Hurricane Hilary (2011)

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Saffir–Simpson scale
  Tropical depression (≤38 mph, ≤62 km/h)
  Tropical storm (39–73 mph, 63–118 km/h)
  Category 1 (74–95 mph, 119–153 km/h)
  Category 2 (96–110 mph, 154–177 km/h)
  Category 3 (111–129 mph, 178–208 km/h)
  Category 4 (130–156 mph, 209–251 km/h)
  Category 5 (≥157 mph, ≥252 km/h)
  Unknown
Storm type
Disc Plain black.svg Tropical cyclone
Solid black.svg Subtropical cyclone
ArrowUp.svg Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

On September 7, a tropical wave moved off the coast of Africa. [1] During the nighttime hours of September 18, an area of showers and thunderstorms associated with a broad area of low pressure was observed a couple of hundred miles south-southeast of the Gulf of Tehuantepec as it moved westward. [2] The following day, the area of disturbed weather began to become better organized, and the National Hurricane Center (NHC) upgraded its chances of tropical cyclone development to the "Medium" category. [3] Moving towards the west-northwest, the area of disturbed weather was upgraded into a tropical depression during the morning hours of September 21, after radar data showed that the low pressure area had gained enough structure to be declared as such. [4] Due to a favorable upper regime characterized by low wind shear and a moist environment, the National Hurricane Center predicted intensification into a hurricane within two days. [5] Later on September 21, despite the fact that rainbands on the western semicircle of the depression became less defined, the depression acquired gale-force winds, and was subsequently upgraded into a tropical storm, earning the name Hilary. [6] That afternoon, the Government of Mexico issued a tropical storm watch for parts of the Mexican coastline, indicating that rainfall totals of 3–5 inches, with isolated 10 inch amounts, were possible. [7]

On September 22, while quickly strengthening, Hilary was upgraded to a Category 1 hurricane on the Saffir-Simpson hurricane scale. It was noted by the National Hurricane Center that strengthening into a major hurricane, defined by a hurricane with winds that exceed 111 miles per hour (179 km/h), was likely over the coming days. Just several hours later, Hilary was recorded as a rapidly strengthening Category 2 hurricane located nearby the Mexican coastline. [8] At 00:00 UTC September 23, Hilary was upgraded into a major hurricane, the fourth of the season. Continuing to rapidly strengthen, Hilary became a Category 4 hurricane just a few hours later after becoming a Category 3, and reached a peak intensity of 145 mph (235 km/h) at 0600 UTC September 23 (11 p.m. AST September 22). However, the storm began to enter an area of higher wind shear and cooler ocean temperatures on September 24, and Hilary began to weaken. The hurricane weakened back down to a Category 3 hurricane early on September 25, but was later upgraded briefly to a Category 4 again the following afternoon. [9] [10]

Hurricane Hilary at its secondary peak strength on September 26 Hurricane Hilary Sept 26 2011 2035Z.jpg
Hurricane Hilary at its secondary peak strength on September 26

Several hours later, the storm was once again downgraded into a Category 3 hurricane, and during the afternoon hours of September 27, Hilary was further downgraded into a Category 2 hurricane. Early on the following morning, Hilary weakened into a Category 1 hurricane, before weakening further into a tropical storm on September 28. [11] Losing a lot of its convection on September 30, the National Hurricane Center noted that Hilary had weakened into a tropical depression. Several hours later, after sustaining no deep convection atop its center, Hilary was declared a remnant low, located several hundred miles away from any landmasses. Over the next 3 days, Hilary's remnant low subsequently moved towards the southwest, before dissipating after 1200 UTC on October 3, about 1,050 mi (1,690 km) to the west of the southern tip of Baja California. [1]

Preparations and impact

The NHC noted the possibility of up to 10 in (250 mm) of rain in the high-terrain of Guerrero and Oaxaca, and large swells were expected to impact coastal areas. Tropical cyclone watches and warnings were therefore issued for portions of the Pacific coast of Mexico. [12] A red emergency alert was additionally in place for the region; officials urged residents to be prepared to evacuate, and tourists were advised to stay indoors.[ citation needed ] Due to rough surf, small craft advisories were put in effect, and swimmers were advised to take extreme caution. [13] The port of Acapulco was closed for small vessels, and a moderate to high alert for strong winds and rain was noted. [14]

The storm's outer bands produced torrential rains over Chiapas and Tabasco, with 24-hour accumulations of up to 8.58 in (218 mm) in Tabasco. [15] Also in the state, four rivers overflowed their banks; one river received 51 in (1,300 mm) of excess water in a single day. Low-lying areas, such as grasslands and pastures, experienced major flooding, prompting farmers to evacuate their livestock. In Villahermosa, the downpours resulted in the collapse of water drains, flooding many streets and stranding cars. [16] Across Guerrero, three people were initially reported missing, but all three were later found. Twenty-thousand residents were advised to evacuated due to rising floodwaters. [17] [18] Offshore Colima, large waves of 9 ft (2.7 m) to 15 ft (4.6 m) high were recorded. [16]

See also

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References

  1. 1 2 3 Beven, John (Jack) L; Landsea, Christopher W; National Hurricane Center (January 20, 2012). Hurricane Hilary 2011 (PDF) (Tropical Cyclone Report). National Oceanic and Atmospheric Administration's National Weather Service. Retrieved July 19, 2012.
  2. ↑ Pasch, Richard. "Graphical Tropical Weather Outlook". National Hurricane Center. Retrieved September 30, 2011.
  3. ↑ Cangialosi, John. "Graphical Tropical Weather Outlook". National Hurricane Center. Retrieved September 30, 2011.
  4. ↑ Brown, Daniel. "Tropical Depression Nine-E Public Advisory #1". National Hurricane Center. Retrieved September 30, 2011.
  5. ↑ Brown, Daniel. "Tropical Depression Nine-E Discussion #1". National Hurricane Center. Retrieved September 30, 2011.
  6. ↑ Cangialosi, John. "Tropical Storm Hilary Public Advisory #2". National Hurricane Center. Retrieved September 30, 2011.
  7. ↑ Cangialosi, Pasch, John, Richard. "Tropical Storm Hilary Public Advisory #3". National Hurricane Center. Retrieved September 30, 2011.{{cite web}}: CS1 maint: multiple names: authors list (link)
  8. ↑ Cangialosi, Pasch, John, Richard. "Hurricane Hilary Public Advisory #7". National Hurricane Center. Retrieved September 30, 2011.{{cite web}}: CS1 maint: multiple names: authors list (link)
  9. ↑ Brennan, Michael. "Hurricane Hilary Public Advisory #17". National Hurricane Center. Retrieved September 30, 2011.
  10. ↑ Brennan, Michael. "Hurricane Hilary Public Advisory #23". National Hurricane Center. Retrieved September 30, 2011.
  11. ↑ Brown, Daniel. "Tropical Storm Hilary Public Advisory #32". National Hurricane Center. Retrieved September 30, 2011.
  12. ↑ "Hurricane forms off Mexico's Pacific coast". Univison. September 22, 2011. Archived from the original on March 23, 2012. Retrieved September 23, 2011.
  13. ↑ "Tropical Storm Hillary intensifies into Category 1 status". Guerro Department of Public Safety. September 22, 2011. Archived from the original on July 20, 2012. Retrieved September 23, 2011.
  14. ↑ "Moderate to strong Potential occurrence of rainfall and conditions of the Hurricane "Hilary" category II". Guerro Department of Public Safety. September 22, 2011. Archived from the original on July 13, 2012. Retrieved September 23, 2011.
  15. ↑ "'Hilary' evoluciona a huracán y manda lluvias a Tabasco" (in Spanish). Tabasco Hoy. September 22, 2011. Archived from the original on September 30, 2011. Retrieved September 23, 2011.
  16. 1 2 "Call for extreme measures to strengthen "Hilary" The category four hurricane rains and waves generated". El Universal. September 23, 2011. Retrieved September 23, 2011.
  17. ↑ "Tres desaparecidos e inundaciones deja huracán Hilary en Guerrero". Periodico Digital. September 23, 2011. Archived from the original on February 21, 2013. Retrieved September 23, 2011.
  18. ↑ "Localizan a los 3 pescadores de Guerrero, flotaban sobre bidones". excelsoir.com. September 23, 2011. Retrieved September 23, 2011.

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Hurricane Hilary
Hilary 2011-09-23 2000Z.jpg
Hilary at peak intensity on September 23
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