438 FXUS63 KGRR 190525 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 125 AM EDT Thu Mar 19 2026 .KEY MESSAGES... - Mixed precipitation late tonight-Thu morning; Rain possible Fri - Warmer Saturday with Rain changing to snow Sat night-Sun - Dry early next week with seasonable temperatures && .DISCUSSION... Issued at 256 PM EDT Wed Mar 18 2026 - Mixed precipitation late tonight-Thu morning; Rain possible Fri The patchy freezing drizzle that was observed at a few locations earlier has pretty much ended across the area per sfc observations all above 6 miles, and the radar returns from earlier having moved out. We can not rule out a brief patch this afternoon with a few more echoes on the radar toward KMKG, however it should remain much more isolated this afternoon. Our focus then quickly turns to a wave of precipitation that will approach the area after midnight and last through tomorrow morning. This is a complicated setup, which has led, and still is providing a bit of uncertainty in the forecast. We have a front that is dropping down into the area, while a sfc wave moving to our SW is interacting with the front. This is going to lead to a relatively narrow band of precipitation focused just to the north of the sfc wave. The exact track of this precipitation is leading to a portion of the uncertainty. The other part of the uncertainty is the timing and therefore sfc temperatures with regards to freezing of when the precipitation arrives. The most likely scenario is that the band of precipitation will occur south of the I-96 corridor. This is what probably the best consensus is at this time. However, there are model/ensemble members that take it north of there, and others that bring little to no precipitation. The other likely part of this scenario is that this precipitation will come in before daybreak Thu. This increases the chance that some of the precipitation will fall as freezing rain. All of this said, there is not enough confidence to issue an advisory at this time. The good thing with this is that we should see temps warm above freezing for most locations by mid-late Thursday morning. This will end the threat of the icing impacts for the area, along with the precipitation moving out. We will see another short wave move through the region, with this one further north than today`s and tonight`s waves. We will be a bit warmer when this system comes through, and the precipitation shield with this will be further north also. This should not be a big deal with just some chances for rain, highest to the NE. - Warmer Saturday with Rain changing to snow Sat night-Sun Southerly flow will hold on Saturday, even in the wake of the Friday wave. This is going to give max temps for Saturday a head start, with max temps topping out at least in the 50s up north, and 60s down south. In fact, the front that will be coming down has showed a slowing trend, and will give the area a good chance of a warm spring day, especially for areas away from Lake Michigan. This warm up will be short lived as a stronger upper wave will come by and push a stronger cold front through the area. The frontal passage itself Saturday night will be mostly dry as the flow ahead of it will be coming from the Plains. This means there will be little to moisture initially available. A better chance for precipitation will come late Saturday night and into Sunday post frontal. Initially most of the precipitation could be rain as enough warmer air lingers. We could see it turn to some snow possibly early Sunday as enough cold air moves in. - Dry early next week with seasonable temperatures Behind the cold front and upper wave on Sunday, we will see a fairly strong Canadian ridge move in for at least Monday. Some uncertainty has crept in with additional short waves trying to drop in as early as Tuesday, and more likely Wednesday. This pattern will keep temps in the seasonable range. && .AVIATION /06Z TAFS THROUGH 06Z FRIDAY/... Issued at 125 AM EDT Thu Mar 19 2026 Made very few changes to the inherited TAFs for this update. We continue to expect chances for FZRA this morning. Radar indicates a scattered coverage of convective cells approaching from the northwest. This should result in spotty and episodic ice accumulations. Hence, we believe that PROB30 continues to be the best way to represent this threat. As noted previously, we do expect a period of IFR ceilings as well for GRR, AZO and BTL. The good news is that warming temperatures late this morning and increasing cloud bases will eliminate the threats of freezing precipitation and ceiling restrictions by afternoon. && .MARINE... Issued at 256 PM EDT Wed Mar 18 2026 We will cancel the southern two marine zones a little early with this afternoon`s package. Winds have come down sufficiently along the entire nearshore. Now we just have to wait for the waves to follow suit in their typical lagging fashion. Our next marine headline will likely be a Small Craft Advisory needed beginning during the Thursday night-Friday time frame. That event will be a flow from the SW on the front end, and then NW on the back end. && .HYDROLOGY... Issued at 256 PM EDT Wed Mar 18 2026 This flooding event has just about peaked with the four sites near or above flood stage having crested. With light amounts of precipitation expected over the next few days, additional flooding is not expected. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...NJJ AVIATION...TJT MARINE...NJJ HYDROLOGY...NJJ

NWS GRR Office Area Forecast Discussion