IL-7: Fronts and Cyclones

  Part I Types of Fronts A advanced is authentic as the abuttals amid two airmasses. The aloft types being: mT - amphibian Tropical (moist and warm) mP - amphibian Polar (moist and cold) cT - continental Tropical (dry and warm) cP - continental Polar (dry and cold) When any of these airmasses meet, they anatomy a front. Depending on which airmasses accommodated and which airmass is affective advanced (and which is affective out of the way) you will accept altered kinds of fronts. The two capital types of fronts are algid fronts, breadth algid air is advancing advanced against balmy air, and balmy fronts, breadth balmy air is advancing advanced against algid air. This video gives a abrupt overview of these two types of fronts: What are acclimate fronts? (Links to an alien site.) Question 1: Call three (3) differences amid algid and balmy fronts. There are alternative types of fronts, however. Back a algid or balmy advanced stalls, or stops moving, we alarm this a anchored front. Also, in some cases, a algid advanced can bolt up to a balmy advanced and beat it. Back this happens, we alarm it an chock-full front. This folio reviews these four types of fronts, forth with the types of acclimate they cause: (Links to an alien site.) Question 2: Which blazon of advanced tends to aftermath the best agitated acclimate amid all aboveboard types? Question 3: Why do you anticipate that blazon of advanced has the best agitated weather? One final blazon of advanced is alleged a dry line. A dry band is a abuttals amid balmy dry (cT) and balmy clammy (mT) airmasses. Dry curve are a accepted breadth for the accumulation of thunderstorms in the bounce in the axial United States. Part II Midlatitude Cyclones A midlatitude cyclone is a able low burden breadth amid about amid 20-70 degrees arctic or south latitude. These cyclones usually accept one or added fronts associated with them. This folio describes an arcadian archetypal of a midlatitude cyclone in the arctic hemisphere: (Links to an alien site.) Question 4: Why does there tend to be balmy air advanced of the midlatitude cyclone? As we abstruse previously, apprehension circle counterclockwise about a low burden arrangement in the arctic hemisphere. Therefore, we can use wind barbs on a acclimate map to advice analyze the breadth of the low. This folio describes this process: (Links to an alien site.) This circling of the winds, transports airmasses from the south and from the arctic and wraps them about the midlatitude cyclone. This acts to accent the cyclone and strengthen the fronts, or the boundaries amid these airmasses. This folio describes this process: (Links to an alien site.) Question 5: a. What is the accepted wind administration in the balmy area of a midlatitude cyclone? b. What is the accepted wind administration in the algid area of a midlatitude cyclone? We can additionally use accessory adumbration to analyze the breadth of and acclimate associated with midlatitude cyclones. This accessory angel shows a actual able-bodied developed cyclone over the Great Lakes region: (Links to an alien site.) In this image, we see a archetypal "comma-shaped" cloud. This folio shows some alternative examples of these billow patterns: (Links to an alien site.) Here is a video assuming a accessory bend of the development of one of these breach clouds: Strong Extratropical Cyclone Over the US Midwest, October 25-27, 2010 (Links to an alien site.) Notice that the billow arrangement changes over the activity of the storm and is never constant. Part III Searching for Cyclones Using what we accept learned, we will now try to acquisition some midlatitude cyclones over Arctic America. Go to this page, assuming the accepted breadth of fronts over the abutting U.S. (Links to an alien site.) Right-click (or ctrl-click) and baddest "Save image." Upload the map back you abide the assignment. You can you this folio to advice you adapt the map if needed: (Links to an alien site.) Question 6: Call the breadth of any low burden centers on the map, aural the abutting U.S. Question 7: For EACH of the low burden centers declared in catechism 6, call the breadth and blazon of any fronts that assume to be associated with anniversary low. (i.e. is affecting the low or extending out from the low). Now we will attending at the accepted accessory imagery.  Go to this folio for accessory imagery: (Links to an alien site.) Select "Infrared (color)" from the radio buttons on the left. Select "Large Size" from the radio buttons aloft the map. Click on "Contiguous U.S." on the map. Right-click (or ctrl-click) and baddest "Save image." Upload the map back you abide the assignment. This map shows billow top temperatures. Blues are college colder billow tops, while greens and yellows are lower warmer billow tops. Oranges and reds are areas of no or actual low clouds. Now we will analyze the acclimate map to the accessory image. Attending the two images ancillary by side. Question 8: For EACH of the low burden areas declared in catechism 6, call the clouds at the breadth of the low burden center. Question 9: For EACH of the fronts declared in catechism 7, call the clouds forth the fronts. Question 10: Call how you could use your ability of the accepted apportionment of the atmosphere, airmasses and fronts, and the acclimate map and accessory angel you downloaded aloft to anticipation the acclimate for Salt Lake City, UT over the abutting 24 hours. Question 11: Using the adjustment you call in catechism 10, what would be your best assumption for what the acclimate will be like in Salt Lake City, UT over the abutting 24 hours? Be as abundant as possible, AND call WHY you came up with this forecast.

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