SPM 09-07-2017: Persistent Haze with Isolated Showers in the Southern Mountains

Issue Date: Thursday, September 7, 2017
Issue Time: 10:00AM MDT

Summary:

Haze continued to plague the majority of the state once again on Wednesday with the northwest flow aloft. Most of the smoke was limited to the middle and upper levels of the atmosphere except over the Northwest Slope and northern mountains. Visibility in this region was once again limited to the 6-7 mile range. Temperatures were near normal yesterday for the eastern portion of the state with the Grand Valley reaching the low 90s once again. Overnight lows were about 5F warmer than Tuesday night.

Another quiet day of weather in regards to rainfall. The high pressure and ridging pattern to the west continues to promote subsidence and suppress advection of moisture into the state. Residual moisture further south helped in the formation of some light showers with the diurnal flow. Afternoon showers were predominantly over the San Juan Mountains with SNOTEL stations in the area recording 0.2 inches of rainfall. Radar estimates were up to 0.5 inches. Another isolated shower formed over the Southeast Mountains around 9:30 PM. Radar estimated 0.25 inches of rain over Las Animas County with a CoCoRaHS station in the area recording 0.14 inches.

There was no flooding reported Wednesday. To see if rain fell in your neighborhood, scroll down to the State Precipitation 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 6AM of the date shown in the bottom right corner. Also shown optionally are fire burn areas since 2012. The home button in the top left corner resets the map to the original zoom.

Note: We have identified a possible underestimation in QPE over the southwest part of the state. We are working to on this issue, and will provide an update as soon as possible.