SPM 07-15-2022: High-Elevation Monsoon Storms; Drought Monitor Update

Issue Date: Friday, July 15th, 2022
Issue Time: 11:00 AM MDT

Summary:

The North American Monsoon continues to bring moisture to western and central Colorado, and by early afternoon daytime heating induced storms in the high elevations of the San Juan, Southeast, Central, and Northern Mountains, as well as along the Front Range. General eastward progression then pushed storms onto the Urban Corridor, Palmer Ridge, and Eastern Plains by evening, increasing in coverage as well.
While the severe threat was limited yesterday, some storms were still able to produce localized heavy rainfall, gusty outflow winds, and small hail. A report of 0.25 inch hail was made in Vail and a CoCoRaHS observer left the following remark:

“After waiting all afternoon for the forecasted rain, the very intense storm arrived about 5:10 pm. The storm was fast moving but wild with very heavy rain, hail, and wind. the rain came down in sheets and the noise from the rain on the roof was so loud we couldn’t hear the news on the TV. ”

Their station saw 0.28 inches of precipitation yesterday.  Further east, A 58-mph thunderstorm wind gust was reported at the Air Force Academy in Colorado Springs, which saw 0.32 inches of rain as well. Some other notable rainfall totals around the state include:

  • 0.74 in Woodland Park (CoCoRaHS)
  • 0.69 in Gould (CoCoRaHS)
  • 0.63 in Bonanza (CoCoRaHS)
  • 0.61 at Colorado River near Cameo (USGS)
  • 0.59 at  Silver Jack Reservoir near Cimarron (USGS)
  • 0.56 in Pagosa Springs and Westcliffe (CoCoRaHS)

A flood advisory was issued for a small portion of Grand County, including a part of the East Troublesome burn scar. USGS gauges on the East Troublesome scar and near Grand Lake saw only Trace-0.02 inches yesterday, with similar observations from CoCoRaHS and available on the MesoWest network. No flooding was reported. However, much of the high elevations have remained under Flood Watches for the past several days, especially the vulnerable burn scars. 72-hour QPE from MetStorm Live (bottom of today’s post) indicates areas of up to 2 inches of rain over the northern portions of the East Troublesome scar, and widespread 0.5 inches of rainfall on Cameron Peak.

This morning CDOT reported a rock slide on US50 between County Road 157 and CO69. It is unclear if this is flood related, but Cotopaxi (a bit south) saw 0.18 inches of rain yesterday. Based on the report from Luke Victor below, there were little transportation impacts.

It was hot and dry for Eastern Colorado, with highs in the upper 90s and low 100s in the Urban Corridor, Eastern Plains, and Raton Ridge. Slightly lower temperatures, mid-90s, were seen the Palmer Ridge. A bit of relief from the high temperatures came for Southeast Plains following an outflow boundary from yesterday’s storms, as seen in the radar imagery and temperatures tables from PUB below. A hay bale-induced grass fire was ignited yesterday afternoon north of Joes (Yuma County). Thankfully no additional damage has been reported with that fire.

Reminder, if you observe flooding in your area you can use use the “Report a Flood” page to submit flood reports when you can safely do so. For precipitation estimates in our area, check out the map below.

Click Here For Map Overview

The map below shows radar-estimated, rainfall gage-adjusted Quantitative Precipitation Estimates (QPE) across Colorado. The map is updated daily during the operational season (May 1 – Sep 30) by 11AM. The following six layers are currently available: 24-hour, 48-hour and 72-hour total precipitation, as well as maximum 1-hour, 2-hour and 6-hour precipitation over the past 24 hour period (to estimate where flash flooding may have occurred). The accumulation ending time is 7AM of the date shown in the bottom right corner. Also shown optionally are vulnerable fire burn areas (post 2012), which are updated throughout the season to include new, vulnerable burn areas. The home button in the top left corner resets the map to the original zoom.