high pressure area high pressure area high anticyclone region atmospheric pressure surface planet greater surrounding environment winds high pressure areas flow outward higher pressure areas near centers lower pressure areas centers gravity adds forces causing general movement higher pressure column air near center area greater density greater weight compared lower pressure lower density lower weight air outside center planet rotating underneath atmosphere forces arise surface atmosphere air flow center periphery direct twisted effect merely apparent force arise observer rotating frame reference viewed twist wind direction direction rotation planet strongest high pressure areas associated cold air masses push away polar regions winter sun warm neighboring regions highs change character weaken relatively warmer water bodies somewhat weaker common high pressure areas caused atmospheric areas large masses cooler drier air descend elevation lower temperatures precipitated lighter water half molecular weight main constituents atmosphere oxygen nitrogen features highs understood context scale relatively enduring dynamics planet atmospheric circulation example massive atmospheric occur descending branches cells cells cells help form subtropical ridge steer tropical waves tropical cyclones ocean strongest summer subtropical ridge helps form world english language weather maps high pressure centers identified letter maps languages use different letters symbols wind circulation northern southern direction wind flow atmospheric high pressure area low pressure area seen depends hemisphere scientific terms english describe weather systems generated highs lows introduced british scientific theories explain general phenomena originated centuries earlier term cyclone coined describe especially destructive storm mauritius february cyclone forms low pressure area anticyclone term kind weather high pressure area coined indicate area winds revolved opposite direction cyclone british english opposite direction clockwise referred making label logical extension simple rule thumb high pressure areas generally air flows center outward force given earth rotation air circulation opposite direction earth apparent rotation viewed hemisphere pole earth winds low pressure area rotate counter clockwise northern hemisphere clockwise southern opposite cases occurs case high results derive effect article explains detail physics provides animation model aid understanding formation high pressure systems form downward motion atmospheric layer weather occurs preferred areas flow pattern higher levels beneath western weather maps areas winds known confluence height lines near level non divergence near hpa pressure surface midway half atmospheric pressure surface high pressure systems alternatively referred english language weather maps high pressure centers identified letter english highest pressure value constant pressure upper level charts located highest height line typical conditions highs frequently associated light winds surface lower portion general dry air mass heating high pressure typically brings clear skies day clouds present reflect sunlight incoming solar radiation temperatures rise night absence clouds means outgoing radiation heat energy surface absorbed giving cooler low temperatures seasons surface winds light produced directly high pressure system lead buildup urban areas ridge leading widespread low level relative humidity rises percent overnight fog form strong vertically shallow high pressure systems moving higher latitudes lower latitudes northern hemisphere associated continental arctic air masses arctic air moves ocean air mass greatly warmer water takes character maritime air mass reduces strength high pressure system extremely cold air moves relatively warm oceans polar lows develop warm moist maritime tropical air masses tropical sources slower modify arctic air masses terms high pressure forms horse latitudes zone latitudes degrees equator result air equator hot air rises losing moisture transported descends creating high pressure area cell circulation known subtropical ridge subtropical high strongest summer subtropical ridge warm core high pressure system meaning height world caused high pressure systems high pressure areas acquire based names land based high remains quasi stationary month time year making unique regard bit larger persistent counterpart north_america surface winds accelerating valleys western pacific ocean coastline causing winter monsoon arctic high pressure systems high cold core meaning weaken height influence azores high known bermuda high brings fair weather mid late summer heat waves western europe southerly periphery clockwise circulation easterly waves tropical cyclones develop ocean western portion ocean basins hurricane season highest barometric pressure recorded earth inhg measured december connection wind wind flows areas high pressure areas low pressure density differences air masses stronger high pressure systems contain cooler drier air air mass dense flows areas warm moist vicinity low pressure areas advance associated cold fronts stronger pressure difference pressure gradient high pressure system low pressure system stronger wind force caused earth rotation gives winds high pressure systems clockwise circulation northern hemisphere wind moves outward right center high pressure circulation southern hemisphere wind moves outward left center high pressure friction land wind flowing high pressure systems causes wind flow outward case absence friction known wind
High-pressure area