Virga Dry Air Precip*

[http://www.usatoday.com/weather/wwater0.htm]

Dry air causes “invisible” rain

Rain or snow that evaporates as it falls into a layer of dry air near the earth’s surface is called virga. While virga can happen at any time during the year, it is most common during winter, when low-level air is very dry. As falling precipitation evaporates it moistens the dry air from the top down. If the precipitation lasts, the air becomes moist enough to block evaporation and the rain or snow reaches the ground.

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