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  • Author or Editor: Robert W. Lenhard x
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Robert W. Lenhard Jr.

The relationship between the weight of glaze on power lines and common meteorological variables is examined. The icing data used are those collected by the Pennsylvania Electric Association; the meteorological data are those available in third-order climatological station records. A graphical correlation between ice weight, daily precipitation total and a derived temperature variable is obtained. In addition, the regression of ice weight on daily precipitation is explored and the probability of occurrence of daily maximum and minimum temperatures associated with glaze storms is given. These two relations are suggested as alternative estimating tools.

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Robert W. Lenhard

Paired, simultaneous, AN/GMD-1 radiosonde flights released 10 to 12 miles apart show smaller differences in heights of pressure surfaces than would occur if previous estimates of radiosonde error are accepted. The radiosonde system apparently delivers temperature information accurate to 0.3C (RMS error), exclusive of the solar radiation and response time errors of the thermistor. A table of errors for computed values of height and density at specified pressure, and of pressure at specified height is presented, based on this temperature accuracy.

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Captain Robert W. Lenhard Jr. and T/Sgt John M. Foard

A method is presented for determining the probability of occurrence of all combinations of crosswind and runway wind components at an airport. It is applied to Prestwick, Scotland for the existing instrument runway and for winds occurring with ceilings less than 1000 ft and/or visibilities less than three miles.

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