Jon Ahlquist Chapter 11 Review Air masses What is an air mass What conditions are needed for an air mass to form Where are the source regions for air masses i e where do they form What two characteristics are used to catalog air masses What 3 names characterize air mass temperature as warm cold or very cold What 2 names characterize air mass humidity as dry or moist Question for Review 11 p 306 11 What type of air mass would be responsible for Heavy snow showers low temps at Buffalo NY Hot muggy weather in the Midwest and East Daily afternoon thunderstorms along the Gulf Coast Heavy snow showers along the W slope of the Rockies 10 27 2006 Air Masses Fronts Question for Thought 2 p 307 Explain how an anticyclone region of high pressure during autumn can bring record breaking low temperatures and cP air to the SE states and only a few days later it can be bring very high temperatures and mT air to the same area Fronts Which kind of front warm or cold more commonly has front Cold front Warm front door cold front Occluded front Back greater contrast between warm and cold air intense precipitation Steady precipitation lasting hours More What kinds of fronts are transition zones between Tropical and polar air 2 types and mP air 2 types cT and mT air 1 type cP MET1010 Intro to the Atmosphere What is the typical slope of a front Which is typically steeper a cold front or a warm front Are cumulonimbus clouds more common at cold fronts or warm fronts Why Are nimbostratus clouds more common at cold fronts or warm fronts Why Frontal Passage A What is a front What is a Stationary Is high or low pressure typically at the center of air masses What kind of air mass usually affects Florida What kind of air mass usually affects Michigan Why don t air masses typically form in mid latitudes What is air mass modification Give an example of air mass modification What is lake effect snow Where in the US is it most common Imagine you are in warm air and a cold front approaches What weather changes do you expect in winds temperature pressure clouds precipitation and dew point See table 11 2 on p 300 Imagine you are in cold air and a warm front approaches What weather changes do you expect in winds temperature pressure clouds precipitation and dew point See table 11 3 on p 302 1 Jon Ahlquist 10 27 2006 Question for Review 15 p 307 15 Based on the following weather forecasts what type of front will most likely pass the area See map p 297 for c d a c Increasing cloudiness and warm today with possibility of showers by evening Turning much colder tonight Winds SW becoming gusty and shifting to NW by tonight d Increasing high cloudiness and cold this morning Clouds increasing and lowering this afternoon with a chance of snow or rain tonight Precipitation ending tomorrow morning Turning much warmer Winds light easterly today becoming SE tonight and SW tomorrow a Light rain and cold today with temperatures just above freezing SE winds shifting to W tonight Turning colder with rain heavy and possibly changing to snow Cold occluded b Cool today with rain becoming heavy at times by this afternoon Warmer tomorrow Winds SE becoming W by tomorrow morning A warm occluded front is more likely than a warm front because precip is heavy and winds shift to W For a warm front precip is light to moderate and winds shift to S or SW See tables 11 3 p 302 and 11 4 p 305 MET1010 Intro to the Atmosphere 2
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