U
UKMET
– United Kingdom forecast model.
UNSTABLE AIR
– air that rises easily and can form clouds and rain.
UPWELLING
– The rising of cold water from the deeper areas of the ocean to the surface. This phenomena often occurs along the California coast during the summer.
V
VEERING WINDS
– A clockwise change in wind direction. Veering winds with height are indicative of warm air advection (WAA).
VERY
WINDY
VIRGA
– Precipitation falling from the base of a cloud and evaporating before it reaches the ground.