752
FXUS63 KGRR 171827
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
227 PM EDT Tue Sep 17 2024

.KEY MESSAGES...

- Dry and warm weather continues through midweek

- Slight chances for rain late this week into next week

&&

.DISCUSSION...
Issued at 330 AM EDT Tue Sep 17 2024

- Dry and warm weather continues through midweek

Ridging at the sfc/aloft will continue to dominate the wx pattern
through midweek bringing mostly clear to partly cloudy skies and
warm temps. High temps today will be a bit cooler than yesterday
as h8 temps cool a bit to around 13 C. This in conjunction with
ample sun will result in high temps reaching the low to mid 80s
today.

Mins tonight will be mostly in the 50s with potential for some
patchy shallow ground fog again during the early morning hours
Wednesday. High temps Wednesday will once again reach the low to
mid 80s as we continue to have rather large diurnal temp swings
with a relatively dry airmass in place.

- Slight chances for rain late this week into next week

The influence of the blocking high may begin to weaken and translate
east later in the week, allowing some jet streaks and upper-level
troughs or lows to move closer to our region. Per ensembles, the
earliest chance of measurable rain may be Friday, though this is
only a slight chance given so few solutions producing rain. The cold
front that will approach Michigan, associated with a Dakota-Manitoba
low, is likely to get washed out. There is a little better chance of
rain around Sunday, which more EC ensembles are clustering toward as
a more robust northern stream low moves over the Upper Midwest.
However, southern stream ridging from Texas to the Great Lakes at
that time does complicate the picture.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 215 PM EDT Tue Sep 17 2024

Another round of patchy mist/fog Wednesday morning should reduce
visibilities to MVFR/IFR conditions. Main areas of concern will be
JXN, LAN, AZO and BTL with lower restrictions expected at JXN. Any
reducing conditions will improve between 13Z at 15Z.
 High pressure with VFR cigs and vsbys will dominate the rest of
the period.

&&

.MARINE...
Issued at 330 AM EDT Tue Sep 17 2024

Sfc ridging will continue to result in light winds in the 5 to 10
kt range which will become onshore in the afternoon and early
evening daily. Wave heights will remain aob 1 ft through midweek.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Laurens/CAS
AVIATION...Ceru
MARINE...Laurens