


Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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317 FXUS63 KABR 151122 AAA AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 622 AM CDT Tue Jul 15 2025 .KEY MESSAGES... - A slight risk (level 2 out of 5) for severe thunderstorms will be possible this afternoon and evening south of a line from Wheaton, MN to Vivian, SD. A marginal risk (level 1 out of 5) for severe weather is in place elsewhere. The primary threats will be damaging winds, large hail, and heavy rain. - Heavy rain is possible along and east of the James River into west central Minnesota Tuesday into early Wednesday. - There will be a noticeable cool-down midweek with highs potentially 15 to 20 degrees below normal Wednesday and 10 to 15 degrees below normal Thursday. && .DISCUSSION... Issued at 427 AM CDT Tue Jul 15 2025 Showers continue to linger in and to the north of the low that stretches from south central SD northeast toward the Sisseton Hills early this morning. Hi-res CAMs keep this activity going through morning and then begin to increase the coverage this afternoon. General thinking is that CAPE will be high enough south of the cold front (2000 to 3000 J/kg) to support severe storms. There is a slight risk (level 2 of 5) south of a line from Wheaton to Vivian this afternoon and evening mainly for strong, gusty winds and quarter sized hail. There`s still some discrepancies on the exact placement and timing of the front. Frontal forcing will be enhanced by 7.5 to 8.5 degree/km lapse rates and shortwave activity again. Additionally, the increased threat for localized heavy rain remains for the James Valley east, especially around the Coteau and Sisseton Hills. Storms may train or move very slowly in the axis of the low. Much cooler temperatures are expected today behind the cold front with temperatures falling in the afternoon into the 60s across the northern tier. South of the front, highs in the 80s are forecast. Rain continues through tonight with a brief lull on Wednesday morning before another wave moves in from the west in the upper trough. Highs on Wednesday will range 15 to 20 degrees below average, topping out in the low to mid 60s. The diurnal range between overnight lows and Wednesday`s highs may need a slight adjustment given the expected cloud cover. Surface high pressure builds in Wednesday night with drier conditions. Southerly flow returns Thursday ahead of a lee side low in Wyoming. This sets up the potential for further chances of showers and thunderstorms Thursday night and then Friday into Saturday as the low moves into SD and NE. The pattern remains active through Tuesday. && .AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/... Issued at 620 AM CDT Tue Jul 15 2025 Terminals KABR,KATY,KPIR,KMBG VFR conditions will deteriorate to MVFR/IFR this afternoon and evening as lower cigs move in behind a cold front. Showers and thunderstorms will increase in coverage this afternoon, especially along and south of the front. Visibility may fall to IFR/MVFR in heavier showers. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ DISCUSSION...20 AVIATION...20