| - | A cold front is moving through the District this morning and will result winds turning to the E/NE with surface moisture on the increase. Temperatures will be cooler behind the front with highs in the 70's over the plains with 60's in the Front Range foothills. With increased moisture to work with today thunderstorms that develop this afternoon will be capable of producing heavy rainfall and may become severe with large hail and gusty winds being the primary threats. |
| - | Thunderstorm activity is expected to initiate between noon and 2pm. Prime time for thunderstorm coverage is from 2-10pm. 1-3 rounds of storms are expected through the evening with additional more isolated rain shower activity continuing possible overnight. Storm motions will be from W to E at around 20mph with stronger storms potentially moving more slowly. |
| - | Training of thunderstorm cells or a large, slower moving thunderstorm will produce the greatest risk for extended periods of heavy rainfall that may lead to excessive runoff and possibly flash flooding. Most storms will move fast enough to keep any heavy rainfall relatively brief. |
WORST CASE SCENARIO: Training of thunderstorm cells or a large/slower moving thunderstorm may result in up to 1.6" of rain in 45-60 minutes.
A LOOK AHEAD: Unseasonably cool Sunday with highs struggling to make it out of the 50's over the plains. A lull in the shower activity or minimal rain shower activity Sunday morning is expected to give way to a widespread rain at times through the day. Depending upon heating thunderstorms may develop in the afternoon but if temperatures remain too cool then precipitation likely favors a wetting rain. If thunderstorms develop, heavy rainfall is possible. Additional rain showers expected to continue periodically overnight into Monday morning. Higher elevations of the District above 8k may see some late season snowfall overnight Sunday into Monday.
| Location | Prime Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (20%) | |
| Arapahoe |
200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (20%) | |
| Broomfield |
200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) | |
| Denver |
200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (20%) | |
| Boulder |
100 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (20%) | |
| Douglas |
100 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) | |
| Jefferson |
100 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) | |
| Foothills above 6500ft | |||
| Boulder |
1200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) | |
| Douglas |
1200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) | |
| Jefferson |
1200 PM TO
1000 PM |
0.1" (80%) to 0.3" (50%) to 0.8" (15%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.