| Storms have started to impact areas along the higher terrain foothills where a few moderate showers have already produced rainfall rates between 0.30”-0.80” in 20-30 minutes. Cooler temperatures this morning have helped limit storm development, however as we move into the afternoon the threat of moderate to heavy rainfall will be possible across the entire District. The best chance for storm activity today will begin in the next hour with a chance for storms into the evening hours. Storm motions will generally be NW to SE with some erratic storm motions likely from outflow boundaries into the evening. Some storms will have the potential to anchor in place supporting clustering thunderstorms with a threat for longer lasting moderate to heavy rainfall. A quick 0.50”-0.80” in 10-20 minutes is expected, along with the possibility for over 1.0” of rain per hour if a stronger storm stalls over the District. Storms today may also contain hail up to 1.0”, gusty winds up to 50mph and frequent cloud-to-ground lightning. A slight chance of showers lingers through midnight, although the threat of heavy rainfall will likely subside by 10pm this evening. A few off and on showers may persist overnight with skies gradually clearing by daybreak tomorrow. Overnight temperatures will drop into the low 60s for the plains with mid to upper 50s along the foothills. |
WORST CASE SCENARIO: A strong/stationary thunderstorm or a training of heavy showers may produce 2.00" in 30 minutes or less, resulting in excessive runoff and possible flash flooding.
| County-specific Quantitative Precipitation Outlook |
Precipitation Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Arapahoe |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Boulder |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Broomfield |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Denver |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Douglas |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Jefferson |
Current TO
1000 PM SUN |
0.3" (75%) to 0.6" (50%) to 1.2" (25%) | |
| Foothills above 6500ft | |||
| Boulder |
Current TO
1000 PM SUN |
0.3" (80%) to 0.6" (60%) to 1.2" (40%) | |
| Douglas |
Current TO
1000 PM SUN |
0.3" (80%) to 0.6" (60%) to 1.2" (40%) | |
| Jefferson |
Current TO
1000 PM SUN |
0.3" (80%) to 0.6" (60%) to 1.2" (40%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.