textproduct: Grand Rapids

KEY MESSAGES

- Dry though Saturday

- Periods of Showers and Thunderstorms Saturday Night into Next Week

DISCUSSION

Issued at 213 AM EDT Thu Aug 27 2026

- Dry though Saturday

Drier air is working in behind the cold front that has recently moved through the state. The upper level low will continue to rotate a few shortwave troughs this afternoon and early Friday. Outlier solutions try to pop up some showers and thunderstorms this afternoon and Friday afternoon, but overall probabilities are low (less than 20 percent) for any one location. Pressure heights increase Friday night into Saturday as high pressure builds to our south. Highs into Saturday will be in the 70s to low 80s.

- Periods of Showers and Thunderstorms Saturday Night into Next Week

We'll remain on the northern edge of high pressure into next week. There aren't any significant shortwaves moving through, but the low level jet will gradually shift into the area bringing us multiple chances for showers and thunderstorms starting Saturday night and continuing into next week. Our chances will ebb and flow with the low level jet as it will be our main source of lift along with advecting in some high precipitable water values (1.5 to 2.0 inches) and dew points (60s). There are differences in where exactly the low level jet sets up which will impact who sees the best chances for rain and thunderstorms. There is the potential for heavy rainfall, although probabilities for higher amounts for any one location are low due to the uncertainty of where rain and thunderstorms are most likely to track.

AVIATION /12Z TAFS THROUGH 12Z FRIDAY/

Issued at 635 AM EDT Thu Aug 27 2026

Shallow patchy fog has developed this morning and has caused GRR and JXN to bounce between VFR and MVFR at times. These varying visibilities will end around 13Z with VFR conditions expected for the rest of the day. Some diurnal cumulus around 5000 to 7000 feet will move in during the late morning and afternoon. Winds will be from the northwest and become light and variable overnight. Light fog may redevelop for Friday morning.

MARINE

Issued at 213 AM EDT Thu Aug 27 2026

Winds and waves continue to come down with current observations of waves around a foot and winds 5 to 15 knots. Northwest winds will continue through the day with wave heights around 1 to 2 feet. Winds then become more easterly into Friday morning. The lake breeze will develop Friday afternoon with waves heights around a foot or less.

Our next chance for Small Craft Advisory and High Swim Risk conditions moves in Saturday and continues through at least Sunday due to stronger southwest winds causing waves to build. Our next chance for thunderstorms moves in Saturday night and continues into next week.

GRR WATCHES/WARNINGS/ADVISORIES

MI...None. MARINE...None.