Typhoon Shanshan (2018)

This article is about the 2018 typhoon. For other storms of the same name, see Typhoon Shanshan (disambiguation).

Typhoon Shanshan

Typhoon Shanshan approaching Japan at peak intensity on August 7, 2018.
Meteorological history
Formed	August 2, 2018
Extratropical	August 10, 2018
Dissipated	August 10, 2018
Typhoon
10-minute sustained (JMA)
Highest winds	150 km/h (90 mph)
Lowest pressure	970 hPa (mbar); 28.64 inHg
Category 2-equivalent typhoon
1-minute sustained (SSHWS/JTWC)
Highest winds	155 km/h (100 mph)
Lowest pressure	953 hPa (mbar); 28.14 inHg
Overall effects
Fatalities	none
Damage	$866,000
Areas affected	Mariana Islands, Japan
IBTrACS
Part of the 2018 Pacific typhoon season

Typhoon Shanshan was a strong and slow-moving typhoon that passed close to Japan before moving out to the sea. Shanshan was the fourteenth named storm and fifth typhoon of the 2018 Pacific typhoon season.

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

Shanshan began as a depression east-northeast of Guam on August 2. At 21:00 UTC (GMT+10) on the same day, the Joint Typhoon Warning Center (JTWC) began tracking the system, giving it the identifier 17W.^[1] 17W intensified into a tropical storm on August 3, with the Japan Meteorological Agency assigning it the name Shanshan.^[2] The storm was located over a favorable environment as the system was gradually consolidating,^[3] and it intensified into a severe tropical storm on August 3. The following day, both the JMA and JTWC upgraded Shanshan to a typhoon after deep convection was seen wrapping into its developing center. The JMA later determined that the storm had peaked in intensity with 10-minute winds of 130  km/h (80  mph) and a minimum pressure of 970 hPa, and expected the storm to maintain that intensity for several days. The JTWC stated that Shanshan had slightly weakened after a strengthening trend by August 6 after its eye became ragged and slightly displaced. On August 7, Shanshan began to re-intensify and reached its peak strength as a Category 2 typhoon with 1-minute winds of 165  km/h (105  mph) while nearing southeastern Japan. Thereafter, Shanshan began to change course towards the east as it rapidly weakened. The JTWC issued their final advisory on August 9, although the JMA tracked the system until it became extratropical at 06:00 UTC on August 10.

Preparations and impact

Typhoon Shanshan off the coast of Japan

In Okinawa, about 600 people were evacuated from their homes to shelters. About 386 flights to western Japan were canceled due to the storm.^[4] There was no major damage, but four people were injured by the storm. More than 2,000 people evacuated from their homes early on the morning hours of Thursday.^[5] Overall losses in Miyagi Prefecture were counted at ¥96.2 million (US$866,000).^[6]

See also

• Weather of 2018
• Tropical cyclones in 2018

References

1. "Tropical Depression 17W (Seventeen) Warning Nr 001". Joint Typhoon Warning Center. August 2, 2018. Archived from the original on May 23, 2024.
2. "Tropical Storm 17W (Shanshan) Warning Nr 003". Joint Typhoon Warning Center. August 3, 2018. Archived from the original on May 23, 2024.
3. "Prognostic Reasoning for Tropical Storm 17W (Shanshan) Warning Nr 04". Joint Typhoon Warning Center. August 3, 2018. Archived from the original on May 23, 2024.
4. "Powerful typhoon batters Okinawa, churns to Japan mainland".
5. "Typhoon Shanshan clips Japan coast, sparing Tokyo".
6. 平成３０年の災害等の発生状況 (PDF) (Report) (in Japanese). Miyagi Prefectural Government. 2018. Archived (PDF) from the original on July 27, 2019. Retrieved November 11, 2018.