SPM 07-31-2017: Repeat of Widespread Rainfall

Issue Date: Monday, July 31, 2017
Issue Time: 10:20AM MDT

Summary:

Ongoing convection continued yesterday across the mountains and eastern plains. The San Juan Mountains had yet another consecutive day of rainfall and even Alamosa had some rain (0.42 inches). This is second rainiest July for Alamosa on record. Over the Front Range and Southeast Mountains, storms favored the areas that received more diurnal heating and had extra lift from elevated terrain. In the early evening, storms over the panhandle of Nebraska moved through the Northeast Plains and eventually merged along the CO, NE, KS border. Showers over the mountains quickly subsided near sunset and the threat over the plains ended by about midnight, although some showers lingered through about 2AM.

Over the San Juan Mountains, CoCoRaHS stations recorded around 0.5 inches. Radar estimates for this area were 1.1 inches. Over the Southeast Mountains, a CoCoRaHS station in Huerfano County (Walsenburg) recorded 2.33 inches. 2.28 inches of that total fell in 45 minutes. A bit further north, a gage in Fremont County recorded 0.75 inches in 20 minutes over Canon City. A gage in Manitou Springs also recorded 0.75 inches in 20 minutes. This same gage in Manitou Springs reported a storm total 1.3 inches (all of which fell in about 1 hour). Fountain Creek was running near action level again, with 1.96 inches reported falling at Fort Carson, but no major flooding of the river was reported. The river is expected to recover throughout the day. Storm totals in this area were estimated as high as 4 inches. There was another storm over Pueblo that dropped 2.2 inches of rain and there were several reports of flooded roads in town.

Over the plains, the larger swaths of heavy rainfall had 3-6 hour rainfall totals up to 3 inches. A CoCoRaHS station in Baca County recorded 2.15 inches. Over Yuma County, estimated totals were as high as 2.5 inches. Ongoing monitoring of the Arkansas River Basin will continue due to the heavy rainfall of the last couple of days. At this time, there is sufficient confidence that flood stage will not be reached.

To see how much rain fell across your area in the last 24-hours, check out the State Precipitation Map below.

Storm Total Precip Legend