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AAnnttiiccyycclloonneess
Remember anticyclones 
form as a result of air piling 
up aloft. 
This encourages air to 
subside / sink down. 
As the air sinks, it warms, 
this increases the amount 
of water the air can hold, 
and thus keeps the sky 
relatively cloud free. 
Leading edge
AAnnttiiccyycclloonneess,, HHiigghhss 
 AAnnttiiccyycclloonneess oovveerr tthhee BBrriittiisshh IIsslleess ooccccuurr 
ffrreeqquueennttllyy,, bbuutt aarree lleessss ccoommmmoonn tthhaann 
ddeepprreessssiioonnss.. 
 AAnnttiiccyycclloonneess ggiivvee rriissee ttoo ddiiffffeerreenntt wweeaatthheerr 
ccoonnddiittiioonnss,, ddeeppeennddiinngg uuppoonn tthhee ttiimmee ooff yyeeaarr.. 
 AAnnttiiccyycclloonneess mmoovvee sslloowwllyy aanndd aarree ssttaabbllee 
ffeeaattuurreess.. 
 TThheeyy ccaann bbee 33000000kkmm wwiiddee –– mmuucchh bbiiggggeerr tthhaann 
ddeepprreessssiioonnss 
 HHiigghh pprreessssuurree ssyysstteemmss tteenndd ttoo bbee lloonnggeerr llaassttiinngg 
tthhaann ddeepprreessssiioonnss,, oonnccee ‘‘bblloocckkeedd’’ tthheeyy ccaann llaasstt 
uupp 1100 ddaayyss.. TThheeyy ddeefflleecctt ddeepprreessssiioonnss aawwaayy ffrroomm 
UUKK && WWeesstteerrnn EEuurrooppee..
AAnnttiiccyycclloonneess aarree cchhaarraacctteerriisseedd bbyy:: 
 HHiigghh pprreessssuurree rreeaaddiinnggss iinn tthhee mmiiddddllee.. 
 FFaarr aappaarrtt iissoobbaarrss == ccaallmm wwiinndd.. 
 TThhee aaiirr ssuubbssiiddeess ((ssiinnkkss)).. IItt wwaarrmmss aaddiiaabbaattiiccaallllyy 
wwhhiicchh lleeaaddss ttoo aa ddeeccrreeaassee iinn rreellaattiivvee hhuummiiddiittyy == llaacckk 
ooff cclloouudd && ddrryy ccoonnddiittiioonnss.. 
 AAiirr mmoovviinngg aawwaayy ffrroomm tthhee cceennttrree ooff tthhee hhiigghh.. 
 AAiirr ssppiinnss cclloocckkwwiissee aarroouunndd ffrroomm tthhee hhiigghh.. 
 TThheeyy nnoorrmmaallllyy ttrraavveell ttoo tthhee BBrriittiisshh IIsslleess ffrroomm 
mmaaiinnllaanndd EEuurrooppee.. 
 HHiigghh pprreessssuurree ssyysstteemmss ffoorrmm ccoommmmoonnllyy oovveerr tthhee 
AAzzoorreess –– ‘‘AAzzoorreess HHiigghh’’..
Anticyclones give rriissee ttoo ddiiffffeerreenntt 
ccoonnddiittiioonnss,, ddeeppeennddiinngg oonn tthhee ttiimmee ooff 
yyeeaarr.. 
WWiinntteerr 
 CCoolldd ddaayy ttiimmee tteemmppss,, 
ffrroomm bbeellooww 00oocc ttoo 55oocc 
 VVeerryy ccoolldd nniigghhtt ttiimmee 
tteemmppss –– ffrroossttss bbeellooww 
00oocc 
 TThhiicckk mmoorrnniinngg ffooggss aarree 
oofftteenn pprreesseenntt 
SSuummmmeerr 
 HHoott ddaayy ttiimmee tteemmpp,, 
oovveerr 2255oocc 
 WWaarrmm nniigghhtt ttiimmee tteemmppss 
 MMaayy nnoott ffaallll bbeellooww 1155oocc 
 GGeenneerraallllyy cclleeaarr sskkiieess 
bbyy ddaayy && nniigghhtt
AAnnttiiccyycclloonneess ggiivvee rriissee ttoo ddiiffffeerreenntt ccoonnddiittiioonnss,, 
ddeeppeennddiinngg oonn tthhee ttiimmee ooff yyeeaarr.. 
WWiinntteerr 
 LLooww lleevveell cclloouudd mmaayy 
lliinnggeerr aanndd rraaddiiaattiioonn 
ffoogg mmaayy rreemmaaiinn iinn llooww 
llyyiinngg aarreeaass 
 CCaauusseess hhiigghh lleevveellss ooff 
aaiirr ppoolllluuttiioonn iinn uurrbbaann 
aarreeaass aass ppoolllluuttaannttss 
aarree ttrraappppeedd bbyy 
tteemmppeerraattuurree iinnvveerrssiioonn 
SSuummmmeerr 
 HHaazzyy ssuunnsshhiinnee iinn ssoommee 
aarreeaass 
 EEaarrllyy mmoorrnniinngg mmiissttss 
wwhhiicchh ddiissppeerrssee qquuiicckkllyy 
 HHeeaavvyy ddeeww iinn tthhee 
mmoorrnniinnggss 
 EEaasstt ccooaasstt hhaass sseeaa ffrreettss 
oorr hhaaaarrss ((oonnsshhoorree wwiinnddss)) 
 TThhuunnddeerr ssttoorrmmss ccaann 
ooccccuurr wwhheenn RRHH iiss hhiigghh 
((SSppaanniisshh PPlluummee))
ANTICYCLONES
ANTICYCLONES
ANTICYCLONES
ANTICYCLONES

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ANTICYCLONES

  • 2. Remember anticyclones form as a result of air piling up aloft. This encourages air to subside / sink down. As the air sinks, it warms, this increases the amount of water the air can hold, and thus keeps the sky relatively cloud free. Leading edge
  • 3. AAnnttiiccyycclloonneess,, HHiigghhss  AAnnttiiccyycclloonneess oovveerr tthhee BBrriittiisshh IIsslleess ooccccuurr ffrreeqquueennttllyy,, bbuutt aarree lleessss ccoommmmoonn tthhaann ddeepprreessssiioonnss..  AAnnttiiccyycclloonneess ggiivvee rriissee ttoo ddiiffffeerreenntt wweeaatthheerr ccoonnddiittiioonnss,, ddeeppeennddiinngg uuppoonn tthhee ttiimmee ooff yyeeaarr..  AAnnttiiccyycclloonneess mmoovvee sslloowwllyy aanndd aarree ssttaabbllee ffeeaattuurreess..  TThheeyy ccaann bbee 33000000kkmm wwiiddee –– mmuucchh bbiiggggeerr tthhaann ddeepprreessssiioonnss  HHiigghh pprreessssuurree ssyysstteemmss tteenndd ttoo bbee lloonnggeerr llaassttiinngg tthhaann ddeepprreessssiioonnss,, oonnccee ‘‘bblloocckkeedd’’ tthheeyy ccaann llaasstt uupp 1100 ddaayyss.. TThheeyy ddeefflleecctt ddeepprreessssiioonnss aawwaayy ffrroomm UUKK && WWeesstteerrnn EEuurrooppee..
  • 4. AAnnttiiccyycclloonneess aarree cchhaarraacctteerriisseedd bbyy::  HHiigghh pprreessssuurree rreeaaddiinnggss iinn tthhee mmiiddddllee..  FFaarr aappaarrtt iissoobbaarrss == ccaallmm wwiinndd..  TThhee aaiirr ssuubbssiiddeess ((ssiinnkkss)).. IItt wwaarrmmss aaddiiaabbaattiiccaallllyy wwhhiicchh lleeaaddss ttoo aa ddeeccrreeaassee iinn rreellaattiivvee hhuummiiddiittyy == llaacckk ooff cclloouudd && ddrryy ccoonnddiittiioonnss..  AAiirr mmoovviinngg aawwaayy ffrroomm tthhee cceennttrree ooff tthhee hhiigghh..  AAiirr ssppiinnss cclloocckkwwiissee aarroouunndd ffrroomm tthhee hhiigghh..  TThheeyy nnoorrmmaallllyy ttrraavveell ttoo tthhee BBrriittiisshh IIsslleess ffrroomm mmaaiinnllaanndd EEuurrooppee..  HHiigghh pprreessssuurree ssyysstteemmss ffoorrmm ccoommmmoonnllyy oovveerr tthhee AAzzoorreess –– ‘‘AAzzoorreess HHiigghh’’..
  • 5. Anticyclones give rriissee ttoo ddiiffffeerreenntt ccoonnddiittiioonnss,, ddeeppeennddiinngg oonn tthhee ttiimmee ooff yyeeaarr.. WWiinntteerr  CCoolldd ddaayy ttiimmee tteemmppss,, ffrroomm bbeellooww 00oocc ttoo 55oocc  VVeerryy ccoolldd nniigghhtt ttiimmee tteemmppss –– ffrroossttss bbeellooww 00oocc  TThhiicckk mmoorrnniinngg ffooggss aarree oofftteenn pprreesseenntt SSuummmmeerr  HHoott ddaayy ttiimmee tteemmpp,, oovveerr 2255oocc  WWaarrmm nniigghhtt ttiimmee tteemmppss  MMaayy nnoott ffaallll bbeellooww 1155oocc  GGeenneerraallllyy cclleeaarr sskkiieess bbyy ddaayy && nniigghhtt
  • 6. AAnnttiiccyycclloonneess ggiivvee rriissee ttoo ddiiffffeerreenntt ccoonnddiittiioonnss,, ddeeppeennddiinngg oonn tthhee ttiimmee ooff yyeeaarr.. WWiinntteerr  LLooww lleevveell cclloouudd mmaayy lliinnggeerr aanndd rraaddiiaattiioonn ffoogg mmaayy rreemmaaiinn iinn llooww llyyiinngg aarreeaass  CCaauusseess hhiigghh lleevveellss ooff aaiirr ppoolllluuttiioonn iinn uurrbbaann aarreeaass aass ppoolllluuttaannttss aarree ttrraappppeedd bbyy tteemmppeerraattuurree iinnvveerrssiioonn SSuummmmeerr  HHaazzyy ssuunnsshhiinnee iinn ssoommee aarreeaass  EEaarrllyy mmoorrnniinngg mmiissttss wwhhiicchh ddiissppeerrssee qquuiicckkllyy  HHeeaavvyy ddeeww iinn tthhee mmoorrnniinnggss  EEaasstt ccooaasstt hhaass sseeaa ffrreettss oorr hhaaaarrss ((oonnsshhoorree wwiinnddss))  TThhuunnddeerr ssttoorrmmss ccaann ooccccuurr wwhheenn RRHH iiss hhiigghh ((SSppaanniisshh PPlluummee))