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Displaying AFOS PIL: AFDGRR Received: 2019-05-21 23:32 UTC
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470 FXUS63 KGRR 212332 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 732 PM EDT Tue May 21 2019 LATEST UPDATE... Aviation .SYNOPSIS... Issued at 258 PM EDT Tue May 21 2019 - Rain showers/Isolated thunder late tonight - Heavier rain possible Friday night - Memorial Day weekend seasonably cool, mostly dry && .DISCUSSION...(This evening through next Tuesday) Issued at 258 PM EDT Tue May 21 2019 Primary forecast concerns are timing and amount of precip late tonight and again Friday night. For tonight...showers and isolated thunderstorms associated with warm conveyer belt arrive across the western forecast area after midnight and spread slowly east by daybreak. Back edge moves through by afternoon with enough sunshine for temperatures to recover into the 70s. There is a low chance for showers as a cold front pushes through Wednesday night. Moisture is limited however so most places may remain dry. An active pattern continues through the end of the week with a sfc low pushing a warm front north on Friday. Most of the rain with this low will occur Friday night as showers and thunderstorms fire up along the advancing cold front. Extent of convection could be limited by lack of instability due to late night frontal passage. Memorial Day weekend looks like mostly fair weather as front stalls across the Ohio River valley and Canadian sfc high builds in with seasonably cool weather. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 722 PM EDT Tue May 21 2019 Large area of mid cloud cover observed across the region this evening. Showers and thunderstorms from Minnesota to Arkansas will move northeast tonight, impacting West Michigan TAF sites after 06Z. Have concerns about low level dry air delaying the precipitation from reaching the ground. VFR ceilings will remain for most of the TAF period, with a brief period of MVFR ceilings expected between 12Z and 18Z Wednesday. Gusty winds will continue from the east and southeast as the system approaches. Low level wind shear will increase this evening with speeds of 40 to 50 knots possible between 03 and 13Z. Rain should end rather abruptly Wednesday morning with VFR ceilings resuming during the afternoon hours. && .MARINE... Issued at 258 PM EDT Tue May 21 2019 offshore winds tonight and Wednesday will mean wave heights should remain below 4 feet. Winds could gust above 25 knots at times north of Pentwater on Wednesday. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. LM...None. && $$ SYNOPSIS...Ostuno DISCUSSION...Ostuno AVIATION...MWS MARINE...Ostuno