air mass anticyclogenesis anticyclone atlantic oceanographic and meteorological laboratory atmosphere atmospheric circulation atmospheric pressure barents sea baroclinity barotropic celsius centre for research on the epidemiology of disasters clockwise cold front condensation convection coriolis effect cyclogenesis cyclone catarina density dew point doppler effect drought dry line earth european windstorm extraterrestrial cyclone extratropical cyclone fahrenheit flood fog gas giant geographical pole hail hubble space telescope humidity huracan international space station jet stream kerry emanuel key west latitude mars mesocyclone mesoscale meteorology meteorology nasa national hurricane center national oceanic and atmospheric administration national weather service neptune northern hemisphere occluded front polar cyclone polar front polar low rain saffir-simpson hurricane scale severe weather small dark spot south atlantic tropical cyclone southern hemisphere spiral squall line storm storm surge subtropical cyclone supercell surface weather analysis synoptic scale meteorology temperature thunderstorm tornado tropical cyclogenesis tropical cyclone tropics troposphere united states university of aberdeen vortex warm front waterspout weather weather front weather radar wind wind shear