NZUS93 KABR 261823
LLLABR
MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-270623-

Public Information Statement
National Weather Service Aberdeen SD
123 PM CDT Sat Apr 26 2025

Monday, the low pressure system continues to move over and through SD. A 
dry line looks to move through eastern SD during the early morning with a 
dry slot moving in behind it for a bit during the day. During the afternoon 
into the evening, a cold front will move through central and eastern SD. 
This looks to be when there is the highest potential for severe weathers 
over eastern SD, with CAPE values increasing during the day and the cap 
being decreased. While there had be a dry line earlier reducing moisture in 
central and eastern SD, the models are suggesting a TROWL/moisture wrapping 
around the low and back into eastern SD/western MN. The models do vary how 
far to the north the CAPE values of 500+ J/kg are, as well as how large of 
a cap over eastern SD and the speed of the low as it moves over central and 
eastern SD. Depending on the cap and speed of the low, there may be a lower 
risk for severe storms developing in eastern SD Monday. The higher chances 
for severe development look to at least be east of the James River Valley 
and mainly over western MN Monday afternoon. 

Behind the cold front, mid-level cold air starts to advect into central and 
eastern SD Monday. The winds behind this front will start to increase over 
central and eastern SD, with widespread non-convective gust over 30kts. 
Additionally, areas west of the Missouri River could potentially have gusts 
over 35kts Monday afternoon. These stronger winds will move through central 
and eastern SD, and by Tuesday morning, the winds will start to calm down 
as a surface high pressure moves over SD. Temperatures will also start to 
cool behind the cold front, with Tuesday and Wednesday’s temperatures 
looking to be around normal for this time of the year. Temperatures early 
Tuesday morning look to drop around if not slightly below freezing. 

The upper-levels create a cut-off low over the Four Corners region Tuesday 
that is then pushed to the east as another upper-level trough starts to move
towards and over SD Wednesday and Thursday. This trough’s passage looks to 
cause another cold front to move through the state, creating another chance 
for showers Wednesday into Thursday. There is still disagreement in the 
models as to the location and timing of this precipitation, which causes 
lower chances (20-40%) for rain. 

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