NWS-Green Bay Forecast Discussion

						FXUS63 KGRB 282315
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
615 PM CDT Tue Apr 28 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- A chance (30-50%) of showers Wednesday and Thursday, with
  rainfall totals generally under 0.25 inch through the weekend.

- Minor flooding persists on the Wolf River and on the Winnebago
  system. Light rainfall will allow flooding concerns to
  gradually subside as the week progresses.

- Below normal temperatures expected through the weekend.

&&

.DISCUSSION...
Issued at 142 PM CDT Tue Apr 28 2026

Persistent northwest flow aloft will bring a series of short-waves
through the western Great lakes region for the rest of the work
week. One will arrive late tonight/early Wednesday and bring a
small chance of light showers or sprinkles, with a stronger wave
generating scattered showers Wednesday afternoon and early
evening. Another short-wave is expected Thursday afternoon, along
with a good chance of showers. Although we are currently carrying
a dry forecast on Friday, we may eventually need to add a small
chance of showers, as yet another wave moves through in the
afternoon. Little or no instability is expected through this
period, so thunderstorms should not be concern.

Weak high pressure attempts to build into the region for the
weekend, so we may get a break in the daily shower activity then.
Shower chances increase during the early part of the next work
week as a fairly potent cold front moves through, though timing of
the front is in question at this point.

Given a persistent flow of Canadian air into the region, it is not
a surprise that temperatures will remain below normal for much of
the week. Some moderation in temperatures (to near normal) should
occur ahead of the front early next week, but this trend is
expected to be brief.

&&

.AVIATION...for 00Z TAF Issuance
Issued at 615 PM CDT Tue Apr 28 2026

SCT VFR clouds continue to steam over the region late this afternoon.
Cigs will gradually fill back in and lower this evenings as a short-
wave lifts towards southern WI, however, expect VFR conditions to
remain through tonight. There is a chance (30%) for scattered
showers to develop across east-central WI early Wednesday morning
which may cause brief periods of MFVR cigs/vsbys at ATW, GRB, and
MTW. Another short-wave will then bring a second round of showers to
much of the region during the afternoon as it swings south over MN.
Again periods of MVFR cigs/vsbys will be possible, but the
likelihood of any IFR conditions is low (less than 10%). These
showers should come to an end Wednesday evening with the loss of
daytime heating.

&&

.HYDROLOGY...
Issued at 142 PM CDT Tue Apr 28 2026

Minor flooding persists on the Wolf River at Shiocton and New
London, in addition to the Winnebago system. However, with less
rainfall than expected with the past two frontal systems and only
light rain anticipated for the rest of the week, flooding
concerns will gradually lessen into the weekend.

Those living near rivers or streams should continue to monitor
the latest Flood Warnings and statements from the National Weather
Service in Green Bay.

&&

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

&&

$$

DISCUSSION.....Kieckbusch
AVIATION.......GK
HYDROLOGY......Kieckbusch