485 FXUS63 KGRR 040641 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 241 AM EDT Thu Jun 4 2026 .KEY MESSAGES... - Dry and Warm Today - Rain and Thunderstorms Return Friday into Saturday - Mostly Dry Sunday into Next Week, Becoming Warmer && .DISCUSSION... Issued at 241 AM EDT Thu Jun 4 2026 - Dry and Warm Today Another dry and warm summer day as the upper level ridge remains over the area. Highs are expected to be in the mid 80s across much of the area with 70s to near 80 along the lakeshore. Low dew points will keep heat index values at or below the air temperatures. Southwest winds pick up this afternoon with gusts around 20 t0 25 mph. - Rain and Thunderstorms Return Friday into Saturday The upper level ridge breaks down tonight into Friday with a shortwave trough expected to moves through Saturday. Ahead of the trough moisture advection with precipitable water values climbing between 1.4 to 1.8 inches into the afternoon. Convergence in the wind field at 850mb to 700mb may spark off some showers Friday morning with the potential for thunderstorms during the afternoon and evening. Friday night into Saturday instability builds with the low level jet working back into the area. 1000 to 2000 J/kg and 40 knots of shear will allow for some more organized strong to severe storms until the cold front moves through Saturday. Best chances for any stronger storms will be along and south of I-96. - Mostly Dry Sunday into Next Week, Becoming Warmer High pressure with an upper level ridge builds back in for Sunday. Looking at different ensemble members there are some signs that there could be a week shortwave that moves through Tuesday into Wednesday. Any precipitation looks light, but overall there is a higher probability of conditions remaining dry in this pattern. Therefore the probability of precipitation next week is limited to 20 to 30 percent at any one time. Temperatures will gradually warm through the week with some spots potentially hitting 90 degrees by midweek. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 241 AM EDT Thu Jun 4 2026 VFR conditions are expected with some afternoon cumulus around 5000 feet. Winds pick up as well with southwest winds gusting 15 to 25 knots. && .MARINE... Issued at 241 AM EDT Thu Jun 4 2026 Southerly winds build with high pressure to the east and low pressure to the west. Some isolated gusts north of Whitehall may approach Small Craft Advisory levels, otherwise the higher gusts are anticipated to remain over land today. As the pressure gradient increases into Friday, Small Craft Advisory conditions become more likely. Rain and thunderstorms will be possible Friday into Saturday before the cold front moves through Saturday afternoon. Some strong to severe storms are possible. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...RAH AVIATION...RAH MARINE...RAH

NWS GRR Office Area Forecast Discussion