GaWx

0Z UKMET has Edouard’s little sis like the 12Z run sort of had with its 1010 non-TC low, but is notably stronger with it as it has it as a TD: NEW TROPICAL CYCLONE FORECAST TO DEVELOP AFTER 150 HOURS FORECAST POSITION AT T+150 : 28.8N 95.9W LEAD CENTRAL MAXIMUM WIND VERIFYING TIME TIME POSITION PRESSURE (MB) SPEED (KNOTS) -------------- ---- -------- ------------- ------------- 1200UTC 08.09.2026 156 29.5N 96.9W 1003 29 0000UTC 09.09.2026 168 31.1N 99.1W 1007 21

Even when it is using the cooler 1981-2010 instead of the warmer 1991-2020 for climo?

Thanks, Don. Wow, this isn’t even close to the cold JB showed though it was unlabeled. Is he by chance using normals from the Eocene epoch?

Fortunately, I stuck to relatively safe lower elevations near the lake.

I ended up with an impressive ~8.85” of rain in August.

That was very early for me lol. I woke up pretty early as I knew it would take nearly 3 hrs to get there. I thought I was doing well based on the models showing hardly anything before 3PM. Regardless, it was still a stunning experience! It was nice (PC) for over an hour at the start and when it rained it was light with no lightning thank goodness. I also should mention that I had no intention to hike up those mountains. I hiked on ground that didn’t rise more than 150 feet or so up to only ~11,700 feet max not far from the beautiful Maroon Lake.

I think that being open-minded about this is the best approach at this time. I initially assumed that CC was the main cause of this. Now, after reading about the bedrock collapse theory put out by a reputable publication (per my checking into it this morning), that’s giving me some doubt about my first thoughts. I just posted this elsewhere: “I’ve also been reading about the theory about the main cause of this being bedrock failure with the glacier collapsing mainly because of that. Whereas CC could easily still have played some role, there are currently more doubts in my mind than earlier as regards whether it played a large role based on what I’ve been reading today. In summary, much more time is likely needed to attempt to figure out the actually cause(s) of this complex disaster. That’s the safest approach to take now. Even if CC didn’t play much of a role in this, that in itself doesn’t minimize the effect of it on melting ice in general due to GW.”

Here’s Martz’s follow-up 5 minute video, which incorporates the “massive bedrock collapse” beneath the glacier as opposed to glacier collapsing, itself, theory that he quoted in his prior post, which I just posted two posts above this: @donsutherland1@chubbs

Any comments on this @donsutherland1@chubbsor others?

From pro met. “USTropics”, here’s a very detailed post that I won’t pretend to understand fully. Any opinions? “There are a few things making the satellite presentation appear that Edouard is weakening, but don’t let these processes fool you. This is not land proximity or dry air entrainment (WV would show this). The full process we are witnessing; During the initial ‘ramp up,’ deep convection is typically asymmetric. This creates intense, localized potential vorticity (PV) anomalies. The ‘ramp down’ (where cloud tops warm and deep convection appears to collapse) is the system digesting these anomalies. The asymmetric PV is sheared out by the developing cyclonic flow and mixed into the symmetric mean vortex. Edouard is simply spending its energy aligning its low-level and mid-level circulation centers rather than fueling vertical updrafts. Central pressure is a response to the integrated column warming (hydrostatic balance) and the broadening of the wind field (gradient wind). When the initial convective bursts collapse like it did earlier, they leave behind a thick mid-to-upper level stratiform deck and a broad area of latent heat release. This residual warm core forces the mass field to continue adjusting. The central pressure drops as the wind field expands, even though the intense, localized vertical velocities (and thus cold cloud tops) have temporarily vanished. This Is why recon is still finding pressure drops. This lull is actually highly productive for the storm. As the PV concentrates in the center and the pressure drops, the inertial stability of the inner core increases dramatically. High inertial stability resists radial outflow, meaning that any subsequent latent heat release will be trapped locally near the center. In addition, we have to account for diurnal convective pulsing. Deep convection typically peaks in the early morning hours (the ‘ramp up’) and naturally wanes by mid-to-late afternoon (the ‘ramp down’). If a system is undergoing vortex alignment during the daytime/evening, the lack of convection looks like a structural failure on infrared satellite, even while reconnaissance aircraft find a falling pressure. Once the center is vertically stacked and the inner core has achieved high inertial stability, the next convective burst hits a dynamical tipping point. Because the heating is now occurring in a highly symmetric, stable environment, the energy efficiently projects onto the symmetric vortex. This triggers a much more sustainable and deep period of intensification.”

I somehow missed posting about Sunday’s rainfall rough estimate at my home. I was alerted to it by Cocorahs and local TV wx. I very roughly estimate my home got 1”. That gets my total MTD through yesterday of a solidly wetter than normal ~8.85” to help the drought.

Thank you! Have you had a chance to compare these to the prior forecast’s maps? My first impression is that Dec is a good bit cooler than I expected as per analogs. Edit: @snowman19must be flipping out seeing how cool Dec is!!

Do you have the 2m maps?

Thanks, Don. I can tell that Chris Martz has been affecting JB recently. Until recently, I recall JB (like many other mets) used to mention “heat dome” regularly without a sarcastic tone. But this summer whenever he mentions it, he often does so with a sarcastic tone. He doesn’t go out of his way to say it isn’t appropriate. But he clearly sounds like he’s making fun of the term and isn’t as comfortable using it like in the past.

Thanks, Don. Just to clarify for the readers in general, in case there’s confusion since I posted about Region 1+2 just four posts above Don’s, the +4.2 C Don posted for 1+2 is based on the traditional anomaly using 30 year base climo. The +3.5 I posted is based on taking into account warming overall mean worldwide tropical ocean temperatures to determine its anomaly. This is essentially a Region 1+2 version of Region 3.4’s RONI (called “relative”), which NOAA has decided to make official even though they continue to also update the traditional versions: https://www.cpc.ncep.noaa.gov/data/indices/rel_wksst9120.txt