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  1. 1. DDeepprreessssiioonnss!! ((CCyycclloonneess))
  2. 2. DDeepprreessssiioonnss –– CCyycclloonneess -- LLoowwss  DDeepprreessssiioonnss oovveerr tthhee BBrriittiisshh IIsslleess ooccccuurr ffrreeqquueennttllyy,, ggiivveenn tthhee llooccaattiioonn ooff tthhee PPoollaarr FFrroonntt JJeett SSttrreeaamm aanndd mmeeeettiinngg ppooiinntt ooff ddiiffffeerreenntt aaiirr mmaasssseess..  DDeepprreessssiioonnss ggiivvee rriissee ttoo uunnsseettttlleedd,, wweett aanndd wwiinnddyy wweeaatthheerr..  TThheeyy tteenndd ttoo bbee sshhoorrtt lliivveedd ffeeaattuurreess,, mmoovveedd oovveerr tthhee UUKK bbyy wwiinndd wwiitthhiinn aa ffeeww hhoouurrss.. HHoowweevveerr,, tthheeyy mmaayy ttrraavveell iinn ‘‘ffaammiilliieess’’ wwhhiicchh ggiivveess rriissee ttoo aa lloonnggeerr ppeerriioodd ooff uunnsseettttlleedd wweeaatthheerr..
  3. 3. Depressions aarree cchhaarraacctteerriisseedd bbyy::  LLooww pprreessssuurree rreeaaddiinngg iinn tthhee mmiiddddllee..  CClloossee iissoobbaarrss == ssttrroonngg wwiinndd..  AAiirr mmoovviinngg ttoowwaarrdd tthhee cceennttrree ooff tthhee llooww..  AAiirr ssppiinnss aannttiicclloocckkwwiissee aarroouunndd tthhee llooww..  TThheeyy nnoorrmmaall ttrraavveell WW -->> EE oovveerr tthhee UUKK,, dduuee ttoo tthhee pprreevvaaiilliinngg wwiinndd ddiirreeccttiioonn..  LLooww pprreessssuurree ssyysstteemmss ffoorrmm ccoommmmoonnllyy oovveerr IIcceellaanndd –– ‘‘IIcceellaannddiicc LLooww’’..
  4. 4. FFrroonnttaall RRaaiinnffaallll CClliipp SSuurrffaaccee PPrreessssuurree CChhaarrtt
  5. 5. These diagrams show the wind moving in towards the low pressure centre. Notice the air then lifts, creating cloud and rain.
  6. 6. Polar Front Warm wind Cold wind Warm air from the south meets the colder air from the North Early Stage
  7. 7. Warm wind Cold wind Warm air rises over the cold air – creating the warm front Open Stage The cold air undercuts the warm air, creating a steeper cold front.
  8. 8. Warm wind Cold wind The cold front travels faster, eventually catching up the warm front – forming an occlusion. Occlusion – the cold front over rides the warm front. Occluded Stage
  9. 9. Cold wind Dissolved Stage The occlusion is fully closed – therefore dissolved.
  10. 10. Depressions
  11. 11. Occluded fronts Occluded fronts aarree pprroodduucceedd wwhheenn aa ffaasstt mmoovviinngg ccoolldd ffrroonntt ccaattcchheess aanndd oovveerrttaakkeess aa sslloowweerr mmoovviinngg wwaarrmm ffrroonntt
  12. 12. WWeeaatthheerr ffoorreeccaassttiinngg  Below is an example of a weather mmaapp sshhoowwiinngg aa wwaarrmm aanndd aa ccoolldd ffrroonntt ffoorr tthhee BBrriittiisshh IIsslleess.. 1. 9am 2. 11am (warm front overhead) 3. 3pm (cold front overhead) Describe what the weather will be like in East Anglia as the warm front and cold front pass overhead
  13. 13. FFoorreeccaasstt

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