https://www.boulderweather.com/tags/flood-history/Recent content in Flood History on BoulderWeather.comHugo -- gohugo.ioenBoulderweather.comMon, 25 May 2026 00:00:00 +0000https://www.boulderweather.com/post/september-2013-boulder-flood/Mon, 25 May 2026 00:00:00 +0000https://www.boulderweather.com/post/september-2013-boulder-flood/ <h2 id="the-storm--september-915-2013">The Storm — September 9–15, 2013</h2> <p><script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1012089347386563" crossorigin="anonymous"></script> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-1012089347386563" data-ad-slot="1011306739" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> A stalled upper-level low pressure system parked over the Great Basin tapped tropical moisture pulled north from a decaying Pacific tropical system, feeding eight straight days of orographic rainfall against the Front Range foothills. The <a href="https://www.weather.gov/bou/">NWS Denver/Boulder forecast office</a> recorded 9.08 inches at the Boulder station on September 12 alone — more than the city's typical September total in a single 24-hour window. Storm-total rainfall reached 17–20 inches in the foothills above <a href="https://psl.noaa.gov/boulder/">Jamestown and Pinewood Springs</a>, the highest five-day totals on record for the central Front Range.</p>