A decaying area of thunderstorms produced a small heat burst over small portions of Eastern Iowa Monday morning. The featured chart is a 1 minute time series of AWOS observations from the Monticello airport. You can see the classic coupled rise of temperature with drop of dew point with an increased wind speed. Sometimes these events can lead to very rapid warming (enough to damage some plants).

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Tags:   heatburst  

The featured time trace is taken from one of the KELO-TV WeatherNet stations in Sioux Falls on Sunday morning. The rapid and temporary rise in temperature and drop in dew point is a classic signature. These events are often caused by rapidly decaying thunderstorms producing a downward rush of air that warms as the pressure increases. This air hits the ground and spreads out over a limited area producing high winds with hot and dry conditions.

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Tags:   heatburst  

A powerfull supercell [3] brought very large hail, strong winds and a brief tornado to Iowa last night. A very distinct pressure couplet [2] can be seen at Coon Rapids when this supercell pasted. Figure [1] shows evidence that a heat burst occured this morning in Iowa.

Tags:   heatburst   meso