829 FXUS65 KBOU 082108 AFDBOUArea Forecast Discussion National Weather Service Denver/Boulder CO 308 PM MDT Mon Sep 8 2025
.KEY MESSAGES...
- Isolated, high based showers/storms through the rest of the evening. Very little to no rainfall, but gusty winds of 40-50 mph possible.
- Continued isolated to scattered showers and thunderstorms the next few days. Better chances for rainfall by mid to late week.
- Warm weather continues all week, with a slight cooldown this weekend?
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.DISCUSSION /Through Monday/... Issued at 235 PM MDT Mon Sep 8 2025
There`s a few showers out there this afternoon, but it`s generally been quiet across most of the CWA as an upper level ridge continues to slowly drift east. Temperatures have warmed into the mid to upper 80s across the forecast area, but there`s very little CAPE to work with dew points in the low to mid 30s.
Tomorrow should be relatively similar today as the ridge axis drifts east of the forecast area and weak southwesterly flow attempts to develop. There`s a little more moisture/instability to work with, but most high resolution guidance doesn`t produce much more than widely scattered showers/storms in the afternoon.
Southwesterly flow aloft will increase a bit as we get into the mid/late part of the week, as an upper trough stalls over the OR/ID/NV region and ridging builds across the southern Great Plains. Guidance has above normal moisture across the region (PWAT standardized anomalies ~1 sigma), and there should be scattered convection across the area each day. Each day would feature better precipitation chances across the higher elevations with lower chances along and east of I-25. There isn`t a particularly strong signal for widespread rainfall on any day, but the best moisture appears to be either Thursday or Friday. Temperatures during the period will be above normal with highs likely in the mid to upper 80s.
The trough should drift to the north and east over the northern Rockies by this weekend, leading to a slightly cooler/drier pattern across the area as we start to see more zonal flow. There is fairly good agreement in the overall pattern, but given the complex upper level pattern across the Northern Hemisphere/North America, it wouldn`t be surprising to see a fairly large shift as we get through the week.
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.AVIATION /18Z TAFS through 18Z Tuesday/... Issued at 1125 AM MDT Mon Sep 8 2025
Winds at the terminals have shifted to the W/WNW as better mixing has developed over the last hour or two. Expect winds to gradually veer more to the NW/NNW by mid afternoon, with some gusts up to around 20kt possible. There should be isolated or widely scattered high based convection today, with gusty outflow winds possible at all of the terminals after 21z. Drainage winds should prevail again tonight, with light and variable winds likely by tomorrow morning.
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.BOU WATCHES/WARNINGS/ADVISORIES... None.
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DISCUSSION...Hiris AVIATION...Hiris
NWS BOU Office Area Forecast Discussion