564
FXUS63 KGRB 152330
AFDGRB

Area Forecast Discussion
National Weather Service Green Bay WI
630 PM CDT Mon Jun 15 2026

Updated aviation portion for 00Z TAF issuance

.KEY MESSAGES...

- 30-50% chance for non-severe storms across northern Wisconsin
  late this afternoon and evening, but brief gusty winds are
  possible.

- 60-90% chance of showers and storms Tuesday afternoon with a
  80-100% chance Wednesday afternoon and evening. Chances for
  organized severe weather remain low, but a few strong storms
  with small hail, gusty winds and heavy rainfall may occur.

- Moderate to heavy rain Wednesday afternoon and night with a
  60-80% chance of exceeding 1 inch of rain.

- Below average temperatures in the 60s and 70s through the week.

&&

.DISCUSSION...
Issued at 1209 PM CDT Mon Jun 15 2026

This afternoon-Tonight:

Isolated to scattered storms (30-50% chance) may develop across
northern Wisconsin within a modestly unstable and seasonably dry
environment this afternoon/evening. Overall, the environment is not
supportive of organized severe weather, but steepening low-level
lapse rates with diurnal heating within a dry boundary layer may
support gusty outflow winds with any storms before stabilization
occurs during the evening.

Tuesday-Wednesday:

Two prominent shortwave troughs will impact the area through mid-
week. The first will move through on Tuesday. Again, boundary layer
heating beneath seasonably cold (

NWS GRB Office Area Forecast Discussion