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Area Forecast Discussion
Issued by NWS Denver/Boulder, CO
Issued by NWS Denver/Boulder, CO
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073 FXUS65 KBOU 020548 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 1148 PM MDT Mon Jul 1 2024 .KEY MESSAGES... - Isolated to scattered showers and thunderstorms through tonight. - Downward trend in showers and storms beyond Wednesday. && .UPDATE... Issued at 812 PM MDT Mon Jul 1 2024 Isolated to scattered showers and thunderstorms to continue this evening and through the night. Most of the storms will be this evening over the mountains and also along and east of the Palmer Divide. Adjusted PoPs a little to get slight chance in for most places through tonight. Also, went with showers versus thunderstorms across the plains after midnight. Rest of the forecast is on track. && .SHORT TERM /Through Tuesday/... Issued at 1246 PM MDT Mon Jul 1 2024 Satellite imagery shows cumulus developing across areas that got a break from the mid-level clouds across the high country and east plains and Lincoln County. These will be the more likely areas to develop scattered thunderstorms this afternoon. Instability has been low across the urban corridor and plains resulting in scattered showers/convective showers rather than thunderstorms. For the remainder of the afternoon and evening, expect scattered showers and some thunderstorms. Elevated moisture and marginal instability will warrant monitoring over the burn areas for any training showers/storms. The better environment for stronger storms was in the northeast corner, but may not be as favorable with showers having gone through today. Overnight, scattered, lower coverage showers are possible. A weak cold front moves through early Tuesday morning with potential for development of low stratus behind it. HREF guidance lacks agreement on how much moisture will stick around overnight resulting in lower confidence in the stratus chances. Tuesday, the upper level trough remains over the region. An upper level jet max positions to the north, increasing flow aloft over Colorado. A weak upper level shortwave trough moves through the flow. Moisture will be less than Monday, but will be sufficient to support a low chance (< 25%) isolated showers and thunderstorms in the afternoon. Marginal instability will also help keep chances and coverage low with MLCAPE values > 500 j/kg and will keep the "higher" chances confined to the southern Foothills, Palmer Divide, and far east plains. A weak frontal passage and cloud cover will keep temperatures cooler Tuesday with highs in the 80s on the plains. && .LONG TERM /Tuesday night through Monday/... Issued at 1246 PM MDT Mon Jul 1 2024 West to northwest flow aloft is expected for the middle part of the week. An upper level disturbance moves into the Wyoming Wednesday and then into the upper Midwest by Friday. With the upper level disturbance moving to our north Wednesday, southerly surface winds increase across the eastern plains. While low level moisture is limited for the western portion of the area, the plains will see enough moisture for scattered thunderstorms to develop. A few strong to severe thunderstorms are possible in the northeast corner of the state. For the higher elevations, with dry and breezy conditions, could have some areas with near critical fire weather conditions. Currently looks like Fire Weather zone 214 (Park County) may be the area of greatest concern. The cold front moves into the northeast plains late Wednesday night and pushes south across the plains Thursday morning. A breezy day is expected Thursday with cooler temperatures and drier air in place. Pops are very lows for the plains Thursday, meaning very low chances for any thunderstorms or precipitation. Thursday will also be the coolest day of the week with highs in the 70s and lower 80s. Fire Weather zone 214 again looks like it will flirt with critical fire weather conditions, but the dry and breezy weather across the CWA will mean that caution should be exercised with outdoor burning and fireworks. For Friday through Monday...the upper high remains over California with northwest flow aloft continuing across the CWA during this time. Generally dry conditions are expected through the weekend with an isolated shower or thunderstorm producing only gusty winds and very little rainfall. High temperatures on Friday will be slightly below normal, but warmer temperatures return Saturday through Monday with highs at the lower elevations in the low to mid 90s. && .AVIATION /06Z TAFS through 06Z Wednesday/... Issued at 1145 PM MDT Mon Jul 1 2024 Another batch of showers north of the terminals has shifted winds at DEN/BJC out of the northwest, and light north/northwesterly flow should continue overnight, aided by another weak frontal push later tonight. Additional showers are possible after 08z as radar shows an organized band of SHRA across the mountains. Ceilings are also expected to lower later tonight, with a slight chance of lower stratus developing around 12z. Tuesday should be fairly quiet, with moisture/cloud cover decreasing. Winds should generally be light out of the west/northwest, and will gradually turn more northeastward towards the evening hours. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ UPDATE...Meier SHORT TERM...Mensch LONG TERM...Stark AVIATION...Hiris