Please Go To Page 12 Fronts ©Mark Place, 2007-2008 www.LearnEarthScience.com

a boundary (interface) FRONTS a boundary (interface) between air masses

The Rule: triangles and bumps always point in the direction the front is moving

cold front moving south - b an occluded front - e stationary front with cold air on the south side - d warm front moving north - a stationary front with warm air on the south side - c

cP mT

Cold Fronts Animation #1 Images

Warm Fronts Animation #1 Images

PAGE 13 COLD FRONTS: Using the Words below, complete the paragraph. 15 degrees, cold, cold, colder, colder, cooler, clouds, drier, hail, rain, thunderstorms, tornadoes, towering clouds form, warm, warmer Passage of a cold front: Cold fronts occur when a .............. air mass replaces a ................ air mass.  In a cold front the .............. air follows the warm air, and, because .................. air is denser, pushes ................ air out of its way, forcing the warm air to rise. The lifting warm air mass becomes ................, and ................. start to form. Precipitation at cold fronts are usually heavier although less extensive (50-70 km) and less prolonged. The reason for this is that the uplift of warm air there is stronger due to the undercutting of cold air, so......................................., and .........., ......................................, ................ and ............................ can occur. The air behind a cold front is noticeably .......................... and ................... than the air ahead of it. When the cold front passes through, temperatures can drop more than ........................... within the first hour.

PAGE 13 - ans COLD FRONTS: Using the Words below, complete the paragraph. 15 degrees, cold, cold, colder, colder, cooler, clouds, drier, hail, rain, thunderstorms, tornadoes, towering clouds form, warm, warmer Passage of a cold front: Cold fronts occur when a cold air mass replaces a warm air mass.  In a cold front the colder air follows the warm air, and, because cold air is denser, pushes warmer air out of its way, forcing the warm air to rise. The lifting warm air mass becomes cooler , and clouds start to form. Precipitation at cold fronts are usually heavier although less extensive (50-70 km) and less prolonged. The reason for this is that the uplift of warm air there is stronger due to the undercutting of cold air, so towering clouds, and rain, thunderstorms, hail and tornadoes can occur. The air behind a cold front is noticeably colder and drier than the air ahead of it. When the cold front passes through, temperatures can drop more than 15 degrees within the first hour.

PAGE 13 WARM FRONTS: Using the Words below, complete the paragraph air, cirrus clouds, cold, colder air mass, in front of them, lifts up, move slowly, settling over the cold front, warm, warmer, warmer and more humid Warm fronts: Warm fronts occur, when a ......................air mass approaches a ............................... The warmer air ....................... and over the colder air. .................fronts are usually more gentle than ..............fronts, ................................, gently ..................................................and moving it out of the way. Precipitation at warm fronts are usually less heavy although more extensive (300-400 km), than at the cold fronts. The .................behind a warm front is warmer and more moist than the air ahead of it. Warm fronts bring more steady, lighter rain or snow ………………………, which can last from a few hours to several days. When a warm front passes through, the air becomes noticeably ...................................than it was before. The first signs of the warm front are the ..........................., followed by the cirrostratus, altostratus, nimbocumulus and stratocumulus types of clouds.

PAGE 13 - ans WARM FRONTS: Using the Words below, complete the paragraph air, cirrus clouds, cold, colder air mass, in front of them, lifts up, move slowly, settling over the cold front, warm, warmer, warmer and more humid Warm fronts: Warm fronts occur, when a warmer air mass approaches a colder air mass The warmer air lifts up and over the colder air. Warm fronts are usually more gentle than cold fronts, move slowly, gently settling over the cold front and moving it out of the way. Precipitation at warm fronts are usually less heavy although more extensive (300-400 km), than at the cold fronts. The air behind a warm front is warmer and more moist than the air ahead of it. Warm fronts bring more steady, lighter rain or snow in front of them , which can last from a few hours to several days. When a warm front passes through, the air becomes noticeably warmer and more humid .than it was before. The first signs of the warm front are the cirrus clouds, followed by the cirrostratus, altostratus, nimbocumulus and stratocumulus types of clouds.

Animation PAGE 12

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factoids

Roy Sullivan

Roy C. Sullivan , a US Park Ranger, from Virginia, held the Guinness World Record for the person most times struck by lightning. No one strike killed Sullivan. He was known as the Human Lightning Rod. Sullivan was first hit by lightning in 1942, which caused him to lose his big toenail. Over the next 35 years, lightning burned off Sullivan's eyebrows (1969), seared his left shoulders (1970), set his hair on fire (1972), struck his legs (1973), injured his ankle (1976), and burned his stomach and chest (1977). Roy C. Sullivan died in his 70's in 1983 -- not killed by lightning but by his own hand after the rejection by a woman he loved.

Saffir-Simpson Scale