917 FXUS65 KBOU 032015 AFDBOUArea Forecast Discussion National Weather Service Denver/Boulder CO 215 PM MDT Fri Oct 3 2025
.KEY MESSAGES...
- Becoming windy most areas Saturday with elevated fire weather conditions.
- Showers and a few storms graze the high country tonight, but become more numerous Saturday. A dusting of new snow likely (70%) for the mountains into Saturday evening.
- A few strong to severe storms over the northeastern plains Saturday pm, with the main threat damaging winds.
- Cooler Sunday through early next week...but warmer temperatures likely to return by mid/late week.
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.DISCUSSION /Through Friday/... Issued at 215 PM MDT Fri Oct 3 2025
Southwest flow will strengthen through Saturday as an upper level low moves east across the Great Basin, and then ejects northeast into Western Wyoming Saturday afternoon. 700 mb winds increase to 35 kts, so the windier areas (mountains, Palmer Divide, and eastern plains) should see peak gusts of 35-40 mph as the airmass will become well mixed by afternoon. Farther north (roughly from Boulder - Fort Collins), winds will be slower to establish themselves and in fact quite likely may not through most of the day given some blocking and even potential for a backdoor cold front. Regarding shower and storm chances, the increasing QG forcing will aid development through the day, with the highest coverage in the mountains spreading to the northern border area where moisture is not as limited. Farther south and southeast across the plains, it will be drier but still a low chance of a high based shower/storm. However, given the strength of the environmental flow and DCAPE near 1000-1100 J/kg, any high based shower/storm will be capable of producing severe wind gusts to 60 mph. SPC has a Marginal Risk for now and that looks good, although I wouldn`t be surprised to see that expanded a bit considering synoptic scale lift to aid coverage.
Temperatures turn cooler behind passage of the cold front late Saturday afternoon and evening, with winds turning more west/northwest. The colder temperatures should allow for a dusting of snow (
NWS BOU Office Area Forecast Discussion