moines for the ten most recent daily snowfall totals over six inches. Based on temperature and hourly precipitation, a crude estimate is made of when the snowfall started to normalize the chart. The chart nicely illustrates how temperatures are generally steady during the snowfall event, with warmer temperatures before and colder temperatures after. Temperatures are also generally in the 20-30 degree range with the noticeable anomaly being an event from Feb 2009, when we had once of the largest snowfall events at a temperature near zero degrees. For this event, temperatures will be steady in the mid 20s, but not much in the way of colder air behind the system.

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Tags:   snow