1. Ch. 20: Weather Patterns & Severe Storms Earth-Space Science Bremen High School Teacher : Aaron McNeely Arizona monsoon storm from Kitt Peak Observatory

6. Air Masses Polar (P) (cold) Tropical (T) (warm) Continental (c) (land) cP (land, cold) cT (land, warm) Maritime (m) (water) mP (water, cold) mT (water, warm)

7. North American Air Masses Air masses are classified by the region over which they form Nor’easters SW monsoons Indian Summer

11. Arizona Monsoon http://www.solarhaven.org/MONSOON.htm

16. Warm Front

18. Cold Front

21. Occluded Fronts A cold front moves toward a warm front, forcing warm air aloft A cold front merges with the warm front to form an occluded front that drops heavy rain Because occluded fronts can move slowly, light precipitation falls for many days

23. Cyclonic System (Low Pressure) Note the warm, cold, and occluded fronts

24. Satellite View of a Cyclone Note the counter-clockwise spiral over the continental US

28. Stages of Thunderstorm Development Time

32. The Great Tornado

35. Cross-Section of an Hurricane

37. 2008 Hurricane Names Arthur Bertha Cristobal Dolly* Edouard Fay Gustav* Hanna Ike* Josephine Kyle Laura Marco Nana * US landfall, major hurr’ Omar Paloma Rene Sally Teddy Vicky Wilfred

38. 2009 Hurricane Names http://www.nhc.noaa.gov/aboutnames.shtml Ana Bill Claudette Danny Erika Fred Grace Henri Ida Joaquin Kate Larry Mindy Nicholas Odette Peter Rose Sam Teresa Victor Wanda

40. Katrina—August 28, 2005 New Orleans freeway submerged Katrina NASA satellite view http://www.katrinahelp.com/hurricane-katrina-pictures.html