SPM 08-10-2019: Flash Flooding over El Paso and Pueblo Counties

Issue Date: Saturday, August 10, 2019
Issue Time: 10:10 AM MDT

Summary:

Upslope flow aided by a passing shortwave created heavy rainfall over El Paso and Pueblo Counties yesterday from 1PM to 5PM. A trained spotter reported heavy rainfall of 1.98 inches over the 4-hour period to the NW of Pinon in northern El Paso County. The heavy rainfall lead to two reports of flash flooding over the area, with part of Young Hollow Road washing out and high waters between 6 and 10 inches over the roadways in the area. Radar derived up to 2.5 inches of rain. Thankfully no injuries were reported within the flooded areas. A flash flood warning was also issued over the Spring Creek burn area around 4PM yesterday, with heavy rainfall over the southeast portion of the burn scar. A CoCoRaHS station on the southern edge of the burn area reported a 24-hour total of 0.85 inches, but two stations near and within the burn area reported only 0.23 and 0.42 inches, implying that the heaviest rainfall narrowly missed the burn area. There were no reports of flash flooding. The Denver metro area also saw some rainfall last night around 8PM, with an UDFCD Alert gage reporting 0.24 inches near Utah Park in Arapahoe County. Multiple rounds of weak storms to the east of Longmont recorded 0.34 inches around 8PM as well. CoCoRaHS stations near the area reported 24-hour totals up to 0.89 inches.

Back to the west heavier rainfall fell over the Southwest Slope and San Juan Mountains. Persistent storms over northern La Plata County produced two reports of heavy rainfall of 0.75 and 0.63 inches over and to the south of the 416 burn area. A flash flood warning was issued by the NWS over the 416 burn area, with emergency management reporting high flows in nearby canals and ditches. Another notable rain report came in from the Lujan RAWS station in NW Saguache County of 0.45 inches. Storms moving over the San Luis Valley produce rainfall again over the normally dry area, with 0.14 inches reported in Alamosa. Most other areas of the high country stayed dry yesterday, with only trace amounts reported over the 24-hour period.

For a look at precipitation over your area, please visit 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.