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FOGS 1. 2. 3. AAddvveeccttiioonn FFoogg
HHoorriizzoonnttaall mmoovveemmeenntt ooff aaiirr
CCoommmmoonn aatt llaanndd//wwaatteerr iinntteerrffaacceess,, eegg.. rriivveerrss,,
llaakkeess aanndd ccooaassttlliinneess
LLaanndd aanndd sseeaa bbrreeeezzeess aarree ggeenneerraatteedd bbyy tthhee
ddiiffffeerreenntt hheeaattiinngg ooff llaanndd aanndd sseeaa
OOnnsshhoorree wwiinnddss ccrreeaattee aaddvveeccttiioonn ffoogg oovveerr tthhee
nnoorrtthh sseeaa
TThheessee ccaann bbee rreeffeerrrreedd ttoo aass aa sseeaa ffrreett oorr hhaaaarr
5. Haar fog off
East coast
AAddvveeccttiioonn FFoogg Chinese tourist
spot hidden in early
morning fog
Advection fog
near a river –
horizontal
movement of
air over colder
surface
Golden Gate
Bridge San
Francisco –
105 foggy
days a year
Salt provides an ideal hygroscopic nuclei
to help form this haar fog off California
6. RRaaddiiaattiioonn FFoogg
CCoommmmoonn iinn wwiinntteerr ttiimmee
LLooww eelleevvaattiioonn ooff tthhee ssuunn iinn tthhee sskkyy mmeeaannss lleessss
iinnssoollaattiioonn aanndd tthhee ggrroouunndd rreemmaaiinnss ccoolldd
TThhee aaiirr wwiillll bbee hheeaatteedd ggrraadduuaallllyy dduurriinngg tthhee ddaayy
AAtt nniigghhtt,, tthhee ccoolldd ggrroouunndd ffuurrtthheerr ccoooollss tthhee
oovveerrllyyiinngg ccoolldd aaiirr mmaassss ttoo iittss ddeeww ppooiinntt,, wwhheenn
ccoonnddeennssaattiioonn ooccccuurrss
7. RRaaddiiaattiioonn FFoogg
AAllssoo aa ffeeaattuurree ooccccuurrrriinngg iinn vvaalllleeyyss
AAiirr aatt hhiigghheerr aallttiittuuddee ccoooollss ffiirrsstt aanndd ssiinnkkss iinnttoo tthhee
vvaalllleeyy
TThhiiss ffoorrcceess wwaarrmmeerr aaiirr ttoo rriissee
TThhiiss ffoogg iiss ccoommmmoonnllyy vveerryy ddeennssee aanndd ccaann ccaauussee
sseevveerree ffrroossttss
CCoommmmoonn iinn tthhee AAllppss
8. RRaaddiiaattiioonn
FFoogg
Thick fog makes travelling very difficult &
dangerous
Pollution gets trapped under a
temperature inversion producing
the orange smog over LA
9. 10. 11. FFoogg oorr MMiisstt??
DENSITY
Fog – when visibility is less than 1km
Mist – when visibility is between 1 -2km
There is no difference between a cloud in the air
and fog on the ground other than their altitude
12. 13.