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An examination of a downburst and two microbursts in the eastern plains with a very warm mid-level environment
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1990
[PDF-3.78 MB]
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Description:It has long been suggested that in the eastern part of the Great Plains the chances for thunderstorms become small with a 700 mb temperature greater than +10°C. It has also been suggested that the areas of thunderstorms often occur on the cool side of the 700 mb +10°C isotherm (Fig. 1). Since generated 700 mb temperature forecasts are not available, a field forecaster relies on 576 meter 1000-500 mb thickness line which closely corresponds to the 700 mb +10°C isotherm (Fig. 2). Schaefer (1986) mentions this rule and also notes that in forecasting nocturnal Mesoscale Convective Complex (MCC) events that a 700 mb temperature greater than +12°C suppresses organized convection. This 700 mb isotherm rule of thumb for the Eastern Plains would not have the same application in the Western Plains due to the higher surface elevations.
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Rights Information:Public domain
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