SPM 09-30-2017: Rain And High Elevation Snow Mainly Across Western Colorado

Issue Date: Saturday, September 30, 2017
Issue Time: 10:45AM MDT


Unsettled weather continued for Colorado as a large-scale trough continued to envelop the western United States. Over the last week, temperatures have ranged anywhere from 2 to 10F below normal across the state (see below), one indicator of frequent cloud cover that has limited heating.

Despite the active weather, rainfall rates continued to be limited due to weak instability and limited boundary layer moisture. Isolated twenty four rainfall amounts up to 1 inch occurred over the higher terrain of southwestern Colorado on Friday. However, hourly rain rates were limited to less than about 0.4 inches. Despite the limited instability, a few reports of small hail were reported along the counties by the New Mexico border. This was probably more of a testament to low freezing levels than atmospheric instability.

Flooding was not reported on Saturday. For rainfall estimates in your area, check out our State Precipitation Map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The accumulation ending time is 6AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas since 2012. The home button in the top left corner resets the map to the original zoom.

Note: We have identified a possible underestimation in QPE over the southwest part of the state. We are working to on this issue, and will provide an update as soon as possible.