Meteorological instruments provide surface measurements of atmospheric conditions at a given location. These instruments are used for weather forecasting as well as for hydrological studies. The PBO network contains a combination of Vaisala WTX510 and WTX520 instruments, which are low power devices with temperature, pressure, humidity, rain intensity, wind speed, and wind direction sensors. GPS and meteorological instruments are good candidates for collocation because GPS and meteorological data are easily integrated into one data stream. Most of the meterological instruments in the PBO network are configured for five minute sample rates with hourly downloads.