652 FXUS63 KGRR 300517 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 117 AM EDT Thu Jul 30 2026 .KEY MESSAGES... - Dry Conditions Continue into Friday - Rain Chances Increase Friday Night Into Saturday && .DISCUSSION... Issued at 223 PM EDT Wed Jul 29 2026 - Dry Conditions Continue into Friday Upper level ridging will continue to build into the area into Thursday. High pressure will be in place into Friday with dry conditions expected and highs in the 80s with lows in the 50s to low 60s. Expect cooler daytime temperatures along the lakeshore with winds off of Lake Michigan. - Rain Chances Increase Friday Night Into Saturday A shortwave trough moves through Friday night into Saturday bringing our next chance for rain. The surface low is expected to track south of the area, but increasing precipitable water values and mid level lift should support the development of rain showers starting Friday night and continuing into Saturday. At this time CAPE is limited, but can`t rule out some thunder during this timeframe. Rain likely clears Saturday night, but some variability in timing exists. If the trough lingers we could see rain chances extend into Saturday night. After the trough clears pressure heights increase and high pressure builds back into the area. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 116 AM EDT Thu Jul 30 2026 Skies will remain mostly clear throughout the period as high pressure settles over the state. Light and variable winds will become WNWly by late morning as a few cu develop. && .MARINE... Issued at 223 PM EDT Wed Jul 29 2026 High pressure will be in place into Friday. Northerly winds become southwesterly Thursday into Friday around 5 to 15 knots. Rain showers move in Friday night into Saturday with dry conditions returning for Sunday. A few rumbles of thunder are possible. Wave heights are expected to be 2 feet or less into Sunday with areas toward the open waters potentially hitting 3 feet on Sunday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...RAH AVIATION...04 MARINE...RAH

NWS GRR Office Area Forecast Discussion