A larger cluster of thunderstorms developed just east of the Continental Divide<\/span> and rolled through the Denver metro before continuing eastward over the plains of eastern Colorado. A few small storm cells prompted Flood Advisories from NWS<\/span> Boulder over Boulder and Weld counties, where over 0.5 inches of rain were estimated. A CoCoRaHS<\/span> observer in Lyons, CO reported 0.69 inches of rain over 30 minutes in northern Boulder County within one of the Flood Advisory areas. An ALERT gauge just south of Lyons reported 0.71 inches of rain. Western portions of Fort Collins received up to 0.67 inches of rain according to rain gauges in the area, and the heaviest rain fell over Elbert County (1.8 inches) as storms moved just east of the Urban Corridor. A few other gauges over the Palmer Ridge picked up over 1 inch as well. Flooding was not reported over these areas.<\/p>\n Later evening storms also fired over the Southeast Mountains before tracking southeast over the Raton Ridge and Southeast Plains. These storms brought another flash flood<\/span> warning<\/span> for the Spring Creek burn area, and a flash flood<\/span> was reported on the southwest side of the burn area in northeast Costilla County. This is the same area that had issues on Monday. A rain gauge near the flash flood<\/span> report only reported 0.38 inches of rain, and with relatively quick motion, guessing this was over a short period of time. This also indicates that flash flooding<\/span> is occurring from the lower rain totals due to saturated soils from the heavy rain over the last several days. Again, this lines up with the flash flood<\/span> report from Monday.<\/p>\n The last 6 days have been quite the rainfall eventful for Colorado. The image below shows the AHPS observed precipitation estimate over the last 7 days, which covers this rainy period. Below is a summary of some observations and rain totals from this 6-day event:<\/p>\n • San Juan Mountains: 6-day rain totals = 3 – 4 inches (southwest & southeast), 2-3 inches (east & north)
\n• Southwest Slope: 6-day rain totals = 0.25 inches (southwest) to 3 inches (southeast)
\n• San Luis Valley: 6-day rain totals = 0.5-1.5 (interior), 2-3 inches (western & eastern edges)
\n• Southeast Mountains: 6-day rain totals = 2-4 inches (highest totals along crests of Sangre De Cristo Mountains)
\n• Numerous<\/span> debris slides across San Juan Mountains, resulting in hikers being stranded and rescued near Silverton & Telluride
\n• Local rivers and streams have swelled over 90th percentile flows over Southwest Slope and San Juan Mountains<\/p>\n
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