Area Forecast Discussion
Issued by NWS Gaylord, MI

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518
FXUS63 KAPX 281930
AFDAPX

Area Forecast Discussion
National Weather Service Gaylord MI
330 PM EDT Sun May 28 2017

.NEAR TERM...(Tonight through Monday)
Issued at 328 PM EDT Sun May 28 2017

High impact weather potential...Minimal. Thunderstorms will be
possible across northeast Lower through mainly late this afternoon.
A few thunderstorms possible on Monday.

Pattern Synopsis/Forecast...Strong closed low just north of
Minnesota this afternoon with a pronounced trough extending
southeastward into Upper Michigan and then curving southward over
Lake Michigan. DPVA and upper divergence on the leading edge of this
trough has been supporting a large area of showers and scattered
thunderstorms over northern Michigan since late this morning.
Meanwhile, an impressive vort max can easily be spotted on satellite
imagery spinning overtop the western tip of Lake Superior with an
agitated cu field developing southward over WI along a quasi-cold
front (more of a surface trough/wind shift line). There is also
somewhat of a dry slot in between the WI boundary and the upper
trough.

Heading into late this afternoon and early evening, the band of
showers and thunderstorms will continue to lift northeast, with the
focus for remaining activity transitioning to northeast Lower and
far eastern Upper. Radar is showing a somewhat rapid erosion of the
western/southern edges of this activity. 0-3km lapse rates just out
ahead of the activity are favorable (up to 7.5 C/km), but with only
limited instability (~500 J/kg of CAPE), do not anticipate any
strong storms for northeast Lower late this afternoon but perhaps
some small hail with the stronger cells. A line of showers is
developing over north central WI along the surface boundary, and
while that activity is expected to diminish as it eventually lifts
northeast into the central UP this evening, hi-res models have been
hinting at the possibility of eastern Upper and Tip of the Mitt
perhaps getting brushed by some dying light showers this evening.
Think they would have a tough time holding together as they
encounter a drier airmass and waning daytime instability, however.

As the dry slot works into northwest Lower through evening, there
will likely be at least partial clearing over our southwestern
counties. Expect the clouds to be more stubborn over eastern Upper
and Tip of the Mitt. Given today`s rainfall and dewpoints in the
upper 40s to low 50s overnight, some radiation fog will be possible
where winds become light...mainly northeast Lower and eastern Upper.

On Monday the upper low will wobble over Lake Superior with several
lobes of vorticity rotating around it. Low level lapse rates will be
very steep, and mid level lapse rates pretty favorable as well with
ongoing cold air advection. This will lead to scattered showers
developing over northern Michigan and possibly a few thunderstorms
once the boundary layer destabilizes producing a few hundred J/kg of
CAPE. The main limiting factor will be a much drier airmass in place
with PWATs around 0.6 to 0.75". So coverage and intensity will be
much more limited than today. The steep lapse rates will make for
efficient mixing, so it will turn breezy by afternoon with gusts up
to 30 mph possible over northern Lower. Eastern Upper and northwest
Lower will be in closer proximity to the upper low, so cloud cover
will be thicker there than down towards Saginaw Bay. As a result,
high temperatures will range from the mid 50s to low 60s over
eastern Upper...to the low 70s near Saginaw Bay.

&&

.SHORT TERM...(Monday night through Wednesday)
Issued at 328 PM EDT Sun May 28 2017

...Cooler...

High impact weather potential...none.

Upper low that starts out along the north shore of Superior will
slowly lift northward, only to be reinforced by another piece of
energy digging south from western Hudson Bay. A slight tendency for
heights to rebound Wednesday, which will contribute to a decrease in
shower chances. Precip and temp trends are the main concern.

Coolish temps aloft, and the occasional passing shortwave and
associated increased moisture, will support a shower risk thru much
of the short term. This will risk be enhanced by diurnal heating in
the afternoon and evening, particularly on Tuesday. Pops will be
highest in eastern upper MI, closest to the upper low (coolest temps
aloft and more moisture availability). Some occasional likely/
numerous pops are in order north of the bridge, with generally no
more than sct to the south. A more emphatic push of drier air
arrives during the day Wednesday, along with somewhat warmer air
aloft. Pops largely disappear Wed afternoon, and cloud cover will
diminish from w to e. Otherwise plenty of cloud cover during these
periods.

Min temps in the 40s. Max temps upper 50s to mid 60s.

&&

.LONG TERM...(Wednesday night through Sunday)
Issued at 328 PM EDT Sun May 28 2017

...Remaining a little cool with small shower chances...

High Impact Weather Potential...None.

The upper level trough moves ever so slowly to the north and east
over the next several days. Disturbances moving through this trough
will bring periodic rain shower chances across northern Michigan.
Weak high pressure is expected to lead to precipitation free
conditions Thursday but shower chances return for Thursday night.
Perhaps another dry day Friday but more shower chances next weekend
as low pressure tracks along the base of the trough. The chances are
on the low side as the details are uncertain at this point. Hope to
get a better handle on the situation over the next couple of days.
Temperatures are expected to be a little below normal through next
weekend (which isn`t overly cool really).

&&

.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 207 PM EDT Sun May 28 2017

Band of showers continues to lift northeast across northern MI
with scattered thunderstorms just out ahead. Heavier downpours
reducing visibilities and ceilings down to IFR at times. Expect
thunderstorms are pretty much over for KMBL, KTVC, and KPLN as
leading edge of the activity is now advancing into northeast
Lower, so KAPN will stand the best chance for any thunder the
rest of this afternoon. Hi-res models show the bulk of rain
clearing out of the western terminals by around 21Z and out of
KAPN by around 23Z. There could be a lingering isolated light
shower or two behind this main batch of rain through early
evening as a boundary approaches from the west.

Clearing line evident on satellite now over western Lake Michigan
will creep into northern Lower towards evening with partial
clearing possible for KMBL, KTVC, and possibly KAPN overnight.
With today`s rainfall, this would set the stage for some
radiation fog overnight with MVFR vsbys possible, mainly for KAPN
and KPLN where SW winds will be a tad lighter. Scattered showers
and possibly a storm or two expected on Monday with SW winds
becoming a bit gusty towards afternoon.


&&

.MARINE...
Issued at 352 AM EDT Sun May 28 2017

Low pressure slowly drifts through Ontario through Monday, with the
pressure gradient remaining loose through this evening, with
relatively light flow and developing lake breezes this afternoon.
The gradient tightens up late tonight into Monday with a chance for
some low end advisory level gusts through Tuesday.


&&

.APX WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LH...NONE.
LM...NONE.
LS...NONE.
&&

$$

NEAR TERM...MEK
SHORT TERM...JZ
LONG TERM...AJS
AVIATION...MEK
MARINE...SMD



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