


Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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872 FXUS63 KABR 281050 AFDABR Area Forecast Discussion National Weather Service Aberdeen SD 550 AM CDT Sat Jun 28 2025 .KEY MESSAGES... - Showers/storms (30-60% coverage) early this morning with a low risk of severe weather. - SLIGHT RISK (2 of 5) again for this afternoon, east of a line from Pierre to Aberdeen. Wind and hail are the primary threats, though can`t rule out a brief tornado in far eastern SD/western MN. - Another cluster of storms (40-60% coverage) coming up from the southwest early Sunday morning for central South Dakota before spreading east through the morning. Low risk of severe weather. && .UPDATE... Issued at 541 AM CDT Sat Jun 28 2025 Many updates this morning as we have developed widespread light showers and weak thunderstorms with the wave that is now situated overhead. The surface low/boundary is also located just to the northwest of Philip. This placement is a little farther west in comparison to earlier forecasts and may impact the forecast location for storms this afternoon. Thats something that may need redress once the 12Z CAMS become available. See below for the update to the aviation discussion. && .DISCUSSION... Issued at 154 AM CDT Sat Jun 28 2025 Cluster of storms in North Dakota threatens the northern CWA if any of the stronger storms decides to deviate to the right on a 320-340 degree trajectory. Otherwise we just have some weak convection smattered across the CWA mainly east river. All this is covered by current POPs. There is the question of whether this will get more organized overnight and lay down enough outflow to influence the final location for a surface trough ahead of a low across eastern South Dakota as a location for re-development later today. The responsible shortwave is taking its time moving east, so CAMS have highlighted this area for another round of potential severe weather. Additionally, another wave, back into Wyoming will make it into western South Dakota this evening. Strongest activity would be out towards the hills region, however as the wave continues east northeast elevated convection could be coming into the Missouri valley towards the morning hours Sunday. So, for this afternoon, profiles indicate decent mid-level flow of 40kts, though jet level winds are pretty weak with the 200mb jet over North Dakota. 1/2km winds are about 25kts down in the southeast CWA before they decouple as a low level jet forms southeast of the CWA. CAPE is once again up to between 3500-4000j/kg but with only 30kts 0-6 km shear. Thats enough shear for supercell characteristics, but with westerly mid-levels outflows will also impact storm mode. And the frontal boundary shifts storms out of the CWA before the low level jet influences storm mode. There is the shortwave out west that CAMS have latched onto. Better shear environment remains to the north, with steeper mid-level lapse rates up that way, while down into central South Dakota its a weaker shear/weaker MUCAPE environment. Will probably just end up with early morning pulse convection in central SD. An upper level trough sets overhead for Sunday, with weak high pressure. We get clipped by a backdoor front Monday with a brief cool down. A broad weak ridge builds in from the west for the middle of next week, with a series of weak ridge riders keeping POPs in the forecast mainly for the latter half of next week. No major thermal anomalies though 700mb temperatures are creeping up towards +14 by Thursday/Friday. && .AVIATION /12Z TAFS THROUGH 12Z SUNDAY/... Issued at 541 AM CDT Sat Jun 28 2025 Terminals KABR,KATY,KPIR,KMBG Mainly VFR conditions, though we have some IFR CIGS lingering around KATY. Clusters of VFR VISBY/CIG showers early this morning will also impact terminals. Later today, we have the greatest potential for afternoon strong thunderstorm activity at KATY and possibly KPIR/KABR. Additionally, late in the TAF period we could have a second cluster of storms come out from the west and impact KPIR and possibly KMBG. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ UPDATE...07 DISCUSSION...07 AVIATION...07