Area Forecast Discussion
Issued by NWS Aberdeen, SD
Issued by NWS Aberdeen, SD
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232 FXUS63 KABR 252351 AAA AFDABR Area Forecast Discussion...UPDATED National Weather Service Aberdeen SD 651 PM CDT Sat May 25 2024 .KEY MESSAGES... - Unsettled pattern continues with a 20-50% chance for showers and thunderstorms mainly south of a line from Wheaton, Minnesota to Murdo this evening. Some storms could be strong, especially across south central South Dakota. - 30-60% chance for rain Sunday afternoon through Monday. 20-50% chance for rain Wednesday night through Friday. && .UPDATE... Issued at 647 PM CDT Sat May 25 2024 Added in some fog tonight across the area given the recent showers and light winds. Bumped up south central to "areas of fog" for a few hours in the morning, as well. Based on latest radar trends, also added pops to Corson and Dewey counties for the next few hours. && .SHORT TERM /THIS EVENING THROUGH SUNDAY NIGHT/... Issued at 322 PM CDT Sat May 25 2024 A weak upper level shortwave trough will track across the CWA tonight, with a more zonal flow setting up on Sunday. Will then see a somewhat stronger trough approach Sunday evening and track over the CWA late Sunday night. At the surface, a boundary associated with a low pressure system west of the region has set up from southwest to northeast over the CWA, with southerly flow to the south of it and very light flow to the north. An abundance of cloud cover along it over the southern CWA has not allowed for much daytime heating, and therefore not much in the way of instability. However, 40 to 50 knot of shear will be in place late this afternoon into this evening, so cannot rule out the possibility of some shower and thunderstorm development, mainly south of a line from Wheaton, MN to Murdo. What instability there will be (1000-1500 J/kg) will be along and south of Interstate 90 corridor, so may see a stronger storm or two there. The precipitation will exit the area by early Sunday morning. Models are hinting at the possibility of some lower cloud cover and fog development late tonight into Sunday morning, but widespread dense fog is not expected. Will see precipitation chances return Sunday afternoon across central South Dakota, then spreading east Sunday night as another boundary tracks from west to east across the CWA. Instability and shear look minimal with this system, so not expecting any strong thunderstorm activity. Low temperatures tonight will be in the mid 40s to lower 50s. High temperatures on Sunday will be in the upper 60s to mid 70s. Lows Sunday night will be in the upper 40s to lower 50s. && .LONG TERM /MONDAY THROUGH SATURDAY/... Issued at 322 PM CDT Sat May 25 2024 We`ve got a shortwave trough making its way across the region Monday. Once this moves off to the east, a ridge will move in behind it and last through Thursday. Thursday evening a low starts to move into the region and will last through the end of the period. There will be a couple chances for rain through the period. The first is Monday morning (20-50%, higher in far northeastern SD and west central MN) as the trough moves across the area. The next will be Wednesday evening/Thursday (20-50%) ahead of the next trough. Storms are possible along with these rain chances with mid level lapse rates between 7 and 8 C/km and MLCAPE between 100 and 2000 J/kg. Confidence on severe potential is low at this time. Rain chances (20-40%) will continue through the end of the period. Temperatures for the first part of the long term will be rising to around average with highs in the upper 70s to around 80. Once the rain and trough moves in Thursday evening into Friday, temperatures will drop a couple degrees into the mid 70s. Winds west river could become rather strong Monday and again Wednesday with gusts of 30-35 mph possible. && .AVIATION /00Z TAFS THROUGH 00Z SUNDAY/... Issued at 647 PM CDT Sat May 25 2024 Terminals KABR,KATY,KPIR,KMBG VFR conditions will prevail this evening. Some MVFR/IFR cigs and and vsby in fog/stratus may develop into early Sunday morning especially along the Missouri River. More confidence that the fog will affect KPIR after the showers today, but could also develop around KMBG or KATY. Conditions are expected to be VFR for Sunday afternoon outside of any showers or thunderstorms. && .ABR WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. && $$ UPDATE...Wise SHORT TERM...Parkin LONG TERM...KK AVIATION...Wise