Ben Bleiman

Ext ens have been consistently hinting at this for the past 2+ weeks. Cautiously optimistic.

Fantastic waterspout in front of Cetraro, Calabria. Photo by Albertina Pepe

It was even visible on satellite this morning!

Gotta love DIA snow/precip measurements...

✅ Boulder 1.4" of snow, 0.07" of liquid = 20:1 snow ratio

🤷‍♀️ Denver 1.7" of snow, 0.02" of liquid = 85:1 snow ratio

#COwx #Boulderwx

7th day at 60°+ this month, 25 of the last 36 days have been at 60°+ in Denver. This winter is stupid.

#COwx

Same with much of the southwestern US! Wow

To be fair, models have been locked on that Jan 8-11 storm for multiple days already.

Lenticular-ish KH wave spotted 12/24 near Nederland, CO

Snapshot of PDS Red Flag Warning from National Weather Service in Boulder, CO. The text begins: URGENT - FIRE WEATHER MESSAGE National Weather Service Denver/Boulder CO 508 PM MST Thu Dec 18 2025 ...THIS IS A PARTICULARLY DANGEROUS SITUATION FOR IN AND IMMEDIATELY ADJACENT TO THE FOOTHILLS, BETWEEN 5500 AND 9000 FEET, FOR BOULDER AND JEFFERSON COUNTIES ON FRIDAY... Strong west winds, sustained 45-55 mph with gusts upwards of 85-105 mph, are expected in the foothills of Boulder and Jefferson Counties beginning early Friday morning. Relative humidity values are expected to drop into the low teens, possibly upper single digits. While Red Flag conditions, critical fire weather, are expected across a larger area in northern Colorado, the most extreme conditions are expected to be along Highway 93 from Jefferson County into Boulder County and along US-36 north of Boulder to the Larimer County line and westward. There will be a high potential for fast moving wildfires...

NWS in Boulder, CO has just issued a rare "Particularly Dangerous Situation" (PDS) Red Flag Warning for extreme fire weather risk on Friday. Historically, PDS RFW issuances (including in California) have pinpointed days on which the most dangerous wildfires have occurred. #COwx

Officially our 6th-straight day at 60°+ in Denver.

We’ll tie our longest 60°+ December streak tomorrow, and break it on Tuesday.

#COwx

Never, ever gets old

What are some good sources of discussion on current oscillations/teleconnections and their forecast progression? Particularly for western US weather. CPC prognostic discussions sometimes cover these. The ENSO blog is no longer active. Any others?

Can you find the climatological anomaly on this map 😂

Has Cheyenne been issuing WWA for small, sub-county zones like this for a while? I was impressed when the Chicago office split up Cook County into three zones 😂

Albuquerque had consistent and overall above average dew points almost all monsoon season. Despite that, we ended up 1.41" below average with 3.07" of rain this year. The 32nd driest monsoon on record of 134 years. It was also the 5th warmest.

☔️ It's Denver's wettest day in over 2 years! ☔️

1.21" of rain at Central Park = wettest day there since July 5, 2023 (811 days).

#COwx

Tornado near Pleaant View, Colorado this afternoon…near the Utah/Colorado line in southwestern Colorado!

📸: Landan Wilson

Fresh snow just above Telluride this morning!

Looks like it got down to about 11k feet!

#COwx

Nine years ago, an EF-2 tornado struck mainly rural SE Champaign County, Illinois

It was just an ordinary late-summer evening in #Boulder, until it wasn't...

How it started: ⛰️⛅️😎
How it ended: 🌫️😶‍🌫️😷

#COWX #Smoke #ThanksCanada

Wouldn’t mind a few more big thunderstorms, then I’ll be ready for winter!

My favorite type of abnormal

Amazing compositions

Was not expecting structure on my walk home from work today. #cowx

Champaign is 10” below the average for this time of year??

Another fun chase on the CO High Plains today. This high precipitation beast was fairly fast-moving for most of the afternoon. Produced what appeared to be a brief gustnado around 4:37 pm (pic 1). Tried to wrap up around 5:10-5:20 pm with ground-scraping scud (pic 4) before cold pools merged. #cowx

Possible gustnado viewed from 2 miles W Arriba, CO looking due N 4:39 pm #cowx

Storm getting its act together 1 mile N Limon, CO 3:55 pm #cowx

Great day for structure. Followed these storms for about 5 hours today from the Palmer Divide to Haswell, CO. Second storm gave it a good try at producing for about 10-15 minutes around 5:30 pm. #cowx

Critical Hurricane Forecast Tool Abruptly Terminated U.S. Department of Defense announced Tuesday it would no longer process and deliver data essential to most hurricane forecasts

A huge blow was dealt to hurricane forecasters this week as a critical tool was abruptly terminated by the Department of Defense and NOAA. The immediate discontinuation of data from three weather satellites will severely impact hurricane forecasts this season and beyond. More ⬇️