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KENNETH C. BRUNDIDGE

Abstract

Results are presented of determinations of the temperature structure and relative streamlines for eleven cold fronts as obtained from data collected on the 1420-ft. TV transmitting tower at Cedar Hill, Tex.

The temperature patterns were found to approximate the textbook case only when the frontal zones were strongly baroclinic and some instances of extreme overrunning were found when a pre-frontal nocturnal inversion existed. The relative flow patterns generally show a confluence of warm and cold air within the frontal zone, implying that the front cannot be treated as a substantial surface. Vertical turbulent mixing appears to be an important factor in the maintenance of the temperature structure.

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JOHN S. CORNETT and KENNETH C. BRUNDIDGE

Abstract

The power spectrum of the wind is estimated from independent wind measurements taken at an altitude of 1,500 ft above the ground in the frequency band from 0.0625 to 1.5 cycles hr–1. Wind data were obtained simultaneously from radar tracking equipment and from wind sensors on a nearby tower. These data were collected at 20-min intervals over a 5-day period.

Analyses of the wind spectra and coherence indicated a good correspondence in the two time series, considering that the data were obtained at slightly different locations and by completely independent measurements. It is concluded that radar wind-finding measurements can provide valid estimates of the wind spectrum in the frequency band analyzed.

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James R. Scoggins, Joe Arellano Jr., Bernard Esposito, G. Alan Johnson, and Kenneth C. Brundidge
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