Why does weather radar not report some precipitation? Not sure this is the right place for this, but how come I look at the radar sometimes and, despite it clearly raining at my present location, it doesn't show any precipitation? Example is right now at KEWR, it's raining. I can verify that by standing outside. But looking at the radar from several sources (NOAA, weather.com, several iPhone apps) there is nothing on it.

I know about the whole tilt thing but KEWR has a terminal radar quite close as I recall most airports do.
The National Weather Service's 148 WSR-88D Doppler radars can detect most precipitation within approximately 90 mi of the radar, and intense rain or snow within approximately 155 mi. However, light rain, light snow, or drizzle from shallow cloud weather systems are not necessarily detected.—wunderground


As Ron Beyer commented, the METAR KEWR 010251Z 03012KT 5SM -DZ BR BKN007 OVC012 14/13 A3025 RMK AO2 SLP243 P0000 60002 T01390133 58001 shows light drizzle.