After a very cold stretch of weather, temperatures warmed nicely on Tuesday into the 30s and are expected to reach the 40s for much of Iowa on Wednesday. Today's high is expected to be ten degrees warmer for Des Moines than the warmest high over the past thirteen days. The featured chart presents the largest increase in daily high temperature for a day vs the maximum over the previous thirteen days. The largest change shown occurred on 14 Feb 1899 with a high of 47 after a previous thirteen day high of 17. The chart shows a clear annual signal as these types of events are favored in the late spring as warm air mass surges replace persistent cold air masses probably associated with a snow pack.

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Tags:   highs