Later in the afternoon and into the evening, a secondary surge of activity began around 6PM as a push of very moist air, to the tune of dewpoints near 60F and precipitable water<\/span> around 1.1 inches, moved westward. Intense thunderstorms formed over the northeast part of the Denver metro area, then sent outflow boundaries<\/span> southward and westward sparking more activity over the next 3-4 hours. With rainfall falling over the most densely gaged area in the state, some very high rainfall rates were recorded. These include: numerous<\/span> gages exceeding 0.5 inches in 10 minutes, 1.8 inches in 30 minutes near Cherry Creek Reservoir, and close to 3 inches per hour just west of Boulder. Needless to say, roadway and street flooding was common across the entire metro area. Fortunately, the limited area of the heavy rainfall prevented significant riverine flooding, although some impressive spikes were seen in area stream hydrographs. For example, below is the spike on Clear Creek near the South Platte River confluence: 5 to 1000 c.f.s. in a matter of 30 minutes (provisional data).<\/p>\n
![\"clearcreek\"](\"https:\/\/archive-coftb.dewberryanalytics.com\/wp-content\/uploads\/2016\/08\/clearcreek.png\")
<\/a><\/p>\n