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Area forecast discussion 
National Weather Service Grand Rapids Michigan
330 PM EDT Tuesday Apr 28 2015

Latest update...
synopsis/short term/long term/marine

Synopsis...
issued at 330 PM EDT Tuesday Apr 28 2015

Generally fair weather will prevail into the weekend. There will be
a few showers Wednesday afternoon into Thursday morning but these
should be light and not amount to much. Showers and thunderstorms
are possible late Sunday into Monday.

&&

Short term...(this evening through Thursday night)
issued at 330 PM EDT Tuesday Apr 28 2015

Expect some patchy frost again tonight but coverage is not
expected to be as extensive as last night so no advisory will be
issued for those counties where the growing season has started.

Otherwise...no impact weather in the near term. Some isolated
showers are possible Wednesday morning with coverage increasing by
the afternoon as moisture depth increases in advance of upper
level low moving in. This feature dives due south Wednesday night
and will provide enough lift for scattered showers into Thursday
before it continues off to the southeast to be replaced by
shortwave ridging late Thursday night.

Long term...(friday through tuesday)
issued at 330 PM EDT Tuesday Apr 28 2015

We haven't seen thunderstorms in a while but it appears as though
we'll have a couple of opportunities during the short term.

A weak trough moving through the Great Lakes may produce a light
shower over the eastern County Warning Area Saturday afternoon. Mostly it will be
dry though. A higher chance of showers and thunderstorms will
develop Sunday as a warm front moves north toward lower Michigan.
Low pressure in the upper Missouri Valley will move east during this
time. The south flow will help to push temperatures into the 70s...but just
how far into the 70s will depend on how much rain we see. Think most
of the precipitation will hold off until Sunday night and Monday when the low
and trailing cold frontal boundary move across the County Warning Area. The European model (ecmwf) is
wetter due to the cold front hanging up over the central County Warning Area while
the GFS pushes the front through by late Monday. Given recent
history of high pressure winning out over southern Canada and
producing northeast winds across the County Warning Area...the GFS solution seems
more likely to develop. So we/ll go with clearing conditions
Tuesday.

&&

Aviation...(for the 18z tafs through 18z Wednesday afternoon)
issued at 141 PM EDT Tuesday Apr 28 2015

Scattered cumulus will dissipate this evening. An upper low will push
some clouds toward lower Michigan Wednesday morning but ceilings will
be VFR.

&&

Marine...
issued at 330 PM EDT Tuesday Apr 28 2015

Winds and waves will be relatively light into the weekend.

&&

Hydrology...
issued at 1027 am EDT Tuesday Apr 28 2015

Rivers across southwest lower Michigan are around normal levels
and steady or slowly falling. With under a tenth of an inch of
precipitation forecast this week... these trends should continue
through the weekend.

&&

GRR watches/warnings/advisories...
Michigan...none.
Lm...none.
&&

$$

Synopsis...ostuno
short term...ostuno
long term...04
aviation...04
hydrology...63
marine...ostuno

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