Trails Coal Creek Trail – Aquarius Trailhead, Louisville, CO
Overview
Coal Creek Trail is a scenic multi-use trail that follows Coal Creek through the plains of eastern Boulder ...
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Trails 
Trails Left Hand Trailhead, Boulder, Colorado
Basic Information
Left Hand Trailhead7200–7598 N 39th St, Boulder, CO 80302
Official Site: Left Hand (City of Bo...
Trails East Boulder Trail – Teller Farm North Trailhead (Boulder, Colorado)
Overview
The East Boulder Trail is a wide, flat, and scenic trail located on the eastern edge of Boulder, Colorado.S...
Trails Dry Creek Trail, Boulder, Colorado
Basic Information
Official site: Dry Creek (City of Boulder OSMP)
Location: 6802 Baseline Rd, Boulder, CO 80303
...
Photography A Night When the Aurora Borealis Appeared Over Boulder County (November 11, 2025)
On November 11, 2025, shortly after sunset, the Aurora Borealis was observed in Boulder County.
Geomagnetic Storm Co...
Photography Increasing Trend in Sunspots and Sunspot Groups
Solar Activity
Solar activity has been increasing recently.
February 2023
The photo below shows the solar disk...
Case Studies Atmospheric Dynamics Behind the Rapid Spread of the Marshall Fire (Colorado)
Extreme Winds and Atmospheric Gravity Waves
Why did the Marshall Fire spread so rapidly?
On December 30, 2021, th...
Case Studies Potential Public Safety Power Shutoff Due to High Winds
December 17 (Wednesday) – YRAIN Analysis (2025-12-16 00z forecast)
Potential Power Shutoff Announcement
On Mo...
Gear Portable Power Stations and Flashlights for Power Outages
Joining Online Meetings During a Power Outage
Introduction
Power outages occur more frequently in the United ...
Photography Mountains Visible from Boulder, Colorado – A Complete Guide
A Guide to the Mountains Visible from Boulder, Colorado
Introduction
The city of Boulder, Colorado is well known ...