1. Meteorological history

2. Preparations and impact
    Hong Kong  Mainland China 

3. See also

4. References

5. External links

Tropical Storm Ewiniar was a weak tropical cyclone that affected South China in early June 2018. The storm brought torrential rainfall and landslides over in the southern provinces. Ewiniar, as the fourth named storm of the 2018 Pacific typhoon season, firstly developed as a tropical depression just to the west of the Philippines on June 2. Maintaining its intensity for a few days in the South China Sea, the system moved north just near Hainan island where it intensified into a tropical storm on June 6. The storm made landfall shortly thereafter and rapidly weakened into a remnant low on June 9, before dissipating four days later.

The name was submitted by the Federated States of Micronesia and is the name of a Chuukese storm God.

Meteorological history

The Joint Typhoon Warning Center (JTWC) began to track a tropical disturbance that had develop about 139 mi (86 km) southeast of Puerto Princesa, Palawan.^[1] At this point the system was located in a very favorable environment with relatively low wind shear between 5–10 knots and sea surface temperatures (SSTs) of over {{convert|31|C|abbr=on}}.^[1] The JTWC then issued a Tropical Cyclone Formation Alert (TCFA) for the system the next day.^[2] By 00:00 UTC on June 2, the Japan Meteorological Agency (JMA) classified the system as a tropical depression and began issuing advisories, estimating 10-minute sustained winds at about 55 km/h (35 mph).^[3] Nine hours later, the JTWC followed suit and gave the identifier 05W.^[4] Convection was only limited as it was wrapping into the system's low-level circulation center (LLCC).^[5] By June 3, 05W entered an unfavorable environment with moderate to high wind shear, despite warm SSTs.^[6] Due to this, deep convection was sheared away from the center which contributed to exposing and elongating the LLCC.^[6]

05W remained as a weak tropical depression due to continuous high shear until on June 5, when the system started to re-organize with an improved and deepening convection while located in an area where shear had been reduced.^[7] Continuous flaring convection along with weaker shear prompted the JTWC to upgrade 05W to a tropical storm by 21:00 UTC of the same day.^[8] On 00:00 UTC of June 6, the JMA upgraded the system to a tropical storm too, receiving the name Ewiniar, the fourth named storm of the season.^[9] Around that time, satellite imagery had depicted a growing central dense overcast where it was obscuring its LLCC.^[10] According to the JTWC, however, by 09:00 UTC of that day, deep convection had diminished slightly which caused the storm to weaken back to a tropical depression.^[11] By 06:00 UTC of June 7, the JMA had declared that Ewiniar had reached its peak intensity with 10-minute sustained winds of 75 km/h (45 mph) along with a minimum barometric pressure of 998 hPa (29.47 inHg).^[12] In that same time, the JTWC re-upgraded Ewiniar back to a tropical storm as convection had deepened again, with a recognized 1-minute peak of only 65 km/h (40 mph).^[13] Although six hours later, satellite imagery depicted that convective banding started to decay as Ewiniar neared the coast of southern China,^[14] and this prompted the JTWC to issue their final advisory on Ewiniar on 21:00 UTC of the same day.^[15] The JMA, though, tracked the system until 00:00 UTC on June 9, when the system rapidly degenerated into a remnant low over land.^[16] The storm's remnant continued to persist, however, moving out to sea and crossing over Taiwan, before dissipating on June 13.

Preparations and impact

Hong Kong

On 12:40 p.m. local time (04:00 UTC) of June 7, the Hong Kong Observatory (HKO) issued "Typhoon Signal No.3", with winds warned and expected between 41–62 km/h (25–39 mph).^[17] The Education Bureau had declared kindergarten and special-needs schools classes will be closed for the day due to the storm while some beaches were closed due to rough waves. Moreover, the HKO had recorded a total 1-hour rainfall of 70 mm (0.4 inches) in the Sha Tin District.^[17]

Mainland China

On June 6, rainfall amounts recorded in the island of Hainan were averaged about 100–200 mm (4–8 inches) with some reported of up to 300 mm (12 inches) in some areas.^[18] A total of 13 people were killed, while total damages in Mainland China were counted to be ¥5.19 billion (US$812 million).^[19]

See also

• Other cyclones named Ewiniar
• Tropical Storm Russ (1994)
• Tropical Storm Hagibis (2014)

References

External links

• JMA General Information on Tropical Storm Ewiniar (1804) from Digital Typhoon

• JMA Best Track Data (Text)

• 05W.EWINIAR from the U.S. Naval Research Laboratory

• Neal Tivis
• Neal Travis
• Neal T. Stephenson
• Nealveer Chatha
• Neal, William
• Nealyda accincta
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