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241 FXUS65 KBOU 252319 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 519 PM MDT Sat Jul 25 2026 .KEY MESSAGES... - Record or near record heat this weekend - Heat Advisory for the I-25 Corridor today, expanding to all of the plains for Sunday as heat builds - Scattered afternoon/evening thunderstorms this weekend, mostnumerous over the higher terrain - Increasing chances for thunderstorms with locally heavy rain Monday, Tuesday, and Wednesday. && .DISCUSSION /Through Saturday/... Issued at 109 PM MDT Sat Jul 25 2026 It`s a hot day, with temperatures already in the 95-102F range. Scattered thunderstorms will continue to develop over the higher terrain and spread eastward. Precipitable water values are 0.90 to 1.25 (in) across the plains, so heavy rain is possible from the thunderstorms. Gusty outflow winds up to 50 mph are also possible near the storms. The upper level high will remain centered over the Central Rockies through Sunday. This will lead to a very warm night and hot temperatures again Sunday, possibly a couple degrees warmer. Some recorded highs today and Sunday will likely be tied or broken.The airmass dries a little Sunday, but enough moisture will be present for isolated to scattered thunderstorms. Coverage should be slightly less than today`s. Monday`s forecast will be more challenging and uncertain as a shortwave trough lifts northeast across Colorado while the center of the upper level high is nudged south. We`ll see an increase in moisture with precipitable water values climbing to around 1.25 to 1.5 (in) across the plains, which is well above normal (~99th percentile at 1.5 (in)). The increased moisture and shortwave are expected to bring cloud cover Monday morning and possibly showers. Temperatures will be cooler, but by how much depends how extensive the cloud cover ends up being. Instability may also be limited if clouds linger for most/all of the day. However, the shortwave may help trigger showers and storms, making the forecast a tricky one. The center of the high slowly shifts south and westward Tuesday and Wednesday, resulting in west to northwest flow aloft over Colorado. Monsoonal moisture will be plentiful, with readings continuing to be well above normal. This is expected to produce scattered to numerous showers and thunderstorms Tuesday and Wednesday. Temperatures will cool a little due to the increased moisture and the high`s center shifting southwest of the area. By Thursday, the high is expected to be near the Four Corners. This is expected to continue the slightly cooler temperature trend with highs in the upper 80s to mid 90s. The amount of moisture becomes less clear, though scattered showers and thunderstorms are still expected. Northwest flow aloft continues for Friday and Saturday. Model consensus favors less moisture, which should result in fewer showers and thunderstorms. && .AVIATION /00Z TAFS through 00Z Monday/... Issued at 515 PM MDT Sat Jul 25 2026 Still have some potential for sct high based -shra thru 04z with brief gusty winds from 30 to 35 mph so will keep in a prob30. Winds will remain S/SSW this evening and overnight. On Sun, winds will be light SW and then become north by 17z. Once again may see sct high based -shra with brief gusty winds from 35 to 40 mph by 21z. && .BOU WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 9 PM MDT this evening for COZ038>040-043. Heat Advisory from 10 AM to 9 PM MDT Sunday for COZ038>040- 042>051. && $$ DISCUSSION...12 AVIATION...RPK