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AAnnttiiccyycclloonneess -- 
FFoogg
FFoogg
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
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
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
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
RRaaddiiaattiioonn 
FFoogg 
Thick fog makes travelling very difficult & 
dangerous 
Pollution gets trapped under a 
temperature inversion producing 
the orange smog over LA
TTeemmppeerraattuurree IInnvveerrssiioonn 
LA has perfect topography for Smog 
formation. Think about effects on health!
WWhhaatt iiss tthhee ddiiffffeerreennccee 
bbeettwweeeenn ffoogg aanndd mmiisstt??
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
FFoogg oorr MMiisstt??
FFoogg oorr MMiisstt??

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FOGS

  • 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
  • 4.
  • 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. TTeemmppeerraattuurree IInnvveerrssiioonn LA has perfect topography for Smog formation. Think about effects on health!
  • 10. WWhhaatt iiss tthhee ddiiffffeerreennccee bbeettwweeeenn ffoogg aanndd mmiisstt??
  • 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