FTB 08-28-2015: More Sunshine on the Way, Fewer Showers/Thunderstorms

Issue Date: 8/28/2015
Issue Time: 9:20 AM

NO FLOOD THREAT IS FORECAST.

Following behind yesterday’s disturbance/trough is a high pressure ridge that will build across the southwestern US today. The water vapor imagery below depicts the situation well, and I have annotated the image for clarity. With the building ridge will come decreasing moisture, though there will be enough remaining moisture for isolated thunderstorms mainly over the Continental Divide, San Juan Mountains, Southeast Mountains, and Front Range mountains/foothills. With northerly flow aloft expected, the adjacent Urban Corridor and western portions of the Southeast Plains should stay dry as storm motions will keep them from moving overhead.

WV_08282015

Further east over the Northeast Plains, Southeast Plains, Palmer Ridge, and Raton Ridge, a mostly sunny and dry day is expected, with temperatures climbing slightly above average for this date. An isolated thunderstorm may develop over the Cheyenne Ridge and Raton Ridge during the late afternoon/evening hours, but probability of occurrence is ~10%

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, jump below the map.

Flood Threat Legend

Zone-Specific Forecasts

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

Isolated showers and thunderstorms are expected, mainly over the Continental Divide, San Juan Mountains, Southeast Mountains, and Front Range mountains/foothills. With moisture decreasing, heavy rainfall is not expected, nor is flash flooding a threat. Maximum rain rates will be 0.5-0.9 inches/hour, with most rain rates a more modest 0.2-0.5 inches/hour.

Timing: Noon – 9 PM

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

Mostly sunny and dry for most areas, with only a slight chance (~10%) for a thunderstorm to develop over the Cheyenne Ridge and Raton Ridge. With northerly flow aloft, it will be very difficult for the Urban Corridor/western extents of the Southeast Plains to experience the common “thunderstorms drifting off the mountains.” A bit more cloud cover than other areas to the east will be about all the environment can muster.

Timing: 2 – 8 PM