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Old 09-08-2018, 08:07 AM
 
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8Sept18 8aEDT/AST: Invest 93L became Tropical Depression 8 (TD8) and by 11pEST/AST 7Sept organized enough become Tropical Storm Helene in the far East Atlantic. Estimated winds 45mph(75km/h), moving W 13mph(20km/h), pressure 1001mb.

Lot of dry dusty air right above it though:
Atlantic - Helene forms September 7, 2018-____h12.jpg
(GOESEAST (GOES16) FullDisk GeoColor image)

-Hurricane Watch (possible winds 74+mph within 24-36hours or less) and Tropical Storm Warning (Winds 39+mph) for Cape Verde islands of Santiago, Fogo & Brava. Storm expected to pass near the islands late tonight into Sunday. Rainfall of 3-5inches, isolated 8inches possible, flash flooding possible.

Expected to become a hurricane soon but lot of nearby dry dust filled air may get into slowly that down, and have a couple days to further strengthen before wind shear starts to weaken. Expected to eventually recurve out to sea.

Official updates for Atlantic basin storms comes from the US National Hurricane Center based in Miami, FL. Updates are issued at 5 & 11am/pmEDT/AST (If Watches/Warnings issued then updates are also added at 2 & 8am/pmEDT/AST) here: https://www.nhc.noaa.gov

Cone map (Shows: Current storm wind field at storm center(orange: winds 39mph+, red: 74mph+), Classification (Black/white dots with letters: "D" = Depression, "S" = Tropical Storm, "H" = Cat1 or Cat2 Hurricane, "M" = Major Hurricane (Cat3+)), any coastal tropical Watches/Warnings, and the "cone" is where the center of the storm could be over time (it's NOT the size of the storm), effects of the storm can be felt outside this area:
Atlantic - Helene forms September 7, 2018-h1.jpg


Some Satellite imagery sources:
-Tropical Tidbits: https://www.tropicaltidbits.com/sat/
-GOESeast(GOES16): https://www.star.nesdis.noaa.gov/GOES/index.php
-WeatherNerds: https://www.weathernerds.org/satellite/floaters/

Last edited by Psychoma; 09-08-2018 at 08:33 AM..
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Old 09-08-2018, 10:20 AM
 
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Yep, this *should* be a fish storm. Keeping eyes on TD9.
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Old 09-08-2018, 03:13 PM
 
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8Sept18 5pEST/AST - Estimated winds 60mph(95km/h), moving W 13mph(20km/h), pressure 998mb.

Atlantic - Helene forms September 7, 2018-__h11.jpg
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Old 09-08-2018, 11:39 PM
 
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I don't know how to copy this radar hurricane map our local (Houston) news puts up . . . . So many storms and mention of another in the pacific.

https://www.click2houston.com/hurricane
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Old 09-09-2018, 06:32 AM
 
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I've seen a few people on here before use that map, not sure if just from that specific news site or if a shared platform/same software some stations use here and there across the country. Nice to see them all in one place versus individual cone maps/models.



9Sept18 8aEST/AST - Estimated winds 65mph(100km/h), moving W 14mph(22km/h), pressure 997mb.
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Old 09-09-2018, 03:32 PM
 
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9Sept18 5pEST/AST - Estimated winds 75mph(120km/h), moving W 13mph(20km/h), pressure 992mb. Cat1 Hurricane now but just left the vicinity of the Cape Verde Islands so all Watches/Warnings have been discontinued. Expected to continue strengthening but eventually weakening as turns out to sea. After Florence we'll keep watching just to make sure.

Atlantic - Helene forms September 7, 2018-_fish1.jpg
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Old 09-09-2018, 08:48 PM
 
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9Sept18 11pEST/AST - Estimated winds 85mph(140km/h), moving WNW 13mph(20km/h), pressure 984mb.
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Old 09-10-2018, 07:22 PM
 
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10Sept18 5pEST/AST - Estimated winds 105mph(165km/h), moving WNW 14mph(22km/h), pressure 974mb. Has a few more days to strengthen before conditions become unfavorable. Still expected to turn out to sea.


Atlantic - Helene forms September 7, 2018-sssssss.jpg
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Old 09-13-2018, 09:11 PM
 
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13Sept18 11pEST/AST - Estimated winds 65mph(100km/h), moving N 21mph(33km/h), pressure 992mb. Tropical Storm now. About 885miles(1,425km) SW of Lajes Air Base on Azores Islands. Will pass near or over the islands late Saturday or Sunday.

Tropical Storm Watch for the Azores Islands (Tropical Storm winds (39+mph) possible within 48hours or less). Tropical Storm force winds extend up to 140miles(220km) from storm center.

Rainfall of 2-4in, isolated 8in across W Azores, flash flood risk.

After Azores, looks like Helene is off to visit Northern Europe:
Atlantic - Helene forms September 7, 2018-winds.jpg

Atlantic - Helene forms September 7, 2018-htrj.jpg

Probability map for % chance of Tropical Storm force winds 39mph or higher:
Atlantic - Helene forms September 7, 2018-tsposs.jpg

Probability map for % chance of Tropical Storm force winds 58mph or higher:
Atlantic - Helene forms September 7, 2018-tsposs2.jpg
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Old 09-21-2018, 06:42 PM
 
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On 16Sept18 NHC issued their last advisory on Helene at 11amEDT/AST as the storm became a strong post-tropical system. It later was named storm 'Ali' affecting portions of Northern Europe. An archive of previous NHC advisories and graphics can be found here: https://www.nhc.noaa.gov/archive/2018/HELENE.shtml?
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