| Storms have already started to impact areas along the foothills just outside of the District where a few moderate showers have already produced rainfall rates between 0.30”-0.50” in 10-15 minutes. The best chance for storm activity today will begin over the next hour with a chance for storms lasting into the evening hours. Storm motions will generally be west to east between 10-20mph, with some erratic storm motions likely from outflow boundaries. This will result in some storms having the potential to anchor in place supporting clustering thunderstorms with a threat for 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 through midnight with skies gradually clearing overnight tonight. Overnight temperatures will drop into the low 60s for the plains with mid to upper 50s along the foothills. |
WORST CASE SCENARIO: A slow-moving thunderstorm, training of thunderstorms cells or a large thunderstorm complex may result in up to 1.25” of rain in 30-60 minutes.
| County-specific Quantitative Precipitation Outlook |
Precipitation Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Arapahoe |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Boulder |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Broomfield |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Denver |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Douglas |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Jefferson |
Current TO
1000 PM FRI |
0.05" (60%) to 0.3" (40%) to 0.8" (20%) | |
| Foothills above 6500ft | |||
| Boulder |
Current TO
1000 PM FRI |
0.05" (90%) to 0.3" (60%) to 0.8" (30%) | |
| Douglas |
Current TO
1000 PM FRI |
0.05" (90%) to 0.3" (60%) to 0.8" (30%) | |
| Jefferson |
Current TO
1000 PM FRI |
0.05" (90%) to 0.3" (60%) to 0.8" (30%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.