GEO 211 1st Edition Lecture 29 Outline of Last Lecture I El Nino and La Nina A El nino abnormal warming of the Pacific Ocean between South America and Australia and Indonesia in the equatorial region B La nina extensive below normal cooling of the central eastern Pacific Ocean II Air masses and fronts A Air mass large body of air that has a uniform weather characteristics particularly temperature and water vapor content B Source regions birthplace flat land surfaces with light winds Outline of Current Lecture III Air masses that affect North America A Continental Arctic CA B Maritime Polar mP C Continental Polar cP D Continental tropical cT E Maritime tropical mT F Fronts Warm front Overrunning G Cold front H Occluded front Two types o Cold type o Warm type I Stationary front Current Lecture III Air masses that affect North America These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute A Continental Arctic CA Very cold dry Origin arctic basin and the Greenland B Maritime Polar mP Mild cool moist Origin North Pacific North Atlantic C Continental Polar cP Cold dry Origin interior Canada parts of Alaska D Continental tropical cT Hot dry Origin Northern Mexico Southwestern US summer only E Maritime tropical mT Warm moist Origin Gulf of Mexico Caribbean sea tropical Atlantic F Fronts Transition zone between two different air masses Warm front zone where warmer air is replacing cooler air o Ex mT replacing CP by cooler air retreats while warm air glides gen Hy over retreating cooler air a gentle slope for ms average slope 1 300 Overrunning gliding over cooler air o Different clouds develop along the warm front slope figure 11 22 o Warm front moves slowly G Cold front Zone where cooler air is replacing warmer air Cold dense air lifts warm air up steeply forming a steeper cold front slope Rain cloud formed is cumulonimbus Accompanied with heavy rain fall and floods thunderstorms hail tornadoes lightning Cold front moves faster than warm front H Occluded front Formed when a cold front catches up with a warm front Two types o Cold type air mass behind the cold type occluded front is colder than air ahead of it o Warm type air mass ahead of the occluded front is colder than air behind it I Stationary front A front that is nearly stationary Winds blow almost parallel an from opposite directions on each side of the front
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