FTB 08-28-2017: Strong Ridge To Continue Supporting Generally Dry Weather

Issue Date: Monday, August 28, 2017
Issue Time: 9:55AM MDT

— Flooding is NOT expected today

This morning’s water vapor image, below, continues to show the remnants of Hurricane Harvey as the dominant feature across the central United States. However, closer to home, Colorado will continue to be under the firm control of a seasonably strong upper-level ridge centered over the Great Basin. Subsidence will support mainly clear skies with a few afternoon clouds and isolated storms possible over the higher elevations of southern Colorado. Morning Precipitable Water (PW) values were 0.70 and 0.50 inches at Denver and Grand Junction, respectively. PW is expected to decrease slowly through the day as drier northerly flow is advected into the state. A weak frontal boundary, a residual from yesterday’s cool front, was noted in southeast Colorado. This is expected to “wash out” by early afternoon, replaced by the climatologically favored lee side trough across eastern Colorado. The end result will be downsloping flow that will suppress storm activity anywhere outside of the high country (mainly Palmer Ridge, Southeast Mountains and San Juans). Storms that do develop will cause brief moderate rainfall, along with gusty winds. Flooding is not expected today.

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:

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

Mostly sunny this morning, then partly cloudy with isolated showers and weak thunderstorms possible. Highest coverage will be over the higher terrain of the Southeast Mountains and Palmer Ridge. Max 1-hour rain rates up to 0.5 inches (north) and 0.7 inches (far south). Gusty winds will accompany the strongest storms. Flooding is not expected today.

Primetime: 12PM to 8PM

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

Sunny early with isolated showers and a weak thunderstorm possible this afternoon. Highest coverage will be over the San Juans. Max 1-hour rainfall up to 0.5 inches is possible. Gusty winds will accompany the strongest cells. Flooding is not expected today.

Primetime: 12PM to 8PM