415
FXUS63 KGRB 291926
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
226 PM CDT Wed Apr 29 2026

Forecast discussion for routine afternoon forecast issuance

.KEY MESSAGES...

- Light rain ends from west to east during the late afternoon and
  evening. More showers expected on Thursday and possibly Friday.

- Frost Advisory for central WI late tonightinto early Thursday.
  Additional frost and freeze headlines expected over central and
  east central WI Thursday night and Friday night.

- Minor flooding persists on the Wolf River and Winnebago system.
  Water levels should gradually recede as the week progresses due
  to a lack of significant rainfall.

- Below normal temperatures expected through most of the period.

&&

.DISCUSSION...
Issued at 225 PM CDT Wed Apr 29 2026

Widespread light rain continues to develop across most of the
forecast area, in response to QG forcing ahead of a sharp
short-wave trough over western WI. The rain and clouds were
holding temperatures in the 40s. The rain will gradually taper
off from west to east during the rest of the afternoon and
evening, followed by partial clearing overnight. Partly cloudy
skies and light winds will allow temperatures to drop into the
middle 20s to middle 30s, which will allow frost to develop
in most areas late tonight.

Frost Headlines: Frost and Freeze headlines were started up along
and south of Hwy 29, plus Door County, today. Within that region,
temperatures dropping into the lower to middle 30s in central WI
late tonight should lead to widespread frost, so a Frost Advisory
has been issued for Marathon, Shawano, Wood, Portage, Waupaca and
Waushara counties from midnight through 8 am Thursday. Only patchy
frost is expected in the Fox Valley and lakeshore areas, so have
opted for no headlines there tonight. Potential for frost/freeze
headlines increases Thursday night and Friday night across all of
central WI, the Fox Valley and lakeshore areas.

Precipitation Chances: Persistent northwest flow aloft will bring
a series of short-waves through the western Great Lakes region
through the end of the work week. A short-wave is expected to
impact the forecast area during the late morning and afternoon on
Thursday, and pops have been increased a bit from previous
forecasts. In addition, a small chance of showers has been added
to eastern WI on Friday afternoon, as yet another wave passes
through. Given CAPE of 037-045.
&&

$$

DISCUSSION.....Kieckbusch
AVIATION.......Kieckbusch

NWS GRB Office Area Forecast Discussion