677 FXUS63 KGRR 211805 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 205 PM EDT Wed Oct 21 2026 .KEY MESSAGES... - Dry with Morning Fog - Chances for Rain Return Next Week && .DISCUSSION... Issued at 205 PM EDT Wed Oct 21 2026 - Dry with Morning Fog Our period of dry weather will continue through the weekend. A shortwave trough and associated front will swing through this evening. This is currently located in the UP into northern Wisconsin. There is limited moisture with this disturbance, therefore only expecting some cloud cover to move in. Skies clear overnight with a moderate inversion developing and temperatures falling into the upper 30s to low 40s. HREF and REFS show a 40 to 60 percent chance of visibilities less than a mile across much of the area. The best chances are north of I-94. Fog could bring slow downs for the Thursday morning commute. Through the rest of the week we`ll see mostly sunny skies with highs in the 60s and lows in the upper 30s to mid 40s. There is the potential for fog each morning as well. - Chances for Rain Return Next Week The upper level pattern changes for next week bringing several shortwave troughs through the region along with better moisture. This can be seen in the long range ensemble members that start to bring in precipitation chances as early as Monday. More members are dry Monday, therefore the NBM does not highlight any chances. A larger number of members show rain Tuesday into Wednesday with chances likely lingering through the rest of the week. && .AVIATION /18Z TAFS THROUGH 18Z THURSDAY/... Issued at 122 PM EDT Wed Oct 21 2026 Clear skies will persist through the period. Dense fog is possible at MKG overnight. Otherwise other terminals will see patchy fog. && .MARINE... Issued at 205 PM EDT Wed Oct 21 2026 Dry conditions continue with high pressure remaining in the area keeping wave heights around a foot or less through Friday. Southerly winds build this weekend and may approach Small Craft Advisory criteria Saturday north of Grand Haven. Waves will also build Saturday as well with the potential for 4 foot waves around 5 NM from shore north of Whitehall. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...RAH AVIATION...04 MARINE...RAH

NWS GRR Office Area Forecast Discussion