How does doppler radar work?

Moderate Winter Storm remains on track to impact the Sierra today through Saturday. Expect winter driving conditions today over Sierra passes spreading into the Tahoe Basin tonight. For more detailed timing and impacts check out the Winter Weather Advisory for the Sierra - http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=rev&wwa=winter weather advisory | US National Weather Service Reno Nevada

1-5 PM RADAR LOOP: There is widespread rain from the Oklahoma panhandle to Wisconsin with developing strong to severe storms from Kansas City to the Gulf Coast, follow weather.gov for the latest forecast, watches and warnings this evening. | U.S. National Weather Service (NWS)

1K views · 34 reactions | Local radar this morning shows rain moving into parts of the area with a cold front moving across Long Island and Southern CT. Much of the rain is occurring behind the cold front with observations indicating winds from more of a north direction. Rain increases across the area later today. | US National Weather Service New York NY | Facebook