STP 09-30-2015: Moisture and a Corridor of Instability Produced “End of FTB Season” Fireworks

Issue Date: Wednesday, September 30th, 2015
Issue Time: 9:00 AM MDT


In the wake of Monday’s cool front, moisture was pooled across eastern Colorado, from the plains and back into the Front Range/Southeast Mountains. After the morning clouds cleared along and near the higher terrain, daytime heating was able to develop a corridor of instability along the Front Range, Southeast Mountains, and Urban Corridor. These two ingredients, plus a little help from a weak upper-level disturbance, promoted the development of isolated thunderstorms (a couple were severe). Severe storm reports from the Boulder and Pueblo National Weather Service offices are as follows:

1.0 inch hail: 1 mile W of Centennial (Arapahoe), 1 mile W of Lakewood (Jefferson), 9 miles N of Golden (Jefferson), 1 mile ENE of Florence (Fremont)
1.25 inch hail: 1 mile ENE of Highlands Ranch (Douglas)
1.50 inch hail: 2 miles WNW of Lakewood (Jefferson)

No flash flooding was reported/observed yesterday. Please see the STP map below for a look at precipitation totals from the last 24 hours.

Storm Total Precip Legend