{{Short description|Pacific typhoon in 2010}} {{About|the 2010 typhoon|other storms of the same name|List of storms named Chanthu|and|List of storms named Caloy}} {{Infobox weather event | name = Typhoon Chanthu (Caloy) | image = Chanthu Jul 22 2010 0325Z.jpg | caption = Typhoon Chanthu at peak intensity near landfall in Guangdong on July 22 | formed = July 17, 2010 | dissipated = July 23, 2010 }}{{Infobox weather event/JMA | winds = 70 | pressure = 970 }}{{Infobox weather event/JTWC | basin = wpac | winds = 80 | pressure = 963 }}{{Infobox weather event/Effects | year = 2010 | fatalities = 27 total | damage = 817700000 | areas = Luzon, Guangdong }}{{Infobox weather event/Footer | season = 2010 Pacific typhoon season }} '''Typhoon Chanthu''', known in the Philippines as '''Tropical Storm Caloy''', was a weak typhoon that impacted southeastern China in the 2010 Pacific typhoon season. The storm formed on July 17, slowly moving to the Philippines, making direct landfall in Aurora. The storm later was later named respectively as Caloy and Chanthu. The storm later made its way to China, where the storm had its peak intensity. The storm later dissipated on July 23.

As a result of the storm, there was heavy rainfall and flooding in the affected areas. In the Philippines, eight people died, with hundreds of stranded residents. In China, 9 people were killed, with a CNY 5.54 billion (US$817.7 million) loss. In Vietnam, 10 people died, with infrastructure damaged.

==Meteorological history== {{storm path|Chanthu 2010 track.png}} Early on July 17, the JMA reported that a tropical depression had developed about 220&nbsp;km (135&nbsp;mi) to the northeast of Manila, Philippines.<ref>{{cite web |date=2010-07-17 |title=JMA WWJP25 Advisory 2010-07-17 00z |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd.txt |url-status=unfit |archiveurl=https://web.archive.org/web/20100729000637/http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archivedate=July 29, 2010 |accessdate=2010-07-17 |publisher=Japan Meteorological Agency}}</ref> Later that day the JTWC reported that the depression had a small low level circulation center with deep convection flaring to the northeast of the center with an unfavorable environment.<ref name=":0">{{Cite web |date=17 July 2010 |title=Significant Weather Advisory for the Western/South Pacific Oceans |url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |archive-url=https://www.webcitation.org/5rHm1LNhv?url=http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/ab/abpwweb.txt |url-status=dead |archive-date=2010-07-17 |access-date=2 September 2024}}</ref> Also spotting dense fog within the Sea of Okhotsk.<ref>{{Cite web |title=Warning and Summary 170000 |url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |archive-url=https://www.webcitation.org/5rHUL4Fmc?url=http://weather.noaa.gov/pub/data/raw/ww/wwjp25.rjtd..txt |url-status=dead |archive-date=2010-07-17 |access-date=2 September 2024}}</ref> However, as the low-level circulation center was located close to land and was not very organized, the JTWC declared that there was a poor chance of it becoming a significant tropical cyclone within 48 hours.<ref name=":0" /> However, during that day, the depression rapidly consolidated with an anticyclone helping to develop the low-level circulation center. As a result, early the next day the JTWC issued a tropical cyclone formation alert on the depression, however they thought that further development might be hindered as it was located close to land.<ref>{{Cite web |date=17 July 2010 |title=Significant Weather Advisory for the Western and South Pacific Oceans Reissued |url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |archive-url=https://www.webcitation.org/5rIWgAzGs?url=http://weather.noaa.gov/pub/data/raw/ab/abpw10.pgtw..txt |url-status=dead |archive-date=2010-07-17 |access-date=2 September 2024}}</ref> Whilst it moved along the southern edge of the subtropical ridge, the Depression made landfall in Aurora province at 0600&nbsp;UTC,<ref name=":1">{{cite web |author=Philippine Atmospheric, Geophysical and Astronomical Services Administration |date=2010-07-17 |title=Shallow Low Pressure Area Weather Advisory One |url=http://ndcc.gov.ph/attachments/053_SLPA%20for%20July%20as%20of%2017%20July.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110823015922/http://ndcc.gov.ph/attachments/053_SLPA%20for%20July%20as%20of%2017%20July.pdf |archive-date=23 August 2011 |accessdate=2010-07-17 |publisher=National Disaster Coordinating Council}}</ref> before the JTWC initiated advisories later that morning, as the low-level circulation center had consolidated and poleward outflow into the tropical upper tropospheric trough had improved.<ref>{{Cite web |date=18 July 2010 |title=Tropical Cyclone Formation Alert |url=http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |archive-url=https://www.webcitation.org/5rJ2fgH47?url=http://weather.noaa.gov/pub/data/raw/wt/wtpn21.pgtw..txt |url-status=dead |archive-date=2010-07-18 |access-date=2 September 2024}}</ref><ref name=":4">{{Cite web |title=Digital Typhoon: Typhoon 201003 (CHANTHU) - General Information (Pressure and Track Charts) |url=http://agora.ex.nii.ac.jp/digital-typhoon/summary/wnp/s/201003.html.en |access-date=2024-09-04 |website=agora.ex.nii.ac.jp}}</ref>

As the storm moved to the Philippine Area of Responsibility, the storm was named ''Caloy'' by PAGASA. Then. on July 19, PAGASA issued their last advisory on Tropical Storm Caloy as it had moved out of their Area of Responsibility.<ref>{{Cite web |date=19 July 2010 |title=Severe Weather Bulletin Number ONE |url=http://dynasmon.fortunecity.com/PAGASA.html |archive-url=https://www.webcitation.org/5rKEELvVr?url=http://dynasmon.fortunecity.com/PAGASA.html |url-status=dead |archive-date=2010-07-18 |access-date=2 September 2024}}</ref> Then, the storm was officially named ''Chanthu'' by the Regional Specialized Meteorological Centre.{{efn|The name ''Chanthu'' (Khmer: ច័ន្ធូ, [[Help:IPA/Khmer|[can.ˈtʰuː]]]) was contributed by Cambodia and means tuberose (''Polianthes tuberosa'') in Khmer.<ref>{{Cite web |date= |title= List of names for tropical cyclones adopted by the ESCAP/WMO Typhoon Committee for the western North Pacific and the South China Sea (valid as of 2025) |url=https://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/tyname.html |access-date=March 16, 2026 |website=Japan Meteorological Agency}}</ref>}}<ref>{{Cite web |date=19 July 2010 |title=RSMC Tropical Cyclone Advisory |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-url=https://www.webcitation.org/5rLF5Ezab?url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |url-status=dead |archive-date=2010-07-19 |access-date=2 September 2024}}</ref> Later, Chanthu began to head to China, where it peaked as a Category 1 typhoon.<ref>{{Cite web |date=22 July 2024 |title=RSMC Tropical Cyclone Advisory |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-url=https://www.webcitation.org/5rPGpuwpk?url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |url-status=dead |archive-date=2010-07-22 |access-date=2 September 2024}}</ref> It made landfall in China and soon dissipated hours later.<ref>{{Cite web |date=23 July 2010 |title=RSMC Tropical Cyclone Advisory |url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |archive-url=https://www.webcitation.org/5rQoh4ABN?url=http://weather.noaa.gov/pub/data/raw/wt/wtpq21.rjtd..txt |url-status=dead |archive-date=2010-07-23 |access-date=2 September 2024}}</ref><ref name=":4" />

== Preparations and impact ==

=== Philippines === Before the storm hit Aurora, a report was issued by the National Disaster Coordinating Council to let Local Government Units (more so those near the affected areas) to keep an eye on the storm.<ref name=":1" />

In Luzon, heavy rains triggered floods that destroyed at least one house and stranded thousands of people. Eight people were killed in the Philippines. Throughout Aurora, heavy rains triggered flash flooding which destroyed at least one home and stranded hundreds of residents. The Paltic barangay, within Dingalan, became inaccessible to rescuers after the local river topped its banks and washed out nearby slopes.<ref>{{cite web |date=2010-07-18 |title=Effects of Active Low Pressure Area in Aurora Province |url=http://ndcc.gov.ph/attachments/054_SITREP%20Effects%20of%20ALPA%2018July%2011pm.pdf |publisher=National Disaster Coordinating Council}}</ref> Following the system's development, PAGASA stated that rainfall from system could trigger landslides and flooding in Aurora, the Bicol Region, and Quezon.<ref>{{Cite web |date=17 July 2010 |title=NDCC Advisory Number 01 |url=http://ndcc.gov.ph/attachments/053_SLPA%20for%20July%20as%20of%2017%20July.pdf |url-status=dead |archive-url=https://web.archive.org/web/20110823015922/http://ndcc.gov.ph/attachments/053_SLPA%20for%20July%20as%20of%2017%20July.pdf |archive-date=23 August 2011 |access-date=4 September 2024 |website=National Disaster Coordinating Council}} [http://ndcc.gov.ph/attachments/053_SLPA%20for%20July%20as%20of%2017%20July.pdf Alt URL]</ref>

=== China === On July 28, the Chinese government advised residents to stay indoors. Meteorologists also braced for heavy flooding and rainfall.<ref name=":2">{{Cite web |date=2010-07-28 |title=China : Officials fear floods, strained reinforcements - China {{!}} ReliefWeb |url=https://reliefweb.int/report/china/china-officials-fear-floods-strained-reinforcements |access-date=2024-09-03 |website=reliefweb.int |language=en}}</ref> The government also evacuated people from coast-lying areas, including ports. Other than rainfall, the government is also concerned for the Yangtze, which has experienced heavy flooding, with floodgates opening.<ref>{{Cite web |title=Typhoon Chanthu weakens as it makes landfall in southern China - CNN.com |url=https://edition.cnn.com/2010/WORLD/asiapcf/07/22/china.typhoon/index.html |access-date=2024-09-03 |website=www.cnn.com |language=en}}</ref> A total of 3 million people had to be evacuated because of the storm.<ref>{{Cite web |title=China fears floods as typhoon hits |url=https://www.aljazeera.com/news/2010/7/22/china-fears-floods-as-typhoon-hits |access-date=2024-09-04 |website=Al Jazeera |language=en}}</ref> In China, The Xinhua State news reported that two people were killed by walls that were blown over by strong gales.<ref name=":3" /> The typhoon made landfall in Hainan, killing two people.<ref name=":2" /> The typhoon later made landfall near the city of Wuchuan. State-run television broadcast images of large waves crashing on to the Guangdong shore, trees flattened by wind and electric poles collapsed onto streets under heavy rain.<ref name=":3">[https://news.yahoo.com/s/afp/20100722/wl_asia_afp/chinaweatherfloods Typhoon Chanthu lashes flood-hit China], July 22, 2010.</ref> Thereafter heavy flooding swept away a 50-year-old man in a village in Hong Kong.<ref>[http://www.newstime.co.za/WorldNews/Typhoon_Chanthu_kills_3_becomes_Tropical_Storm_heading_North_/8145/ Typhoon Chanthu kills 3 becomes Tropical Storm heading North]</ref> The southern Chinese provinces of Guangdong and Hainan braced themselves, ahead of Typhoon Chanthu's expected landfall. Guangdong meteorological authorities, have launched the highest level of disaster response.<ref>[http://english.cntv.cn/program/newshour/20100722/103103.shtml Reporter: Impact of tropical storm Chanthu] July 22, 2010</ref> In all, 9 people were killed in South China, and total economic losses were counted to be CNY 5.54 billion (US$817.7 million).<ref>{{cite web|title="灿都"致3省9人死亡600万人受灾|url=http://news.weather.com.cn/809420.shtml|date=July 30, 2010|publisher=中国天气网}}</ref>

=== Vietnam === The storm triggered heavy rainfall in Vietnam, with an estimated amount of {{Convert|63-67|mm|in}} in the Lào Cai province. The rain also destructed infrastructure, injuring three people, and blocking a line, which caused a traffic jam. In the Yên Bái province, 13 houses were destroyed by the storm. The major Duong floating bridge was also removed because of high floods in the Đuống River.<ref>{{Cite web |date=2010-07-28 |title=Viet Nam: Flood surges in northern provinces - Viet Nam {{!}} ReliefWeb |url=https://reliefweb.int/report/viet-nam/viet-nam-flood-surges-northern-provinces |access-date=2024-09-03 |website=reliefweb.int |language=en}}</ref> A total of 10 people died in Vietnam, with 7 fatalities in Hà Giang province, 2 in the Cao Bằng province, and 1 in the Lao Cai province. In the Bắc Giang province, 10 communes were isolated and {{Convert|44,100|ha|sqmi}} of destroyed rice crops. Also, in Yên Bái province, {{Convert|18|ha|sqmi}} of rice was damaged while {{Convert|5|ha|sqmi}} of fishponds were damaged.<ref>{{Cite web |date=2010-07-26 |title=Viet Nam: Storm Chanthu claims 10 lives in north - Viet Nam {{!}} ReliefWeb |url=https://reliefweb.int/report/viet-nam/viet-nam-storm-chanthu-claims-10-lives-north |access-date=2024-09-03 |website=reliefweb.int |language=en}}</ref>

== Aftermath == After 700 flooding deaths and multiple storms, the Chinese government added flood reinforcements for thousands of reservoirs in China. "The central government is planning to reinforce all the small reservoirs, with a special safety official in charge, and enough money for maintenance," said Zhou Xuewen, head of the planning department with the Ministry of Water Resources.<ref>{{Cite web |date=2010-07-28 |title=China : Officials fear floods, strained reinforcements - China {{!}} ReliefWeb |url=https://reliefweb.int/report/china/china-officials-fear-floods-strained-reinforcements |access-date=2024-09-02 |website=reliefweb.int |language=en}}</ref>

== See also == {{Portal|Tropical cyclones}} *Typhoon Mujigae - Had a similar track but was more intense when striking Guangdong

== Notes == {{notelist}}

== References == {{Reflist}}

== External links == {{Sister project links|display=Typhoon Chanthu |wikt=no |commons=Category:Typhoon Chanthu (2010) |b=no |n=Typhoon kills two in southern China |q=no |s=no |v=no}} *[http://agora.ex.nii.ac.jp/digital-typhoon/summary/wnp/s/201003.html.en JMA General Information] of Typhoon Chanthu (1003) from Digital Typhoon *The JMA's [http://www.data.jma.go.jp/fcd/yoho/data/typhoon/T1003.pdf Best Track Data] on Typhoon Chanthu (1003) {{in lang|ja}} *The JMA's [http://www.data.jma.go.jp/fcd/yoho/data/typhoon/T1003.png RSMC Best Track Data (Graphics)] on Typhoon Chanthu (1003) *The JMA's [http://www.jma.go.jp/jma/jma-eng/jma-center/rsmc-hp-pub-eg/besttrack.html RSMC Best Track Data (Text)] *The JTWC's [https://web.archive.org/web/20110410011415/http://www.usno.navy.mil/NOOC/nmfc-ph/RSS/jtwc/best_tracks/2010/2010s-bwp/bwp042010.txt Best Track Data] on Typhoon 04W (Chanthu) *[https://archive.today/20140805213949/http://www.nrlmry.navy.mil/tcdat/tc10/WPAC/04W.CHANTHU/ 04W.CHANTHU] from the U.S. Naval Research Laboratory

{{2010 Pacific typhoon season buttons}}

{{DEFAULTSORT:Chanthu (2010)}} Category:2010 disasters in the Philippines Category:Typhoons in the Philippines Category:2010 Pacific typhoon season Category:Typhoons in Vietnam Category:Typhoons in China Category:Typhoons in Hong Kong Chanthu