STP 08-30-2016: Same Bullseye Two Days In A Row

Issue Date: Tuesday, August 30th, 2016
Issue Time: 9:05AM MDT

Summary

A slow moving disturbance was in a position to provide favorable dynamics, moisture and upslope flow that resulted in scattered to widespread showers and thunderstorms mainly east of the Continental Divide. Activity started by late morning with northwestward-moving showers over parts of the Southeast Mountains and Raton Ridge. Shortly after noon, stronger thunderstorms began to form over the Palmer Ridge, especially El Paso County, which was hit hard with heavy rainfall, deep accumulations of hail and flooding. Highest 24-hour totals were around 2.3 inches, with most of that falling over a 1-2 hour period. In fact, many stations received over 1.5 inches of rain, which contributed to very high runoff rates. This was compounded by the antecedent rainfall from the previous day that also targeted the area, causing saturated soils and likely maximized runoff. For example, the time series below is from a USGS precipitation gage that measured 3.5 inches over a 36-hour period. Warnings products issued yesterday afternoon included areal flood advisories, flash flood warnings, flood warnings for Fountain Creek and a severe thunderstorm warning for hail. Street flooding was exacerbated by hail accumulation, leading to a few unlucky folks having to be rescued from cars.

usgs_rain

The Palmer Ridge was not the only hot-spot yesterday, as other storms were found farther north and east. Isolated rainfall amounts up to 1.5 inches were found with the strongest storms, prompting a short-term areal flood advisory. Elsewhere, the San Juans continued a string of wet days with up to about 0.75 inches of rainfall falling over favored locations. Above about 12,500 feet, graupel showers were seen that coated the higher peaks with a layer of the white stuff.

For rainfall estimates specific to your area, check out our Storm Total Precipitation map below.

STP_20160830
Storm Total Precip Legend