1947 Fort Lauderdale Hurricane
From Wikipedia, the free encyclopedia
| Category 5 hurricane (SSHS) | ||
|---|---|---|
 Man dwarfed by heavy surf near Miami |
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| Formed | September 4, 1947 | |
| Dissipated | September 21, 1947 | |
| Highest winds |
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| Lowest pressure | ≤940 mbar (hPa) | |
| Damage | $110 million (1947 USD) $930 million (2000 USD)[1] | |
| Fatalities | 51 direct[2] | |
| Areas affected |
Florida, Louisiana, Mississippi | |
| Part of the 1947 Atlantic hurricane season |
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The Fort Lauderdale Hurricane (or Pompano Beach Hurricane) was an intense Category 5 hurricane that affected Florida, Louisiana, and Mississippi in September of the 1947 Atlantic hurricane season. It killed 51 people and caused $110 million (1947 US dollars) in damage.
Contents |
[edit] Storm history
The hurricane was the fourth tropical system and the third hurricane to form in the Atlantic basin during the 1947 Atlantic hurricane season. It formed as a Cape Verde-type hurricane and strengthened quickly off the coast of Africa, originating from a low-pressure system in Dakar, Senegal. Hurricane analysis suggests it achieved tropical storm status on September 4, and became a hurricane about a day later. It traveled westward along the 15th parallel, then dipped southwestward before turning northwest, slowly but steadily strengthening as it did so. Unlike most intense hurricanes, it featured a slow, even rise in strength from tropical storm status to Category 5 strength with little fluctuation in intensity. It passed north of the Bahamas and then slowed down, turned west, and continued strengthening.
By September 16 the hurricane peaked at Category 5 status north of Grand Bahama. The storm skirted over the northern portion of Abaco Island, where a weather station claimed a wind reading of 160 mph (260 km/h) (but note all such wind measurements are suspect). As the storm passed over the Gulf Stream, it lost some strength before landfall.
The storm made landfall on September 17 near Fort Lauderdale, Florida as a minimal Category 4 hurricane (the actual center crossed just south of Hillsboro Beach). Winds of hurricane force extended out roughly 120 miles from the center in all directions. [3] Wind gusts of up to 155 mph, with sustained winds in excess of 120 mph, were reported from Hillsboro Lighthouse near Pompano Beach [4]; until Hurricane Andrew in 1992, this storm held the Florida record for the highest observed wind speed; the lowest pressure reading, however, was only 27.97 inHg (947 mbar). Modern estimates suggest the pressure at landfall was probably lower at around 940 mbar. The storm proceeded due west across the peninsula, passing over Sanibel Island and out into the Gulf of Mexico.
The hurricane weakened over Florida, then continued, likely as a Category 1 storm, along a track very similar to that of Hurricane Andrew. It made landfall again in Louisiana as a Category 3 storm[5] at 6 AM CST along the coast on September 19, and in New Orleans two hours later. The eye of the hurricane passed directly over New Orleans, with gusts estimated at 125 mph (200 km/h).
[edit] Impact
[edit] Bahamas
Damage and deaths in the Bahamas are unknown.
[edit] Florida
At the storm's first landfall, an 11 foot storm surge was reported along the Florida coast. Large stretches of State Highway A1A between Palm Beach and Boynton Beach were washed out by the wave action. The Boca Raton Airport, known then as Boca Raton Army Air Field, received significant damage from the storm, reporting $4.5 million in damages. The hurricane was unusually large: some reports indicate hurricane-force winds may have extended 120 miles out from the eye center (from Cape Canaveral to Coral Gables).
At Lake Okeechobee a 20 foot (6 m) storm surge was reported along the south shore between Clewiston and Moore Haven, nearly overrunning the Herbert Hoover Dike that surrounded the lake. Unlike in the 1928 Okeechobee Hurricane, the dike held and a much larger catastrophe was prevented. However this 1947 storm inspired a further strengthening of the dike in the 1960s.
The storm was also slow-moving (about 10 mph) and dropped a prodigious amount of rain over the area - records for single-month rainfall were set in many areas, some of which still stand today (others were broken in the 1992 or 2004 seasons), and flooding was among the worst in southern Florida's history[6]. The storm killed 17 people in Florida[7].
[edit] Gulf Coast
A large part of Greater New Orleans was flooded, with two feet of water shutting down Moisant Airport and six feet of water in parts of Jefferson Parish. The storm produced an estimated 100 million US dollars worth of damage to the city[8].
A 12 foot storm surge was reported along the western half of the Mississippi coastline, causing heavy damage in Bay St. Louis (which received a 15 foot storm surge)[7], Gulfport, and Biloxi.
Although weaker at its second landfall, the hydrology of this location makes it particularly vulnerable to hurricanes. 12 people were killed in Louisiana and 22 in Mississippi[7].
[edit] Aftermath
Coming as it did shortly after the end of World War II and at the start of the Cold War, and striking an area that had recently been hit by other, even more destructive hurricanes, this hurricane was largely forgotten. Building codes and hurricane awareness had improved in Florida since the destructive hurricanes of the 1920s, limiting both damage and loss of life. Yet if this same storm were to hit today it would probably do around $11.72 billion (2004 USD) in damages[9].
[edit] See also
- List of notable tropical cyclones
- List of notable Atlantic hurricanes
- List of Category 5 Atlantic hurricanes
[edit] Notes
- ^ http://www.aoml.noaa.gov/hrd/Landsea/deadly/Table3A.htm Costliest hurricanes, 1900-2000
- ^ http://www.nhc.noaa.gov/pastdeadly.shtml NOAA/NHC deadliest hurricanes
- ^ http://www.aoml.noaa.gov/general/lib/lib1/nhclib/1947.pdf 1947 Monthly Weather Review
- ^ http://www.hurricanecity.com/city/fortlauderdale.htm Hurricanecity - Florida's hurricane history
- ^ http://www.nhc.noaa.gov/Deadliest_Costliest.shtml NOAA/NHC US hurricanes, 1851-2004
- ^ http://www.srh.noaa.gov/mfl/newpage/dade_events.html NOAA: Dade County historic weather events
- ^ a b c http://www.aoml.noaa.gov/general/lib/mgch.html NOAA: Gulf Coast hurricanes
- ^ http://www.srh.noaa.gov/lch/research/laerly20hur2.php NOAA - Louisiana hurricane history
- ^ http://www.aoml.noaa.gov/hrd/tcfaq/costliesttable3.html NOAA/NHC costliest US hurricanes (normalized)
