


Area Forecast Discussion
Issued by NWS Denver/Boulder, CO
Issued by NWS Denver/Boulder, CO
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667 FXUS65 KBOU 142052 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 239 PM MDT Mon Jul 14 2025 .KEY MESSAGES... - Warmer today with highs in the mid 90s across the plains. Scattered afternoon showers and thunderstorms, mainly over the higher elevations. - Afternoon showers/thunderstorms to continue most days this week, with an isolated threat for severe storms over the northeastern corner Tuesday. Best chance of rain across the plains comes Wednesday. - High temperatures to linger in the 90s across the plains through mid-week. && .DISCUSSION /Through Monday/... Issued at 202 PM MDT Mon Jul 14 2025 Mountain convection had an early start this morning, with storms initiating along the Continental Divide around 9AM. Temperatures are quickly climbing towards convective temperature across the plains, with multiple observation sites reporting 90+ degrees. As of 11:30 AM (Monday) ACARS soundings are showing just over 500 J/kg of MLCAPE, large dewpoint depressions, and DCAPE of over 1000 J/kg. This will be sufficient for thunderstorms to sustain themselves as they move onto the lower elevations, or for storms to develop once the convective temp is reached. These storms will be capable of bringing gusty outflows and dry microbursts between 30-40 mph, with a few as strong as 50-55 mph. With weak flow aloft, slow moving storms may bring some localized heavy rainfall (generally over the higher elevations), but with weak shear in place, storms are not expected to become severe, however, small hail will be possible. Cloud cover will help cool temperatures off this evening before clearing from west to east overnight. Flow aloft begins to increase on Tuesday as a shortwave moves across the northern Rockies. At the surface, a lee trough will stretch from across the plains of Colorado to South Dakota. Forecast soundings show MLCAPE values near 1000 J/kg with modest amounts of shear (30 to 40 kts) over the northern corner of Colorado in the afternoon/evening, where dewpoints will be in the 50s. This would support an isolated severe threat, with large hail and gusty winds being the main hazards. Elsewhere across the forecast area, scattered showers and weaker storms will be possible. A cold front/shortwave combo is expected to bring widespread precipitation and brief cooldown on Wednesday and Thursday. Some localized heavy rainfall will be possible as ensembles show PWAT values between 120-160% of normal from the Continental Divide eastward. A few stronger storms will be possible along and behind the front, especially along the northern plains where shear will be strongest, and the severe threat will be higher. Temperatures will feel cool compared to the rest of the week, but still climb into the mid to upper 80s across portions of the plains, with high 70s for areas along the Wyoming/Nebraska borders. By Friday, the ridge reamplifies and temperatures rebound to the 90s across the plains. Ensembles hold 90 degree temperatures steady for the foreseeable future. A more active pattern will continue through the forecast period with shortwaves passing through the upper-level flow, and scattered afternoon showers and storms will be possible each afternoon. && .AVIATION /18Z TAFS through 18Z Tuesday/... Issued at 1138 AM MDT Mon Jul 14 2025 Southeasterly winds will prevail the next few hours before thunderstorms move into the Denver area. Wind direction, then will likely be determined by outflow direction. Gusts to 25-35 knots will be likely, with a 20 percent chance for wind gusts to around 45 knots. Storms move off to the east early evening (01-02Z). Southeast to southerly winds to prevail overnight. Some enhanced drainage winds will be possible around 06Z with gusts to 25 knots. For Tuesday, northwest winds are expected to develop 16-18Z and then continue into the afternoon. The airmass will be drier with fewer showers and storms. Though there`s about 30 percent at a high based showers bringing gusty outflow winds during the afternoon. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...Bonner AVIATION...Meier