322 FXUS63 KGRR 021018 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 618 AM EDT Fri Oct 2 2026 .KEY MESSAGES... - Rain ends, then clearing - Frost tonight, Sunday night, Monday night && .DISCUSSION... Issued at 304 AM EDT Fri Oct 2 2026 - Rain ends, then clearing Local radar shows light rain gradually ending from north to south early this morning as drier air begins to flow in behind a cold front that has just passed through the state. Overall, the rain was a good soaker and we won`t see much in the way of precipitation through next week. IR loop shows the back edge of the thick higher cloud deck moving across northern Lake MI and mostly clear skies over Wisconsin. We`ll see clearing occur this morning leading to mostly sunny skies by this afternoon. - Frost tonight, Sunday night, Monday night A shot of cooler air behind the departing cold front, coupled with light winds and clear skies tonight will enable good radiational cooling conditions. We`re looking at a frost potential over the northern cwa and we`ve issued a frost advisory for several counties of the northern two rows of counties, where temperatures will fall into the lower to mid 30s. It`s possible that a few low lying areas fall below freezing, but it`s not clear it will be widespread. As the high drifts east through Saturday, southwest winds will develop and temperatures will climb from highs in the mid 60s today and Saturday to upper 60s Sunday. A secondary cold front will move across the state Sunday afternoon and send h8 temperatures from 10c down to 0c by Monday morning. Frost is again possible over interior portions of the northern two rows of counties. However, the coldest night will be Monday night. Widespread frost is possible across the entire cwa and sub freezing temperatures over the northern row of counties in the cwa; a freeze warning may be needed there Monday night. Temperatures will warm into the upper 60s Tuesday through Friday next week. Dewpoints in the 40s and 40s will make for comfortable fall conditions. && .AVIATION /06Z TAFS THROUGH 06Z SATURDAY/... Issued at 137 AM EDT Fri Oct 2 2026 Light rain continues at the terminals, but the back edge is about to move across MKG. It will be a few more hours before rain ends at JXN. Latest guidance suggests a fairly quick rise in ceilings once the rain ends with all of the terminals becoming VFR by mid morning. Given the rainfall of the past couple of days, clearing skies tonight and light winds may produce some fog after 06z. && .AVIATION /12Z TAFS THROUGH 12Z SATURDAY/... Issued at 616 AM EDT Fri Oct 2 2026 Rain has ended across the terminals and we`re well on the way to improving conditions. IR imagery shows a well defined clearing line bisecting the state. We should see bkn cirrus by 14z at all the sites. && .MARINE... Issued at 304 AM EDT Fri Oct 2 2026 No changes to the small craft advisory. Increasing north winds behind a cold front will boost waves to 2 to 5 fee today before diminishing this evening. Increasing southwest winds early Sunday ahead of the next cold front may necessitate another small craft advisory then. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...Frost Advisory from 10 PM this evening to 8 AM EDT Saturday for MIZ038>040-044-045. MARINE...Small Craft Advisory until 8 PM EDT this evening for LMZ844>849. && $$ DISCUSSION...04 AVIATION...04 MARINE...04

NWS GRR Office Area Forecast Discussion