National Weather Service Raw Text Product
Displaying AFOS PIL: AFDGRR Received: 2017-09-13 07:29 UTC
Previous in Time Latest Product Next in Time
View All KGRR Products for 13 Sep 2017 View All AFD Products for 13 Sep 2017 View As Image Download As Text
867 FXUS63 KGRR 130729 AFDGRR Area Forecast Discussion National Weather Service Grand Rapids MI 329 AM EDT Wed Sep 13 2017 LATEST UPDATE... Synopsis/Short Term/Long Term/Marine .SYNOPSIS... Issued at 329 AM EDT Wed Sep 13 2017 Weakening low pressure, formally Irma, will approach from the south today and tonight and bring some cloudiness and perhaps a few showers to southern lower Michigan. Otherwise high pressure and above normal temperatures will dominate our weather through the coming weekend. && .SHORT TERM...(Today through Friday) Issued at 329 AM EDT Wed Sep 13 2017 Will maintain low chance pops today and tonight for a few showers south of a MKG to MOP line as guidance depicts a narrow band or two of mid level fgen related forcing pivoting nwwd around north side of approaching upper low. Overall this system looks quite weak though, and most areas will remain dry. The upper low moves to near IND by 00Z tonight then heads ene from there, reaching PA on Thursday. Height rises take place behind it, with a upper ridge rebuilding over Michigan Thursday- Friday and holding into the coming weekend. Look for any lingering clouds south and east of GRR to pull away on Thursday then mainly clear skies after that. Still a patchy ground fog risk at night as sfc winds remain light/calm. High temperatures are tricky today since extent/persistence of cloud cover is questionable. Will have lower 70s for highs along I-94 where thicker/lower cloud cover is anticipated and upper 70s northwest of GRR where considerable sunshine is still expected. All areas should be around 80 Thursday and Friday. .LONG TERM...(Friday night through Tuesday) Issued at 329 AM EDT Wed Sep 13 2017 Fair and unseasonably warm weather will continue through most of the long range forecast period. An upper level ridge will continue to bring fair wx Friday night through Saturday and persistent southerly flow waa will help to boost max temps into the upper 70's to lower 80's this weekend. A weak front will bring a chance for a few rain showers Sunday afternoon through Sunday night into Monday. A surface high pressure ridge will then build in to bring fair wx for the early to middle portion of next week. High temperatures will continue to reach well into the 70's to near 80 degrees through then. && .AVIATION...(For the 06Z TAFS through 06Z Wednesday night) Issued at 1130 PM EDT Tue Sep 12 2017 VFR conditions will continue at all the terminals overnight. Conditions will gradually deteriorate to MVFR at our southern terminals during the mid mornings hours Wednesday as low clouds and scattered showers move in from the south. The showers will gradually develop further north and affect our northern terminals by late Wednesday morning/early Wednesday afternoon. Showers will exit the area Wednesday evening and conditions should return to VFR at all the terminals Wednesday evening as well. Wind speeds will remain blo 10 kts at all the terminals through the next 24 hrs. && .MARINE... Issued at 329 AM EDT Wed Sep 13 2017 Light winds to persist over Lake MI this week although southerly flow could strengthen Sat and Sat night as frontal boundary approaches from the west. This could lead to some higher waves of 2-4 feet north of Holland over the weekend. && .HYDROLOGY... Issued at 1135 AM EDT Tue Sep 12 2017 Rivers are running at or below normal levels and dry weather will dominate for much of the next week under persistent high pressure. The only exception may be Wednesday, as the remnants of Irma produce areas of light rain. Amounts will likely be under a tenth of an inch, and many areas may not see any rain. Abnormally dry conditions across Southern Lower Michigan (as defined by the National Drought Mitigation Center) will continue with little relief and rivers will continue to run a little low. && .GRR WATCHES/WARNINGS/ADVISORIES... MI...None. LM...None. && $$ SYNOPSIS...Meade SHORT TERM...Meade LONG TERM...Laurens AVIATION...Laurens HYDROLOGY...63 MARINE...Meade