Fog And Stratus - Weather Events

by FMI

Parameter Description

Precipitation

Shallow stratus (radiation fog): generally no precipitation.
Stratus with larger vertical extent (especially advection fog): drizzle, in winter light snowfall or super cooled drizzle.

Temperature

St/Fog covered areas in winter generally warmer, in summer cooler than adjacent cloud-free areas.
Reduced diurnal variation of temperature within cloudy areas.

Wind (incl. gusts)

For Radiation Fog light or calm wind conditions, for Advection Fog moderate, even slightly gusty winds.

Other relevant information

Visibility in Fog below 1000 m. Fluctuations in visibility, when cloud base temporarily lifted or lowered.
Icing possible within the super cooled cloud conditions. The most probable location for icing near the cloud top, where droplet size is the largest.

	09 November 2005/12.00 UTC - Meteosat 8 IR 10.8 image; weather events (green: precipitation, yellow: fog/mist/haze)

Menu Of Fog And Stratus

Typical Appearance In Vertical Cross Sections

References

Parameter	Description
Precipitation	Shallow stratus (radiation fog): generally no precipitation. Stratus with larger vertical extent (especially advection fog): drizzle, in winter light snowfall or super cooled drizzle.
Temperature	St/Fog covered areas in winter generally warmer, in summer cooler than adjacent cloud-free areas. Reduced diurnal variation of temperature within cloudy areas.
Wind (incl. gusts)	For Radiation Fog light or calm wind conditions, for Advection Fog moderate, even slightly gusty winds.
Other relevant information	Visibility in Fog below 1000 m. Fluctuations in visibility, when cloud base temporarily lifted or lowered. Icing possible within the super cooled cloud conditions. The most probable location for icing near the cloud top, where droplet size is the largest.