Area Forecast Discussion
Issued by NWS Grand Rapids, MI

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FXUS63 KGRR 191652
AFDGRR

Area Forecast Discussion
National Weather Service Grand Rapids MI
1252 PM EDT Thu Apr 19 2018

LATEST UPDATE...
Aviation

.SYNOPSIS...
Issued at 325 AM EDT Thu Apr 19 2018

A slow moving area of high pressure will drift into the Great Lakes
region today and tonight. The high will remain over our area through
the weekend. The high will bring dry and quiet conditions. Mainly
clear skies are expected the next several days. The next chance of
precipitation comes Tuesday night into Wednesday of next week so we
are looking at a prolonged period of dry weather. We are forecasting
a moderating trend in temperatures the next few days. Highs today
will top out in the 40s, warming the 50s for Friday and Saturday and
reaching near 60 on Sunday. Normal highs for this time of year are
in the upper 50s to around 60 degrees.

&&

.SHORT TERM...(Today through Saturday)
Issued at 325 AM EDT Thu Apr 19 2018

The first order of business was the Winter Weather Advisory
headline. We have dropped it with this forecast issuance as the
precipitation has ended and road temperatures remain near or above
freezing. Road temps range from just above freezing along U.S. 10 to
the middle 30s along I-94. Feel limited impacts will occur this
morning and therefore dropped the headline. Cannot rule out a few
slick spots though as air temps try to drop below freezing towards
sunrise below a clearing sky.

Otherwise, an uneventful short term period is expected with dry
weather and mainly clear skies. There is a period from Friday night
into Saturday when high cloud cover will increase. Skies will
generally be partly cloudy through this time frame. 300-500mb layer
RH values peak Saturday morning around 75 percent though. It may
even trend towards mostly cloudy Saturday morning with the high
cloud cover.

.LONG TERM...(Saturday night through Wednesday)
Issued at 325 AM EDT Thu Apr 19 2018

High pressure will maintain a stretch of dry and quiet weather into
Monday. Meanwhile, large upper low will amble across the country and
into the southeast U.S. early next week. This will precede a
northern stream trough pushing across the Great Lakes Tuesday into
Wednesday. A few previous model runs had scooped the southern low up
ahead of the northern stream trough, bringing it into the Great
Lakes on Tuesday. 19.00Z runs have backed off this scenario, keeping
these systems unphased. Will continue to monitor model trends, but
current forecast keeps Tuesday mostly dry before surface low
pressure and a cold front associated with the approaching upper
trough provides a chance for showers Tuesday night and Wednesday.

Temperatures look to finally reach near normal early next week, with
highs in the low 60s Sunday and Monday, and mid 60s Tuesday.
Temperatures will be cooler near Lake Michigan.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1251 PM EDT Thu Apr 19 2018

Winds will diminish with sunset. Clear skies are expected through
the period.

&&

.MARINE...
Issued at 325 AM EDT Thu Apr 19 2018

Small Craft Advisory remains in effect through midnight. Winds and
waves are on the increase, with Michigan City at the south end of
the lake, blowing at 25-30 knots. The Port Sheldon buoy has 2
footers as of 240am, but that will be on the increase as the waves
fill in along the shore. 4 to 7 footers will be common in the
nearshore waters today. Waves will subside quickly after dark as the
winds come down. A stretch of very quiet conditions is expected from
late tonight through Saturday night with high pressure centered over
the Great Lakes.


&&

.HYDROLOGY...
Issued at 740 AM EDT Thu Apr 19 2018

Lowland flooding near riverbanks will be ongoing over the next
several days as water from last weekend`s mixed precipitation event
moves through the river basins. Since no heavy rain events are
anticipated through at least early next week, river levels will
gradually crest then subside. The exception may be the Muskegon
and Chippewa Rivers, which still have a fair amount of surface
water locked up as snow/sleet. That snowpack will gradually melt
with warmer temperatures this weekend, so flood concerns are
limited though river levels will remain elevated.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
LM...Small Craft Advisory until midnight EDT tonight for LMZ844>849.

&&

$$

SYNOPSIS...Duke
SHORT TERM...Duke
LONG TERM...HLO
AVIATION...04
HYDROLOGY...CAS
MARINE...Duke



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