Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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FXUS63 KGRR 230725
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
325 AM EDT Wed Aug 23 2017

LATEST UPDATE...
Synopsis/Short Term/Long Term/Marine

.SYNOPSIS...
Issued at 325 AM EDT Wed Aug 23 2017

High pressure from Canada will bring dry weather with low humidity
and relatively cool temperatures this week. The fair weather with
cooler than normal temperatures will continue into early next
week.

&&

.SHORT TERM...(Today through Friday)
Issued at 325 AM EDT Wed Aug 23 2017

No significant weather expected in the near term as dry northwest
flow is in place and sfc ridge is building in. The only potential
wrinkle is for some isolated afternoon showers that could result
from lake enhancement today and as a result of a digging shortwave
trough on Thursday. In both cases, soundings only show shallow
moisture which will limit chances enough to leave precip out of
the forecast for now.

Trough axis moves east by Friday with zonal flow and heights
rising a bit. Temperatures should moderate slightly but still
running a bit below the seasonal norms of near 80 maxes and
mins near 60.

.LONG TERM...(Friday night through Tuesday)
Issued at 325 AM EDT Wed Aug 23 2017

More likely than not, the long term period will be dry. Canadian
high pressure will control our weather from Friday night through
Sunday night. Very comfortable conditions are expected. Temperatures
Friday night will be mostly in the 40s and then slowly rise to the
50s for the rest of the period. Highs in the mid 70s are expected
through the period.

Very small chances for showers will enter the picture Monday into
Tuesday. Both the ecmwf and gfs show a short wave rotating through
the upper trough during this time. Moisture will be limited,
however, and widespread rain probably isn`t going to occur.

Although the medium range models are not in good agreement, the
remnants of the tropical system probably won`t affect us. Cold
fronts moving through the Great Lakes will tend to push any system
moving north from the Gulf eastward toward the Mid Atlantic.

&&

.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1247 AM EDT Wed Aug 23 2017

Scattered to broken vfr cu is expected today. Winds will be gusty
from the northwest but diminish around sunset.

&&

.MARINE...
Issued at 325 AM EDT Wed Aug 23 2017

Winds and waves will be decreasing today and the Small Craft
Advisory should be able to be cancelled late this afternoon. There
is a very low chance of a shower and perhaps a waterspout on
Thursday, but chances are low enough to leave out of the forecast
for now.

&&

.HYDROLOGY...
Issued at 1240 PM EDT Tue Aug 22 2017

Area rivers are around normal levels for the time of the year and
well below bankfull. Rainfall over the past 24 hours has mostly been
under an inch, and only minor river rises have been observed. No
significant precipitation is expected Wednesday through the weekend,
so no river issues are expected.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Beach Hazards Statement through this afternoon for MIZ037-043-
     050-056-064-071.

LM...Small Craft Advisory until 6 PM EDT this evening for LMZ844>849.

&&

$$

SYNOPSIS...Ostuno
SHORT TERM...Ostuno
LONG TERM...04
AVIATION...04
HYDROLOGY...63
MARINE...Ostuno



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