209
FXUS63 KMPX 031934
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
234 PM CDT Thu Jul 3 2025

.KEY MESSAGES...

- A Heat Advisory remains in effect for western MN today, and
  for the Twin Cities metro Friday. Portions of western WI have
  also been included in a Heat Advisory on Friday.

- Showers and thunderstorms are expected late Friday into Saturday.

- Relief from the heat going into next week with no strong
  signal for anomalous temperatures.

&&

.DISCUSSION...
Issued at 231 PM CDT Thu Jul 3 2025

It is hot and steamy this afternoon as temperatures have climbed
into the upper 80s to lower 90s while dewpoints remain mostly above
65. The worst heat is currently in western MN where a Heat Advisory
(for heat indices over 100) remains in effect until 8 PM this
evening. Current visible satellite imagery reveals a band of
cumulus clouds beginning to fester from central MN southeast
into southern WI. These clouds seem to be developing along a
differential heating boundary and it is this boundary that could
be the focus for isolated thunderstorms over MN later this
afternoon. We aren`t expecting anything widespread, but a
cluster of storms may form by early this evening. Surface
mesoanalysis already has 2500-3000+ J/kg of SBCAPE across the
area. Any initial updrafts should be strong to potentially
severe with large hail being one of the primary threats.
Fortunately, vertical wind shear is less than 30 knots (not
sufficient for supercells) so storms will have trouble remaining
organized and likely grow into small clusters. This would
transition the threat to damaging winds instead. Isolated to
scattered showers and storms seem probable to fire over WI later
tonight with the arrival of a mid-level impulse. One or two
severe cells may occur with this activity also before upscale
clustering occurs. Rain should exit east of our WI counties soon
after sunrise Friday morning.

Lows will only drop into the upper 60s to mid 70s tonight, setting
the stage for another hot and steamy day Friday. With highs reaching
the low to mid 90s and dewpoints struggling to fall below 70, heat
indices will be above 95 for much of the area in the afternoon. A
Heat Advisory remains in effect for the Twin Cities metro from 12-8
PM Friday. We have also issued a Heat Advisory for Rusk, Chippewa,
and Eau Claire counties in WI Friday afternoon as WBGT values will
be at least 85 for 4 hours. With so many outdoor activities expected
for the holiday, be sure to have ways to stay cool as heat illness
can sneak up quickly. During Friday evening, showers and
thunderstorms that had formed ahead of a cold front over the eastern
Dakotas should arrive in western MN. As this activity travels east
Friday night, one or two clusters of storms may be capable of
producing severe wind gusts. The other concern is the timing of
precipitation as firework shows are scheduled across the area. As of
now, it looks like western MN will be the only ones in danger of
being "rained out" as rain for areas east (including the Twin
Cities) looks to hold off until after midnight. QPF amounts could
exceed 1" with any slower moving storms. Lows Friday night will be
stuffy again in the upper 60s to lower 70s.

Areas of showers and storms should be ongoing across eastern MN and
western WI Saturday morning. This activity will continue to slowly
travel east and likely exit our area by the afternoon. However,
guidance highly suggests redevelopment of convection over the same
region Saturday afternoon/evening. Another Marginal risk is in
effect for an increased possibility of severe wind gusts with any
stronger storms. A cold frontal passage will make Saturday`s highs
(and beyond) cooler with afternoon highs in the upper 70s to lower
80s. With the entire weather system traveling east any lingering
rain over WI should end by Sunday morning.

The weather for the first half of next week looks very uniform
temperature-wise. Highs will fluctuate within 5 degrees of the upper
70s to lower 80s while lows behave similarly in the upper 50s to
lower 60s. Chances for rain do exist towards mid-week with the best
chance (30-50%) occurring Tuesday as a shortwave dives from the
Canadian Prairies into the Great Lakes. Forecast model divergence
grows towards the end of next week as models differ in the evolution
of the upper-level pattern. Ridging over the western CONUS seems
highly likely but the amount of troughing that occurs in the eastern
CONUS would have an effect on how much more rain we could see over
the next couple of weeks.

&&

.AVIATION /18Z TAFS THROUGH 18Z FRIDAY/...
Issued at 1228 PM CDT Thu Jul 3 2025

VFR conditions are expected throughout the period. Hi-res models
have increased the chances for thunderstorms for
southern/eastern Minnesota and western Wisconsin this evening,
but they appear to be very scattered in nature. Have opted to do
PROB30s since there is high uncertainty on whether or not they
will become widespread enough to impact any of the terminals. By
late tomorrow morning, winds shift to the south/southwest with
gusts around 20kts.

KMSP...As mentioned above, threw in a PROB30 for thunderstorms
between 00-04z. Should be able to narrow down that time line by
the 21z AMD. Otherwise, winds go south/southwesterly tomorrow
afternoon with gusts around 20kts.

/OUTLOOK FOR KMSP/
SAT...-SHRA/MVFR, chc IFR/TSRA. Wind SW 5-10kts.
SUN...VFR, chc -TSRA/MVFR PM. Wind NW 10kts.
MON...VFR. Wind SE 5-10kts.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
MN...Heat Advisory until 8 PM CDT this evening for Lac Qui Parle-
     Yellow Medicine.
     Heat Advisory from noon to 8 PM CDT Friday for Anoka-Carver-
     Dakota-Hennepin-Ramsey-Scott-Washington.
WI...Heat Advisory from 1 PM to 5 PM CDT Friday for Chippewa-Eau
     Claire-Rusk.

&&

$$

DISCUSSION...CTG
AVIATION...Dye