Grant, Minnesota Weather Forecast Discussion

357
FXUS63 KMPX 241933
AFDMPX
Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
233 PM CDT Wed Sep 24 2025
.KEY MESSAGES...
- Patchy fog likely late tonight through Thursday morning.
  Isolated pockets of dense fog are possible.
- Mild temperatures and dry conditions to persist through at least
  the first half of next week.
&&
.DISCUSSION...
Issued at 233 PM CDT Wed Sep 24 2025
Visible satellite reveals mostly sunny skies across much of the
region. The greatest impact to sky cover can be found across far SE
MN/portions of W WI, where lingering strato-cu (following morning
dense fog) has been slow to clear. In addition, scattered Cu has
developed across western MN, where morning fog was also present.
Afternoon highs are on track to reach the mid to upper 70s
across much of south central MN. Temperatures are running
slightly cooler across western WI due to the persistence of
cloud cover this morning. Skies will clear heading into this
evening and with light and variable winds overnight. The
influence of lake fog should be less pronounced tonight, though
will likely see patchy fog develop across eastern MN/western WI
and it`s possible that visibility may dip below 1 mile in spots.
Fog is forecast to mix out by 14/15z and we`ll be left with a
gorgeous Thursday characterized by sunny skies and highs in the
low 80s. Little change in the airmass by Friday, so expect
similar conditions with high temperatures running ~10+ degrees
above normal. Of note, we did give the high temperatures a
little bit of a boost by blending in NBM90th percentile highs
given the persistence of a pattern that has produced overachievement
above the operational NBM over the past few days.
A shortwave is forecast to slide across southern Canada Friday into
Saturday, sending a cold front through our portion of the Upper
Midwest. Model consensus keeps the best forcing for rain chances
to the north of the International Border. Chances for precipitation
with this wave were already very slim and now are essentially
zero, as no members of the Grand Ensemble (GEFS/EPS/GEPS)
produce precipitation across our forecast area. With that in
mind, the main story heading into the weekend will continue to
be the anomalous late September warmth. The shortwave is progged
to lift north towards Hudson Bay Saturday into Sunday. Large
scale ridging will build northward in response, which opens the
door for an 8-10C 850mb temperature anomaly to build Sunday into
Monday. Latest forecast features highs in the low to mid 80s
both days, though as I mentioned yesterday this type of setup
supports potential overachievement by a few degrees. Should that
be the case, we could be looking at widespread highs in the mid
80s, which is more than 15 degrees above normal for late
September.
For next week, the upper-air pattern is forecast to take on a
meridional look that features longwave troughing in the west and
ridging over the eastern CONUS. This places our portion of the
country in a zone of persistent southwesterly flow which aims to
keep the mild air flowing northward to open October. Conceptually,
there should be some low-level jet activity setting up across the
central CONUS for the middle to end of next week which may yield the
return of precipitation chances. That being said, this scenario is
typically not handled well by the global guidance so the continuation
of a zero PoP forecast through at least the middle of next week
is appropriate. By late next week/the weekend of 10/4-10/5,
long term guidance shows the return of a more active upper-
level pattern that may bring better rain chances to the region.
For now, the theme is more dry and mild Fall weather.
&&
.AVIATION /18Z TAFS THROUGH 18Z THURSDAY/...
Issued at 1235 PM CDT Wed Sep 24 2025
Lingering strato-cu tied to morning dense fog continues to
gradually dissipate across SE MN/W WI. Should see remaining
terminals with MVFR cigs improve to VFR early this afternoon.
Latest satellite trends depict the development of diurnal VFR
Cu (~4k feet) across western MN. Clear skies/light and variable
winds overnight set the stage for another round of patchy dense
fog. Does not appear that fog will be as widespread as the
previous few mornings, though the signal is present in the LAMP
guidance for sub-1SM visibility at RNH/EAU. Opted to include
TEMPOs from 9-13z at both WI terminals. Confidence is lower in
impacts from fog farther to the west, but felt it was wise to
follow hi-res trends and include a period of MVFR visibility at
STC/MKT. Any morning fog that develops will mix out by 14/15z.
Winds increase out of the west between 5-10kts heading into
Thursday afternoon.
KMSP...Latest RAP guidance advertises the potential for MVFR
visibility around ~12z, however this appears to be an outlier
across the data set. Since fog has struggled to impact the
terminal the past few mornings, have opted to keep lower
visibility mention out of the TAF at this time.
/OUTLOOK FOR KMSP/
FRI...VFR. Wind S 5-10 kts.
SAT...VFR. Wind NW 5-10 kts.
SUN...VFR. Wind S 5-10 kts.
&&
.MPX WATCHES/WARNINGS/ADVISORIES...
MN...None.
WI...None.
&&
$$
DISCUSSION...Strus
AVIATION...Strus

NWS MPX Office Area Forecast Discussion