// English subtitles $FontName=Arial $FontSize=14 $HorzAlign=Center $Vertalign=Bottom $XOffset=0 $YOffset=0 $ColorIndex1=0 $ColorIndex2=1 $ColorIndex3=2 $ColorIndex4=3 $Contrast1=15 $Contrast1=0 $Contrast1=15 $Contrast1=0 $ForceDisplay=FALSE $FadeIn=3 $FadeOut=7 $TapeOffset=FALSE 00:00:00:10,00:00:03:29, 00:00:04:01,00:00:08:02, 00:00:08:03,00:00:12:04,Music 00:00:12:05,00:00:16:06,Music 00:00:16:07,00:00:20:07,Narrator: 27 storms are Arlene|to 00:00:20:08,00:00:24:08,Zeta. Lets exam what made|conditions so 00:00:24:10,00:00:28:09,favorable for Atlantic storm|formation in 2005. 00:00:28:10,00:00:32:10,We begin with the ocean; 00:00:32:11,00:00:36:10,these are sea surface|temperatures for the 2005 00:00:36:12,00:00:40:14,hurricane season, changing|through time as the calendar|advances. 00:00:40:15,00:00:44:16,Warm water powers hurricanes,|orange and 00:00:44:18,00:00:48:19,yellow areas, shows zones with|water warmer than 82 00:00:48:20,00:00:52:21,degrees; the threshold|favorable for hurricane|development. 00:00:52:23,00:00:56:23,Music 00:00:56:25,00:01:00:25,Lets start the season again, 00:01:00:27,00:01:04:26,this time adding clouds back|into the picture. 00:01:04:28,00:01:08:28,Atlantic-based hurricanes|typically form between June 00:01:08:29,00:01:12:28,and November. Hurricanes often|start as 00:01:12:29,00:01:16:29,atmospheric disturbances of the|coast of West Africa. Once out 00:01:17:00,00:01:21:02,into the warm summer waters of|the Mid-Atlantic, some ripples 00:01:21:04,00:01:25:05,begin to rotate and feeding of|off warm water strengthen into 00:01:25:06,00:01:29:08,hurricanes. Hurricanes require|warm water to heat 00:01:29:09,00:01:33:10,air above the ocean causing a|drop in air pressure. Lower 00:01:33:12,00:01:37:12,air pressures sucks more water|vapor into the storm, causing 00:01:37:14,00:01:41:14,storms to strengthen. As|hurricanes pass over warm water 00:01:41:16,00:01:45:16,they leave trails of relatively|cooler water so called, 00:01:45:17,00:01:49:17,cold water trails. Numbers|displayed over storms 00:01:49:18,00:01:53:17,tracks indicate hurricane|category changes. 00:01:53:19,00:01:57:18,Music 00:01:57:20,00:02:01:22,Music 00:02:01:23,00:02:05:25,Music 00:02:05:26,00:02:09:27,Strong shearing winds in the|troposphere can disrupt this 00:02:09:29,00:02:14:00,process weakening young storms,|but measurements indicate 00:02:14:02,00:02:18:02,that there was very little|shearing wind activity in 2005|to 00:02:18:04,00:02:22:04,impede storm formation.|Hurricanes are rare 00:02:22:06,00:02:26:06,phenomena; only about 80 or 90|appear worldwide 00:02:26:08,00:02:30:08,every year. 00:02:30:09,00:02:34:08,Music 00:02:34:10,00:02:38:10,Music 00:02:38:11,00:02:42:10,Storms 00:02:42:11,00:02:46:13,stalked the Atlantic Ocean and|Easter Seaboard from June 00:02:46:15,00:02:50:15,until early winter in 2005 and|the record books are 00:02:50:17,00:02:54:18,groaning under the strain of|such a busy year. Consider this|list of 00:02:54:20,00:02:58:20,superlatives. An average year|produces roughly 10 00:02:58:21,00:03:02:21,storms, 27 named storms formed|in 2005. 00:03:02:22,00:03:06:22,An average year produces 6|hurricanes, 00:03:06:24,00:03:10:23,15 formed in 2005. An average|year 00:03:10:25,00:03:14:24,produces two major hurricanes.|Seven formed in 00:03:14:26,00:03:18:25,2005 on average one category 5 00:03:18:26,00:03:22:25,hurricane forms every three|years. In 2005 00:03:22:26,00:03:26:27,there were three Katrina, Rita,|and Wilma. 00:03:26:28,00:03:30:29,Wilma was the most intense|Atlantic hurricane ever|recorded, 00:03:31:01,00:03:35:02,Katrina fourth, Rita sixth. But|Katrina 00:03:35:03,00:03:39:04,was the most destructive|hurricane ever to hit the|United States. The 00:03:39:05,00:03:43:05,total losses from storms in|2005 include more than 00:03:43:07,00:03:47:07,1,200 lives and potentially|more than 100 00:03:47:08,00:03:51:08,billion dollars. 00:03:51:09,00:03:55:09,Music 00:03:55:10,00:03:59:09,Music 00:03:59:10,00:04:03:12,Music 00:04:03:14,00:04:07:15,This visualization shows some|of the 00:04:07:17,00:04:11:18,actual data that NASA and NOAA|satellites measured this season. 00:04:11:20,00:04:15:21,Data used to predict the paths|and intensities of hurricanes. 00:04:15:22,00:04:19:23,Satellite data play a vital|role in helping us 00:04:19:24,00:04:23:25,understand the land, ocean, and|atmosphere systems 00:04:23:26,00:04:27:26,that have such dramatic effects|on our lives. 00:04:27:28,00:04:31:28,Music 00:04:31:29,00:04:35:28, 00:04:36:00,00:04:39:29, 00:04:40:01,00:04:43:29, 00:04:44:01,00:04:48:02, 00:04:48:04,00:04:52:05, 00:04:52:07,00:04:56:08, 00:04:56:09,00:05:00:10, 00:05:00:11,00:05:01:23,