Time: 832 AM Sat August 12, 2023 Forecaster: Laura Smith

Heavy Precipitation Outlook
Flash Flood Prediction Program

ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS
West-southwesterly flow aloft has developed broadly across Colorado as an upper-level disturbance traverses the Northern Plains. This morning will be partly cloudy followed by high temperatures in the mid to upper 80 with dew points in the upper 40s. Isolated to Scattered showers and thunderstorms have already developed across the mountains and will move east onto the Plains by late morning. Storm activity is expected to move east by the early evening.
STORM RAINFALL POTENTIAL AND DURATION: Typical showers will be weak, producing rainfall of TR-0.25” total in 10-30 minutes. Stronger storms have the potential to produce heavy rainfall of 0.25” to 0.50” total in 10-30 minutes.

WORST CASE SCENARIO: Training thunderstorms have the potential to produce 0.50” to 1.00” in 60 minutes.

A LOOK AHEAD: Tomorrow, an upper-level disturbance and its associated cold front will bring a chance for scattered showers and storms across the Front Range Urban Corridor. Afternoon temperatures will reach the upper 70s to low 80s. Looking ahead, Monday morning will be mostly sunny followed by highs in the upper 70s to low 80s and a slight chance for isolated afternoon showers. A drying pattern will begin on Tuesday as upper-level ridging expands into the Intermountain West.

Location Prime Time 30-Minute Rainfall
and % Probability
Message
Potential
Plains      
Adams 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Arapahoe 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Boulder 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Broomfield 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Denver 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Douglas 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Jefferson 1200 PM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Foothills above 6500ft      
Boulder 1100 AM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Douglas 1100 AM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
Jefferson 1100 AM TO 600 PM
Trace (80%) to 0.25" (50%) to 0.5" (20%) LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
https://f2p2.udfcd.org/generator/