938
FXUS63 KGRB 191103
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
603 AM CDT Mon Oct 19 2026

Updated aviation portion for 12Z TAF issuance

.KEY MESSAGES...

- Dry and warm conditions this week. Next smaller chances for rain
  (15-25%) not until this weekend.

- Late night, early morning fog possible this week.

&&

.DISCUSSION...
Issued at 1145 PM CDT Sun Oct 18 2026

Mostly Dry This Week...The region will be under the influence of a
ridge of high pressure through at least Friday, keeping conditions
dry under mostly sunny skies. The previously mentioned small chances
for precip on Wednesday associated from a cold front to the north
have decreased to a less than 10% chance of rain (ensembles and NBM)
due to the dominant dry air from the prevailing high pressure. If
anything, the forecast area would see an increase in clouds on
Wednesday. Otherwise, guidance is indicating the next chance for
rain for sometime this weekend as a mid-level trough and surface low
eject northeast from the Middle Rockies. However, timing and
placement is not certain with the evolution of this system. At this
point, probabilities for 0.10 inches of rain have increased slightly
to up to 25% by Sunday evening.

Fog Potential...The prevailing high pressure combined with nighttime
cooling and light winds will result in the potential for at least
patchy ground fog each night/morning from Monday night through at
least Wednesday night. A couple of these nights could have locally
dense fog.

Temperatures...This weather pattern will keep temperatures above
normal through the week and into the weekend with highs mainly in
the 60s each day. A few spots could see highs in the low 70s
starting on Wednesday. Overnight lows will also be above normal with
values mainly in the 40s. Monday night will be the coldest night
with the surface high centered overhead, causing locations across
the north to see values in the 30s.

&&

.AVIATION...for 12Z TAF Issuance
Issued at 548 AM CDT Mon Oct 19 2026

VFR conditions should prevail through Tuesday afternoon. The only
exception will be for some patchy fog late tonight (08z-14z
Tuesday). For today, a weak frontal boundary will cause winds
to veer to the northwest and then easterly later this morning
into the afternoon.

&&

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

&&

$$

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

NWS GRB Office Area Forecast Discussion