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Typhoon Mirinae (), known in the Philippines as Typhoon Santi, was the 34th depression and the 14th typhoon in the
2009 Pacific typhoon season The 2009 Pacific typhoon season was a below average season that spawned only 22 named storms, 13 typhoons, and five super typhoons. Despite this, it was a very deadly season, with the Philippines having experienced its deadliest season in decad ...
. It came several weeks after Typhoons Ketsana and
Parma Parma (; ) is a city in the northern Italian region of Emilia-Romagna known for its architecture, Giuseppe Verdi, music, art, prosciutto (ham), Parmesan, cheese and surrounding countryside. With a population of 198,986 inhabitants as of 2025, ...
devastated the
Philippines The Philippines, officially the Republic of the Philippines, is an Archipelagic state, archipelagic country in Southeast Asia. Located in the western Pacific Ocean, it consists of List of islands of the Philippines, 7,641 islands, with a tot ...
, thus adding additional damage wrought by the two preceding typhoons.


Meteorological history

Early on October 10, 2009, the
Joint Typhoon Warning Center The Joint Typhoon Warning Center (JTWC) is a joint United States Navy – United States Air Force command in Pearl Harbor, Hawaii. The JTWC is responsible for the issuing of tropical cyclone warnings in the North-West Pacific Ocean, South P ...
(JTWC) reported that an area of convection was developing over an elongated and broad low level circulation center within a monsoon trough about 500 km, 315 miles to the southeast of
Pohnpei Pohnpei (formerly known as Ponape or Ascension, from Pohnpeian: "upon (''pohn'') a stone altar (''pei'')") is an island of the Senyavin Islands which are part of the larger Caroline Islands group. It belongs to Pohnpei State, one of the fou ...
. The low level circulation center was located under a region of favourable divergence, however it was located in area of moderate to high vertical windshear which was hampering the low level circulation centers attempts to organize. Over the next couple of days the vertical windshear relaxed and as a result convection started to develop further with a
Tropical Cyclone Formation Alert A Tropical Cyclone Formation Alert (TCFA) is a bulletin released by the U.S. Navy-operated Joint Typhoon Warning Center in Honolulu, Hawaii or the Fleet Weather Center in Norfolk, Virginia, warning of the possibility of a tropical cyclone formi ...
being issued by the JTWC late on October 25 after the
Japan Meteorological Agency The Japan Meteorological Agency (JMA; ''気象庁, Kishō-chō'') is a division of the Ministry of Land, Infrastructure, Transport and Tourism dedicated to the Scientific, scientific observation and research of natural phenomena. Headquartered ...
(JMA) had designated the disturbance as a weak tropical depression.


Preparations


Northern Mariana Islands

Early on October 26, the
National Weather Service The National Weather Service (NWS) is an Government agency, agency of the Federal government of the United States, United States federal government that is tasked with providing weather forecasts, warnings of hazardous weather, and other weathe ...
Weather Forecast Office in
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placed Guam, Rota,
Tinian Tinian () is one of the three principal islands of the Commonwealth of the Northern Mariana Islands (CNMI). Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern ...
and
Saipan Saipan () is the largest island and capital of the Northern Mariana Islands, an unincorporated Territories of the United States, territory of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Cens ...
under a tropical storm watch which meant that tropical storm force winds were possible on the islands within 48 hours. They then upgraded the watch for Rota,
Tinian Tinian () is one of the three principal islands of the Commonwealth of the Northern Mariana Islands (CNMI). Together with uninhabited neighboring Aguiguan, it forms Tinian Municipality, one of the four constituent municipalities of the Northern ...
and
Saipan Saipan () is the largest island and capital of the Northern Mariana Islands, an unincorporated Territories of the United States, territory of the United States in the western Pacific Ocean. According to 2020 estimates by the United States Cens ...
to a Tropical Storm Warning as tropical storm force winds were now expected on the islands within 24 hours. These warnings and watches were kept in force until they were cancelled early the next day after the tropical depression had moved away and intensified into a tropical storm.


Philippines


Highest Public Storm Warning Signal


Vietnam

Along with the Philippines, Vietnam was still recovering from
Typhoon Ketsana Typhoon Ketsana, known in the Philippines as Tropical Storm Ondoy, was the second-most devastating tropical cyclone of the 2009 Pacific typhoon season, causing United States dollar, $1.15 billion in damages and 665 fatalities, only behind Typho ...
, which brought the Philippine capital, Manila, its worst flooding in 40 years and went on to kill more than 160 people in Vietnam in late September, 2009. Mirinae made landfall in the coastal province of
Phu Yen Phu may refer to: Places *PHU (Polish-Hungarian Union), personal union between Poland and Hungary in 14th century. People Given name * Phu Dorjee (died 1987), first Indian to climb Mount Everest without oxygen * Phu Dorjee Sherpa (died 1969), fi ...
on November 2. More than 100 people were killed in the subsequent flooding.


Impact


Philippines

Throughout the Philippines, Mirinae killed 39 people and left roughly $100.1 million in damage."Statistical Data On Destructive Tropical Cyclones 2009" (2010), National Disaster Coordinating Council


Vietnam

Torrential rainfall produced by Mirinae in Vietnam triggered catastrophic flooding, killing total 124 people. Roughly 2,400 homes were destroyed by swift currents and 437,300 hectares of crops were flooded. Damage was counted as 5.8 trillion đồng (US$323 million).


See also

* Other tropical cyclones named Mirinae * Other tropical cyclones named Santi *
Effects of the 2009 Pacific typhoon season in the Philippines The effects of the 2009 Pacific typhoon season in the Philippines were considered some of the worst in decades. Throughout the year, series of typhoons impacted the country, with the worst damage occurring during September and October from Typhoo ...
*
Typhoon Nari (2013) Typhoon Nari (), known in the Philippines as Typhoon Santi, was a strong and deadly tropical cyclone that first struck Luzon before striking Indochina in mid October 2013. The storm was the 41st depression and the 8th typhoon in the 2013 ty ...
*
Typhoon Hagupit (2014) Typhoon Hagupit, (, ) known in the Philippines as Super Typhoon Ruby, was the second most intense tropical cyclone in 2014. Hagupit particularly impacted the Philippines in early December while gradually weakening, killing 18 people and causi ...
*
Typhoon Damrey (2017) Typhoon Damrey, known in the Philippines as Severe Tropical Storm Ramil, was a strong tropical cyclone that affected the Philippines and Vietnam during early-November 2017. Damrey first originated as a tropical depression over the Philippine arc ...


References


External links


JMA General Information
of Typhoon Mirinae (0921) from Digital Typhoon
JMA Best Track Data
of Typhoon Mirinae (0921)
JTWC Best Track Data
of Typhoon 23W (Mirinae)
23W.MIRINAE
from the U.S. Naval Research Laboratory * {{DEFAULTSORT:Mirinae (2009) 2009 Pacific typhoon season 2009 in Vietnam Santi Santi Minirae