Hurricane Rick (2009)
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Hurricane Rick was the third-most intense
Pacific hurricane A Pacific hurricane is a mature tropical cyclone that develops within the northeastern and central Pacific Ocean to the east of 180°W, north of the equator. For tropical cyclone warning purposes, the northern Pacific is divided into three regio ...
on record and the second-most intense tropical cyclone worldwide in 2009, only behind Typhoon Nida. Developing off the southern coast of Mexico on October 15, Rick traversed an area with favorable environmental conditions, favoring
rapid intensification In meteorology, rapid intensification is a situation where a tropical cyclone intensifies dramatically in a short period of time. The United States National Hurricane Center defines rapid intensification as an increase in the maximum sustained wi ...
, allowing it to become a hurricane within 24 hours of being declared a tropical depression. An eye began to form during the afternoon of October 16; once fully formed, the storm underwent another period of rapid strengthening. During the afternoon of October 17, the storm attained Category 5 status on the Saffir–Simpson hurricane wind scale. Several hours later, Rick attained its peak intensity as the third-strongest
Pacific hurricane A Pacific hurricane is a mature tropical cyclone that develops within the northeastern and central Pacific Ocean to the east of 180°W, north of the equator. For tropical cyclone warning purposes, the northern Pacific is divided into three regio ...
on record with winds of and a
barometric pressure Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as , which is equivalent to 1013.25 millibars, 7 ...
of 906
mbar The bar is a metric unit of pressure, but not part of the International System of Units (SI). It is defined as exactly equal to 100,000  Pa (100 kPa), or slightly less than the current average atmospheric pressure on Earth at sea lev ...
(hPa; ). After maintaining this intensity for several hours, Rick began to weaken in response to a combination of an
eyewall replacement cycle In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than , or major hurricanes ( Category 3 or above). When tropical cyclones reach this int ...
and increasing wind shear. By October 19, the storm was downgraded to a Category 3 hurricane and the following day to a tropical storm. The long-anticipated northeast turn took place near the end of this phase, also accompanied by a brief decrease in forward motion. On October 21, Rick quickly moved northeast, brushing the tip of Baja California Sur before making landfall near
Mazatlán Mazatlán () is a city in the Mexican state of Sinaloa. The city serves as the municipal seat for the surrounding '' municipio'', known as the Mazatlán Municipality. It is located at on the Pacific coast, across from the southernmost tip ...
with winds of . Several hours after moving inland, the final advisory from the NHC was issued as the storm weakened to a tropical depression and dissipated. Prior to landfall, the National Hurricane Center (NHC) initially forecast Rick to make landfall in southern Baja California as a high-end Category 2 hurricane, prompting hurricane watches. Officials ordered several hundred residents to evacuate from low-lying areas, although tropical storm warnings replaced the hurricane watches after the storm had weakened. Overall, the damage from Rick was significantly less than initially anticipated. In Mexico, three people were killed by the storm, one in Oaxaca and two in Baja California Sur.


Meteorological history

Hurricane Rick originated from a strong tropical wave that moved off the west coast of Africa on October 3, 2009. Convective activity was initially sparse as the system tracked westward across the Atlantic Ocean. By October 8, an
area of low pressure In meteorology, a low-pressure area, low area or low is a region where the atmospheric pressure is lower than that of surrounding locations. Low-pressure areas are commonly associated with inclement weather (such as cloudy, windy, with possible ...
developed within the disturbance wave and convection increased. The low eventually moved over South America and dissipated on October 11. The wave, however, remained well-defined and continued westward, entering the Pacific Ocean on October 12. By the morning of October 15, the wave began to regain convection and eventually spawned a new area of low pressure roughly south-southwest of Puerto Ángel, Mexico. By the afternoon, the NHC reported that the system had become increasingly organized and was likely to develop into a tropical depression later that day. Around 11:00 am PDT (1800  UTC), the NHC declared that the low had developed into a tropical depression, the 20th of the
2009 Pacific hurricane season The 2009 Pacific hurricane season was the most active Pacific hurricane season since 1994. The season officially started on May 15 in the East Pacific Ocean, and on June 1 in the Central Pacific; they both ended on November 30. These dates convent ...
. The storm featured well-developed outflow in all directions. Environmental conditions consisting of low
wind shear Wind shear (or windshear), sometimes referred to as wind gradient, is a difference in wind speed and/or direction over a relatively short distance in the atmosphere. Atmospheric wind shear is normally described as either vertical or horizont ...
, high moisture content and above average
sea surface temperature Sea surface temperature (SST), or ocean surface temperature, is the ocean temperature close to the surface. The exact meaning of ''surface'' varies according to the measurement method used, but it is between and below the sea surface. Air mas ...
s in the path of the system were exceptionally favorable for rapid development. Additionally, the storm was being steered through this region by a low- to mid-level ridge over Mexico. Six hours after being declared a depression, the system quickly intensified into a tropical storm, at which time it was given the name Rick. Deep convection, an early indication of an eye forming, had begun wrapping around the center of the system. Early on October 16, a ragged
eyewall The eye is a region of mostly calm weather at the center of tropical cyclones. The eye of a storm is a roughly circular area, typically in diameter. It is surrounded by the ''eyewall'', a ring of towering thunderstorms where the most severe weat ...
began to develop and several hours later, Rick intensified into a Category 1 hurricane with winds of . The rapid intensification was fueled by waters of , several degrees above average. By the evening of October 16, microwave satellite imagery depicted a well-defined eye; however, this feature was not present on infrared images. Despite this, the NHC upgraded Rick to a
Category 2 hurricane Category, plural categories, may refer to: Philosophy and general uses *Categorization, categories in cognitive science, information science and generally *Category of being * ''Categories'' (Aristotle) *Category (Kant) * Categories (Peirce) * ...
with winds now reaching . Early the next morning, the storm intensified into a
major hurricane Major (commandant in certain jurisdictions) is a military rank of commissioned officer status, with corresponding ranks existing in many military forces throughout the world. When used unhyphenated and in conjunction with no other indicators ...
, a storm that ranks as a Category 3 or higher on the Saffir–Simpson hurricane scale. The eye was clearly visible on satellite images and deep, very cold convection surrounded it, signifying a powerful cyclone. Less than 40 minutes after this upgrade, the NHC issued a special advisory stating that Rick had further strengthened into a Category 4 hurricane. Continuing to gain strength, Rick attained winds of several hours later on October 17. A possible outer eyewall, a second eye larger than the first that often forms at the beginning of an
eyewall replacement cycle In meteorology, eyewall replacement cycles, also called concentric eyewall cycles, naturally occur in intense tropical cyclones, generally with winds greater than , or major hurricanes ( Category 3 or above). When tropical cyclones reach this int ...
, was noted at this time. The eye of the storm became very well-defined and nearly cloud free, measuring roughly in diameter. In addition to the rapid intensification, Rick was also growing in size. By the afternoon hours, tropical storm-force winds extended up to from the center of the storm, with a maximum gale diameter of . At 3:10 pm PDT (2210 UTC), the NHC issued its second special advisory for Rick, this time stating that the storm had become a Category 5 hurricane, the first in the basin since
Hurricane Kenna Hurricane Kenna was the fourth-most intense tropical cyclone on record in the Eastern Pacific basin, and at the time the third-most intense Pacific hurricane to strike the west coast of Mexico. Kenna was the sixteenth tropical depression, thirte ...
in 2002. Around 8:00 pm PDT (0300 UTC on October 18), Rick attained its peak intensity as the third-strongest Pacific hurricane on record. Maximum sustained winds in the eyewall reached an estimated and the
barometric pressure Atmospheric pressure, also known as barometric pressure (after the barometer), is the pressure within the atmosphere of Earth. The standard atmosphere (symbol: atm) is a unit of pressure defined as , which is equivalent to 1013.25 millibars, 7 ...
is estimated to have bottomed out at . The pressure was not directly measured by Hurricane Hunter aircraft because the storm was too far from land at the time. Lixion Avila, a senior hurricane specialist at the NHC, described Rick's satellite presentation at this time as "spectacular." Rick maintained its peak intensity for roughly two hours between 7:00 pm and 9:00 pm PDT (0200 and 0400 UTC) on October 17, before it began to weaken in response to an eyewall replacement cycle and increasing wind shear. Throughout the day, deep convection around the eye warmed slightly and a combination of dry air and wind shear restrained the extent of the storms' outflow to the west. The combination of these factors imparted steady weakening. Later that day, Rick began to turn towards the northwest as the subtropical ridge north of the system began to weaken. Early on October 19, Rick degraded to a Category 3 hurricane as it began its approach to the southern end of the Baja California peninsula. Wind shear and dry air quickly entered the core of the system, with the eye disappearing from satellite imagery later that morning. During the evening of October 19, the center of Rick became devoid of convective activity, resulting in the NHC downgrading it to a tropical storm. According to meteorologists at the NHC, the weakening was "...almost as fast as it strengthened several days ago." The first Hurricane Hunter
reconnaissance mission In military operations, reconnaissance or scouting is the exploration of an area by military forces to obtain information about enemy forces, terrain, and other activities. Examples of reconnaissance include patrolling by troops (skirmishers, ...
into the storm took place during the afternoon of October 20. During the mission, sustained winds of and a surface pressure of were recorded. Several hours after this, convection rapidly increased, with a large area of deep convection developing northeast of the center of circulation; however, this was not associated with intensification. Around 7:00 am PDT (1400 UTC) on October 21. Tropical Storm Rick made landfall near
Mazatlán Mazatlán () is a city in the Mexican state of Sinaloa. The city serves as the municipal seat for the surrounding '' municipio'', known as the Mazatlán Municipality. It is located at on the Pacific coast, across from the southernmost tip ...
with winds of . Following landfall, the storm rapidly weakened to a tropical depression and roughly seven hours after moving inland, the surface circulation of Rick dissipated over the high terrain of Mexico.


Preparations

Officials in
Oaxaca Oaxaca ( , also , , from nci, Huāxyacac ), officially the Free and Sovereign State of Oaxaca ( es, Estado Libre y Soberano de Oaxaca), is one of the 32 states that compose the political divisions of Mexico, Federative Entities of Mexico. It is ...
shut down beaches and warned people not to venture out into the water. Residents were advised of potentially heavy rainfall. Along coastal areas of Mexico, specifically around Acapulco, officials closed ports to small crafts due to rough seas. Residents around the city were also warned about the possibility of mudslides from heavy rain associated with the cyclone's
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