Area Forecast Discussion
Issued by NWS Denver/Boulder, CO
Issued by NWS Denver/Boulder, CO
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580 FXUS65 KBOU 072035 AFDBOU Area Forecast Discussion National Weather Service Denver/Boulder CO 235 PM MDT Sun Jul 7 2024 .KEY MESSAGES... - Strong to severe thunderstorms are expected today across much of the plains, particularly east and southeast of Denver. - Drier starting Monday with a prolonged warming trend kicking off. - Starting Thursday through next weekend, prolong well above normal temperatures are likely. && .SHORT TERM /Through Monday/... Issued at 233 PM MDT Sun Jul 7 2024 Satellite imagery exemplifying today`s setup, with shallow strati-cu streaming westward and slowly but steadily advecting in better low-level moisture under an upslope flow regime. Meanwhile, thunderstorms have developed across northern Larimer and Weld Counties and is gradually pushing southeastward, with some secondary focal points for initiation beginning to show up across the foothills and north of Pikes Peak. Not much has changed with respect to the forecast over the past few hours. As convection continues marching into the plains, it will begin to encounter a more favorable environment for strengthening with moderate MLCAPE of 500-1,000 J/Kg and, more notably, impressive deep-layer shear which could exceed 50 kts per SPC`s latest mesoanalysis forecasts, roughly coinciding with the Slight Risk area. Still anticipate comparatively lesser coverage for locations roughly along and west of I-25, where instability will be a little more marginal and dewpoints may struggle to crack 50 degrees. The greater threat for severe weather will be concentrated along an axis from Morgan County southward into Elbert and Lincoln Counties. Since early this morning, guidance has come into quite good agreement when it comes to the progression of today`s convection. As far as timing is concerned, expect the main window for severe weather threats and large hail to be through mid evening, although it`s possible we could see some convection linger across the southernmost portion of our forecast area through late evening. Looking ahead into Monday, the trough will have moved due east of Colorado with subsident northwest flow filling in aloft. We`ll be quite a bit more stable and any afternoon showers or storms should be isolated, generally confined to our southern mountains and Park County where we`ll see light southerly winds near the surface and thus enhanced orographics. Otherwise, expect a much drier day, kicking off a prolonged warming trend. There`s high confidence in Monday being the coolest day of this upcoming week. Highs will be near normal, mostly in the low to mid 80`s in the plains, and 70`s for most mountain communities. && .LONG TERM /Monday night through Sunday/... Issued at 233 PM MDT Sun Jul 7 2024 Not many changes to the overall long term forecast period. As the shortwave trough exits, lingering mid level moisture could lead to weak diurnal convection for areas above eight thousand feet each afternoon Tuesday and Wednesday. Storms will likely remain sub- severe due to a lack of shear and instability. This should also keep the flood threat low for the burn areas. Starting Thursday, an upper level ridge finally arrives over Colorado. Cross sections indicate dry air throughout the 500-700mb layer. With the lack of moisture, only isolated chances (10-20%) of thunderstorms exists for Park, Summit, and Clear Creek counties. With strong ensemble agreement, widespread upper 90s to low 100s are likely starting Thursday through next weekend. NBM handles max temperatures well across the region. This heat may lead to tied/break max temperature records especially east of I-25. && .AVIATION /18Z TAFS through 18Z Monday/... Issued at 1127 AM MDT Sun Jul 7 2024 Stratus has largely dissipated across Denver area terminals with the bulk of lower CIGS mostly limited to areas southeast of the metro region. VFR conditions are expected to prevail for all terminals from here on out. Confidence is increasing in the development of thunderstorms mid afternoon, with greatest coverage and intensity from KDEN eastward. A few of the stronger storms could produce brief vis reductions to 3-6SM under the heavier cores, but this would be isolated and the chance of this occurring at KDEN is quite low (~15%). Bases are expected to range between 060 and 070, bud hedging closer to the higher end of the range for this afternoon. ENE winds over the next few hours should gradually become more NNE near mid afternoon, with speeds generally 12-16 kts. However, occasional gusts of 25-35 kts will be possible late afternoon in the vicinity of any TS. Expect activity to diminish after 01Z Mon with a quick reduction in wind speeds through the evening. Drainage flow will generally prevail overnight, but should be fairly light. No convection is anticipated on Monday. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && $$ SHORT TERM...Rodriguez LONG TERM...AD AVIATION...Rodriguez