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Invest 96L — 60%/60%

tiger_deF

By tiger_deF,
in Tropical Headquarters

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tiger_deF

tiger_deF

Posted
Posted

After a parade of struggling invests which have failed to materialize, it looks like the Atlantic, in this anemic season, may actually be capable of producing a potentially long-tracking hurricane!
96L is not currently a threat to land, and the vast majority of models show this system recurving out to well east of the CONUS

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GaWx

GaWx

Posted
Posted

0Z UKMET: doesn’t quite get it to Dolly strength but still has it as a TD although this run then weakens it while moving rapidly WNW in the MDR followed by a reformation 2 days later moving W much more slowly toward the SE Bahamas:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 48 HOURS
FORECAST POSITION AT T+ 48 : 12.4N 33.9W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 27.08.2026 48 12.4N 33.9W 1010 28
1200UTC 27.08.2026 60 13.0N 37.8W 1009 30
0000UTC 28.08.2026 72 13.2N 42.0W 1009 31
1200UTC 28.08.2026 84 14.1N 46.7W 1010 32
0000UTC 29.08.2026 96 CEASED TRACKING


NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 150 HOURS
FORECAST POSITION AT T+150 : 20.3N 67.0W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 31.08.2026 156 21.0N 68.4W 1010 34
0000UTC 01.09.2026 168 20.9N 70.6W 1009 32

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  • tiger_deF changed the title to Invest 96L — 70%/70%
NorthHillsWx

NorthHillsWx

Posted
Posted

*Almost* unanimous model support for *some* development but it is apparent this system has serious hurdles ahead of it. There is likely a window for development/strengthening over next few days, but then it hits a wall of shear, so options at that time are dissipation or weakening. Beyond that, location will be everything. If the system survives into the SW basin, there could possibly be an area of lower shear allowing for development as it likely recurves. If the system goes into Caribbean, it will be heading towards its grave. You're starting to see even the GFS back off on its latest run to a more realistic scenario given the harsh conditions ahead of the system. I am fairly confident this becomes a named storm but I do not think it has much of chance to be a long-tracked hurricane, and it likely won't have much window to intensify at all unless it makes it through the TUTT intact. Probably looking a weak, sheared TS for awhile 

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GaWx

GaWx

Posted
Posted

12Z UKMET: similar to 0Z run with TCG by tomorrow along with rapid WNW movement in MDR along with it barely reaching TS status before weakening back to a TD though this time it remains a TC and strengthens back to a TS late moving much more slowly WNW near SE Bahamas:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 30 HOURS
FORECAST POSITION AT T+ 30 : 13.0N 32.0W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 27.08.2026 36 13.0N 34.0W 1008 29
1200UTC 27.08.2026 48 13.2N 38.0W 1007 33
0000UTC 28.08.2026 60 13.8N 41.9W 1008 33
1200UTC 28.08.2026 72 14.6N 46.5W 1009 36
0000UTC 29.08.2026 84 15.6N 50.9W 1009 33
1200UTC 29.08.2026 96 16.9N 55.1W 1010 35
0000UTC 30.08.2026 108 17.8N 58.9W 1010 33
1200UTC 30.08.2026 120 19.0N 62.6W 1009 35
0000UTC 31.08.2026 132 19.6N 65.4W 1008 30
1200UTC 31.08.2026 144 20.5N 68.0W 1008 31
0000UTC 01.09.2026 156 21.3N 69.7W 1007 35
1200UTC 01.09.2026 168 22.2N 71.7W 1006 38

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Boston Bulldog

Boston Bulldog

Posted
Posted

Yeah the GFS short to medium term backoff was expected, though the later window for recovery and potential intensification north of the islands is real. Future Dolly has the cards stacked against it in terms of making it to that pocket however. The shear is very real, as well as decreasing RH. Basin tenor has been very hostile this year, it just seems so much more likely that this fragile system will dissipate with a whimper. 

Some classic survivor bias within ensemble intensity forecasts down the line, and even that has been reduced as we've seen downtrending across the board today. Most AI ensemble members don't even show a TC anymore!

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GaWx

GaWx

Posted
Posted

0Z UKMET delays transition to a TD for 4 days vs the 12Z run but still has it taking a similar path and gets to a TS quickly as it moves WNW a little NE of the Bahamas:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 126 HOURS
FORECAST POSITION AT T+126 : 20.3N 67.4W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 31.08.2026 132 21.0N 68.5W 1011 32
0000UTC 01.09.2026 144 22.4N 70.3W 1009 38
1200UTC 01.09.2026 156 23.0N 71.7W 1006 43
0000UTC 02.09.2026 168 24.1N 73.4W 1002 39

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WxWatcher007

WxWatcher007

Posted
Posted
4 hours ago, Boston Bulldog said:

Yeah the GFS short to medium term backoff was expected, though the later window for recovery and potential intensification north of the islands is real. Future Dolly has the cards stacked against it in terms of making it to that pocket however. The shear is very real, as well as decreasing RH. Basin tenor has been very hostile this year, it just seems so much more likely that this fragile system will dissipate with a whimper. 

Some classic survivor bias within ensemble intensity forecasts down the line, and even that has been reduced as we've seen downtrending across the board today. Most AI ensemble members don't even show a TC anymore!

Extraordinarily tough sledding across the basin this season. I kind of feel like this one is important to my peak season forecast.

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NorthHillsWx

NorthHillsWx

Posted
Posted

Morning visible reveals some decent low level spin, showing this has developed a surface low. However, convection has waned this morning and remains extremely disorganized. NHC has dropped odds to 60% of developing and it seems it has about a 36 hour window and conditions are marginal even during this time. 3 straight cherries failing to develop might be a first that I can recall, if 96L truly doesn't get classified as at least a TD. I do not believe in the "survivor" scenarios some ensembles show in the SW Atlantic. The TUTT this thing is going to run into is going to annihilate an open wave (30-40 kts shear) I would be shocked if anything gets through to develop. Just shocking how hostile the basin is from a shear perspective. We knew ENSO was going to be against development most of the season but seeing these extremely strong waves and a very active wave train with more limited SAL than recent seasons and not having a single one find a gap is wild. For perspective, if you took the background state of the Atlantic in any of the past few seasons and had the same SAL conditions and wave activity we are seeing with this year, I think the MDR would be setting records. 

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  • tiger_deF changed the title to Invest 96L — 60%/60%
GaWx

GaWx

Posted
Posted
35 minutes ago, jconsor said:

If it walks like a duck and quacks like a duck, it's probably a duck...

https://x.com/yconsor/status/2092623985091494311

 The 12Z UKMET, unlike the 0Z, says it is, indeed, a duck as it does develop it and fast! It moved TCG back up 4.5 days back to about when yesterday’s 12Z run had TCG, this evening! Like many runs before the 0Z, it has rapid WNW movement in the MDR while keeping it (mainly) a TD and then strengthens it to TS Dolly about when it leaves the MDR and slows down and later passes just NE of the Bahamas:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 12 HOURS
FORECAST POSITION AT T+ 12 : 13.8N 33.6W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 27.08.2026 12 13.8N 33.6W 1010 27
1200UTC 27.08.2026 24 13.6N 37.9W 1008 31
0000UTC 28.08.2026 36 13.8N 41.6W 1010 30
1200UTC 28.08.2026 48 14.4N 46.3W 1010 32
0000UTC 29.08.2026 60 15.0N 50.5W 1011 29
1200UTC 29.08.2026 72 16.4N 54.4W 1011 33
0000UTC 30.08.2026 84 17.5N 58.3W 1011 32
1200UTC 30.08.2026 96 18.6N 61.7W 1011 33
0000UTC 31.08.2026 108 19.5N 63.9W 1010 32
1200UTC 31.08.2026 120 20.5N 66.3W 1009 40
0000UTC 01.09.2026 132 21.6N 67.9W 1008 43
1200UTC 01.09.2026 144 22.3N 69.7W 1007 42
0000UTC 02.09.2026 156 23.2N 71.1W 1002 43
1200UTC 02.09.2026 168 24.5N 73.3W 999 42

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GaWx

GaWx

Posted
Posted
1 hour ago, jconsor said:

If it walks like a duck and quacks like a duck, it's probably a duck...

https://x.com/yconsor/status/2092623985091494311

Here’s the last map of the 12Z UKMET showing the strengthening 96L moving WNW.
 

Aside: I also see a very weak sfc low on those late maps moving W toward NE FL. It’s doing so due to W steering from an H5 594 dm high centered over the well inland SE. I wonder if that weak low is real:

IMG_1994.jpeg.050159d553682cbe477d9bab3bf35d52.jpeg

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