958 FXUS63 KGRR 271800 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 200 PM EDT Sun Sep 27 2026 .KEY MESSAGES... - Dry through Tuesday - Rain Chances Return Wednesday into Thursday - Fair Weather Again for Friday and Saturday && .DISCUSSION... Issued at 200 PM EDT Sun Sep 27 2026 - Dry through Tuesday High pressure remains in place through Tuesday with us sandwiched between the nor`easter to the east and trough to the west. Similar to this morning, fog will be possible early Monday morning toward the Lansing and Jackson areas. Fog could be as dense as this morning with visibilities around a quarter of a mile. If fog develops be sure to use low-beam headlights and give yourself plenty of distance and time for the morning commute. Highs will be in the 70s with lows in the 40s. A few spots along and north of US-10 may drop into the upper 30s. - Rain Chances Return Wednesday into Thursday The ridge overhead will slowly weaken. The timing of this occurring is trending slower as seen in the onset of precipitation chances in the ensembles. As we move into more southerly flow some showers may develop late Tuesday night into Wednesday morning with the best chances (greater than 40 percent) north of a Holland to Grand Rapids to Alma line. With the recent trends it is possible most could stay dry until Wednesday night into Thursday as the front moves in with precipitation chances increasing into the 60 to 70 percent range). Highs in the 70s with lows in the 50s and 60s are expected. - Fair Weather Again for Friday and Saturday High pressure builds in behind the cold front Thursday bringing dry and cooler conditions for Friday and Saturday. Highs are only expected to be in the 60s with the coldest temperatures Saturday morning in the mid 30s to 40s. && .AVIATION /18Z TAFS THROUGH 18Z MONDAY/... Issued at 200 PM EDT Sun Sep 27 2026 This morning featured areas of dense fog vicinity NE-S of LAN and at JXN, and patchy or shallow fog elsewhere. VFR is expected through this evening with generally light winds from the north, though some directional variability with the winds may occur. Similar pattern for tonight into Monday morning with areas of fog expected vicinity of LAN and at JXN, with patchy or shallow fog elsewhere. Moisture below 1,000 feet this evening is expected to flow in off Lake Huron toward LAN and JXN, then diminishing winds late in the night with mostly clear skies will favor fog development. && .MARINE... Issued at 200 PM EDT Sun Sep 27 2026 Light winds continue with waves less 2 feet through Tuesday. Northerly winds continue into Monday with peak winds 10 to 15 knots during the afternoon. Tuesday winds become more southerly and increase Tuesday into Wednesday with gusts potentially approaching Small Craft Advisory criteria Wednesday afternoon. This could result in a brief period of High Swim Risk Conditions north of Grand Haven Wednesday. Winds remain largely in the 10 to 20 knot range into Friday. Southerly winds turn to the northwest behind the front Thursday. Conditions may approach Small Craft Advisory levels at times through Friday with the best chances north of Grand Haven. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...RAH AVIATION...CAS MARINE...RAH

NWS GRR Office Area Forecast Discussion