Advection Fog in New Hampshire

March 11, 2006

Pway_fog_in_january_warm_front copy

Provided and copyright by: Rob Sheridan
Summary authors & editors: Rob Sheridan

Fog forms when ground-level air is cooled below its dew point. This happens primarily as a result of advection, radiational cooling, orographic lifting, or evaporation. Advection (wind generated horizontal air movement) fog is observed when moist warm air moves over colder surfaces -- commonly observed when a warm front passes over frozen lakes, snow, or cold seawater. On the photo above, advection fog resulted when relatively warm air, associated with northeast moving cyclonic system, passed over a frozen lake in New Hampshire (picture taken in January of 2006).

Related Links: