| The National Weather Service in Boulder has issued a Flood Watch for the entire District effective from 3:00 PM Today, June 11th, 2023, until 3:00 AM Monday, June 12th, 2023. The MHFD Message 2 will start prior to the NWS Flood Watch due to the potential for storms with heavy rainfall to enter the District before to 3pm. These storms have already initiated along the higher terrain foothills and will slowly progress eastward and onto the I-25 corridor this afternoon. Very week steering flow aloft, good upper-level support and an abundance of moisture in place has resulted in a good chance for widespread thunderstorms with heavy rainfall leading to localized flooding. The best chance for storms to enter the western portions of the District will be between 1-2pm with storms likely throughout the District between 2-4pm. Multiple rounds of storms will be likely today, leading to a Flood Watch through the evening and into the overnight. A chance some of these storms become severe, with large hail up to 1.5”, gusty winds 60+ mph throughout the District. The best chance for severe weather will likely be during the initial round of storms, with additional storms likely decreasing in intensity, however, with elevated moisture and good dynamics, even moderate rain showers will produce heavy rainfall well into the late evening hours. |
WORST CASE SCENARIO: Anchored or slow-moving thunderstorms have the potential to produce up to 2.50” total in 45-60 minutes.
| County-specific Quantitative Precipitation Outlook |
Precipitation Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
100 PM TO
300 AM MON |
0.4" (90%) to 0.75" (60%) to 1.5" (30%) | |
| Arapahoe |
100 PM TO
300 AM MON |
0.4" (90%) to 0.75" (60%) to 1.5" (30%) | |
| Boulder |
100 PM TO
300 AM MON |
0.4" (90%) to 0.75" (60%) to 1.5" (30%) | |
| Broomfield |
100 PM TO
300 AM MON |
0.4" (90%) to 0.75" (60%) to 1.5" (30%) | |
| Denver |
100 PM TO
300 AM MON |
0.4" (90%) to 0.75" (60%) to 1.5" (30%) | |
| Douglas |
100 PM TO
300 AM MON |
0.4" (95%) to 0.75" (70%) to 1.5" (40%) | |
| Jefferson |
100 PM TO
300 AM MON |
0.4" (95%) to 0.75" (70%) to 1.5" (40%) | |
| Foothills above 6500ft | |||
| Boulder |
100 PM TO
300 AM MON |
0.4" (100%) to 0.75" (75%) to 1.5" (50%) | |
| Douglas |
100 PM TO
300 AM MON |
0.4" (100%) to 0.75" (75%) to 1.5" (50%) | |
| Jefferson |
100 PM TO
300 AM MON |
0.4" (100%) to 0.75" (75%) to 1.5" (50%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.