Wednesday Afternoon Model Update

10/21/26 Wednesday 12:30 pm

The models initialized pretty well on rain start times across the forecast area.  That is encouraging or scary depending on your perspective.

While I am thinking about it, keep this in the back of your mind. If you have watched any weather media lately, you have probably heard about Super Typhoon Champi (pronounced Chompy). Champi is big enough that it could recurve all the way from Asia to Alaska’s Bering Sea, wreaking complete havoc on the fishing fleet (probably ending up in next year’s Deadliest Catch episodes).

From there it could slide down the Canadian Coast, then the Pacific Northwest Coast, slide all the way down to the Central/Southern California Coast, and end up as a big storm in our backyards. I don’t have models that track that far yet; this is pure intuition.  I might be wrong; I’ll have a better idea in 7-10 days when the models can pick it up.

I got dangerously close to heading down the rabbit hole there…

The WPC NOAA Weather Prediction Center) finally updated their ERO (Excessive Rain Outlook) today; nothing like waiting until the last minute.

Here are the latest crazy model runs. I will not be surprised when the reports are logged if we see totals higher than forecast guidance.

These forecast totals run from 6 am this morning through Sunday night.

T=Telluride C=Cortez M=Mancos D=Durango B=Bayfield P=Pagosa Springs WC=Wolf Creek Pass

NBM

German

GFS AI

European

Canadian

I’ll be back in the morning.

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Wednesday Flood Potential

10/21/26 Wednesday 9 am

Before I get started, I have received many emails asking about the area in and around Vallecito and Lemon Reservoirs. First, I was as surprised as everyone else. Perhaps it will be more like when than if. We will see.

Los Pinos, Florida, and Vallecito Creek all have gauges and are tracked by the River Forecast Center. I can monitor flows. So if they somehow dont catch the rising flows, I can let everyone know what I am seeing on the near-live observations.

I won’t share the little graph portion anymore, just the data. Two changes: La Plata River at Hesperus and the Animas at Cedar Hill, near the New Mexico border, are now forecast to be above action stage at peak flow. Action stage means you should monitor the situation closely, and you may experience minor flooding in low-lying areas.

All of these peak times are subject to change by NOAA’s River Forecast Center.

On these data boxes next to “Forecast Peak in the parentheses have the projected time and date of the peak. In the example below for Animas Durango, it is (10/24/00z). That is 6 pm Friday.

 Animas Durango near Science Center:

Notice the forecast peak has increased and sits (for now) a couple of inches or less below action stage. If you are close to creeks that flow into the Animas, I suggest you come up with a game plan.  Or contact the County EMS. This also applies to the Trimble area and areas along 550 between Trimble and Animas City.

Forecast Date: 2026-10-21 15:00Z
Forecast Peak: 6.97 ft, 7213 cfs (10/24/00Z)
Critical Stages/Flows: Flood: 8.0 ft, 10000 cfs – Action: 7.0 ft, 7288 cfs
Current Observation: 3.54 ft, 1142 cfs (10/21/14Z)

 

La Plata River at Hesperus: The forecast peak has increased above the action stage.  Peak is forecast for Friday at 6 am

Forecast Date: 2026-10-21 15:00Z
Forecast Peak: 5.07 ft, 487 cfs (10/23/12Z)
Critical Stages/Flows: Flood: 5.5 ft, 685 cfs – Action: 5.0 ft, 453 cfs
Current Observation: 3.94 ft, 71 cfs (10/21/14Z)

 

Mancos River in Mancos is no longer on the list. I don’t understand enough about it to explain why. I am just telling you what their models are predicting.

 

La Plata River at CO/NM state line: Is still right below action stage. The peak is forecast for Friday at noon

Forecast Date: 2026-10-21 15:00Z
Forecast Peak: 7.73 ft, 802 cfs (10/23/18Z)
Critical Stages/Flows: Flood: 9.0 ft, 1220 cfs – Action: 8.0 ft, 884 cfs
Current Observation: 3.62 ft, 10 cfs (10/21/15Z)

 

Animas River at Cedar Hill near CO/NM border: Forecast peak has increased. It is now above the action stage. Forecast peak is Friday at 10 pm.

Forecast Date: 2026-10-21 15:00Z
Forecast Peak: 9.59 ft, 7760 cfs (10/24/04Z)
Critical Stages/Flows: Flood: 10.5 ft, 10411 cfs – Action: 9.5 ft, 7524 cfs
Current Observation: 5.75 ft, 1281 cfs (10/21/15Z)

 

San Juan River at Pagosa Springs: The forecast peak remains above flood stage. The peak forecast is Friday at 6 am. If this verifies, it will be the 10th highest peak on record for this location. 1 through 8 were decades ago. 9th highest occurred 5/23/2005.

Forecast Date: 2026-10-21 15:00Z
Forecast Peak: 10.73 ft, 4705 cfs (10/23/12Z)
Critical Stages/Flows: Flood: 10.5 ft, 4477 cfs – Action: 9.5 ft, 3487 cfs
Current Observation: 5.51 ft, 470 cfs (10/21/15Z)

 

My next weather model update will be out around 2-3 pm.

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Wednesday Morning

10/21/26 Wednesday 3:30 am

 Overview

Showers should start moving into the western forecast area this morning, then late morning to around noon across the northern and central portions, and early afternoon in the eastern portions. At least that is what the latest models are forecasting (so it could change a bit)

I have very few changes overall. One thing I am watching is dropping snow levels for Saturday and Sunday. This could change, but for now it looks like they could drop below pass level.

I have given it thought, and I have decided not to treat the weekend totals as a separate event. Models don’t always do a great job defining start and stop times, especially with successive systems.

That is why, even though they are different systems (one ending Friday afternoon and another starting Friday evening), we’ll use model guidance for totals between now and Monday morning. As I said, I am more concerned with the overall totals than trying to determine starts, stops, and lulls.

We have a lot of new people and some longtime followers who need a refresher, so I made cheat sheets for the forecast maps.

T=Telluride C=Cortez M=Mancos D=Durango B=Bayfield P=Pagosa Springs WC=Wolf Creek Pass

Going forward, I will include these “cheaters” every time I post forecast maps. All of these maps show total liquid equivalent precipitation from Wednesday through Sunday evening

German Model: Further clarification on map locations correlated with forecast amounts shown. 1.65=Telluride, 2.46=Cortez,  5.44=NE of Bayfield near Upper Pine Fire Station number 8, 5.74=Pagosa Springs

NBM (model)

European Model

Canadian Model-Crazy!

GFS AI

I’ll update flood potential mid-morning when the new data is out. I am curious to see if there are any new additions to what we saw yesterday.

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