| - | Message 1's have been issued for the entire District and will be valid until 9:30pm this evening. |
| - | An outflow boundary from thunderstorms over Larimer and Weld Counties is moving southward and will enter the District in Boulder County shortly. This outflow boundary will likely act as a triggering mechanism for thunderstorms as it continues to progress southward. Stronger storms that develop on this boundary will have the potential to produce heavy rainfall that may lead to excessive runoff and possibly flash flooding. |
| - | Slower moving thunderstorms or briefly anchored thunderstorms will pose the greatest risk for extended periods of heavy rainfall. More typical storms will move from SW to NE at 15-20mph. Best chances for thunderstorms will be until 8 or 9pm. |
WORST CASE SCENARIO: An anchored strong thunderstorm or a slower moving large thunderstorm may result in up to 2.0" of rain in 60-90 minutes.
| County-specific Quantitative Precipitation Outlook |
Precipitation Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
400 PM TO
900 PM |
0.1" (75%) to 0.5" (40%) to 1.0" (20%) | |
| Arapahoe |
400 PM TO
900 PM |
0.1" (75%) to 0.5" (40%) to 1.0" (20%) | |
| Boulder |
400 PM TO
900 PM |
0.1" (90%) to 0.5" (50%) to 1.0" (25%) | |
| Broomfield |
400 PM TO
900 PM |
0.1" (80%) to 0.5" (45%) to 1.0" (20%) | |
| Denver |
400 PM TO
900 PM |
0.1" (75%) to 0.5" (40%) to 1.0" (20%) | |
| Douglas |
400 PM TO
900 PM |
0.1" (80%) to 0.5" (45%) to 1.0" (20%) | |
| Jefferson |
400 PM TO
900 PM |
0.1" (90%) to 0.5" (50%) to 1.0" (25%) | |
| Foothills above 6500ft | |||
| Boulder |
400 PM TO
900 PM |
0.1" (90%) to 0.5" (50%) to 1.0" (25%) | |
| Douglas |
400 PM TO
900 PM |
0.1" (90%) to 0.5" (50%) to 1.0" (25%) | |
| Jefferson |
400 PM TO
900 PM |
0.1" (80%) to 0.5" (45%) to 1.0" (20%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.