Area Forecast Discussion
Issued by NWS Grand Rapids, MI
Issued by NWS Grand Rapids, MI
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607 FXUS63 KGRR 021130 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 730 AM EDT Sun Jun 2 2024 .KEY MESSAGES... - Limited chance of showers today through Monday afternoon - Medium/High Confidence in evolution of upper troughing this week && .DISCUSSION... Issued at 312 AM EDT Sun Jun 2 2024 - Limited chance of showers today through Monday afternoon Weak surface low pressure over central lower Michigan early this morning will shuffle east today. Moisture and clouds in the mid to upper levels will depart but remain in the low levels for some portion of the day. Areas of light drizzle may linger this morning over the middle of lower Michigan. Question will be how quickly does the low stratus mix and scatter into diurnal cumulus. Latest guidance more aggressive with sunshine this afternoon near/west of US-131, while some models including the HRRR leave areas near I-69 relatively gloomy where low level wind convergence and troughing hangs around a little longer on the backside of the low. Will keep about a 10 percent chance of measurable rainfall there this afternoon. Near-normal temperatures today trend seasonably warm on Monday, while humidity will be a little more noticeable (dew points near 60). Upper level flow over the northern CONUS through Monday is fairly zonal but weak, with the next shortwave trough of note approaching Michigan late Monday. Cirro/alto clouds will be streaming in on Monday from upstream thunderstorms. The chance of showers and thunderstorms appears low until late in the day when better 850 mb moisture streams in and instability increases. - Medium/High Confidence in evolution of upper troughing this week Shortwave ridging early this week gives way to height falls by Tuesday as a closed upper low approaches from the northwest. This low figures in the evolution of persistent troughing across the Great Lakes by the end of the week with lower 500 mb heights and low level northwest flow indicating cooler than normal temperatures into next weekend. As far as rain chances, they persist from Monday night through Wednesday in most southerly flow ahead of the upper low and should peak on Monday night as a shortwave trough minors out and again Tuesday night into Wednesday as a cold front will focus rain and embedded thunderstorms. Showery and cool under the upper low for late week and the weekend. && .AVIATION /12Z TAFS THROUGH 12Z MONDAY/... Issued at 728 AM EDT Sun Jun 2 2024 Areas of IFR and patchy LIFR will improve to MVFR this morning and to VFR this afternoon. Winds will go northwest behind the cold front this morning but remain AOB 10 knots. && .MARINE... Issued at 312 AM EDT Sun Jun 2 2024 Limited potential for hazardous conditions in the nearshore Lake Michigan waters today and during the day Monday. Some patches of fog may be present this morning. Winds will be from the northwest and light today, and a little breezier from the south on Monday. Thunderstorms may occur over the water between Monday evening and Wednesday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. MARINE...None. && $$ DISCUSSION...Ostuno/CAS AVIATION...Ostuno MARINE...CAS