FTB 09-03-2017: Heat Cranks Further; Isolated Storms Still Possible South

Issue Date: Sunday, September 3, 2017
Issue Time: 7:20AM MDT

— Flooding is NOT expected today

A persistence forecast is expected for Colorado for today. As shown in the water vapor image, below, the upper-level ridge continues to be positioned just west of Colorado. Air is being forced to subside to its east, causing very warm temperatures at the surface. Mostly sunny skies will once again quickly boost temperatures this morning, with afternoon highs topping out another 2-5 F warmer than Saturday’s already warm temperatures. Thus, highs up to 15F above normal will be possible. Fortunately, humidity values will drop enough during the afternoon to limit the heat index. Some marginal moisture will continue to remain across southern Colorado, where isolated showers and weak thunderstorms are once again expected. Rainfall rates are expected to top out at or below Saturday’s light intensity. Thus, flooding is not expected today.

As was observed on Saturday, hazy conditions are again expected in northeast Colorado as smoke particles from the WA/ID/MT wildfires gets advected into Colorado. This may actually shave off a few degrees of heat for areas that are under the densest smoke.

Today’s Flood Threat Map

For more information on today’s flood threat, see the map below (hover over threat areas for more details). For Zone-Specific forecasts, scroll below the map.

Zone-Specific Forecasts:

Southeast Mountains, Raton Ridge, Southeast Plains, San Juan Mountains:

Sunny this morning, then turning partly cloudy and hot with isolated showers and weak thunderstorms in the afternoon and early evening. Storm coverage is expected to be lower than on Saturday. Max 1-hour rain rates up to 0.35 inches. Gusty winds could accompany the strongest cells. Flooding is not expected today.

Primetime: 12PM to 8PM

Front Range, Urban Corridor, Palmer Ridge, Northeast Plains:

Sunny early, then turning partly cloudy and very warm. An isolated shower or weak thunderstorm cannot be ruled out in the higher terrain south of I-70, however, little if any rainfall will reach the surface. Flooding is not expected today.

Primetime: 1PM to 7PM

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

Sunny early then partly cloudy and hot with temperatures reaching 100+ F in the lower elevations. An isolated shower or storm cannot be ruled out across southern areas. Max 1-hour rain rates up to 0.2 inches and gusty winds will be possible with the strongest cells. Flooding is not expected today.

Primetime: 1PM to 8PM