


Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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380 FXUS63 KABR 080525 AAB AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 1225 AM CDT Tue Jul 8 2025 .KEY MESSAGES... - Additional chances for thunderstorms and the potential for severe weather Wednesday evening and Thursday night into Friday. - Seasonal temperatures are expected during the 7 day forecast, with the exception of Wednesday and Thursday, when high temperatures could bump back up into the low to mid 90s throughout and west of the James River valley. && .UPDATE... Issued at 1223 AM CDT Tue Jul 8 2025 Updated Aviation Discussion Below. UPDATE Issued at 615 PM CDT Mon Jul 7 2025 Other than a few straggling showers, most of the activity has moved off to the south and east this evening. Made adjustments to pops and cleared the severe thunderstorm watch, accordingly. && .DISCUSSION... Issued at 345 PM CDT Mon Jul 7 2025 Scattered showers and thunderstorms continue to move through portions of the forecast area this afternoon. A few strong to severe storms will remain possible through the remainder of the afternoon into the early evening as all this activity shifts east and southeast. Large hail and damaging winds remain the main threats with the strongest cells. A tornado or two could still be possible, mainly east of the James Valley through late afternoon. All this active weather looks to exit our forecast area later this evening and by the early overnight period. With thicker morning cloud cover with the associated convection that was in place, it has kept a lid so to speak on convection really taking off so far this afternoon, especially across our eastern zones. Instability remains "muted", but still around 1000-1500 J/kg across our eastern and southern zones. Where sunshine has returned, across our western zones, MLCAPE values are a bit more higher closer to 2000 J/kg. In those zones, deep layer shear is a bit more favorable as well ranging from 35-45 kts. Vsbl satl shows agitated CU fields across Dewey County and parts of our south-central zones, along and south of US Hwy 14. Convection has fired out of that field in Dewey County. Our far southeast zones, around the Watertown and Ortonville areas and points south and east is also seeing some active convection. These will potentially be areas to monitor for further development going through the rest of the afternoon. There remains a north to south oriented sfc trough with a cold front draped from northeast to southwest across south central ND into the northwest corner of SD. So, with the given environment still in place across our CWA through the afternoon and early evening, would anticipate further development of convection as these sfc features slowly shift east and southeast through our area. CAM solutions more or less show convection hanging around through the remainder of the afternoon in our eastern zones and back to the west in the aforementioned areas of central SD, but they aren`t convinced that widespread robust convection will get going. So, we`ll just have to continue to monitor trends over the next few hours, but it would appear that the areas to watch more closely will be across our south central zones and our far southeast zones, south and east of the Watertown area. SPC continues to highlight our CWA with 3 different levels of severe weather outlooks, from a Marginal Risk (level 1 of 5) to a Slight Risk (level 2 of 5) to an Enhanced Risk (level 3 of 5) through the remainder of the day into tonight. The main threats will be large hail and damaging winds with some of these stronger cells that develop. The mid level trough, the upper level mechanism responsible for this current active weather today is progged to track east and away from our region overnight. The aforementioned sfc cold front will be slow to track southeast through our forecast area and not clearing our southern zones until after daybreak Tuesday. Sfc high pressure will begin to nose into our area leading to a more drier and stable day. Cooler temperatures are expected across our eastern zones with high temperatures behind held just below the 80 degree mark. Farther west, mid level heights start to increase in response to a strengthening mid level high located across the Desert Southwest part of the CONUS. Afternoon readings may top out close to 90 degrees across our west river zones. A bit of a short term heat bubble will remain in place Wednesday into Thursday with high temps in the low to mid 90s along and west of the James Valley. The active pattern looks to quickly return by the latter half of the work week. Southerly flow returns on Wednesday as humidity levels creep back up as a ridge riding shortwave rounds over the top of the ridge axis in place across the Northern High Plains. This should touch off another round of potentially severe convection Wednesday afternoon and evening. A more significant upper wave is progged to track through the Northern Plains on the latter half of Thursday into early Friday. This disturbance will have potential to produce severe convection Thursday afternoon and Thursday night. At this point, the upcoming weekend looks more quiet and dry. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 1223 AM CDT Tue Jul 8 2025 Terminals KABR,KATY,KPIR,KMBG VFR conditions and light winds will prevail at KPIR and KMBG for the next 24 hours. KABR will have lower visibilities from fog starting later tonight into the morning, and KATY is starting so show fog now. This will lead to IFR conditions for KABR and potentially LIFR conditions at KATY. Once the fog lifts, there will be VFR conditions though the remainder of the day with light winds. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ UPDATE...12 DISCUSSION...Vipond AVIATION...12