In fair weather and light-to-moderate offshore wind, a sea breeze is likely to develop. Warm air rises over land. It then cools, descends, and blows onshore, generally up to force 4 in strength.
This occurs on a clear night when the air cools over land and flows downhill and out to sea, particularly from river estuaries. The wind is usually no more than force 2–3, except near mountains.
Fog It is never advisable to set out in fog. However, if you are caught out: Fix your position.