STP 08-31-2015: Upper-Ridge Slid East, Deep Moisture Returned in the Southwest Flow

Issue Date: Friday, May 1st, 2015
Issue Time: 9:00 AM MDT

Summary:

As the upper-level trough pushed across the Northwestern US, the upper-level ridge that had been overhead for a few days was nudged to the east. This allowed for moisture to make a return to the state, especially west of the Continental Divide. The IPW graph below shows the return of the moisture, pushing precipitable water values at Grand Junction to nearly 1.4 inches (!) last night. This, along with other environmental factors, allowed for widespread showers and thunderstorms to return to the High Country yesterday, spilling over into the Urban Corridor and Northeast Plains this morning.

IPW_08312015

Instability was on the low side yesterday, so thunderstorms were unable to produce heavy rainfall resulting in flash flooding. Instead, areas received persistent light-to-moderate rainfall, with a few brief bouts of locally heavy rain. For a look at statewide rainfall totals, be sure and check out the Storm Total Precipitation map below.

No flash flooding was reported yesterday.

20150831_STPImage
Storm Total Precip Legend