145
FXUS63 KABR 092039
AFDABR

Area Forecast Discussion
National Weather Service Aberdeen SD
239 PM CST Sun Nov 9 2025

.KEY MESSAGES...

- 10 to 15 degree below normal temperatures tonight.

- Above normal temperatures return for the Tuesday - Friday
timeframe.

&&

.DISCUSSION...
Issued at 236 PM CST Sun Nov 9 2025

Northerly flow aloft and a surface high pressure is producing chilly
temperatures across the forecast areas this afternoon with highs
mostly in the 20s and low 30s. An upper level vort over western
Minnesota is producing low clouds, and perhaps isolated flurries
northeast of the CWA. While the low clouds are invading the far
northeast CWA, some model guidance like the NBM and HREF keeps
most of the clouds over the far eastern CWA. Other models try to
bring the clouds, and isolated flurries further west, or near the
James River valley. Will run with the NBM output for now and make
adjustments later if needed. With a 1040 mb surface high pressure
sliding southward across the area tonight, winds will become light
and variable, along with a mostly clear sky west of I29. This
should allow low temperature to plummet into the single digits and
low teens. Wind chill values may range within a few degrees above
zero. WAA develops west of the CWA later tonight with some
locations seeing steady or slow rising temperatures toward
sunrise.

On Monday, the surface high pressure will exit the region, with
southerly flow spreading across the CWA. Meanwhile, a shortwave
passing well north and east of the region will bring much above
average airmass into the area, starting out west on Monday, and
pushing across the CWA on Tuesday. The warm air will continue
through the work week, with highs mostly in the 50s. As of now,
Friday appears to be our warmest day with highs in the mid 50s, to
the mid 60s. Depending on deterministic model used, 925 mb temps
reach +10C on Friday, which is above the 75th percentile. That said,
forecast south-southeastly winds are not typically our warm
producing winds.

Deterministic models show a storms system impacting the central US
Saturday through perhaps Monday, with some suggesting a decent
amount of pcpn for the Northern Plains. However, there is still a
significant ensemble spread, leading to a low forecaster confidence.
GEFS plumes at KABR show anywhere from 1.81 inches of liquid, to
zero. The mean is 0.2 inches. Basically, it could be a big storm
system, or just a passing wave with little pcpn. Stay tuned as the
forecast will likely change through the week.

&&

.AVIATION /18Z TAFS THROUGH 18Z MONDAY/...
Issued at 1124 AM CST Sun Nov 9 2025

Terminals KABR,KATY,KPIR,KMBG

Prevailing VFR conditions can be expected for all terminals
through the valid TAF period. However, low clouds may invade KATY
after 21Z this afternoon. May need to amend the TAF to account for
the low end MVFR cigs. Northerly winds today will subside
overnight. The winds will increase from the south on Monday.

&&

.ABR WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
&&

$$

DISCUSSION...SD
AVIATION...SD