The NOAA National Weather Service (NWS) provides excellent weather data and radar imagery to the public. The below loop shows base reflectivity for the Hawai‘i Island. Base reflectivity is a display of echo intensity (reflectivity) measured in dBZ (decibels of Z, where Z represents the energy reflected back to the radar). "Reflectivity" is the amount of transmitted power returned to the radar receiver. Base Reflectivity images are available at several different elevation angles (tilts) of the antenna and are used to detect precipitation, evaluate storm structure, locate atmospheric boundaries and determine hail potential.