Area Forecast Discussion
Issued by NWS Pueblo, CO
Issued by NWS Pueblo, CO
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010 FXUS65 KPUB 011818 AFDPUB Area Forecast Discussion National Weather Service Pueblo CO 1218 PM MDT Wed May 1 2024 .KEY MESSAGES... - Critical fire weather conditions for the San Luis Valley and portions of the southeastern plains today. - Isolated thunderstorms possible this afternoon and early evening over the central mountains, the Palmer Divide and the far eastern plains. One or two strong thunderstorms possible across Kiowa, Bent and Prowers counties. - Critical fire weather conditions possible for the San Luis Valley Thursday and Friday. - Isolated to scattered showers and thunderstorms possible through the rest of the work week into the weekend. && .SHORT TERM /THROUGH THURSDAY/... Issued at 336 AM MDT Wed May 1 2024 Currently...Cold front last evening has produced easterly winds across the eastern plains, while winds aloft remain brisk and out of the west to southwest in response to an upper low pressure system moving across the northern Rockies. Temps as of 3 AM have cooled into the 30s to lower 40s for the high valleys, and 40s for the plains. Today and tonight... A lot going on today as an upper trough slowly crosses MT and WY over the next 24 hours. Increasing west-southwest flow aloft will advect warmer and dry air into much of the forecast area today, though the central mts and northward will likely see some enhanced cloud cover and isolated convection by the afternoon. The central mts may see 1 to 3 inches of new snow through tonight, mainly across the higher peaks of Lake County. Convection/thunderstorm potential: As the upper trough gradually moves east, the best dynamics will remain over the northern half of CO, clipping the central mts starting by midday, then sweeping east across Teller County and the Palmer Divide by mid-afternoon. Plenty of solar heating today will help a surface low to deepen over southeastern CO, and the question will be where exactly the dryline sets up. Some models indicate it quickly pushes into KS, while others have it linger for a few hrs in eastern CO before pushing east. Given the expected brisk southerly surface winds across the far eastern plains, coupled with an approaching cold front early evening, feel that there will be a window of opportunity out ahead of the front for a strong storm or two to tap into higher dewpoints across Kiowa, Bent and Prowers counties this afternoon between 3 PM and 9 PM. There will be plenty of shear, 0-6km bulk shear of 55-65 kts, and CAPE sitting at around 1000 j/kg. The actual time window will likely be smaller, depending on the arrival of the cold front which is timed in the forecast to push south across the Palmer Divide right around 8 PM. The main threats from storms that do develop will be gusts up to 55 mph and hail to the size of nickels. Critical fire weather potential: Further south, feel that with the low humidity levels and expected gusty winds developing during the afternoon, the current Red Flag Warning in place for the San Luis Valley and portions of the southeast plains looks good. The only questionable area will be Baca County, where the dryline will be flitting across and could negate the dryness criteria. Activity dies off quickly for much of the area by midnight, with much of the action pushing east into the central US plains, and just isolated showers lingering over the central mts. Plan on high temps today in the mid 60s to mid 70s for the high valleys, and upper 60s to around 80F for the plains. Overnight lows tonight will cool into the 30s for the high valleys, and 40s for the plains. Moore && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Issued at 336 AM MDT Wed May 1 2024 Moderate to strong west to southwest flow aloft continues across the region Thursday and Friday, with one embedded shortwave translating east into the Northern High Plains early Thursday morning, as another embedded wave remains progged to translate across the Northern Rockies through the day Friday, which continues out across the Northern High Plains late Friday night. A cold front associated with the 1st passing wave backs across the southeast Plains early Thursday morning, with the potential for some patchy early morning stratus across the lower eastern slopes. Latest models indicate drier mixing across the region through the day Thursday, though with steep mid level lapse rates and easterly low level upslope flow, will see isolated to scattered high based showers and a few possible storms across the higher terrain, with best coverage across the Pikes Peak region. Further west, breezy westerly flow aloft and afternoon mixing develops critical fire weather conditions across the San Luis Valley, where a Fire Weather Watch has been issued for Tuesday afternoon into the early evening. Latest model data indicates increasing southwest flow aloft across the Rockies ahead of the next embedded wave Thursday night, with developing mid level waa supporting chances of showers across the southeast Plains through the overnight hours. Developing lee troughing across the Plains allows for breezy southerly winds across the plains through the day Friday, with increasing low level moisture east of the trough support chances of afternoon showers and storms across the Plains Friday afternoon, while uvv associated with the passing wave supporting scattered showers and storms spreading across the higher terrain Friday afternoon and out across the Plains Friday night, as the passing systems cold front pushes across the plains into early Saturday morning. Breezy west to southwest winds across the San Luis Valley through the day Friday, will again support critical fire weather conditions for the Valley and possibly into portions of the I-25 Friday afternoon and early evening. Shortwave ridging builds across the Rockies on Saturday, with enough moisture combined with low level upslope behind this front will help to develop a few showers and storms across the eastern mtns and immediate adjacent plains Saturday afternoon. Latest model data coming into slightly better agreement for Sunday and into early next week, as a strong upper low translates across Great Basin Sunday and then lifts out across the Northern Rockies Monday. Strong southwest flow across the region Sunday could develop a dryline across the Plains Sunday afternoon, with chances of showers and storms across the far southeast Plains Sunday afternoon and evening. Dry, warm and breezy westerly flow then looks to prevail across the Rockies Monday into the middle of the work week, with fire weather concerns continuing across the region. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 1210 PM MDT Wed May 1 2024 VFR at all taf sites the next 24 hrs. At KALS, sw winds gusting over 30 kts will continue into the evening, then slowly diminish after 02z-04z this evening. On Thu, sw winds will increase again in the afternoon, and some gusts to around 25 kts are likely. At KCOS, gusty south winds will continue this afternoon, then switch to the north 00z-02z as a cold front drops south through through the terminal. Low risk of a vcsh from 03z-09z behind the front, along with lowering VFR cigs into the early Thu morning. At KPUB, s-se winds will slowly strengthen this afternoon, briefly shift to the sw around 00z, then become gusty northerly after 03z behind a cold front. && .PUB WATCHES/WARNINGS/ADVISORIES... Red Flag Warning until 9 PM MDT this evening for COZ224-232- 233-237. Fire Weather Watch from Thursday afternoon through Thursday evening for COZ224. && $$ SHORT TERM...MOORE LONG TERM...GARBEROGLIO/MW AVIATION...PETERSEN