949
FXUS63 KABR 280515
AFDABR

Area Forecast Discussion
National Weather Service Aberdeen SD
1215 AM CDT Tue Jul 28 2026

.KEY MESSAGES...

- Western wildfire smoke may impact visibility at times across the
  region through Tuesday evening.

- Less intense heat but temperatures still 5 to 15 degrees above
  normal through at least mid-week.

&&

.UPDATE...
Issued at 1215 AM CDT Tue Jul 28 2026

UPDATE for AVIATION discussion.

UPDATE Issued at 630 PM CDT Mon Jul 27 2026


Showers and thunderstorms continue to move east across central
SD this evening. Other than gusty winds west river, most of this
activity has been disorganized and sub-severe. Cannot rule out
an isolated gust to 60 mph as any of these showers collapse, but
not expecting widespread severe wind gusts at this time.

&&

.DISCUSSION...
Issued at 202 PM CDT Mon Jul 27 2026

Have some smoke aloft over the region as shown by CIRA Geocolor
imagery. Not much impact at the surface though, as much of the
region is P6SM visibility. Latest run of HRRR-smoke continues to
show moderate concentrations of smoke aloft and at the surface
through Tuesday evening, so continued mention of it in the
grids/forecast.

Temperatures this afternoon are warming through the upper 80s to
upper 90s. Latest look at heat indices shows everyone under 100
degrees, which was expected. Although, there will likely be a few
areas at 100 or even a couple ticks above by later this afternoon.
Areal coverage won`t be widespread enough to warrant any headlines.
Still a couple more days of the widespread 90s Tuesday and
Wednesday, before a slight cooldown to where more 80s show up for
highs by the last half of the week.

Main concern for later this afternoon into early evening is the
increasing coverage of showers/storms expected across western SD and
eventually into central SD. Radars upstream show activity moving out
of northeast WY/southeast MT and into far western SD. CAMs continue
to show development over the next few hours, especially the HRRR.
Opted to blend in some ECAM feel to PoPs this evening/tonight to
increase things just a little above that of NBM - better matching
HRRR trends. DCAPE values look to be around 1500 J/KG once again, so
strong wind gusts/outflows is the primary threat, with gusts perhaps
up to 70-75 mph.

Latest run of PoPs in the extended period shows precipitation
chances as high as 60-80 percent for Thursday/Thursday night.
GEFS/ENS/GEPS mean MSLP and mean 10m wind speeds/direction all show
a rather well defined surface boundary/trough moving across the CWA
during that time. ENS/GEPS mean dewpoints Thursday out ahead of the
frontal boundary show readings up around 70 degrees with PWATS on
the order of 1.80in to 1.90in. So, it would be safe to say we likely
develop some instability out ahead of the surface trough. ML severe
potential output showing some lower end probabilities for Thursday
into Thursday night. 75th percentile 24-hr precipitation off the
Grand Ensemble showing as much as 0.75in rainfall or higher.

&&

.AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 1215 AM CDT Tue Jul 28 2026

Terminals KABR,KATY,KPIR,KMBG

Expect mainly VFR conditions through the period. 6SM visibility
with smoke will be possible at PIR over a majority of the next
24 hours, through much of the daytime hours at MBG, with less
concentrated smoke at both ABR and ATY.

&&

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

&&

$$

UPDATE...06
DISCUSSION...TMT
AVIATION...06