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Area Forecast Discussion
Issued by NWS Pueblo, CO
Issued by NWS Pueblo, CO
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177 FXUS65 KPUB 181731 AFDPUB Area Forecast Discussion National Weather Service Pueblo CO 1131 AM MDT Thu Jul 18 2024 .KEY MESSAGES... - Scattered afternoon and evening showers and thunderstorms, some strong to severe, especially along and east of the I-25 corridor. - Below normal temperatures and continued chances for daily showers and thunderstorms dominate the extended forecast. && .SHORT TERM /THROUGH TONIGHT/... Issued at 413 AM MDT Thu Jul 18 2024 Shower and thunderstorm development still ongoing across the southeast plains early this morning, as mid level energy continues to move through the region. These storms have been steadily dropping south during the overnight hours, and expect that to continue over the next couple of hours as this development follows the instability axis south. At this point, would expect brief heavy downpours and small hail with any stronger storm, before these storms exit. A moist air mass is in place early this morning, and this can be seen with the expansive low stratus which has developed just lee of the southeast mountains. South to southeast low to mid level flow has been in place most of the night and supporting this development, and while I think these clouds will remain during the early morning hours, should see a scattering trend as 700mb flow continues to veer more westerly. Overall a clearing trend over much of southern Colorado this morning, with slightly warmer temps expected today owing to some rising heights aloft. Another day of shower and thunderstorm development is expected over much of southern Colorado today, as well as the risk of scattered strong to severe storms along and east of the I-25 corridor. While some ridging will be noted today, the region will still be on the fringe of this ridge. This should allow additional short wave energy to drop south today. Will once again see low level flow strengthening out of the east today, along with 700mb flow turning back to the east southeast. This large scale support, moist upslope flow, and lee troughing will support shower and thunderstorm development over and near the higher terrain by early afternoon. By mid to late afternoon, should see this development spread east across the I-25 corridor and then continue into the eastern plains through the evening hours. Moist and unstable conditions are already in place early this morning, with surface dew points in the upper 50s to around 60 degrees up to the I-25 corridor and dew points in the upper 40s to around 50 degrees in parts of the mountains and mountain valleys. While day time mixing should help to bring down this moisture, mainly over/near the higher terrain, the strengthening easterlies will help to offset this. This will help support MLCAPE values of 500 to 1000 j/kg over and just lee of the southeast mountains, with instability once again increasing to the east across the plains. Think values will easily approach 2000 j/kg across the plains this afternoon and evening. Also, setup today will once again support modest bulk shear values. Given all of this, think scattered strong to severe storms capable of producing hail up to the size of ping pongs, wind gusts up to 65 mph, and heavy downpours. Will also need to keep an eye on area burn scars later this afternoon and evening, as a few stronger storms could move across these areas. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... Issued at 413 AM MDT Thu Jul 18 2024 Friday.. Northwesterly to northerly flow aloft remains in place over Colorado for Friday, as the upper high sits just slightly west of the Four Corners region. Shortwave energy embedded in the larger scale flow coupled with monsoonal moisture working its way around the high will work together to spark another round of scattered to numerous showers and thunderstorms over our area, especially over the high country. High res models are starting to hint at modest amounts of instability Friday afternoon out on our eastern plains, somewhere in the 800 to 1200 J/Kg range, though forecast shear amounts still seem very uncertain. For the most part, it seems that the most favorable shear for stronger storms will be the near the mountains, and the highest instability will be further east out on our plains. Overall, forecast soundings for Friday show higher DCAPE values than SBCAPE in many locations, leading to higher chances for gusty outflows on our plains. The SPC has added portions of Crowley, Otero, Bent, Prowers, and Kiowa counties to a marginal risk for severe weather for Friday, with the main risks being damaging winds gusting to 60 mph, hail, and excessive rainfall. The WPC has also outlined our entire forecast are for excessive rainfall. Flash flooding will be possible for area burn scars, the Chalk Cliffs, and any areas that see heavy rains for multiple days in a row on Friday, especially in the high country. Temperatures on Friday will be around 1 to 2 degrees below normal for most locations, with highs in the upper 80s to mid 90s for the plains, mid 80s for mountain valleys, and 60s and 70s for higher terrain locations. Saturday Onwards.. Models continue to bring a cold front through the forecast area sometime late Friday or early Saturday, which will cool us down further, and help to keep our daily chances for showers and thunderstorms alive. Over the weekend, the upper high is forecast to elongate and push off further to our west. This will lead to even more cool, due northerly flow aloft for our region. Enough recycled monsoonal moisture and shortwave energy looks to come through nearly every day to keep daily chances for showers and thunderstorms going, with main risks being excessive rainfall, especially over the high country. Our temperatures look to stay 5 to 10 degrees below normal from this weekend through at least Tuesday. The coolest days of the period looks to be Sunday and Monday, when highs could top out in the 70s across portions of our plains! && .AVIATION /18Z TAFS THROUGH 18Z FRIDAY/... Issued at 1124 AM MDT Thu Jul 18 2024 Another round of thunderstorms will develop over the mountains and spread into the adjacent lower elevations this afternoon through early evening. Winds will be dominated by southeast to easterly winds for KCOS and KPUB before -TSRA will contribute to erratic wind directions and gusts up to around 40 kts after 21z as thunderstorms move off the mountains. Probability of thunderstorms directly impacting the terminals is under 50% right now so will maintain VCTS in both KCOS and KPUB tafs but outflow winds are more likely affect both terminals so have included a tempo group for this probability. KALS will also see VCTS and -SHRA this afternoon with erratic gusty outflow winds up to 40 kts possible. Thunderstorms should move east of the terminals by 01-02z with clearing skies overnight. Another round of thunderstorms will be possible Friday afternoon. -KT && .PUB WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...RODRIGUEZ LONG TERM...EHR AVIATION...KT