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Hurricane Almanac: The Essential Guide to Storms Past, Present, and Future Paperback – May 29, 2007

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Product Details

  • Paperback: 352 pages
  • Publisher: St. Martin's Griffin; Revised edition (May 29, 2007)
  • Language: English
  • ISBN-10: 0312371527
  • ISBN-13: 978-0312371524
  • Product Dimensions: 5.5 x 0.7 x 8.5 inches
  • Shipping Weight: 11.2 ounces (View shipping rates and policies)
  • Average Customer Review: 3.8 out of 5 stars  See all reviews (6 customer reviews)
  • Amazon Best Sellers Rank: #2,305,987 in Books (See Top 100 in Books)

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About the Author

Bryan Norcross is the on-air hurricane analyst for CBS News, appearing nationally on the CBS Evening News and other programs. His award-winning coverage of Hurricane Andrew in 1992 made him a national figure.

Excerpt. © Reprinted by permission. All rights reserved.

Hurricanes Today
A New Era of Hurricanes—1995–2006
Hurricanes come in cycles. A casual glance at a list of active hurricane seasons shows clusters of activity in the 1880s–1890s and 1920s-1960s, while the early twentieth century and the 1970s, 1980s, and early 1990s look relatively calm. Another active period started in 1995 and continues today.
Dramatic economic growth, immigration, increasing longevity, and other factors coincided with the hurricane downturn of the late 1960s to mid-1990s, an unfortunate and dangerous confluence of events. The effect can be seen throughout the coastal zone. Would 18 million people be living in Florida today if hurricanes had continued coming at the rate they occurred in the late 1940s and 2004 and 2005? I wonder.
Unfortunately, the people in government with the responsibility for seeing that citizens are safe during disasters were (and are) not good students of history. Most coastal areas, including the state of Florida, were developed without regard to the hurricanes of the past and without protection from the hurricanes to come. Thus, future disasters are guaranteed.
Hurricane cycles correlate with the natural fluctuation in the temperature of the ocean.
This chart compares the Atlantic Ocean water temperature to normal. The match with hurricane activity is remarkable. Notice that the late 1800s and the period from the late 1920s to the late 1960s show warmer than normal temperatures.
They were active hurricane periods as well. The swing in temperature is only about plus or minus one degree Fahrenheit, but the amount of energy that slight difference makes, when spread out over the entire Atlantic Basin, is significant. See “Global Warming and Hurricanes,” page 112.
Hurricane Season 2006
Every hurricane has its own personality, and every hurricane season does as well. The contrast between hurricane activity in 2006 and in the mega year of 2005 could not be sharper. The number of storms was down by about two-thirds, and overall tropical-cyclone activity was down dramatically as well.
Four issues came into play:
• The temperature of the ocean water
• The upper-level winds
• The amount of moisture in the atmosphere over the tropical Atlantic
• Factors we don’t understand.
Ocean temperature. The sea-surface temperatures in the tropical Atlantic were somewhat cooler in 2006 than in the superheated year before, but still much warmer than the long-term average. The water was plenty warm for hurricanes to develop.
Upper-level winds. There was a lot of talk about the upper-level winds being unfavorable for hurricane formation, and at times that was the case. But, during the heart of the hurricane season, the wind regime was no less favorable than it was in 2005 over the prime development areas. Some systems were, no doubt, “sheared” by upper-level winds, but that happens to some systems every year. Even if some of the upper winds were driven by El Niño, clearly there were other factors involved.
Dry air. The air in the mid and upper levels of the tropical Atlantic was unusually dry in 2006. A tropical system is fueled by moist air from the ocean surface rising into the midlevels of the atmosphere. If the air there is dry, however, the fueling mechanism is disrupted.
The dryness was likely caused by two mechanisms. It seemed that an unusual amount of dry Saharan air lingered over the tropical Atlantic deep into the hurricane season. Also, the wind flow created by El Niño appears to have contributed.
The upper-level winds discussed above operate in a horizontal direction, shearing the tops off systems as they try to develop. There is also a vertical component to the wind, however. The El Niño-driven rising air in the Pacific spreads across the Atlantic, then descends, creating a “circulation cell.” The descending air warms and dries as it moves lower in the atmosphere where the barometric pressure is higher.
Everyday examples of this double-barreled physical phenomenon:
• A tire pump gets hot because air heats up when it is compressed, everything else being equal.
• A hair dryer warms the air going through it. Warmer air has a greater capacity to hold water. Therefore the air coming out the nozzle acts like a bigger sponge, holding more moisture. The amount of water in the air isn’t reduced, just its percentage of the air’s maximum capacity, making the air feel drier. (This percentage is known as the “relative humidity”)
Factors we don’t understand: Even with the somewhat cooler sea-surface, El Niño-affected upper-level winds, and drier-than-normal air, the atmospheric pattern over the hurricane-development areas was not all that bad. There were times during the 2006 hurricane season when the atmosphere appeared primed for tropical development, but it didn’t happen. Clearly there are other subtle factors involved that need more study to detect and understand.
Jet-stream dip. Another player in the 2006 hurricane season was a persistent dip in the jet stream over the east coast of the United States.
The net effect of this pattern was to drive most of the significant storms to the north toward Bermuda and eventually the Maritimes of eastern Canada. Again, whether this unusually persistent dip was caused by El Niño, exacerbated by El Niño, or mostly caused by the natural randomness of weather patterns is unclear.
The net effect, however, was that the Bermuda high was much farther east than in 2005, and the steering currents kept the storms well away from the east coast.
Tropical Storm Ernesto over the Florida straits, August 29, 2006. It appeared conditions were favorable for strengthening, but subtle factors kept the system’s top winds at only 45 mph.
Tropical Storm Ernesto. The only significant storm to affect the United States was Tropical Storm Ernesto, which came ashore in the Florida Keys the evening of August 29, 2006. (One year to the day after Katrina hit New Orleans.) It was mostly a nonevent at landfall.
Ernesto’s center spent nearly twenty-four hours over the Cuban landmass, which no doubt disrupted the storm’s low-level circulation. If it had emerged into the Straits of Florida sooner and had, therefore, twelve more hours over the deep, warm water, it could have been an entirely different story in South Florida. Ernesto continued to strengthen after it moved ashore over the Florida peninsula. (The central pressure at landfall was 1004mb when it came over the Upper Keys, 1,003 mb when it made landfall on the southern tip of the peninsula, and 1,000mb when the center moved offshore near Cape Canaveral a day later.)
Subjectively, the system had a reasonably well-defined circulation during its time over the Straits, and the water was plenty warm. It appears that some dry air and some unfavorable winds impacted the system during that time; the Hurricane Hunters reported that the system was slightly tilted. The computer models indicated that Ernesto would overcome the factors and be at least a strong tropical storm at landfall, but it was not to be.
The mechanisms involved were subtle. In the end, the computer models and the National Hurricane Center had the right idea. The track was accurately forecast for the sixty hours before landfall, although before that time the forecast cone was well west of the final track. The lesson here, for most people, is that little attention should be paid to the 5-Day forecast cone (I would prefer that the NHC didn’t offer it). The 3-Day Cone is the one to pay attention to.
The intensity forecast, on the other hand, never picked up the factors inhibiting intensification. But, based on the best risk analysis that modern science could offer, hurricane warnings were issued for the southern Florida peninsula. There was a good enough chance that Ernesto would intensify that full preparation was required.
Ernesto was a reminder that sometimes—quite often actually—things turn out for the good. Every storm that comes along doesn’t blow up in to a mega monster. That fact was easy to forget after the hurricane barrage of 2004 and 2005.
Hurricane Season 2005
Anytime there are a lot of landfalling storms, let alone a record-setting season such as 2005, lessons abound—big and small. In contrast to 2006, the biggest lesson of the hurricane season of 2005 was, the worst does happen!
Hurricane Katrina reaches category 5 strength, August 28, 2005.
Hurricane Wilma reaches category 5 strength with the lowest pressure ever measured in the Atlantic Basin, October 19, 2005. Courtesy NASA.
In case after case people suffered and property was destroyed because someone—a governmental body or official, a business owner or a private citizen—decided to ignore hurricane history, ignore hurricane research, and hope for the best. But, for hour after grueling hour on television we saw that hoping does not hold back wind and water.
The two most remarkable storms of 2005 were Hurricanes Katrina and Wilma. That’s not to ignore or discount the effects of Dennis, Emily, Ophelia, Rita, Stan, Gamma, and the rest. In a normal hurricane season, any one of those storms would have been memorable. But Katrina and Wilma rose above the pack in this extraordinary season of storms.
An easy-to-forget aspect of the 2005 season was that none of the record-setting hurricanes formed in the deep tropics. Through history, most of the “great” hurricanes have formed well east of the Lesser Antilles. From there they have time to organize and gain strength. That the traditional breeding ground for big, powerful hurricanes was not fertile in 2005, and yet fifteen hurricanes formed, gives us pause.
Traditional thinking, before 2005, was that a hurricane season when the storms developed mostly on the western side of the Atlantic or in the Caribbean would likely not be as bad because, on average, they wouldn’t have as much time to develop. That’s still probably a good thought, except when the weather pattern is ideal and the water temperature is like a bath. Those factors came together in 2005.
Hurricane Katrina—Monday, August 29, 2005
Katrina was a hurricane catastrophe . . . in southern Mississippi. In Louisiana, it was a healthy hurricane hit . . . and a levee-design/engineering/debacle compounded by a FEMA fiasco . . . that led to human suffering on a scale that we have not seen in the United States in modern times. Everyone involved, from Washington to Louisiana, should be ashamed and embarrassed. We should all be disgusted with our government(s).
Katrina’s winds in New Orleans. There is little, if any, reason to think that most of New Orleans experienced more than a category 1 hurricane. For the city it was nowhere near a historic hurricane event. Here is the evidence:
• The only winds in New Orleans measured at over category 1 strength were on the far eastern side of the city. The highest was at the NASA Michoud Assembly plant fifteen miles east of downtown, where the winds were estimated to have gusted to 123 mph. The anemometer was about forty feet high. Another location nearby had a wind gust estimated at 120 mph, giving credence to the idea that these observations were probably accurate. Even using a conservative reduction factor of 20 percent to estimate the sustained winds (see page 85) occurring at the same time, we find that it’s unlikely that there were values higher than the low end of the category 2 range, if that. And remember, this is in the extreme eastern edge of the city, closest to the circulation center. All of the other measurements—although there weren’t many—were low-end category 1 or tropical storm force.
• An anemometer in the middle of Lake Pontchartrain that survived measured a peak sustained wind of 78 mph. While this may not have been the highest wind over the lake, it should be reasonably representative. And it’s low-end category 1.
• The water did not top the Lake Pontchartrain levee. Originally designed for a category 3 storm surge, the levee at its existing height would likely only withstand a category 2, according to research by a group at Louisiana State University. That levee, along with all of southern Louisiana, is sinking. So the evidence is that the storm surge rose to less than category 2 levels.
• The wind rating of the roof shingles on most of the houses in New Orleans was 60 mph. Most of the shingles stayed on.
For these reasons and more it is clear that Hurricane Katrina’s winds were not the cause of the New Orleans catastrophe.
Katrina’s storm surge in East New Orleans. New Orleans is subject to storm surges from two directions from a hurricane moving by to the east of the city. To understand what happened during Katrina, we have to look at them separately. To the east side of the city, a massive storm surge was generated by Katrina’s winds, which the day before had been 165 mph. That water was forced into the “corner” formed by the southeastern-Louisiana and southern-Mississippi coasts, and then up the Mississippi River–Gulf Outlet Canal (the MR-GO) toward the city. Under the pressure of this water, the levees on both sides of the canal failed, inundating New Orleans East and St. Bernard’s Parish. The high-speed water continued west into the Industrial Canal, where the levees also collapsed, putting the Lower Ninth Ward underwater.
The MR-GO Canal had previously been identified as a threat to the eastern part of the city. As water funnels into a narrow canal, the power of the water is accentuated, an extremely bad design in a storm-surge-prone area.
Many areas on the eastern side of New Orleans would have flooded even if the levees had not failed. There is a debate about whether the flooding would have been as bad—it would probably not have been—but it would have been devastating and deadly in any case. It has been well-known for years that this is the most vulnerable part of the city from a storm on Katrina’s track. Unless a change is made in the design of the MR-GO Canal, which aims water from the Gulf at the heart of the city, or the channel is closed, the Katrina tragedy in eastern New Orleans will be repeated.
Katrina’s storm surge from Lake Pontchartrain. Late in the morning of August 29, Katrina was moving ashore in southern Mississippi. At that time, the northerly winds on the left side of the circulation were pushing the lake water toward New Orleans, into the north-opening drainage canals, and deep into the city. The walls collapsed, with devastating results for the low-lying, northern part of the city.
The flooding should not have happened. We now know that the floodwalls failed because of faulty design and construction by the Army Corp of Engineers. As noted above, the winds pushing the water were likely in the category 1 range. The water pressure appears to have been well below the levees’ advertised specifications.
The whole thing just looks like a bad idea. These north-south canals—like the MR-GO Canal to the east—allow the powerful storm surge deep into the city. Strong floodgates should have been put at the entrance to the canals so the floodwalls wouldn’t be subject to the extreme pressures. A version of that idea is under way now as a temporary fix.
In addition, big pumps take water out of the city and push it into these canals and toward the lake—against a storm surge driven by a north wind. How could this ever work? The pumps should dump the water directly into the lake, so the pumped water is not trying to flow against the water pushed by the wind.
Amazingly, the potential of a wall failure on these north-south canals was never brought up in any seminar or conference I ever attended at which the New Orleans hurricane problem was discussed. Far more explanation is going to be required from the experts as to how this could have been overlooked.
Katrina in Mississippi. In Mississippi, Katrina was a historic hurricane. The storm surge exceeded the high-water mark from Hurricane Camille in 1969, the previous benchmark storm for that region. While Katrina was nowhere near as strong as Camille, it was a much bigger storm in physical size. Storms with a large “radius of maximum winds” generate a larger storm surge. See “Storm Surge,” page 117.
Any hurricane that produces a twenty-to-thirty-foot storm surge is going to do major damage at the coast. But at least some of the blame needs to fall on the officials in Mississippi who allowed such expensive infrastructure to be built where it was guaranteed to be ruined by any significant storm. When it came time to authorize casino gambling on the coast, Hurricane Camille apparently escaped everybody’s memory. It’s another example of government creating a policy that’s built on wishing and hoping. Government should not roll the dice. We can only hope that, once and for all, this will be enough to indelibly make the point: The worst does happen.
Mississippi building codes. In 2006, Mississippi finally got a building code, sort of. It’s not required in much of the state. Local governments are allowed to opt out, for some reason unfathomable to me. Because a city or county commission gets co-opted by outside forces, should the citizens be forced to suffer?
But, having said that, it’s a start. In Alabama they haven’t even started. It’s the only state without a state building code in the most hurricane-vulnerable region, and it’s a disgrace.
The resistance to legislation that would protect lives is, in my opinion, impossible to justify. Mississippi has not previously had state standards to protect people from fire, and there are more fire deaths there than in any other state by far. The whole thing is a sad commentary on the state of government.

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3.8 out of 5 stars
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Most Helpful Customer Reviews

3 of 3 people found the following review helpful By P. C. Nalbone on June 12, 2009
Format: Paperback
Bryan Norcross did a teriffic job with this paperback book its about 250 pages of easy reading. He writes about things like: what a hurricane is, Past storms of the years, modern storms, FAQ's. He then talks about life in a hurricane zone. He tells you things like where to park your car, where to be in your house during the storm, to evacuate or not to?, what to have on hand during the storm, what to do when winds approach certain levels. He then talks about storm surges, insurance claims, etc. He gives a summary of what a Hurricane is, and how he feels about things like Hurricane Categories 1-5, and 5 day hurricane tracks!! The book is overall a must to have for those in dangers harm, it includes several check lists of things to do, before, during and after the storm. I give this book a 4 out of 5 star scale, its GREAT!
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A meticulously written and insightful look into hurricanes and tropical storms, their history and their affect on human lives.

Written by a man who has BEEN THERE!.

The "post-mortem" on Katrina and the 2005 Hurricane Season is worth the price by itself.

Highly recommended
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By aaron karlsen on March 11, 2014
Format: Paperback Verified Purchase
This is a very complete book for hurricanes and living in a hurricane area. Only four stars because I would like an updated version.
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