SPM 09-25-2018: Beneficial Rainfall as an Upper-Level Trough Migrated Eastward

Issue Date: Tuesday, September 25th, 2018
Issue Time: 09:45 AM MDT


An upper-level trough passed through the state starting yesterday morning. This meant some showers over the higher terrains to start the morning with snow above 11,000 feet. Over the eastern plains, a cold front moved through, which brought some low-level moisture to the area for afternoon storms. Not as much action over the Southeast Mountains as downsloping winds and drier low-levels prevented storm development. Over the western mountains, there was a CoCoRaHS report in northern Gunnison County that recorded 0.12 inches near Crested Butte. Radar rainfall estimates were up to 0.2 inches over the area. While not a lot of rainfall, any amount of rain helps with the ongoing drought. Gusty winds were recorded as well with afternoon gusts between 45 and 55 mph over the Northern and Central Mountains. To the east, more widespread showers and thunderstorms formed over the Front Range and Palmer Ridge. Drier air in the upper-levels mixed out most of the moisture brought in behind the front, but some high-based storms were still able to form. Totals over the Front Range were below 0.25 inches, but as storms made their way out east there was a little better moisture to increase rain rate efficiencies. A CoCoRaHS station near Otis recorded 1 inch though radar estimates were not quite this high. Flooding was not reported on Monday.

To see how much rain fell over your area yesterday, scroll down to the State Precipitation Map below.

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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 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.