SPM 09-28-2018: Dry Weather Continues with Northwesterly Flow Aloft

Issue Date: Friday, September 28th, 2018
Issue Time: 09:35 AM MDT


A few degrees warmer than average temperatures across the state on Thursday, but much closer to seasonable highs. There was a line of clouds that extended from the northwest corner of the state to Kit Carson/Cheyenne County. Other than that, crystal clear skies. The upper-level ridge was centered to our west, so northwest flow aloft continued to pull in a dry air mass. This meant no measurable precipitation across the state yesterday. Clouds increased over eastern Colorado overnight and early this morning as a shallow cold front moved through the state. Overall, quiet weather day. Just a friendly reminder that tomorrow, Colorado is looking at an increase in critical fire weather, so please tune back into the FTB for more details. There was a link added to yesterday’s nice SPM discussion about the ongoing wildfires over the state. Hopefully tomorrow’s critical fire weather won’t affect the containment of the fires, especially the gains that were made on the Ryan and Silver Creek fires.

Taking a look back at September precipitation, southeastern Colorado saw near or above average rainfall for the month. Normally, there is a peak in western Colorado rainfall (associated with the monsoon) during September. However, western Colorado continued to see dry conditions, which was highlighted in the increase in area of extreme drought conditions. October is normally a slow rainfall month across the state, but hopefully some beneficial rainfall will occur early next week as moisture from Rosa is advected over western Colorado. The Colorado Flood Threat Bulletin ends on September 30 (Sunday); however, if a flood threat appears, we will be doing special Flood Threat Bulletin(s) as warranted.

To see how much rain fell over your area the last 72-hours, 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 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 fire burn areas (post 2012), which are updated throughout the season to include new burn areas. The home button in the top left corner resets the map to the original zoom.