Forecasters reported that Tropical Storm Sean, which had transitioned into a depression on Saturday evening, became a post-tropical remnant on Sunday night.
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On Sunday night, the National Hurricane Center reported that Sean had moved northwestward into an increasingly dry environment and begun weakening further; they expected its destruction by Monday night or Tuesday evening.
The Hurricane Center estimated that this post-tropical cyclone had maximum sustained winds of 30 miles per hour; disturbances with sustained winds exceeding 39 m.p.h are given official names.
Storm was approximately 905 miles east of Northern Leeward Islands and moving west-northwest at 12 m.p.h.
There is still over one month remaining of Atlantic hurricane season.
The Atlantic hurricane season officially kicked off June 1 and runs through November 30.
At its late May prediction meeting, National Oceanic and Atmospheric Administration officials predicted there would be 12 to 17 named storms this season – which they considered “near-normal”; on Aug 10, NOAA officials revised this estimate upward to 14-21 storms; Sean is the 18th named storm of Atlantic hurricane season and Hurricane Center officials noted an unnamed January storm would have qualified as qualifying for recognition bringing this total up to 19.
Last year there were 14 named storms after two intense Atlantic hurricane seasons during which forecasters ran out of names and needed backup lists (a record 30 storms formed in 2020).
This year has seen the debut of an El Nino pattern, which first arrived in June. This intermittent climate phenomenon can have wide-reaching impacts on global weather systems; typically reducing Atlantic hurricane activity.
El Nino increases wind shear in the Atlantic by creating instability that increases wind speeds and directions from land or ocean surfaces into the atmosphere. Hurricanes require calm conditions for formation; increased wind shear makes this less likely. (El Nino has the opposite effect in the Pacific by decreasing it.)
At the same time, this year’s elevated sea surface temperatures pose multiple threats, including potentially amplifying storms.
Climate scientists agree on one point: hurricanes are becoming more powerful as a result of global warming, even though overall there may not be more named storms overall, as major hurricanes become increasingly likely.
Climate change is having an effect on how much rain storms produce. A warming world means air can hold more moisture, meaning named storms such as Hurricane Harvey can generate even more precipitation – in Texas alone some areas saw over 40 inches fall within 48 hours.
Researchers have also discovered that storms have become slower over the decades, remaining over areas for an extended period.
Storms that slow over water absorb more moisture; when they slow over land, more rain falls as one location; for instance, Hurricane Dorian was observed to bring 22.84 inches of precipitation in Hope Town during its journey across northwestern Bahamas in 2019.
Other potential consequences of climate change may include increased storm surge, rapid intensification and an expanded tropical systems’ reach.
Rebecca Carballo, Johnny Diaz, Jesus Jimenez and Christopher Mele contributed reporting.
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