GaWx

Indeed, the weighted avg of your graph, which looks like it is only ~+1.25 to 1.5, doesn’t at all jibe with the image below, which shows it ~+3.3:

12Z UKMET: again says no Gulf TC

It still does have a system / vorticity breaking off of the CAG 130'ish hours into the 6Z run, it just fails to develop a fully fledged TC and bring that into the GOM. That could just as easily come back on the 12z today. Again, chaotic. Though, yes, it also breaks off vorticity and develops a hurricane late in the run. Meh, these simulations will remain complete choas until something actually resolves. If anything can be taken from these runs at this point, it's to say we should have a warbling surface trough gyre establish itself by this weekend over central America and we just need to watch for any pieces of energy and vorticity that may break off on either side of the landmass (EPAC or WCARIB) for potential development over the next few weeks. The MJO is heading toward favorable phases for TCG at this time of year, which Joe Bastardi has been appropriately emphasizing in his call for activity:

Despite the Euro having something in the Gulf late, ironically the crazy GFS has no Gulf TC on its 6Z for the 1st run since way back at 18Z of 9/14! It just has one moving just N of Cuba (not in Gulf) at 384.

The off again, on again UKMET is now off again with a Gulf TC fwiw.

5th CFSv2 AAM run in a row with an extreme/historic level of 4+ being progged starting Sep 19th! It looks like it’s going to actually happen, folks! My inner weenie is genuinely excited:

Per Eric Webb’s table, 1925-6 trimonthlies peaked at +1.3.

The E US heat of Sept 2026 is somewhat similar to the intense E US heat of another El Niño Sept, that of record breaking 1925.

This chart agrees with your data that the minimum has passed due to increases during the last week: 2026 is now back to ~175K sq km above the 2013-24 avg for Sept 15th, which is the best in relation to that avg in about a month. It’s now per this chart >800K higher than it was on 9/15/2020! 2020 didn’t reach yesterday’s level til ~Oct 5th! The cold Arctic N of 80N during summer very likely helped:

Thanks. I agree 100% with the above analysis as of Sept 13th MTD suggesting Sept of 2026 at GSO would (assuming the model projection is in the ballpark of reality of course) obliterate 2019’s 76.4F! Update: Sept 1-15 is at 80.0, which is consistent with the graph. But FYI regarding GSO’s warmest Septembers on record: 1921 at 78.2 and 1925 at 77.9 were warmer than 3rd place’s 2019 at 76.4. Even so: if I look at projections for these projections for the 2nd half of September and assuming they’re in the ballpark of reality, GSO would even be flirting with 1921’s 78.2! The projection I ran was 78.1, which would obliterate 2019’s 76.4. https://www.weather.gov/wrh/Climate?wfo=rah

After having a central Gulf TD late on yesterday’s 12Z per the quoted post and then not on the 0Z, today’s 12Z UKMET at the identical time (18Z on 9/21) has a TD form albeit in the E Gulf rather than C Gulf and with it moving very slowly WNW just like yesterday’s run had: NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 126 HOURS FORECAST POSITION AT T+126 : 26.8N 84.1W LEAD CENTRAL MAXIMUM WIND VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS) -------------- ---- -------- ------------- ------------- 0000UTC 22.09.2026 132 26.6N 84.0W 1008 21 1200UTC 22.09.2026 144 27.0N 84.7W 1008 20 0000UTC 23.09.2026 156 27.1N 84.7W 1008 25 1200UTC 23.09.2026 168 27.2N 85.4W 1006 31

9/15 12Z CFSv2 consistent with 0Z run having AAM on Sep 19th go to a historical extreme level (+4+):

Chuck, I’m thinking that the reason the 2m anomalies aren’t as impressive as the H5 anomalies is probably that there’s a lot of Atlantic origin moist and cooler air in the 2m mix as opposed to drier and hotter land based air. Opinions?

What’s this on the 12Z UKMET? For the first time, it has a TC (TD) in the C Gulf late in the run with it moving slowly WNW and strengthening: NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 150 HOURS FORECAST POSITION AT T+150 : 25.0N 90.7W LEAD CENTRAL MAXIMUM WIND VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS) -------------- ---- -------- ------------- ------------- 0000UTC 22.09.2026 156 25.0N 90.4W 1008 23 1200UTC 22.09.2026 168 25.5N 91.7W 1005 31

Check out this insanity: the latest 3 day mean CFSv2 has not just the most negative H5 anomalies of DJFM in March but even the absolutes are the most negative! And it’s been that way on a good # of 3 day means! Dec: highest H5 absolutes and anomalies of DJFM: March: lowest H5 absolutes and anomalies of DJFM as they steadily cool from Dec to March! The absolutes for March are 5-15 dm lower than that for Dec over most of the E US! Does this look reasonable? The 2m absolutes aren’t the coldest though although they’re not far off in some portions. I couldn’t find a Nino with the coldest absolutes of the winter in March though I found many with a solidly cold March. The only winters on record with the coldest absolutes of NDJFM being March in the E US overall are 1890, 1932, and 1960 (all non-Nino). I guess we’re due fwiw.