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167 FXUS65 KBOU 282321 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 521 PM MDT Sat Mar 28 2026 .KEY MESSAGES... - Well above normal temperatures Sunday and Monday afternoons. - Critical fire weather conditions becoming widespread Monday. - Cooler by Tuesday with snow in the mountains and a chance of precipitation over the plains. - More upper troughing for next weekend. && .DISCUSSION /Through Saturday/... Issued at 1224 PM MDT Sat Mar 28 2026 Flat upper ridging will dominate the weather across the forecast area both today and Sunday with much above normal temperatures. Weak upper troughing moves across Monday night bringing a cooler airmass in for Tuesday and Wednesday along with some precipitation. Currently, surface observations are showing temperatures in the mid 60s to mid 70s across the plains, which is 30 degrees warmer compared to yesterday at this time. Southwest winds are in place at 10-25 mph for most areas. Models have fairly weak zonal flow aloft for the CWA now through Monday. Moisture will be relegated to the mid and upper levels. The QG Omega fields are showing very weak to neutral synoptic scale energy for that period. Cross sections and forecast soundings point to limited late day high based convection both this afternoon and Sunday afternoon, mainly producing virga and outflow wind gusts as high as 40 mph. With winds progged to increase somewhat on Monday, fire weather conditions will likely get to critical levels for most of the plains by afternoon. This area may eventually require a Red Flag Watch. The weak upper trough will bring in a decent cold front, upslope low level flow and increased moisture late Monday night continuing into Tuesday. The mountains may see a few inches of snow, especially Tuesday afternoon and evening. Temperatures may get close to record high values later this afternoon as well as Sunday and even Monday too. Highs are expected to be in the lower 80s over the plains all three afternoons. Tuesday`s highs cool down significantly with highs mainly in the lower 50s over the plains. For the later period, Wednesday through Saturday, a weak upper trough moves across Wednesday, followed by weak ridging. By Friday and Saturday, a fairly strong upper trough will affect Colorado, with the medium range models not the best in agreement concerning timing. However, it does look like a cooler and, hopefully, wetter period may prevail. && .AVIATION /00Z TAFS through 00Z Monday/... Issued at 516 PM MDT Sat Mar 28 2026 Sporadic virga has been around this aftn with brief gusty outflow winds. This activity should end by 01z. Naturally winds have had differing directions due to outflow boundaries but should see winds become more E/ESE by 01z and then gradually turn more SSW between 03z and 04z. On Sun, winds will become more WNW between 16z and 17z and then NW by 21z. Virga chances Sun aftn look to be lower (10% chance). Otherwise VFR conditions thru the period. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ DISCUSSION...66 AVIATION...RPK