SPM 09-20-2020: Light Showers Bring More Wind Than Rain & Local Smoke Continues to Impact Air Quality

Issue Date: Sunday, September 20th, 2020
Issue Time: 10:00AM MDT

Summary:

Showers moved through northwestern Colorado yesterday and last night with an advancing trough, but precipitation stayed weak. This morning, rain gauges are reporting up to 0.08 inches of rainfall over the Northwest Slope, Northern Mountains, and Central Mountains regions. We will take what we can get, but this is not much of a beneficial rainfall.

Along with showers, winds gusted up to 56 mph, which did not help the fire situation. Fortunately, the increased humidity kept fire activity low for the current Colorado wildfires (see update below). The Mullen Fire in southern Wyoming was not so lucky as a significant smoke plume could be seen streaming northeast of its location in the Medicine Bow Mountains, indicating rapid fire growth. In fact, fire fighting resources were pulled back due to the strong and erratic winds for the Mullen Fire. Although the advancing trough was able to push the thickest smoke east out of the state, smoke from the Mullen Fire is still impacting air quality for select locations in the northern Urban Corridor (see image below). Air quality monitors in Greeley and Longmont are both showing Unhealthy levels, whereas Boulder air quality is actually in the Good levels. We just can’t seem to escape wildfire smoke this year.

Ongoing Colorado wildfires update (as of 9:55AM from InciWeb):
Middle Fork in the Park Range: 5,837 acres; 0% contained
Cameron Peak in the Medicine Bow Mountains: 102,596 acres; 15% contained
Williams Fork in the Arapaho National Forest: 12,320 acres; 16% contained

For precipitation estimates in your neighborhood over the last 24, 48, and 72 hours, check out our 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 24-hour, 48-hour and 72-hour total precipitation contain bias corrections that are not disaggregated into the hourly estimates, so there will likely be some differences. 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.