347 FXUS63 KGRR 171057 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 657 AM EDT Mon Mar 17 2025 .KEY MESSAGES... - Showers and possible thunder mid week, then colder with rain/snow - Rain/snow next weekend && .DISCUSSION... Issued at 330 AM EDT Mon Mar 17 2025 - Showers and possible thunder mid week, then colder with rain/snow Today and Tuesday will see partly cloudy skies and warming temperatures as high pressure zips across the state. It`ll be short lived though because a lee side low is going to develop in the Plains today and then track toward the western Great Lakes tomorrow. We`ll see an increasingly strong southerly flow develop today that will continue into Wednesday. Temperatures will respond by warming into the 40s today and 60s Tuesday and Wednesday. The surface low will push a warm through north through the central cwa tonight. It might not make it trough the northern cwa Tuesday, which would mean a cooler easterly flow off of Lake Huron. That would keep temperatures in the lower to mid 50s near US-10 Tuesday. However, south of there, we should see highs climb into the lower 60s. Add a couple of degrees to that for Wednesday. As the low moves across the Mississippi early Wednesday, rain will spread in from the west. A strong upper wave will accompany this surface low Wednesday night and provide a few hundred joules MUCAPE for isolated thunder Wednesday evening. A 55kt LLJ will move over the cwa Wednesday evening and gusty winds will be possible as the showers develop. The thunder threat won`t last long and colder air will pour into the cwa after midnight Wednesday night, changing the rain to snow. Light accumulations will be possible again prior to the snow ending Thursday morning. Highs Thursday will be only in the upper 30s. - Rain/snow next weekend Ridging moves in Thursday and early Friday before the next system moves across southern Canada and pushes a cold front across the cwa Friday night. Light rain, possibly mixed with snow across the northern half of the cwa looks plausible Friday night and Saturday and again Sunday night and Monday as yet another low moves across the Great Lakes. && .AVIATION /06Z TAFS THROUGH 06Z TUESDAY/... Issued at 657 AM EDT Mon Mar 17 2025 VFR conditions will prevail through tonight. Winds will go southerly today around 10 knots then increase this evening with gusts over 20 knots along with LLWS. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...Small Craft Advisory from noon today to noon EDT Tuesday for LMZ844>849. && $$ DISCUSSION...04 AVIATION...Ostuno

NWS GRR Office Area Forecast Discussion


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