Time: 837 AM Wed May 26, 2021 Forecaster: Brad Simmons

Heavy Precipitation Outlook
Flash Flood Prediction Program

GENERALLY DRY WITH ISOLATED HIGH-BASED AFTERNOON THUNDERSTORMS/CHERRY CREEK FLUSHING OPERATION TODAY
-An upper level disturbance will move through the District today but with little moisture to work with along and W of the I-25 corridor any storm development will be high-based with minimal rainfall. Stronger thunderstorms are expected to remain well E of the District this afternoon.
-Highs will reach the 70's to around 80 over the plains under a veil of partly to mostly cloudy skies. The chance for high-based showers and weak thunderstorms will be between the hours of 3-7pm. Gusty winds and sprinkles are the most likely outcome from storms today with most areas remaining on the drier side. Far E areas of the District will have slightly better chances measurable precipitation.
-The US Army Corps of Engineers will be performing the annual Cherry Creek Dam sediment flush today and will result in a rise along Cherry Creek through Denver which may inundate bike paths at times. A Message 1 Cherry Creek Trail Flood Advisory will be issued for the exercise and will be valid from 9am to 7pm today.
STORM RAINFALL POTENTIAL AND DURATION: Typical high based showers and weak thunderstorms will produce a trace to 0.1" of rain. A stronger thunderstorm far eastern areas of the District will have the potential to produce 0.1-0.3" in 10-30 minutes.

WORST CASE SCENARIO: Moisture levels remain elevated and strong to severe storms are able to develop further W than expected and result in 0.3-0.8" of rain in 10-30 minutes.

A LOOK AHEAD: A cold front will move through tonight with highs on Thursday in the low to mid 70's over the plains. There will be a little better chance for isolated afternoon thunderstorms, mainly over the foothills and Palmer Divide.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 300 PM TO 700 PM
Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE
Arapahoe 300 PM TO 700 PM
Trace (40%) to 0.1" (20%) to 0.3" (10%) NONE
Boulder 300 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Broomfield 300 PM TO 700 PM
Trace (20%) to 0.1" (10%) to 0.2" (5%) NONE
Denver 300 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.3" (5%) NONE
Douglas 300 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Jefferson 300 PM TO 700 PM
Trace (30%) to 0.1" (15%) to 0.2" (5%) NONE
Foothills above 6500ft      
Boulder 200 PM TO 700 PM
Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE
Douglas 200 PM TO 700 PM
Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE
Jefferson 200 PM TO 700 PM
Trace (40%) to 0.1" (20%) to 0.2" (10%) NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/