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Tropical 2025 Tropical Thread

It just came off the coast we will have plenty of runs to sort through over the next 10-12 days

Yeah I do think odds favor OTS but I also remember when Irma was going OTS too

image-36.png

Watch and see the trends around Puerto Rico. If it's going OTS it should be way north of there. Notice how Irma went southwest for awhile

Florence is another one that should have went OTS. Notice how far north it was

Florence_2018_path.png
 
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12Z UK: still has a TS but delayed vs 0Z and not as far N moving WNW at 168:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 114 HOURS
FORECAST POSITION AT T+114 : 20.5N 51.3W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 14.08.2025 120 21.1N 53.2W 1011 29
0000UTC 15.08.2025 132 22.3N 56.9W 1011 27
1200UTC 15.08.2025 144 23.4N 59.6W 1009 30
0000UTC 16.08.2025 156 24.7N 62.1W 1008 34
1200UTC 16.08.2025 168 26.0N 64.3W 1006 42
 
Anyone else surprised that the HNC hasn't painted a lemon on the trough that is now in the eastern GOM?

The high-resolution models do develop a surface LP and move it onshore near SE La. in a couple of days.
 
0Z UKMET for what may be first AEW behind 97L:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 150 HOURS
FORECAST POSITION AT T+150 : 16.0N 49.7W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 17.08.2025 156 17.0N 51.1W 1010 27
0000UTC 18.08.2025 168 18.4N 53.9W 1011 24
 
0Z UKMET for what may be first AEW behind 97L:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 150 HOURS
FORECAST POSITION AT T+150 : 16.0N 49.7W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 17.08.2025 156 17.0N 51.1W 1010 27
0000UTC 18.08.2025 168 18.4N 53.9W 1011 24
Too far north already
 
Southwestern Gulf:
A tropical wave over the northwestern Caribbean Sea is producing
disorganized showers and thunderstorms extending across eastern
Honduras, northeastern Nicaragua and adjacent marine areas. This
system is forecast to move west-northwestward and cross the Yucatan
Peninsula on Wednesday with no significant increase in
organization. Some development of this system is possible after it
emerges across the southwestern Gulf beginning on Thursday while
the system moves to the west-northwest or northwest at 10 to 15 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.
New 🍋
 
The latest Euro Weeklies are showing only 80% of ACE for 9/1-14, a big drop from the progged 400% for 8/18-24 due to Erin to ~1/2 the ACE of its 8/18-24 prog for each of those two weeks (likely MJO related).

But then again, it’s 80% of the very active 2005-24 climo for near peak season. So, even if the 80% were to verify well, that would still mean an active period (even though not to the degree of the Erin week) and would end up way more active than for that period in 2024. Sep 1-14 of 2024 had only ~5-6 ACE, which is a mere <20% of the ~31 ACE avg for Sep 1-14 of 2005-24. Compare that to the EW’s 80% prog, which would be ~25 ACE for Sep 1-14 of 2025 or 4-5 times as high as 2024.
 
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Watch the Bay of Campeche for a possible TC late this week as they often overperform: these percentages look too low

1. Southwestern Gulf:
A tropical wave near the east coast of the Yucatan Peninsula is
producing disorganized showers and thunderstorms this morning. This
disturbance is forecast to move west-northwestward and cross the
Yucatan Peninsula today with no significant increase in
organization. Some development of this system is possible after it
emerges across the southwestern Gulf beginning on Thursday while the
system moves to the west-northwest or northwest at 10 to 15 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.
 
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12Z UK: for several runs has had this after Erin:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 24.3W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 20.08.2025 156 15.9N 24.3W 1010 28
1200UTC 20.08.2025 168 15.7N 28.1W 1009 32
 
12Z UK: for several runs has had this after Erin:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 24.3W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 20.08.2025 156 15.9N 24.3W 1010 28
1200UTC 20.08.2025 168 15.7N 28.1W 1009 32
The EPS has the same potential storm in its forecasts. It had this feature going out to sea as a minimal hurricane later in the forecast period.
 
12Z UK: for several runs has had this after Erin:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 24.3W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 20.08.2025 156 15.9N 24.3W 1010 28
1200UTC 20.08.2025 168 15.7N 28.1W 1009 32
1755109345903.png
 
12Z UK: for several runs has had this after Erin:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 24.3W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
0000UTC 20.08.2025 156 15.9N 24.3W 1010 28
1200UTC 20.08.2025 168 15.7N 28.1W 1009 32

Followup to above:
0Z UKMET has a similarly placed TD following Erin vs the 12Z run:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 28.1W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 20.08.2025 156 15.9N 28.1W 1010 33
0000UTC 21.08.2025 168 15.8N 30.4W 1009 29
 
Followup to above:
0Z UKMET has a similarly placed TD following Erin vs the 12Z run:

NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 156 HOURS
FORECAST POSITION AT T+156 : 15.9N 28.1W

LEAD CENTRAL MAXIMUM WIND
VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS)
-------------- ---- -------- ------------- -------------
1200UTC 20.08.2025 156 15.9N 28.1W 1010 33
0000UTC 21.08.2025 168 15.8N 30.4W 1009 29
Euro and GFS have dropped anything after Erin.
 
Watch the Bay of Campeche for a possible TC late this week as they often overperform: these percentages look too low

1. Southwestern Gulf:
A tropical wave near the east coast of the Yucatan Peninsula is
producing disorganized showers and thunderstorms this morning. This
disturbance is forecast to move west-northwestward and cross the
Yucatan Peninsula today with no significant increase in
organization. Some development of this system is possible after it
emerges across the southwestern Gulf beginning on Thursday while the
system moves to the west-northwest or northwest at 10 to 15 mph.
* Formation chance through 48 hours...low...10 percent.
* Formation chance through 7 days...low...20 percent.

Follow-up: The SW Gulf system, now Invest 98L, is rather convectively active this morning. This area often overperforms and won’t be inland til late tomorrow. It’s currently still only at 20%.
 
Follow-up: The SW Gulf system, now Invest 98L, is rather convectively active this morning. This area often overperforms and won’t be inland til late tomorrow. It’s currently still only at 20%.

More on 98L:

 
MJO climo to keep in mind regarding Invest 98L:

Hurricanes since 1975 in Jul-Sep that hit S or C coast of TX in MJO phase 2:
-Hanna of 2020
-Harvey of 2017
-Claudette of 2003
-Bret of 1999


All S or C coast of TX H landfalls Jul-Sep since 1975 by MJO phase:
-1: Allen 1980
-2: Hanna, Harvey, Claudette, Bret
-3: Beryl 2024, Dolly 2008
-4-8: none

So, of the 7 Hs to landfall on S or C TX Jul-Sep since 1975, 4 (57%) hit during phase 2 and 6 (86%) hit during either phase 2 or 3!
The MJO is in phase 2 today and is progged to likely be in phase 2 tomorrow though phase 3 is a slight possibility. Just some climo for thought.
 
MJO climo to keep in mind regarding Invest 98L:

Hurricanes since 1975 in Jul-Sep that hit S or C coast of TX in MJO phase 2:
-Hanna of 2020
-Harvey of 2017
-Claudette of 2003
-Bret of 1999


All S or C coast of TX H landfalls Jul-Sep since 1975 by MJO phase:
-1: Allen 1980
-2: Hanna, Harvey, Claudette, Bret
-3: Beryl 2024, Dolly 2008
-4-8: none

So, of the 7 Hs to landfall on S or C TX Jul-Sep since 1975, 4 (57%) hit during phase 2 and 6 (86%) hit during either phase 2 or 3!
The MJO is in phase 2 today and is progged to likely be in phase 2 tomorrow though phase 3 is a slight possibility. Just some climo for thought.

It's likely going to run out of time, but if it had another day or so over water, it could have potentially been very problematic.

Still will be a big rainfall event though.
 
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