Hurricane Norman (1978)

Hurricane Norman
Category 4 major hurricane (SSHWS/NWS)

Hurricane Norman at peak intensity
Formed August 30, 1978
Dissipated September 6, 1978
Highest winds 1-minute sustained: 140 mph (220 km/h)
Fatalities 4 indirect, 17 missing
Damage $300 million (1978 USD)
Areas affected California, Nevada, Arizona
Part of the 1978 Pacific hurricane season

Hurricane Norman was the most recent tropical system to make landfall in California. The 14th named storm, 11th hurricane and 6th major hurricane of the 1978 Pacific hurricane season, Norman evolved from a tropical disturbance noted 400 mi (640 km) southeast of Acapulco on the afternoon of August 29. The system moved westward and developed into a tropical depression on August 30. Modest strengthening ensued, and the cyclone became a tropical storm that evening and a hurricane on the evening of August 31 as it turned to the west-northwest. Late on the night of September 1, Norman became a major hurricane with a 40-mile-wide eye, and a nearby ship reported seas of 41 ft (12 m). The center grazed the northeast side of Socorro Island on the afternoon of September 2. Moving over cooler waters west of Baja California, the cyclone slowly weakened. By early on September 4, moisture from the hurricane spread north into California initiating rains in the Golden State. A developing trough to its west caused the initial influx of moisture and Norman's turn to the north as a weakening tropical storm. Eventually turning north-northeast towards southern California, the cyclone did eventually turn north-northeast towards southern California, and the cyclone weakened to a tropical depression as it passed the 30th parallel. Hurricane Norman made landfall in California on September 5, as a minimal tropical depression. The tropical cyclone became a remnant low shortly after California landfall, and the final advisory was issued at 00:00 GMT, on September 6. Over 7.01 in (178 mm) of rain occurred in the Sierra Nevada range.[1] Rare snowfall was also reported.

Meteorological history

Map plotting the track and intensity of the storm according to the Saffir–Simpson scale

This system evolved from a tropical disturbance noted 400 miles southeast of Acapulco on the afternoon of August 29th. The system moved westward and developed into a tropical depression on the 30th. Modest strengthening ensued, and the cyclone became a tropical storm that evening and a hurricane on the evening of the 31st as it turned to the west-northwest.

Late on the night of the 1st Norman became a major hurricane with a 40-mile-wide eye, and a nearby ship reported seas of 41 feet. The center grazed the northeast side of Socorro Island on the afternoon of the 2nd. Moving over cooler waters west of Baja California, the cyclone slowly weakened.

By early on September 4 moisture from the hurricane spread north into California initiating rains in the Golden State. A developing trough to its west caused the initial influx of moisture and Norman's turn to the north as a weakening tropical storm. Eventually turning north-northeast towards southern California, the cyclone did eventually turn north-northeast towards southern California, and the cyclone weakened to a tropical depression as it passed the 30th parallel.[2] Hurricane Norman made landfall in California on September 5, as a minimal tropical depression. The tropical cyclone became a remnant low shortly after California landfall, and the final advisory was issued at 00:00 GMT, on September 6.[3][4]

The hurricane's strongest winds came at 120 mph (190 km/h). These winds occurred on September 3 approximately 900 kilometers off the coast of Jalisco, Mexico. Hurricane Norman caused an increase in precipitation throughout the Rocky Mountains.[5][6]

Preparations and impact

Rainfall stats for Norman

A flash flood watch was issued for the mountainous terrain and the desert region from Kern County to the California-Mexico border by the National Weather Service.

Several inches of rain was produced, with over 7.01 in (178 mm) of rain occurred in the Sierra Nevada range at Lodgepole in Sequoia National Park.[1] Rainfall was most intense on September 5 and September 6 with amounts exceeding 3 in (76 mm) in the mountains of southern California.[7] In addition, Norman produced waves up to 15 feet (180 in) high.[8] The extratropical remains of Hurricane Norman also moved into Nevada produced very significant amounts of rainfall in the extreme central to northern portion of the state.[9] Power lines were knocked down, and caused a brief power failure from Santa Barbara to San Diego, reported by the Los Angeles Department of Water and Power, the Southern California Edison and the San Diego Gas and Electric.[8] The high winds tossed about ships in local harbors and damaging agricultural crops in Southern California, such as raisin crops, and damage to raisins were extensive throughout Kern, Tulare, and Stanislaus Counties. The rainfall also damaged grapes and other varieties of grapes. Over 1,500 people had to be rescued due to high waves. A 25-foot, $15,000 cruiser was smashed and destroyed when a surf 150 foot from ashore came at Dana Point.[1] Rare late summer snow was also reported in some areas of the Sierra (especially Mt. Whitney), and the blizzard killed at least four people, and at least seventeen others were missing. It dumped at least 5 inches (130 mm) of snow to many hiking areas. The storm also produced surging tides at the Los Angeles Harbor, and swept a 10,000-ton tanker from its moorings.[10] Many search and rescue teams in Inyo County went on a search, and many hikers had to be rescued. At least three hikers that were reported missing in the Italy Lake area had to be rescued.[11] The tropical cyclone had managed to cause $300 million (1978 USD) in damages.[12]

See also

References

  1. 1 2 3 "Hurricane Norman - August 30-September 6". Hydrometeorological Prediction Center. Retrieved 2013-06-02.
  2. ↑ "Hurricane NORMAN". National Oceanic and Atmospheric Administration. 1978.
  3. ↑ Emil B. Guther (1978). "Tropical cyclones of the 1978 Pacific hurricane season".
  4. ↑ Emil B. Guther (1979). "Tropical cyclones of the 1978 Pacific hurricane season". Eastern Pacific Hurricane Center. Bibcode:1979MWRv..107..911G. doi:10.1175/1520-0493(1979)107<0911:ENPTCO>2.0.CO;2. Retrieved 2013-06-02.
  5. ↑ "Unisys Weather". Retrieved February 1, 2016.
  6. ↑ Taubensee, Robert (December 1978). "WEATHER AND CIRCULATION OF SEPTEMBER 1978". MONTHLY WEATHER REVIEW. Retrieved February 2, 2016.
  7. ↑ Jack Williams (May 17, 2005). "Hurricanes in the Western US". USA TODAY. Retrieved 2011-12-02.
  8. 1 2 United Press International (1978-09-05). "Los Angeles Braced For Storm's Remnants". Ellensburg Daily Record. Retrieved 2011-12-02.
  9. ↑ Associated Press (1978-09-06). "Tropical Storm Weaker". The Victoria Advocate. Retrieved 2013-06-02.
  10. ↑ Associated Press (1978-09-07). "Summer Snow Brings Death To Four Hikers". The Day. Retrieved 2013-06-02.
  11. ↑ Associated Press (September 7, 1978). "California Snow Storm Kills Hikers". Williamson Daily News.
  12. ↑ Brian Maher and Jack Beven. "The Costliest Hurricanes In The United States 1900-1996". National Oceanic and Atmospheric Administration. Retrieved 2013-06-01.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.