National Weather Service Raw Text Product

Displaying AFOS PIL: AFDGRR Received: 2017-09-13 07:29 UTC


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