Tropical Storm Linfa (2009)

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Severe Tropical Storm Linfa
Severe Tropical Storm Linfa near peak intensity on June 20
Meteorological history
FormedJune 14, 2009
ExtratropicalJune 22, 2009
DissipatedJune 29, 2009
Severe tropical storm
10-minute sustained (JMA)
Highest winds110 km/h (70 mph)
Lowest pressure975 hPa (mbar); 28.79 inHg
Category 1-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds140 km/h (85 mph)
Lowest pressure967 hPa (mbar); 28.56 inHg
Overall effects
Fatalities7 direct
Missing6
Damage$105 million (2009 USD)
Areas affectedPhilippines, Taiwan, China, Japan, Russia
IBTrACSEdit this at Wikidata

Part of the 2009 Pacific typhoon season

Severe Tropical Storm Linfa was the second

Fujian Province, China
as a tropical storm before weakening to a tropical depression.

In

¥641 million (US$93.8 million) and agricultural losses in Taiwan reached NT$
400 million (US$12.1 million).

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale
Map key
  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
triangle Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

On June 10, the Joint Typhoon Warning Center (JTWC) began monitoring a persistent area of convection situated about 140 kilometres (85 mi) southeast of Palau. Satellite imagery depicted an elongated low-level circulation with deep convection centered along the southwestern portion of the system. Strong wind shear, which normally inhibits cyclonic development, provided energy for further convective development around the system.[1] Tracking in a general northwestward direction, the low gradually developed northward outflow due to a tropical upper tropospheric trough (TUTT) located north of the disturbance.[2] Following further development, the Japan Meteorological Agency declared the system as a tropical depression at 0600 UTC on June 14.[3]

Later on June 14, the JTWC issued a Tropical Cyclone Formation Alert (TCFA) for the depression. Deep convection consolidated around the center of circulation and convective banding features developed along the periphery of the system.[4] Several hours later, the TCFA was canceled as the system rapidly degenerated, with convection mostly dissipating and an exposed low. Outflow significantly deteriorated as the system detached itself from the TUTT.[5] By this time, the JMA had ceased advisories on the depression.[6] Two days later, after tracking across Luzon, the system began to regenerate. Convection redeveloped around the low and outflow was reestablished to the south.[7]

Early on June 17, the JTWC issued a second TCFA as the system continued to organize.

Kaohsiung, Taiwan. Little movement took place for the first few days of the storm's existence as weak steering currents were in place over the South China Sea.[10] Following further development of the depression, the JTWC upgraded it to a tropical storm late on June 17.[11] At 0600 UTC on June 18, the JMA classified the system as a tropical storm and gave it the name Linfa.[12] Limited poleward outflow hindered intensification for the remainder of June 18. By this time, the storm began to increase in forward motion due to a strengthening subtropical ridge located east of Taiwan and a mid-latitude trough to the west.[13]

TRMM
image of Severe Tropical Storm Linfa on June 20

Around 1200 UTC the following day, Linfa further intensified into a severe tropical storm.

Later on June 20, convection near the center of circulation began to decrease–an indication of weakening–and the eye was no longer visible. Upper-level wind shear rapidly increased to 55 km/h (35 mph), preventing re-intensification of the cyclone.[20] Taking a more northward track than anticipated, Linfa began to interact with land and was downgraded to a tropical storm by the JTWC on June 21.[21][22] Around 1230 UTC, the storm made landfall in southern Fujian as a tropical storm with winds of 85 km/h (50 mph 10-minute winds).[23][24] Deep convection rapidly dissipated shortly thereafter due to interaction with land. Several hours later, the JTWC downgraded Linfa to a tropical depression.[25] The following day, the JMA also downgraded Linfa to a tropical depression as the storm moved away from the Chinese coastline.[26] The system later dissipated just offshore; a circulation was no longer evident on satellite imagery.[27]

Preparations and impact

The Colombo Queen run aground by Tropical Storm Linfa

Although Linfa was not forecast to directly impact the Philippines, the outer effects of the storm were anticipated to produce increased rainfall and large swells along western facing coastlines.

Fujian Province. The local governments in the provinces enacted their emergency response plans following this declaration.[31]

Rainfall in the vicinity of the South China Sea between June 18 and June 25, 2009. The greatest amounts of rainfall appear in deep blue.

On June 21, officials in China closed Xiamen port and stated that it would resume operations once the storm passed.[32] Later that day 33,000 vessels sought refuge at port.[33] Following the issuance of a land warning, government offices and schools were closed throughout the island.[34] Officials sent 10 million text messages to residents throughout Fujian Province to warn them about the approaching storm.[35] In Hong Kong, public warning signal number one was raised for nearly 24 hours as Linfa briefly threatened the city on June 20.[36] Officials also evacuated roughly 160,000 people from coastal areas in Fujian.[37] A total of 167 flights to and from Taiwan were canceled or delayed due to the storm.[38]

On June 21, large swells of up to 5.6 m (18 ft) caused a 498-tonne oil tanker, the Colombo Queen, to run aground in southern Taiwan. Rescue crews were unable to reach the ship as it was still in the storm.

Kinmen County, 50 trees were downed, six billboards were destroyed and two homes lost their roofs. By June 22, power companies reported that 2,834 residents had lost power in Wuqiu Township for several hours.[46] Severe damage was reported in the agricultural sector in Taiwan, leaving NT$400 million (US$12.1 million) in losses.[47]

In mainland China, Linfa produced torrential rains, peaking at 488.1 mm (19.22 in) and triggering severe flooding.

¥641 million ($93.8 million).[49]

See also

References

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  2. ^ "Significant Tropical Weather Outlook for the Western and South Pacific Oceans". Joint Typhoon Warning Center. June 13, 2009. Retrieved June 19, 2009.[permanent dead link]
  3. ^ "WWJP25 RJTD 140600". Japan Meteorological Agency. June 14, 2009. Retrieved June 19, 2009.[permanent dead link]
  4. ^ "Tropical Cyclone Formation Alert". Joint Typhoon Warning Center. June 14, 2009. Retrieved June 22, 2009.[permanent dead link]
  5. ^ "Tropical Cyclone Formation Alert (Cancellation)". Joint Typhoon Warning Center. June 14, 2009. Retrieved June 22, 2009.[permanent dead link]
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External links