| - | Yesterday evening's cold front has ushered cooler air and increased moisture into the District. Highs today will only reach the low 80s on the plains under scattered cloud cover. |
| - | Deep moisture is in place across the District today with dewpoints currently in the mid to upper 50's and PW values near 1". The atmosphere will likely remained capped for much of the day due to the cooler surface temperatures. Thunderstorms will initially develop over the foothills and Palmer Divide by early to mid afternoon, but development over the plains should hold off until late afternoon or early evening. |
| - | Storm coverage today will largely hinge on if/when the cap breaks, and where outflow boundaries set up. Storms today will generally move from west to east at 10-15mph, but could stall along outflow boundaries with training of cells also possible. Strong thunderstorms will be very capable of producing heavy rainfall given the moisture in place. Storms could also produce severe weather, including large hail, gusty straight-line winds, and frequent cloud to ground lightning. Storm activity will likely linger past sunset before tapering off by late in the evening. |
WORST CASE SCENARIO: A strong thunderstorm stalls along an outflow boundary or training of thunderstorm cells results in heavy rainfall of up to 3.2" in 90 minutes or less.
A LOOK AHEAD: Stubborn low level moisture will remain over the District Thursday before gradually decreasing late in the day. Therefore, scattered thunderstorms are expected with moderate to brief heavy rains possible. A shortwave disturbance will then move across Northern Colorado Friday, resulting in scattered afternoon thunderstorms once again with moderate to brief heavy rains possible. Drier westerly flow aloft arrives this weekend, resulting in generally dry conditions Saturday and Sunday along with the return of hot temperatures.
| Location | Prime Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Arapahoe |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Boulder |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Broomfield |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Denver |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Jefferson |
500 PM TO
1000 PM |
0.1" (80%) to 0.5" (50%) to 1.4" (15%) | |
| Douglas |
400 PM TO
1000 PM |
0.1" (80%) to 0.5" (60%) to 1.4" (25%) | |
| Foothills above 6500ft | |||
| Boulder |
300 PM TO
1000 PM |
0.1" (95%) to 0.5" (55%) to 1.4" (20%) | |
| Douglas |
300 PM TO
1000 PM |
0.1" (95%) to 0.5" (60%) to 1.4" (25%) | |
| Jefferson |
300 PM TO
1000 PM |
0.1" (95%) to 0.5" (60%) to 1.4" (25%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.