| - | A general break in the pattern is expected across the plains today, but a trough of low pressure is approaching from the west and will begin to impact portions of the District this evening. Temperatures will remain cooler than average with highs in the upper 50s to low 60s on the plains. |
| - | Isolated thunderstorms will develop over the foothills by early to mid afternoon but a more stable airmass over the plains will limit thunderstorm activity until late in the afternoon. The heavy rainfall threat should remain limited through late afternoon with dry air in place at the lower levels. |
| - | By late afternoon/early evening, upper level lift ahead of the approaching trough along with increasing low level upslope flow will lead to increasing showers and thunderstorms across northern and western portions of the District, while coverage remains more isolated farther south. Most showers/storms will produce light to moderate rains with storm motions to the N/NE at 20-30mph, but if a stronger storm manages to develop then brief heavy rainfall would be possible. The best chance of this happening would be during the early evening hours. Scattered light rain showers will continue possible well into the overnight period, favoring northern areas. |
WORST CASE SCENARIO: Training of thunderstorm cells results in rainfall of up to 1.0" in 60 minutes or less.
A LOOK AHEAD: A powerful low pressure system will impact the District on Monday with isolated rain showers in the morning giving way to more numerous showers and thunderstorms during the afternoon. Moderate to heavy rainfall will be possible with thunderstorms during the afternoon hours. Monday night, a more widespread rainfall will develop but the threat for heavy rains will diminish as the atmosphere stabilizes. Colder air will filter into the District Monday through Monday night with even some accumulating snowfall expected in the foothills above 7,000'.
| Location | Prime Time | 30-Minute Rainfall and % Probability |
Message Potential |
|---|---|---|---|
| Plains | |||
| Adams |
400 PM TO
400 AM MON |
Trace (90%) to 0.2" (50%) to 0.5" (20%) | |
| Arapahoe |
400 PM TO
200 AM MON |
Trace (80%) to 0.2" (40%) to 0.5" (10%) | |
| Broomfield |
400 PM TO
400 AM MON |
Trace (90%) to 0.2" (50%) to 0.5" (20%) | |
| Denver |
400 PM TO
300 AM MON |
Trace (85%) to 0.2" (45%) to 0.5" (15%) | |
| Boulder |
300 PM TO
500 AM MON |
Trace (95%) to 0.2" (60%) to 0.5" (25%) | |
| Douglas |
300 PM TO
200 AM MON |
Trace (75%) to 0.2" (40%) to 0.5" (10%) | |
| Jefferson |
300 PM TO
400 AM MON |
Trace (90%) to 0.2" (50%) to 0.5" (20%) | |
| Foothills above 6500ft | |||
| Jefferson |
400 PM TO
400 AM MON |
Trace (95%) to 0.2" (50%) to 0.5" (20%) | |
| Boulder |
200 PM TO
500 AM MON |
Trace (95%) to 0.2" (50%) to 0.5" (25%) | |
| Douglas |
200 PM TO
200 AM MON |
Trace (80%) to 0.2" (40%) to 0.5" (10%) |
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.