Tropical Storm Yagi (2018)

Tropical storm Yagi

Tropical storm (JMA scale)
Tropical storm (SSHWS)
Formed	August 6, 2018 (2018-08-06)
Dissipated	August 16, 2018 (2018-08-16)
(Remnant low after August 15, 2018 (2018-08-15))
Highest winds	10-minute sustained: 75 km/h (45 mph) 1-minute sustained: 100 km/h (65 mph)
Lowest pressure	990 hPa (mbar); 29.23 inHg
Fatalities	7
Damage	$365 million (USD)
Areas affected	China, Taiwan, Philippines, and Korea
Part of the 2018 Pacific typhoon season

Tropical storm Yagi also known as tropical storm Karding to the Philippines was the eighteenth system and fourteenth named storm to form in the annual 2018 Pacific typhoon season that was known to affect the Philippines by enhancing the monsoonal rainfall. The storm first started out as a tropical depression forming off of the west Pacific ocean on August 6th. As it progresses westward, it reached tropical storm strength on August 8th and then preceded to move northwestward from then on.

Meteorological history

Map plotting the storm's track and intensity, according to the Saffir–Simpson scale

Map key

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

Tropical cyclone

Subtropical cyclone

Extratropical cyclone, remnant low, tropical disturbance, or monsoon depression

On August 6, 21:00 UTC, a tropical depression had formed off from an area of convection southwest from Iwo To and was designated 18W by the Joint Typhoon Warning Center (JTWC). Due to the southwest monsoon flow, the system was poorly organized at first, remaining in an almost stationary motion or just stalling, with some of its convection shearing westward. On August 7, the system was still stalling on the Philippine Sea, with multispectral satellite imagery depicting that the storm had an exposed low-level circulation center (LLCC) with deep convection shearing due to the moderate to strong easterly vertical wind shear (VWS). On August 8, as the easterly VWS became more slightly offset and was refueling the deep convection, the system organized enough into a tropical storm at 09:00 UTC. It was then it changed its direction towards northwestward. Later on August 9, the flaring convection was starting to cover the exposed LLCC, with the center of the storm already concealed by it. Deep convection began to move into the western semicircle due to the moderate easterly VWS, though radar imagery suggested that shallow bandings were wrapping into the LLCC on August 11. It was also then the system reached its peak intensity. On August 12, under the influence of the subtropical ridge the storm steered northwestward towards China and made landfall at mainland China in the Shandong province. The structure of the storm continued to decay and transitioned into a remnant low on August 15, later dissipating the day after.