SPM 09-10-2017: Increase in Shower Coverage

Issue Date: Sunday, September 10, 2017
Issue Time: 10:10AM MDT

Summary:

With the ridge over Texas and upper-level trough over the west coast, more southerly flow brought an increase of moisture into the southern portion of the state. The influx of moisture, however, was minimal with dew points reaching the mid to upper 40s. This translated into another day of high-based showers and thunderstorms with gusty winds. The storms that initiated over the high country were more numerous than the previous days with this slight increase in moisture. As storms began to move off the mountains in the afternoon, they favored the higher terrains of the Cheyenne and Palmer Ridges.

Meteorological stations over the mountains recorded storm totals greater than the last couple of days with the slight uptick in moisture. A couple SNOTEL stations recorded 0.4 inches with other stations recording around 0.5 inches. The highest storm report was in Fremont County where 0.6 inches was recorded along with small hail. Over La Plata County, 0.41 inches was recorded by a CoCoRaHS station. Radar rainfall estimates were on par with these observations. A few isolated storms were able to briefly survive over the eastern plains where radar estimates were just over 1 inch. All storms ended a couple hours after sundown with the decrease in instability. There was no flooding reported Saturday.

For rainfall estimates over the state yesterday, take a look at the 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.