Comparison of precipitation gage catches with a modified alter and a rigid alter type windshield

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Abstract
Gage catch from two standard weighing recording rain gages (Belfort model 5‐780), one with a modified Alter windshield and one with a rigid Alter type windshield, were compared for 89 storms with wind speeds ranging from 4 to 32 mph (6.4 to 51.5 km/h) and temperatures ranging from 14° to 69°F (−10° to 21°C). The differences between gage catches were statistically significant at the 1% level for wind speeds of 12 to 16 mph (19.3 to 25.7 km/h) and for temperatures of 23°F (−5°C) or less. Since on the average the windshields do not produce significantly different catches, either windshield can be used to compute actual precipitation by using the Hamon dual gage approach.

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