347
FXUS63 KGRR 171057
AFDGRR
Area Forecast Discussion
National Weather Service Grand Rapids MI
657 AM EDT Mon Mar 17 2025
.KEY MESSAGES...
- Showers and possible thunder mid week, then colder with
rain/snow
- Rain/snow next weekend
&&
.DISCUSSION...
Issued at 330 AM EDT Mon Mar 17 2025
- Showers and possible thunder mid week, then colder with
rain/snow
Today and Tuesday will see partly cloudy skies and warming
temperatures as high pressure zips across the state. It`ll be
short lived though because a lee side low is going to develop in
the Plains today and then track toward the western Great Lakes
tomorrow. We`ll see an increasingly strong southerly flow develop
today that will continue into Wednesday. Temperatures will respond
by warming into the 40s today and 60s Tuesday and Wednesday. The
surface low will push a warm through north through the central cwa
tonight. It might not make it trough the northern cwa Tuesday,
which would mean a cooler easterly flow off of Lake Huron. That
would keep temperatures in the lower to mid 50s near US-10
Tuesday. However, south of there, we should see highs climb into
the lower 60s. Add a couple of degrees to that for Wednesday.
As the low moves across the Mississippi early Wednesday, rain will
spread in from the west. A strong upper wave will accompany this
surface low Wednesday night and provide a few hundred joules
MUCAPE for isolated thunder Wednesday evening.
A 55kt LLJ will move over the cwa Wednesday evening and gusty
winds will be possible as the showers develop.
The thunder threat won`t last long and colder air will pour into
the cwa after midnight Wednesday night, changing the rain to snow.
Light accumulations will be possible again prior to the snow
ending Thursday morning. Highs Thursday will be only in the upper
30s.
- Rain/snow next weekend
Ridging moves in Thursday and early Friday before the next system
moves across southern Canada and pushes a cold front across the
cwa Friday night. Light rain, possibly mixed with snow across the
northern half of the cwa looks plausible Friday night and
Saturday and again Sunday night and Monday as yet another low
moves across the Great Lakes.
&&
.AVIATION /06Z TAFS THROUGH 06Z TUESDAY/...
Issued at 657 AM EDT Mon Mar 17 2025
VFR conditions will prevail through tonight. Winds will go
southerly today around 10 knots then increase this evening with
gusts over 20 knots along with LLWS.
&&
.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...Small Craft Advisory from noon today to noon EDT Tuesday for
LMZ844>849.
&&
$$
DISCUSSION...04
AVIATION...Ostuno
NWS GRR Office Area Forecast Discussion
