SPM 09-11-2019: Thunderstorms and Gusty Outflow Winds Returned to Western Colorado

Issue Date: Wednesday, September 11th, 2019
Issue Time: 10AM MDT


A shortwave out in front of the main trough worked its way over the state yesterday and help produce some widespread showers and weak thunderstorms over western Colorado. Storm movement to the northwest was fairly quick and with a bit drier air in place (limited moisture with the plume), totals were on the low to moderate end with some gusty outflow winds. Wind gusts between 45 and 55 mph were recorded over the northwest quadrant of the state during the afternoon. A stronger thunderstorm near Grand Junction had up to half inch hail and produced 0.65 inches of rainfall. With 43 mph winds also recorded at the airport, a Severe Thunderstorm Warning was issued. Gages from various networks over the western high terrains had between 0.15 and 0.45 inches.

A storm also formed over the Front Range and moved into the Urban Corridor near Greeley. Totals up to 0.55 inches were observed (CoCoRaHS) with MetStorm estimating around the same. Large hail (1.75 inches; golf ball) was also reported with this thunderstorm at 6:30PM MDT. Lastly, weak thunderstorms moved in from New Mexico over the Southeast Plains (southeast corner) along a dryline. A couple rounds of storms ensued from mid-afternoon until about midnight. MetStorm estimates up to 1.25 inches fell in the cores of these storms.

Flooding was not reported yesterday, and to see estimated precipitation totals over your area of town yesterday, scroll down to 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 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 vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.