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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 4h

🏔️ ⬅️ Deep upslope flow is present over the Front Range today with thick clouds blanketing the area, but will it actually rain? Best chance of a light pavement wetting through the afternoon and evening remains south of I-70... #cowx #denver #weather

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 8h

Today’s *Premium* storm update breaks down how this once‑promising setup unraveled, why southern Colorado is now squarely in the bullseye and what scraps of moisture the Front Range can still squeeze out as the system passes by to our south: bouldercast.com/storm-update... #COwx #Denver

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 21h

It's better to have had the chance of rain and lost it than to never have had the chance at all.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 23h

💦 Polo's remnants getting rapidly pulled northward toward the American Southwest. Flooding ongoing across large portions of New Mexico and Arizona this evening. #COWx #NMwx #AZwx #Polo #FlashFlood

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 23h

New rainfall projections are in for the Boulder-Denver area. Beneficial rain is nearly off the table now. Best chance to see rain is south of I-70 Wednesday afternoon and evening. Further north and west you are, the greater the chance you may be skipped entirely. #COWX

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

Two baldies high up in a dead tree, enjoying the quiet Tuesday afternoon, watching over a dry, barren field of prairie dogs #cowx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

This is still a significant, potentially life-threating event for much of southern Colorado

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

TUESDAY 9/29 3:00PM UPDATE: Goodbye, Flood Watches! It's not often you see a Flood Watch cancelled, but that's how this storm is going. The four zones closest to Denver have been dropped as the big, wet Southwest soaker trends further southeast away from the Front Range. #COWX #Colorado #denver

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

And apparently it's turned into a really nice Tuesday afternoon...😩 #COwx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

📉 Another storm collapse seems imminent for the Front Range as the more southern track of #Polo's remnant low appears favored. The trusty Euro model was one of the few showing a deluge in #Denver all along. It's now joined the drier crowd in its last few runs. #COWX #Colorado

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 29/09/2026

TUESDAY 9/29 10AM UPDATE 💦🌀 Will it be a soaker or a near miss for Denver? We break down why the models are struggling, what the key track differences mean for your neighborhood & where flooding and snow may become real concerns as the storm unfolds: bouldercast.com/a-soaker-or-... #COwx #Colorado

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

No, but we'll need to watch backdoor cold fronts early in October. It only takes one decent dry front to come into the middle of the country and we could see a single morning of frost this time of year.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

That said, there's still an almost comical amount of model uncertainty in rainfall amounts for the Denver-Boulder area, from 3 drops to 3 inches, which will land on the northern fringe of the storm near or within a very sharp gradient in rainfall potential.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

MONDAY 9/28 1PM UPDATE: Flood Watches continue to creep northward in Colorado for this week as it becomes more certain that the heaviest bands of rain will setup further north Tuesday night through Wednesday. #COwx #Denver #colorado #weather

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

We already squandered the usual August El Niño precipitation buff. Is October to follow?

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Nothing screams fall like a huge, persistent Western heatwave for the first half of October... #COWx #Colorado #Drought #Denver

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Well, at least all of Colorado has received at least 2 inches of rain this summer! Wait... #COWX #Boulder #Weather

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Now Category 3 Hurricane Polo will make landfall in Baja California later today before moving across the very warm Gulf of California into Sonora as it weakens. Polo has definitely taken the scenic route on the way to influencing Colorado's weather... #COwx #polo #colorado #Monsoon

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

With a high of 85° on Sunday, Boulder has now tied its FULL calendar year record for number of 80° days at 128 (with 2024) 🥵🏆 This count will undoubtedly increase with a warm, dry first half of October expected in the Front Range 📈 #COWx #Boulderwx #Denver #Colorado #Hot2026

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

The good news? The forecast gets considerably quieter late week, with drier weather and warming temperatures returning by Thursday and Friday. This first week or two of October will feature rather mild, mundane weather as this impressive late-season monsoon finally calls it quits to 2026☀️

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Meanwhile, the highest peaks in the San Juans and Sangres could pick up several inches of wet snow above 12,000 feet❄️

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Southern Colorado has a much higher confidence of significant rainfall (and flooding), while the Front Range could see a wide range of outcomes. A sharp cooldown is also expected, with temperatures dropping 10–15 degrees below normal by midweek.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

For Boulder and Denver, the big question is how much rain we actually get. Forecast guidance remains all over the place, with the eventual track and interaction of these systems determining whether we see a soaking rain or something more modest.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

A complicated weather pattern is taking shape across Colorado this week as a deep low pressure system dives into the Southwest and interacts with the remnants of Hurricane Polo. That combination will pull an unusually deep plume of tropical moisture northward into eastern Colorado.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

FRONT RANGE WEATHER UPDATE MONDAY 9/28 8:00 AM MDT A Big Soaker for the State This Week, But Denver’s Forecast Remains Uncertain 🌧️ #Cowx #colorado #denver #weather #Monsoon #Polo

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Areas south/east of Denver most favored for potentially 1"+, chances drop quickly heading north of I-70

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

UPDATE: SUNDAY 9/27 5:30 PM ☔️ Quick Thoughts on Heavy Rain Potential This Week We're continue to track the potential for widespread, soaking rainfall in the Denver Metro area later this week .... 😀 #COWX #Denver #colorado #weather

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 28/09/2026

Denver received more rain on Friday (1.10") than Boulder has had in the last 9 weeks combined (0.96") #COWx #Denver #weather

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 26/09/2026

✅ Weekly outlook forecast verification for September 21-25, 2026. Forecast issued 8AM Sep 21st. Boulder official climate site (when possible) used for verification. ☔️ 3 days of rain = 0.10" Boulder, 1.18" Denver 🎯17° total error, largest Friday #COWx #Monsoon #Colorado

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 26/09/2026

About an hour of steady light rain in the books in Boulder. Best rain of the week. Could have been better. #cowx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

In this scenario it would as it gets entrained into a cut off low in the four corners Ina sweet spot for Front Range upslope

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

3:40PM FRI 9/25: Rain and thunder. Pockets of heavy rain, gusty winds, small hail, and a sprinkle of landspouts. #cowx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

2:15PM FRI 9/25 UPDATE: A nice-looking line of showers and thunderstorms are building across the higher terrain now and will be pushing through Boulder/Denver soon, then gone by early evening. Brief heavy rain, gusty winds, small hail, localized flooding possible #COWX

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

180 MPH winds.... Beautiful yet terrifying.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

Current odds of this happening just right are about 15% based on latest ensembles and cluster analysis #COWX

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 25/09/2026

The Euro model continues to advertise the remnants of Category 5 Hurricane #Polo making a beeline directly into the #Denver area next week leading to several inches of rain and heavy mountain snow across #Colorado. Still a fairly low-chance outcome, but we will be watching #COWx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

September 24th throwback. Can you guess the 14er? #COWx

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

🌀 Rachel (Not Formed Yet): High chance a new tropical cyclone will form in the wake of Polo early next week from a promising tropical wave. It would follow a similar track paralleling the coast towards or into the Baja.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

🌀 Polo (155 MPH Cat 4): Big rain today on the Mexican coast, before heading away from shore and eventually making a hard turn back into the Baja, making landfall as a Cat 2 or 3 hurricane on Monday. Remnant moisture may funnel into the SW USA early to middle of next week (Colorado included)

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

🌀 Odalys (90MPH Cat 1): Expected to remain weak hurricane and weak eventually early next week offshore. No real impact other than helping to steer Polo towards the Baja via a Fujiwhara interaction.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

🌀 TS Nolo (60MPH): Expected to become major hurricane just skirting south of Hawaii. Huge impacts on the Big Island with 10 to 25 inches of rain, locally up to 35 inches. And huge surf.

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BoulderCAST Weather 🏔️⛈️ @bouldercast.com · 24/09/2026

.....PACIFIC TROPICAL UPDATE.... The ongoing historic El Niño event is keeping the eastern Pacific very active in late September... #COWX

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