Homework 8: Hurricane Damage (adapted from Pipkin et al.)
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1 1 Homework 8: Hurricane Damage (adapted from Pipkin et al.) Tropical cyclones have a significant impact on coastal areas of the world. In the Atlantic and Eastern Pacific Oceans they are called hurricanes (from Hurican, the Carib god of evil), whereas similar storms in the Pacific Ocean are called typhoons. They are a significant part of global weather systems because they transfer large quantities of water and warm, moist air from equatorial regions to higher latitudes. In the Caribbean Sea, the Gulf of Mexico, and the southeastern United States, hurricanes have shaped low-lying coastal areas and, at times, have caused dramatic losses of life and property. Even with the use of orbiting weather satellites, hurricane prediction and tracking remains a major challenge for meteorologists. Hurricane Generation The hurricane season extends from June 1 to October 1 in the North Atlantic Ocean. This is because hurricanes get most of their energy from the equatorial oceans in the summer and early fall, when seawater temperatures are warmest, usually above 25 C (about 800F). Hurricanes begin as tropical waves, areas of organized clouds kilometers in diameter (Figure 81), in the eastern equatorial Atlantic. As hot air rises over the warm ocean water, the atmospheric pressure drops, and cyclonic (counterclockwise) circulation begins, with strong winds rushing toward the low pressure center. At this point the wave becomes a tropical depression. It becomes a tropical storm when winds kilometers / hour (39-74 miles/hour) develop. If winds exceed 118 kilometers/hour, the storm is called a hurricane (in the Atlantic and eastern Pacific oceans) or a typhoon (in the western Pacific Ocean). Figure 8-1 Atmospheric Waves West of Africa The airflow off of the western Africa in the tropics are unstable during the NH summer creating atmospheric depressions and sometimes hurricanes that propagate westward.
2 2 Figure 8-2 Hurricane Structure Satellite View Tropical storms and hurricanes have cyclonic or counterclockwise circulation in the Northern Hemisphere because the Coriolis effect deflects the inward air flow toward to the right. In the Southern Hemisphere, the Coriolis deflection is to the left so that cyclones in the southern tropics have clockwise rotation. Hurricane Naming Prior to 1953, hurricanes were named for the year or month of their occurrence, for the writer who described their passage, or for places sustaining severe damage, like the Galveston Hurricane of 1900 (Figure 8-3). During World War II, U.S. Navy and Army Air Corps meteorologists forecasting tropical cyclones in the Pacific Ocean began to informally give typhoons women's names, probably after their wives or girlfriends. Other naming schemes were women's names in alphabetical order, and by the international phonetic alphabet-alpha, Bravo, Charlie, Delta, Echo, Foxtrot, and so on. In 1953 the U.S. Weather Bureau began to name Atlantic hurricanes with an alphabetical sequence of female names. The current hurricane-naming method is one of alternating male and female names, such as the recent names Alberto, Beryl, Chris, Debby, and so forth. Many names have been retired to the hurricane "Hall of Fame" because their storms were so devastating-andrew, Gilbert, and Camille, and Katrina, for example. Figure 8-3 Galveston Damage The 1900 hurricane that hit Galveston Texas completely destroyed the town and killed many of the inhabitants. Measuring Hurricane Strength The strength of hurricanes is measured by the Saffir-Simpson scale (Table 8-1 and Figure 8-4), which uses minimum sustained wind speeds to categorize storms from Category 1, a minimal
3 3 hurricane, to Category 5, the most intense hurricane. Hurricane Mitch, which devastated Central America, and Hurricane Georges, which struck the coastal United States in 1998, were Category 5 events. Figure 8-4 Hurricane Saffir Simpson Category - Damage TABLE 8-1 Because hurricanes have diameters of hundreds of kilometers and may have dozens of convective storms embedded in them, they may affect coastal areas far from the main storm center. As they approach the shoreline, NOAA's Hurricane Warning Center in Miami Beach, Florida, may is-sue a hurricane watch, a 36-hour advance notice of high winds and storm surge, or a hurricane warning, which means that hurricane winds and surge are expected within 24 hours. Hurricane damage is caused by high winds, flooding, and storm surge. Surface winds can cause an abnormal rise in sea level, reaching from 1 to 6 meters above normal sea level (Figure 8-6). Along the Gulf Coast, the estimated 330 kilometer/hour winds of Hurricane Camille in 1969 caused a maximum storm surge of 8 meters, with 3-meter-high wind-driven waves atop the
4 4 surge. The end result was a l0-meter-high wall of water approaching the Mississippi coastline. Failure to evacuate caused significant loss of life. One survivor of a "hurricane party" was found floating on a sofa 8 kilometers further inland from the coastal apartment in which the party was held. Figure 8-6 Storm Surge. (top) A sea level record on Mustang Island, Texas is partitioned into the (middle) contribution of storm surge (atmospheric wind and pressure) and (bottom) astronomical (sun and moon). Note the extreme, storm surge-related high water around February 1. Not all tropical storms develop into hurricanes, and not all hurricanes develop damaging storm surge. Hurricanes tend to be cyclical; with periods during which relatively weak tropical storms impact coastlines followed by periods of stronger hurricanes. This is a dangerous sequence, because coastal residents tend to remember only the most recent tropical storm events. Hurricane development and strength may be cyclical because El Nino/Southern Oscillation events (see HW 10) may suppress tropical storms in the Atlantic Ocean, while permitting stronger storms to approach the west coast of North America. The relative strength of hurricanes can be assessed from the atmospheric pressure of each storm, measured in millibars (mb) or millimeters of mercury (mm Hg). Inches of mercury is used in aviation and in some weather reporting formats (see Table 8-2 for conversions). Minimum surface pressure, however, is not necessarily a measure of the destructive potential of a hurricane. The lowest atmospheric pressure ever measured was during Hurricane Gilbert in 1998 in the Caribbean Sea: 888 mb, which is a record low. However, Gilbert was not as destructive as some other less intense hurricanes because its landfall was onto rising terrain and into less densely populated areas of the United States and Mexico. Table 8-2 shows the 20 most intense North American hurricanes since 1900 based on atmospheric pressure in the storm cell. Table 8-3 lists the most expensive American hurricanes between 1900 and For each storm, the damage estimates have been adjusted to 1996 dollars.
5 TABLE 8-2 TABLE 8-3 5
6 Homework 8 Hurricane Damage Name EXERCISE 8-1 HURRICANE DAMAGE 1. Compare hurricane strength (storm category and atmospheric pressure) to hurricane damage using the information in Tables 8-2 and 8-3. Answer the questions on the next page. TABLE 8-2 TABLE 8-3 6
7 7 (a) Is there a relationship between hurricane strength and damage? If so, describe it. If not, why not? (b) Does a Category 5 storm always produce more damage than a Category 4 storm? Explain your answer with specific examples. (c) Is there a predictable relationship between storm damage and meteorologically measurable data (wind speed, storm category, atmospheric pressure)? If so, describe it. If not, why not? (d) What factors could produce more damage from a "weaker" hurricane? EXERCISE 8-2 HURRICANE EROSION 1. A beach profile survey was conducted prior to the landfall of a hurricane called Zeke. These data (Table 8-6) show the beach elevation (relative to mean sea level) versus the distance offshore relative to a starting point "benchmark". The post-hurricane beach profile survey data is shown in Table 8-7. Plot both profiles on the same graph, using different colors or symbols for each. Be sure to include a key telling what each color or symbol stands for.
8 8 TABLE 8-6 Table 8-7
9 (b) What effect did the hurricane have on the position of the shoreline and the profile of the beach? Where was sand eroded from, and to where was this eroded sand moved? 9
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