Appleton, Wisconsin 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

999
FXUS63 KGRB 062051
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
351 PM CDT Fri Jun 6 2025

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Isolated showers late this afternoon into early this evening and
  again on Saturday.

- Widespread rain and thunderstorms are expected on Sunday and
  Monday. Severe potential remains low at this time.

&&

.DISCUSSION...
Issued at 351 PM CDT Fri Jun 6 2025

This afternoon`s radar imagery showed isolated showers across north-
central and far northeast WI, where clouds had cleared early this
morning. A few rumbles of thunder were observed earlier this
afternoon, which coincided with a couple hundred J/kg of SBCAPE.
Elsewhere, dry conditions prevailed under partly to mostly cloudy
skies. Anticipate the isolated showers to continue to pop up and
dissipate throughout the remainder of the afternoon and into early
this evening. SBCAPE has already decreased, so the likelihood of
additional rumbles of thunder is very low.

A few isolated showers or sprinkles are possible overnight as
lingering low to mid-level moisture sticks around, but a lack in
forcing may prevent any additional shower activity. Additional
isolated showers are possible on Saturday in central and north-
central WI, where some low-level WAA will reside during the
afternoon. Cannot rule out a few rumbles of thunder within any
shower with a couple hundred J/kg of CAPE around as well. The
remainder of the region should remain dry under mostly sunny skies.

A cold front is still on track to march across the forecast area on
Sunday, bringing widespread rain chances and thunderstorms. The
precipitation appears to be located only along the front, so the
rain/storm chances will be brief at any one location. The front is
progged to move across the forecast area from west to east between
mid-morning Sunday and late Sunday afternoon. Additional
precipitation may develop behind the front as well into the evening
before dissipating. The severe thunderstorm potential continues to
appear low due to the timing of the frontal passage and an
unfavorable location of the various severe parameters.

A mid-level closed low will dive south across the western Great
Lakes region Sunday night into Monday. This will provide another
opportunity for more showers and thunderstorms on Monday and
possibly into Tuesday.

&&

.AVIATION...for 18Z TAF Issuance
Issued at 1252 PM CDT Fri Jun 6 2025

Isolated showers with a few rumbles of thunder developed over
north-central WI early this afternoon where an area of clearing
occurred late this morning. Elsewhere, SCT to BKN VFR clouds
prevailed. Anticipate the isolated showers and few rumbles of
thunder to continue to pop-up across north-central and far
northeast WI through the heat of the day before dissipating around
sunset. Have only included a TEMPO group at RHI for thunder until
20z Fri, but may need to remove or extend this as conditions
evolve. The central WI TAF sites are likely to see isolated rain
showers through the afternoon, but the thunder potential is less
certain due to continued cloud cover. How far eastward the
isolated showers track is also less certain due to the prevailing
cloud cover over the east-central WI TAF sites. Decided to
continue using PROB30 groups at ATW and GRB for this reason.

There is still a possibility for an isolated shower overnight into
Saturday morning, but confidence is not high enough to include at
any TAF site due to said isolated nature.

Patchy fog is possible late tonight, mainly in north-central WI,
but this is looking less impactful than previously forecast.

&&

.GRB WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

DISCUSSION.....Kruk
AVIATION.......Kruk