FTB 09-23-2018: More heat with Evening Rain in the Northwest

Issue Date: Sunday, September 23rd, 2018
Issue Time: 09:15  AM MDT

 — Flooding is NOT expected today

With high pressure continuing over Colorado today, more hot and dry air is being advected into the state from the southwest. This, again, will leave most of the state with warmer than average temperatures today and very fair skies. Dewpoints will continue to be low compared to how hot afternoon temperatures will be: generally in the 20s and 30s F with afternoon high temperatures in the mid- to upper-80s. This will stifle much of the afternoon cloud development and any precipitation that might form. These low humidity values as well as increasing afternoon winds will spell elevated fire weather danger across Colorado. Wildfires, like the 3,000-acre Ryan Fire in Jackson County, will continue to grow today in the northern section of the state as wind speeds pick up.

As the afternoon fades into evening, a small upper-level shortwave will push into the northwest part of Colorado. The Northwest Slope overnight will see rainfall as dewpoints elevate and surface air is lifted as it encounters the foothills and peaks of the Northern Mountains. This change of weather will affect the entire state in the days to come, hopefully quelling fire conditions into the work week. No flooding is expected today.


Today’s Flood Threat Map

For more information on today’s flood threat, see the map below. For Zone-Specific forecasts, scroll below the map.

Zone-Specific Forecasts:

Urban Corridor, Palmer Ridge, Northeast Plains, Southeast Plains, Raton Ridge, Front Range, Southeast Mountains:

More hot and dry weather today as the upper level trough continues its hold on Colorado east of the divide. Low dewpoints will mean mostly clear skies, and daytime high temperatures will be in the mid- to upper-80s across the plains and the Palmer Ridge, Raton Ridge, and Urban Corridor, and in the 70s in the mountainous areas. No rain is forecast today, making for a great Sunday to get out and enjoy the warm weather.

Northern Mountains, Northwest Slope, Central Mountains, Grand Valley, San Juan Mountains, Southwest Slope, San Luis Valley:

Some lingering morning clouds are dissipating, and the western portions of Colorado will experience a sunny and very warm day, with temperatures in the mid-70s in the Northwest Slope and the mountainous regions, and in the 80s in the Southwest Slope and the San Luis Valley. A shortwave moving across Utah and Southwest Wyoming will enter the Northwest Slope overnight. Rain showers and occasional thunderstorms will move through the Nortwest Slope and the Northern Mountains, with rainfall rates generally below 0.25 inches per hour. Interaction with the Northern Mountains could bring brief periods of rainfall near 0.5 inches per hour. These more intense showers could fall very close to the Beaver Creek burn scar in Jackson County, but flooding here is not anticipated.

Primetime: midnight-6AM