cieldumort
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Loc: Austin, Tx
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A tropical wave that has rolled off western Africa and is now located several hundred miles southeast of the Cabo Verde Islands in the far eastern Atlantic is being monitored for development.
This disturbance has a setup favorable for long-track and high-ACE. If indeed 98L does develop, it could threaten land closer to the US based on long range modelling. As such, we are now opening up a Lounge.
Long range forecasts for systems this far out in the Atlantic are often deviled by a dearth of data and aren't the most reliable, but we could have a lot of time to watch this one, and should it come close enough, recon would go in.
NHC development odds at the time of this post of 10%/60% at 2D/5D, respectively.
98L became EIGHTEEN on Sep 22 and the title has been updated
Edited by cieldumort (Thu Sep 23 2021 11:22 AM)
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cieldumort
Moderator
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Loc: Austin, Tx
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Based on visible and IR satellite, 98L appears to be organizing at a good clip in the extreme eastern Atlantic.
Given that it is starting out at a lower latitude, it could, as modeling suggests, track farther west than the several wave-to-named-storms that recently came before it.
NHC odds as of the 2PM are 30%/80% and this could be conservative. The next name on the list in the Atlantic basin is Sam.
A rundown of some 12Z Global Runs:
GFS has it as a 965mb Major Hurricane off the coast of NC on Oct 5th
CMC end of run as a 992mb storm while northeast of the Leewards islands tracking WNW or NW on Sep 30
ECMWF end of run has it as a 962mb Major Hurricane north of PR tracking WNW or NW on Sep 30
A potential wrinkle in these (and other) model forecasts is should 98L develop ahead of schedule, it could naturally want to gravitate poleward sooner rather than later, and head north out to sea.
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Mike V
Weather Watcher
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Posts: 31
Loc: Cape Coral, FL
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Now TD18, Forcast to be a major storm in 5 days
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Donna, Betsy, Cleo, George, Floyd, David, ANDREW (Eye wall adventure), Wilma, Katrina, Irma
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Kraig
Weather Hobbyist
Reged: Sun
Posts: 55
Loc: Jupiter, Fl
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There's not much to hold the future Sam back, and I fully expect him to be at least a Cat 4 at some period. Hopefully he is simply a beach issue with large swells along the East Coast.
With the first significant cold front making it to the GOM and Florida area we will soon need to begin to watch that area and the NW Caribbean for short fused storms from stalled frontal boundaries....
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2021 forecast 18-10-5; 18-7-4 as of 9/26
South FL Native: David ('79), Floyd ('87), Andrew ('92), Georges ('98), Irene ('99), Charlie, Frances & Jeanne ('04), Wilma ('05), Matthew ('16), Irma ('17), Dorian ('19) and Isaias (20)
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doug
Weather Analyst
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Posts: 1006
Loc: parrish,fl
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Exactly…this is the time of the season to look for development in the southern and western Gulf
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doug
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cieldumort
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Loc: Austin, Tx
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IsoFlame
Weather Guru
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Posts: 196
Loc: One block off the Atlantic Oce...
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My memory is fading (early onset?), but I can't recall a (potentially) longer-lived Major Atlantic hurricane than Sam., forecast to remain a Major until passing east of Bermuda over the weekend. Sam's Accumulated Cyclone Energy (ACE) is sure to be impressive- I don't know at what point the ACE stops accumulating (extra-tropical?), but the forecast suggest Sam will remain a strong extra-tropical hurricane for several days after the transition:
"Around day 5, global model fields suggest that Sam will be merging with a baroclinic zone and transition into a large and powerful cyclone over the north Atlantic."
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CoCoRaHS Weather Observer (FL-VL-42) & Surf Forecaster: https://www.surf-station.com/north-florida-surf-forecast-3/
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