Category 5 major hurricane (SSHWS/NWS) | |
---|---|
Track of Hurricane Katrina | |
Lowest pressure | 902 mbar (hPa); 26.64 inHg |
Areas affected | Bahamas, South Florida, Cuba, Louisiana (especially Greater New Orleans), Mississippi, Alabama, Florida Panhandle, most of eastern North America |
Location | 48 hour rainfall (inches) |
---|---|
Oak Grove | 6.00 |
Category 5 major hurricane (SSHWS/NWS) | |
---|---|
Hurricane Michael at peak intensity shortly before landfall on the Florida Panhandle on October 10 | |
Highest winds | 1-minute sustained: 160 mph (260 km/h) |
Lowest pressure | 919 mbar (hPa); 27.14 inHg |
Fatalities | 31 direct, 43 indirect |
Category | Wind speed | Atmospheric pressure (millibars) |
---|---|---|
1 | 74–95 mph (119–153 kph) | >979 |
Examples: Cindy and Ophelia (2005) | ||
2 | 96–110 mph (154–177 kph) | 965–979 |
Example: The Perfect Storm (1991), Hurricane Isabel (2003) |
As air is pulled into the eye of the hurricane, it draws moisture from the ocean and rises rapidly before condensing, cooling and releasing large amounts of heat into the atmosphere before falling and begins the cycle again. This refuels the hurricane, lowering the barometric pressure on the ocean surface.
While there are many factors on guidance of tropical cyclones, it is important to note that generally, these storms tend to be repelled by or blocked by high pressure systems and attracted to or follow other low pressure systems.
280 km/h
The highest classification in the scale, Category 5, consists of storms with sustained winds of at least 157 mph. … The Saffir–Simpson hurricane wind scale is based on the highest wind speed averaged over a one-minute interval 10 m above the surface.
A Category 5 has maximum sustained winds of at least 156 mph, according to this National Hurricane Center report from May 2021, and the effects can be devastating. “People, livestock, and pets are at very high risk of injury or death from flying or falling debris, even if indoors in manufactured homes or framed homes.
Category 5 Hurricane (SSHWS)
Currently, Hurricane Wilma is the strongest Atlantic hurricane ever recorded, after reaching an intensity of 882 mbar (hPa; 26.05 inHg) in October 2005; at the time, this also made Wilma the strongest tropical cyclone worldwide outside of the West Pacific, where seven tropical cyclones have been recorded to intensify …
But some Atlantic hurricanes are arguably strong enough to merit a Category 6 designation thanks to climate change. … But some Atlantic hurricanes, such as Dorian in 2019, have had sustained winds in the 185 miles-per-hour range. That’s arguably strong enough to merit a Category 6 designation.
What can cause a hurricane to weaken or get stronger? Hurricanes may lose strength over land because of cool temperatures, a lack of moisture, and/or friction. Hurricanes form over low pressure regions with warm temperatures over large bodies of water. The warm temperature causes the ocean water to evaporate.
The intensity of a hurricane is closely related to its central pressure with the lower the pressure the more intense the storm and its maximum sustained winds.
Category 5 major hurricane (SSHWS/NWS) | |
---|---|
Hurricane Katrina at peak intensity in the Gulf of Mexico on August 28 | |
Fatalities | 1,836 total |
Although Katrina made landfall as a Category 3 storm, east of downtown, the impacts were catastrophic. As it made landfall, the storm was in the process of weakening from a Category 5 storm, which in turn massively increased the hurricane wind field.
As the table below suggests, Ida, which hit New Orleans more directly than Katrina did in 2005 – and mustered greater and more concentrated destructive power – wreaked only a fraction of the loss of life and property damages.
Standard residential windows have DP values between 15 and 50. A DP 15 window can reasonably be expected to sustain winds of roughly 77 mph before shattering.
(von Storch and Woth, 2008). All coastal regions of the world where strong storms occasionally or regularly pass are affected by storm surges, which comprise most of the world’s coasts (Figure 7.2). There are two major types of storms, tropical and extratropical storms.
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