Objective Forecasting of Pan Evaporation -Two Contributions.

摘要

This memorandum consists of two articles on forecasting of pan evaporation. The first,An Aid to Agricultural Evaporation Forecasting,offers a linear equation which estimates 24-hour pan evaporation as a function of means of temperature,relative humidity,and 20-foot winds. Since these three variables are routinely forecast,application of this evaporation equation is fairly straight-forward. The second article,An Objective Method of Forecasting Total Open-Pan Evaporation for a 48Hour Period on the Texas South Plains,Using Some Parameters from the FOUS68Message,introduces an equation thought to produce meaningful forecasts of 48hour open-pan evaporation observed at the Texas A and M Research and Extension Center at Lubbock,Texas.