Lacy, South Dakota Weather Forecast Discussion

491
FXUS63 KABR 060738
AFDABR
Area Forecast Discussion
National Weather Service Aberdeen SD
238 AM CDT Mon Oct 6 2025
.KEY MESSAGES...
- Locally patchy frost is a possibility Tuesday morning mainly for
north central South Dakota.
&&
.SHORT TERM /TODAY THROUGH TUESDAY AFTERNOON/...
Issued at 238 AM CDT Mon Oct 6 2025
As of 2am scattered mid to high clouds are moving in from the
southwest over portions of central SD with current temperatures in
the upper 30s to the mid 40s. HREF indicates these clouds will
continue to push northeastward over the CWA through the morning
before clearing out this afternoon or so. Overall quiet and cooler
conditions expected for the short term as high pressure will be over
the region today and tonight. Extreme southern portions of Lyman
County could be clipped by some light sprinkles/rain (pop 15%), as a
few of the CAMs suggest this between ~10-13Z per a weak wave to the
south. By Tuesday morning, the center of the high is forecasted to
be over Nebraska as a front will pass over northeastern SD/western
MN from northwest to southeast, associated with a low over
northeastern Quebec tracking northeastward. Aloft, the region
continues in an overall troughing pattern with the trough shifting
eastward through Tuesday and a ridge setting up over the Pacific
Northwest. Towards the end of the short term, this ridge will shift
slightly east and winds (that have been southwesterly) will shift
west then northwest.
It will feel more like Fall today as 850mb temps by peak heating
will range from +4 to +6C, which runs between the 25-35th percentile
based on climatology for today. Forecasted highs will range between
the upper 50s to the lower 60s per deterministic NBM with the 25th-
75th spread for max temps ranging between 2-4 degrees in any one
location of the CWA. Even though winds will be out of the southwest
tonight, they will remain fairly light (5-10kts, highest eastern
slopes of Coteau, per marginal downsloping effect). With maybe only
a few clouds, this should allow for radiational cooling. NBM
deterministic temps are forecasted in the upper 30s to the lower 40s
with the 25-75th spread about 3-4 degrees. Patchy frost is possible
over north central SD. If we do dip below guidance (warmer bias from
above average temps past couple of weeks) or stronger radiational
cooling, NBM 10th percentile runs in the lower to upper 30s across
the CWA, coldest over north central SD. Right now, probability of
MinT

NWS ABR Office Area Forecast Discussion