878 FXUS63 KGRR 270451 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 1151 PM EST Mon Jan 26 2026 .KEY MESSAGES... - Snow & blowing snow tonight/Tuesday, cold wind chills - Periods of snow through Friday - Cold this week, not as cold as last week && .DISCUSSION... Issued at 300 PM EST Mon Jan 26 2026 - Snow & blowing snow tonight/Tuesday, cold wind chills Radar shows light lake effect snow showers falling over the cwa. H8 temperatures are still creating enough over-lake instability for snow showers, but the boundary layer is a bit dry, which is why we aren`t seeing more in the way of accumulations. The next clipper will move through tonight and bring another surge of arctic air with it. This clipper will also bring a fairly tight pressure gradient, resulting in gusty winds late tonight and Tuesday; ECMWF ensemble mean is near 35 mph. HREF snowfall progs paint 1-3 inches of synoptic snow after midnight tonight west of US-131 and an inch or so east of there. There could be isolated 4 inch amounts. Bufkit omega profiles show a well defined omega bullseye in the DGZ around 09z tonight at GRR which should result in some heavier snow in prior to sunrise. Of course, this will have a detrimental impact on the morning commute. Given the combination of snow (another 1-2 inches Tuesday) and wind, we`ve issued a winter weather advisory for the western half of the cwa from midnight through 7 pm Tuesday. I wouldn`t be surprised if the advisory is extended in time because lake effect snow will be ongoing for a couple of days. The southeast cwa will won`t see the synoptic snow until later tonight and as a result will see colder temperatures. When combined with the wind, wind chill temperatures will fall to -15 to -20 Tuesday morning; a cold weather advisory is in effect for tonight and Tuesday morning. - Periods of snow through Friday H8 temperatures remain aob -20c through Friday which means lake effect snow will continue. Synoptic enhancement of the lake effect snow will occur Tuesday night and again Wednesday night as short waves rotate through the upper trough and across the cwa. Each wave will increase inversion heights for several hours resulting in more accumulation. By Thursday, boundary layer winds become more northerly which will pull the lake effect snow bands westward toward the lake shore. - Cold this week, not as cold as last week Highs will be in the mid teens this week which is warmer than the single digits of last week, but still much colder than the normal highs around 30. We`re not going to see 30 for a while, but we`ll likely see lower to mid 20s high temperatures Sunday and Monday. && .AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/... Issued at 1151 PM EST Mon Jan 26 2026 Key changes: - earlier onset of visibility restrictions at GRR terminals - added tempo LIFR visibility restrictions during the day at MKG Radar shows an area of snow moving east across Lake MI at this time ahead of an upper PV maximum. Reflectivities have perked up recently along a GRR to BIV line associated with FGEN forcing along the leading edge of a plume of Lake MI modified air. Have therefore added snow to the GRR TAF a bit earlier than what was previously advertised. Otherwise, few changes were made to the inherited TAFs, except to provide a bit more detail regarding evolution of snow and visibility restrictions Tuesday afternoon and evening. As noted previously, BLSN at MKG/AZO/GRR/BTL given gusts of 25-35 knots will be a persistent factor overnight into Tuesday, resulting in occasional, perhaps frequent, IFR visibility restrictions. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...Winter Weather Advisory until 7 PM EST Tuesday for MIZ037-038- 043-044-050-056-057-064-065-071-072. Cold Weather Advisory until 9 AM EST Tuesday for MIZ058-059- 064>067-071>074. MARINE...None. && $$ DISCUSSION...04 AVIATION...TJT

NWS GRR Office Area Forecast Discussion