FTB 09-13-2020: Another Dry Day with Warmer Temperatures

Issue Date: Sunday, September 13th, 2020
Issue Time: 09:20AM MDT

— Flooding is NOT expected today

Today will be very similar to yesterday as mainly clear skies dominate Colorado’s weather as the High pressure ridge continues its journey east over Colorado (see image below). Temperatures will continue their upward climb into the 80Fs for lower elevations today. With dew points in the 30Fs across much of Colorado this morning, some of which will mix out with daytime heating and dry air aloft, relative humidity will stay low today. The water vapor satellite image this morning shows there is plenty of dry air over Colorado (orange colors on image below). Mountain clouds and weak showers are still not out of the question, especially over the San Juan Mountains, where a slight increase in chances of measurable precipitation exists today. However, any mountain showers that do form do not pose a flood risk today due to plenty of dry sub-cloud air and low rain rates. Due to weak mid-level winds within this High pressure ridge, any mountain showers that form likely won’t move far off its mountain ignition point, which will prevent precipitation for valley locations. No flooding is expected today.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. Hover over the threat areas for more details, and click on burn areas to learn more about them. For Zone-Specific forecasts, scroll below the threat map.

Zone-Specific Forecasts:

Northeast Plains, Urban Corridor, Palmer Ridge, Raton Ridge, & Southeast Plains:

It should stay mainly clear today with temperatures ~ 5F warmer than yesterday, which should climb into the 80Fs for most plains locations. Winds should stay weak today, with general upslope flow expected from diurnal heating. Skies should generally stay smoke-free for now. No flooding is expected.

Grand Valley, Northwest Slope, Northern Mountains, Central Mountains, Front Range, Southwest Slope, San Juan Mountains, Southeast Mountains, & San Luis Valley:

It will start out clear this morning, but fair weather clouds will develop over the mountains by noon. It will be warmer today, with low-elevation valley locations in the Grand Valley, Northwest Slope, and Southwest Slope reaching into the 80Fs. Temperatures should stay cooler for high elevation mountain locations, decreasing to the freezing level near or just above the tops of the highest Colorado mountain peaks (14,000 ft). Some clouds that form over the high terrains may be able to generate some light precipitation, with the highest chances of showers over the San Juan Mountains and lower chances over the Central Mountains and southern Front Range. Due to the high freezing levels, this should mainly fall as rain. However, rain accumulation over the 24-hour period should stay below 0.1 inches and only over the higher elevations. No flooding is expected today. Skies should stay smoke-free today, but this will likely change this week, so enjoy it while you can.