After starting Wednesday morning off with very cold temperatures over much of the state, wind switched around to the southwest and rapid warming took place with sites like Estherville and Spencer warming more than 50 degrees for the day! The featured chart presents the largest twelve hour rises for Estherville based on available hourly data back to 1987. The second and tenth entries shown on this chart happened on Wednesday with the 3 AM temperature of -20 warming to 29 degrees at 3 PM and similarly for the 5 AM to 5 PM value. It is interesting to denote that the other largest warm-ups shown happened during May and October, during which dry air can help lead to rapid cooling at night and heating during the day.

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