


Area Forecast Discussion
Issued by NWS Sioux Falls, SD
Issued by NWS Sioux Falls, SD
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879 FXUS63 KFSD 291755 AFDFSD Area Forecast Discussion National Weather Service Sioux Falls SD 1255 PM CDT Sun Jun 29 2025 .KEY MESSAGES... - Developing MCV may bring highly localized pockets of strong winds to the Highway 14 corridor this morning. - Isolated to scattered storms may redevelop later Sunday afternoon, mostly south of I-90. However confidence remains low on this potential, which may focus more over Nebraska/Iowa. Primary hazards would be quarter size hail and 60 mph winds. - Dry and only slightly cooler conditions return through midweek before our next low end risk for thunderstorms arrive Wednesday. - The 4th of July holiday forecast remains uncertain, but potential for thunderstorms remains increased (30 to 40%) for Friday into Saturday. && .DISCUSSION... Issued at 146 AM CDT Sun Jun 29 2025 THIS MORNING: Broad westerlies continue to push several lobes of vorticity through the area early this morning. Ongoing convection over southwest Minnesota trailing into south central South Dakota and northern Nebraska will continue to take an east southeast trajectory over the upcoming 2-4 hours. While a low end hail risk will persist, the greatest severe weather potential will likely come from downburst winds after brief upticks in reflectivity collapse as effective shear remains rather weak along and south of I-90. The greatest short term severe weather risk is likely in areas south of I-90 towards the MO river valley and into far western Iowa. We`re also keeping a closer eye on two other waves over western South Dakota that will try to move eastward through mid- morning Sunday. SUNDAY: Additional convection moves east over southern South Dakota through mid-morning Sunday, though the severe weather risk remains very uncertain. While we`ll still be dealing with upwards of 1500 J/KG MUCAPE, low-mid lvl winds remain rather weak, and mid-lvl lapse rates weakening, which should lower the threat eastward. Behind this wave, subsidence may take over though the middle of the day as the likely poorly defined surface front sinks southward into central Nebraska into north central Iowa. Convective temps may be reached by early to mid afternoon over portions of southern Minnesota, northwest Iowa, and northern Nebraska owing to the development of widely scattered strong to isolated severe storms mostly along and southeast of a line from Vermillion to Spencer. Elsewhere temperatures rise into the low to middle 80s. SUNDAY NIGHT: Models have congealed towards a solution that brings another weak shortwave through the Dakotas Sunday night into Monday. Instability should remain fairly weak, but forcing with the wave could lead to widely scattered showers and a few thunderstorms into Monday. MONDAY-TUESDAY: High pressure moves into the Northern Plains for Monday and Tuesday, producing high confidence in quiet conditions and temperatures in the lower to middle 80s Monday, towards the middle to upper 80s Tuesday. WEDNESDAY-SATURDAY: Isolated to scattered showers and thunderstorms may be possible early Wednesday morning on the nose of a seasonally weak LLJ. Severe storms not anticipated at this time but activity could linger well into the late morning hours Wednesday. The forecast remains dry heading into the 4th of July, but confidence is rising that temperatures will rise into the 90s in most locations by the 4th. Broad westerly to southwesterly flow will again favor increasing PoPs towards the 4th and 5th. Though shear remains weak, instability should be seasonally high leading to some increased potential for a few stronger storms for the holiday activities on the 4th and potentially through the 5th. && .AVIATION /18Z TAFS THROUGH 18Z MONDAY/... Issued at 1255 PM CDT Sun Jun 29 2025 A few mid and high level clouds sit across the area early this afternoon. At the surface, a boundary is pushing through the area, turning winds westerly in its wake. Wind speeds remain light at 5 to 10 knots. Isolated to perhaps scattered showers and thunderstorms will develop along and behind of the previously mentioned boundary. After the afternoon storms wane during the evening hours, a second round of showers will push in from the west and looks to persist into the overnight hours. Have added PROB30 groups to all TAFs to account for these chances for rain. Rain chances will come to an end from west to east tomorrow morning, leaving strengthening northwest winds to finish out the TAF period. && .FSD WATCHES/WARNINGS/ADVISORIES... SD...None. MN...None. IA...None. NE...None. && $$ DISCUSSION...Dux AVIATION...Meyers