946
FXUS63 KGRB 021120
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
620 AM CDT Sat Aug 2 2025

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Smoke from Canadian wildfires will result in poor air quality
  and reduced visibilities at times through the weekend. An Air
  Quality Advisory is currently in effect until noon today. The
  Advisory may be extended later this morning.

- Patchy fog may restrict visibilities for motorists at times
  early this morning, and again late tonight and Sunday night.

- Dry weather, cool nights, warm days and low humidity are expected
  through the weekend. The chance of rain is not expected to
  return until the Wednesday and Thursday of next week (15-30%
  chance).

&&

.DISCUSSION...
Issued at 347 AM CDT Sat Aug 2 2025

Skies were mostly clear early this morning, along with areas of
fog and smoke. Visibilities at times were down to 1/4 of a mile
in dense fog in a few spots, while most areas with smoke or light
fog were between 3 and 6 miles. It was cool with temperatures
dropping into the upper 40s over the far north with 50s to lower
60s over the rest of the area. Ephraim was the warmest location
at 3 am at 62 degrees.

The main concern this weekend will be the smoke. An Air Quality
Advisory is currently in effect until noon today. With high
pressure remaining overhead into Monday, no real source of influx
of smoke free air into the region until Monday at the earliest.
The HRRR model output has the smoke continuing into Sunday.
Suspect that part or all of the Air Quality Advisory may need to
be extended later this morning. Will wait for an update from The
Wisconsin DNR for the latest information on any changes to the Air
Quality Advisory in location or timing.

Fair weather cumulus clouds will again develop again late this
morning and afternoon, and then again late Sunday morning and
Sunday afternoon. Fairly high based clouds between five and seven
thousand feet. Over the last two days, there has been a warm bias
in the guidance thus lowered max temperatures today and Sunday
by a degree or two. This warm bias in the guidance can be
attributed to the smoky skies. For tonight, did lower minimum
temperatures a few degrees especially in our typical cold spots
across the north.

Dry weather is expected to continue through Tuesday with the first
chance arriving late Wednesday afternoon but more likely Wednesday.
There is a continued chance of showers and storms Thursday and
Friday. Rain chances from Wednesday night through Friday are in
the 15-30% range. However, will need to watch Monday night into
Tuesday as waning convection is expected to move into western
Wisconsin. A few light showers could possibly make it into our
far western counties. At the moment, rain chances are less than
15% for this period.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 614 AM CDT Sat Aug 2 2025

Patchy fog, locally dense at times will rapidly dissipate around
12z this morning. The webcam at the Rhinelander Airport showed
the fog was very shallow. For the rest of today, areas of smoke
and some fair weather cumulus are expected. The height of the
clouds should be between five and seven thousand feet. Smoke
should lower visibilities into the 3-5 mile range at times.
The fog is expected to redevelop again tonight, gnerally between
07z-12z Sunday which should burn off quickly after sunrise. Fair
weather cumlus are expected again Sunday afternoon.

&&

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

&&

$$

DISCUSSION.....Eckberg
AVIATION.......Eckberg