UAVs can produce data for wheater forecast:
»Verification of meteorological data reports from unmanned aerial vehicles
»Weatherscout contract
»NASA Eyes UAVs, Microsats for Measuring Soil Moisture

UAVs must analyse and take into account wheater forecast:
»Long Range Evolution-based Path Planning for UAVs trough Realistic Weather Environments
»The Weather Research and Forecasting (WRF) Model