Heron Lake, Minnesota Weather Forecast Discussion

176
FXUS63 KFSD 231114
AFDFSD
Area Forecast Discussion
National Weather Service Sioux Falls SD
614 AM CDT Tue Sep 23 2025
.KEY MESSAGES...
- Areas of patchy fog will be possible mainly across
  southwestern MN through mid-morning. With rapid changes in
  visibility possible over short distances, make sure to take
  additional time when making those morning commutes.
- A pattern shift by Wednesday will lead to much quieter
  conditions with temperatures near to just above normal our
  seasonal normals.
- Additional chances for patchy fog will be possible by
  Wednesday morning.
&&
.DISCUSSION...
Issued at 210 AM CDT Tue Sep 23 2025
TODAY & TONIGHT: Taking a look at satellite imagery, we`re
continuing to monitor what`s left of last night thunderstorm
activity which is now south of Highway-20 as of 1 am. While there
could be some spotty redevelopment in our southern most counties
over the next couple of hours, most of this activity should come to
an end by around 3 am to 4 am as the surface boundary continues to
progress to the south and east. Shifting gears to our fog potential,
could see some additional areas of patchy fog develop mainly across
southwestern MN and the SD/MN boarder this morning as lighter
surface winds set in. While this could lead to rapid changes in
visibility over short distances, should see gradual improvements
just after daybreak. From here, much quieter conditions should
return as temperatures peak in the low to upper 70s for the day.
Looking aloft, could see a spotty shower or two this evening as
pieces of lift rotate into the area on the backside of a positively
tilted trough. However, accumulations would be minimal (if any).
Otherwise, we`ll have to continue to monitor for fog tonight as
lingering low-level moisture and lighter surface winds make a
conducive environment for development mainly north of I-90.
WEDNESDAY ONWARDS: Looking into the midweek and beyond, quieter
conditions likely return by Wednesday as the previously mentioned
trough is replaced by a building ridge. Not only will this ridge
keep any precipitation chances at bay into the weekend, but also
reset our overall pattern. As a result, quasi-zonal flow will return
by Friday as temperatures continue to sit in the 70s to mid 80s well
into the new week. Otherwise, a cold front will pass through the
area between Friday night into Saturday morning. While this near
surface feature will be dry, the push of cold air advection (CAA)
could lead to a temporary decrease in temperatures by Saturday.
Lastly, with our next precipitation chances likely not occurring
until the beginning of October; this would be a great time to finish
any outdoor projects and/or plan family activities. With this in
mind, make sure to take advantage of the beautiful condition!
&&
.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/...
Issued at 605 AM CDT Tue Sep 23 2025
VFR condition are expected this TAF period. Taking a look at
satellite imagery, mid to upper level clouds continue to sit
over the area this morning with a few areas of patchy MVFR to
IFR fog mainly across southwestern MN. Expect the fog to persist
through mid-morning before gradually dissipating. Otherwise,
northerly to northeasterly surface winds will persist throughout
the day to end the TAF period.
&&
.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
IA...None.
NE...None.
&&
$$
DISCUSSION...05
AVIATION...05

NWS FSD Office Area Forecast Discussion