Author: Ben Castellani (page 1 of 22)

DayCAST: Wed 10/18/17

One reason for the recent stretch of quiet and warm weather in Colorado is that the position of jet stream is FAR to our north in Canada. Weather systems tend to form near the jet stream….along the baroclinic boundary between warm and cold air masses. Without the jet, our pattern has been quiet this week and this will continue through Friday evening.

250 mb wind map for this afternoon showing the position of the jet stream (lime green).

For today, expect mid-level clouds to dominate the sky in the morning as a swath of elevated moisture interacts with the terrain. However, drier air aloft moves in by lunch which will allow for sunshine this afternoon and evening. High temperatures will be in the upper 70’s today!

After 70’s tomorrow and possibly low 80’s on Friday, a dry cold front sweeps through Friday night. Temperatures will tumble about 20 degrees for Saturday, but at least that sun won’t stop shining…


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This week in weather: October 10, 2017

We hope you enjoyed the Columbus Day holiday! In this special weekly outlook, we provide a brief recap of yesterday’s snowstorm, announce the winners of our 2017 First Snow Contest, and detail the warm and sunny weather about to make a rebellious stand across Colorado.

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Stay ahead of the snow and help support BoulderCAST by becoming a Premium member!

*LAST SALE OF 2017 – Ends October 31ST*

With the cold and snow finally making a triumphant return, there’s no better time to unlock our Premium perks and simultaneously help to support our site. As a pre-winter promotion, we’re offering a special 30% discount on BoulderCAST Premium through October 31, 2017! Read on for the details.

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Storm Update: First snow of the season still on track

The winter storm advertised by the weather models remains on track to bring snow and much colder temperatures to the region tonight. We provide a timeline for the storm and our final snowfall forecast map.

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Bundle up! The season’s first snow arrives Sunday night

Things are about to turn white across the region as a quick-hitting storm brings freezing temperatures and snow to the Front Range. Read on for details.

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La Niña Watch in effect for this winter

It now appears we may be headed into our second consecutive La Niña winter. We discuss the forecast, remind you what La Niña actually is, and explain potential impacts on Colorado for this winter.

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*PREMIUM ONLY* Sign up to receive emails for DayCASTs!

Hooray! We’re happy to announce that we now offer notification emails to alert you when our daily forecasts are published (Premium membership required). Please fill out the form below to sign up now. You will be added to the mailing list within 48 hours.

NOTE: This email sign-up is entirely separate from any other email service with BoulderCAST.  You can unsubscribe at any time.

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Thanks to those of you that provided vigilant reminders to our team that you wanted this feature. Enjoy!

This week in weather: September 25, 2017

It truly felt like summer came to a close as Fall officially began last Friday. What a great reprieve these last few days have been! The large trough which began to influence our region last Friday will continue to be our main focus for much of the week ahead with below normal temperatures and unsettled weather prevailing across Colorado.

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Big weather changes this weekend as autumn arrives!

We’ve really been spoiled of late in regards to weather! Only a few raindrops have fallen in the last six weeks, with temperatures remaining warmer than normal on all but a handful of days. This changes on Saturday as a deep trough plows into the region, kicking the unending ridge of high pressure eastward. Cool and unsettled weather will linger well into next week. We’re also monitoring the potential for the first significant snowfall in the Mountains. We have a lot to discuss!

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“First Snow” Contest is closed. Now let it snow!

Thanks to everyone who entered our “First Snow” contest. We briefly review the entries, which surprisingly follow closely with Boulder’s climatology of late October.

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The 2013 Boulder Flood: Four years and three billion dollars later

Four years ago this week, torrential rains fell across the Front Range, triggering one of the worst floods in Colorado’s short recorded history, accompanied by a staggering repair bill now approaching $3 billion. With Boulder County at the epicenter of the disaster, the road to recovery has been long and arduous, and still continues today. We take a look back at this historic event, explain how it happened, and provide an update on related analysis performed since.

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DayCAST: Thu 09/14/17

Today will bring the best chance of precipitation for the week to the Front Range as a small but potent wave treks across western Colorado.

The 500 mb vorticity map below shows a autumn-like trough digging into the Pacific Northwest (big “L”), and also the small wave moving through Utah and western Colorado tonight (little “L”). Moisture in eastern Colorado, especially at the lower levels, will be fairly low today and tonight. The bulk of the precipitation will remain in western Colorado and Wyoming.  However,  there will be a decent chance of storms today across the Metro area…maybe 20% between 3PM and midnight this evening as the disturbance approaches.  Highs will be cooler today in the low to middle 80’s with mostly cloudy skies developing by afternoon.

This big trough across the Northwest is actually cold enough for snow in the higher elevations of western Wyoming and Montana! Those wondering when snowfall may return to our Mountains should keep an eye on the middle of next week as ensembles are coming into agreement for an even colder and deeper trough developing across the West…

LEFT: 500 mb height anomaly for the middle of next week from the ECMWF. RIGHT: GFS ensemble 850 mb temperature anomaly


Remember, these daily forecasts are Premium content. Periodically, we open this forecast up to all of our readers. Today is one of those days!

Sign up today to get the best BoulderCAST experience, including these forecasts every day, extended and enhanced graphical forecasts, chat room and forum access, complete 6-day hiking forecasts, early viewing of select content and much more!

In celebration of the recent introduction of our SummitCAST hiking forecasts, use the promo code SUMMIT15 to receive 15% off our annual subscription. LEARN MORE

This week in weather: September 11, 2017

A warm and fairly dry week is expected across the Front Range. However, we’re once again watching the tropics this weekend for another East Coast landfall and one storm which could impact Colorado. Read on for details.

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