User:Olo72/sandbox
| Subtropical cyclone (SSHWS/NWS) | |
 The storm near peak intensity on May 7 | |
| Formed | May 4, 2018 |
|---|---|
| Dissipated | May 10, 2018 |
| (Remnant low after May 9) | |
| Highest winds | 1-minute sustained: 50 mph (85 km/h) |
| Lowest pressure | 992 mbar (hPa); 29.29 inHg |
| Fatalities | None |
| Damage | None |
| Areas affected | Alejandro Selkirk Island, Southern Chile |
| Part of the 2017–18 South Pacific cyclone season (unofficially) | |
Subtropical Cyclone Lexi, unofficially named by researchers,[1] was a highly unusual subtropical cyclone that formed in May 2018, west of the Chilean coastline. After the 2017–18 South Pacific cyclone season had officially ended, the system was identified outside of the basin's official boundaries in early May, near Alejandro Selkirk Island. Because Lexi developed outside of the official areas of responsibility of the warning agencies in the South Pacific, the storm was not officially included as part of the 2017–18 South Pacific cyclone season.
Meteorological history[edit]
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
Extratropical cyclone, remnant low, tropical disturbance, or monsoon depressionThe cyclone formed from a cut-off low that developed a low with convection on the surface, at the same time that the maximum winds in height diminished, and so therefore, the vertical wind shear decreased. This allowed the convection to develop almost symmetrically around the center of the low, giving rise to subtropical low characteristics, without associated fronts.[2][3]
This system formed in water temperatures between 18 to 20 °C (64 to 68 °F), which is usually not supportive of sufficient thunderstorm activity.[3]
After that time, the storm was identified by researchers and unofficially named Lexi.
Notes[edit]
See also[edit]
- Subtropical Cyclone Katie
- South Atlantic tropical cyclone
- Mediterranean tropical-like cyclone
- 2006 Central Pacific cyclone
- 1996 Lake Huron cyclone
- Tropical cyclone basins
- Tropical cyclogenesis
References[edit]
- ^ Steve Young (5 July 2018). "Monthly Global Tropical Cyclone Tracks - May 2018". Australia Severe Weather. Retrieved 3 September 2018.
- ^ "Baja subtropical frente a las costas de Chile - Revista del Aficionado a la Meteorología". Revista del Aficionado a la Meteorología (in European Spanish). 2018-05-08. Retrieved 2018-05-10.
- ^ a b "Extremely Rare Southeast Pacific Subtropical Cyclone Forms Off the Chilean Coast". The Weather Channel. Retrieved 2018-05-10.
External links[edit]
Tropical cyclones of the 2017–18 South Pacific cyclone season | ||
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Category:Subtropical cyclones
Category:Subtropical storms
Category:Cyclones in South America