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PICTURE OF THE MONTH

Thunderstorm Outflows: Different Perspectives over Arid and Mesic Terrain

Sherwood B. Idso

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Sherwood B. Idso

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Sherwood B. Idso

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Calculations of the mean daily transmittance of the atmosphere for solar radiation based on only one independent variable, surface vapor pressure, are demonstrated to be equally as accurate for Phoenix, Ariz., as similar calculations averaged on a monthly basis over several years. A correlation coefficient of 0.92 is obtained for the linear regression of the calculated on the measured values, with a standard error of estimate of only 0.009.

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Sherwood B. Idso
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Sherwood B. Idso

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PICTURE OF THE MONTH

Vortex Look-Alikes: Juxtaposition of an Arizona Tornado and Dust Devil

Sherwood B. Idso

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Sherwood B. Idso

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Eighteen years of clear day solar radiation data accumulated at Phoenix, Ariz., are analyzed to yield monthly averages of the transmittance of the atmosphere for solar radiation. These figures serve as a basis against which theoretical calculations of the atmospheric transmittance are compared. Calculations based upon the complete set of attenuation relations proposed by Houghton average 2% lower than the measurements. When Houghton's water vapor absorption curve is replaced by the McDonald water vapor absorption relation, however, the yearly averages of the measurements and calculations are essentially identical. A procedure for approximating the effects of dust variability is introduced which further improves even these calculations in terms of monthly comparisons.

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Sherwood B. Idso and Blaine L. Blad

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Sherwood B. Idso and James W. Deardorff

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