Our surface-meteorology instruments measure a variety of quantities near the earth's surface. The most standardized and commonly deployed
instruments monitor meteorolgical state variables, such as mean pressure, temerature, moisture, wind, and radiation. For hydrological
applications, instruments are also deployed to measure the amount, type, and size distribution of rain and snow, as well as the heat and
water content of the soil. Also, the latest advancements in GPS technology have allowed for estimates of vertically-integrated atmospheric
water vapor to be derived from a single surface-based reciever. Lastly, instruments that measure atmospheric turbulence are occassionally
used to monitor the flux of heat, momentum, and moisture between the atmosphere and the earth's surface.