FLOOD THREAT BULLETIN (For Twitter Updates follow @FloodDSS and @COFloodUpdates)

The CWCB offers a daily assessment of flood potential around the state, issued at 11:00 am each day from May through September.

This product is issued daily before 11:00 am and is used to identify areas of the state that are at risk of flooding.  Updates can be issued as needed by weather situation.

This product is an outlook of the flood threat and precipitation amount and chance in the state over the next 15 days.

This map is created by merging the 24-hr Storm Total Precipitation (STP) product observed regional WSR-88D and the MADIS observational database. Issued at 9:30 am every day.

Issue Date:  Thursday, Aug. 21, 2014
Time Issued:  10:40 AM MDT
Forecaster:  Brad Workman



Southwesterly flow aloft will continue today, as the upper-level low that has been mentioned in the last few forecasts continues to churn over southern California and the Baja Peninsula, slowly nudging to the east. Drier air has continued to filter into the state from the southwest, which has decreased IPW values below 1 inch at all 5 of the usual reporting stations. Pueblo remains the highest at nearly 1 inch (trending down), but Grand Junction, Boulder, Platteville, and Shriever AFB are all 0.6-0.8 inches. This decrease in moisture will help to account for a decrease in thunderstorm numbers today, as well as a decrease in the heavy rain potential from any thunderstorm.

Compared to yesterday, thunderstorms will be fewer and favor the higher terrain. However, this does not rule out isolated thunderstorms east of the mountains, especially along and near the Palmer Divide, Raton Mesa, and Cheyenne Ridge. Thunderstorm activity will also be weaker than yesterday, responding to the decrease in moisture, a general lack of instability, and an area of weak upper-level subsidence overhead. Overall, the best chance for storm activity is expected over the San Juan Mountains, central and northern portions of the Continental Divide and Front Range, and along and near the Palmer Divide. High cloud bases, combined with relatively low maximum rain rates, will keep the flood threat at none for today. For more information, please check the region-specific discussions below.


High Country and Western Slope:

Isolated-to-scattered thunderstorms are expected, mainly over the mountain peaks, beginning around noon and diminishing quickly after sunset with the loss of daytime heating. Rain rates will be low, with maximum rates in the 0.2-0.3 inches/hour range. Overall, with less thunderstorm activity and cloud cover, high temperatures will be a few degrees warmer today.

Urban Corridor and East:

Isolated thunderstorms will begin to impact the region around 2 PM and diminish after sunset with the loss of sunshine and daytime heating. The best chance for thunderstorm activity will be along and near the Palmer Divide, with a couple of isolated thunderstorms across the eastern plains between 3 PM and 10 PM. Maximum rain rates will be relatively low, 0.25-0.5 inches/hour, thus the flood threat is “none” for today across the region. Aside from a few thunderstorms, skies will be mostly sunny and temperatures will be on the warm side, with highs in the mid-to-upper 80s near the mountains and the low-to-upper 90s further east across the plains.

Hover over your county to read your county-specific flood threat prediction.



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By accessing this website and/or data contained within the databases, you hereby release the State of Colorado, its employees, agents, contractors, and suppliers from any and all responsibility and liability associated with its use. In no event shall the State of Colorado or its officers or employees be liable for any damages arising in any way out of the use of the website, or use of the information contained in the website herein including, but not limited to the Flood Threat Portal.  

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