Area Forecast Discussion
Issued by NWS Marquette, MI

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

FXUS63 KMQT 242355

Area Forecast Discussion
National Weather Service Marquette MI
755 PM EDT TUE MAY 24 2016

.SHORT TERM...(This evening through Wednesday)
Issued at 327 PM EDT TUE MAY 24 2016

Upper air pattern consists of a closed 500 mb over New England and
another over Southern Saskatchewan and one over Central Ca this
morning. There is also a shortwave over the upper Great Lakes this
morning and this moves through the area this afternoon. Another
shortwave moves into the central plains 12z wed and this moves into
the upper Great Lakes by late Wed afternoon. Nam shows some 850-500
mb q-vector convergence and deeper moisture moving through the cwa
this afternoon before exiting by this evening, then both return by
late Wed afternoon across the west. GFS and ECMWF show about the
same thing as well. Overall, going forecast had things well in hand
and have the pops diminishing tonight and bring them back into the
west late Wednesday afternoon.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 353 PM EDT TUE MAY 24 2016

Challenging forecast in the long term as most days will see chances
for convection, but model confidence remains poor in terms of precip
timing through the period. The pattern will be dominated by a large
trough across the west half of the U.S., and a large ridge across
the east half of the U.S. Several short-wave troughs are progged to
eject from the western trough and round the eastern ridge. Upper MI
will be near the top of the ridge, so any shortwave energy rippling
through the ridge will bring chances for showers and some

Wed night into Thu morning will see the first in a series of
shortwaves moving through the area. Model indicated layer
precipitable water values of 1.3-1.5 inches, deep layer moderate
q-vector convergence associated with the shortwave and MUCAPE values
of 500 to near 1000 j/kg will support chances for showers and some
thunderstorms. Some of the models also hint at a second shortwave
moving through on Thu afternoon but forecast soundings show more
mid-level dry air and the potential for more capping which may limit
convection. So will continue to only carry low chance pops for
convection Thu afternoon.

Chances for showers and some storms continue through the weekend
into the early part of next week, but again poor model agreement on
timing of shortwave features will make it hard to pinpoint when
convection will be more likely. Will continue to utilize model
consensus approach for POPS at this time. Also due to poor model
resolution with shortwaves it will be hard to discern if there
will be any severe convection through the extended forecast period.
However, if daytime heating and the timing of shortwaves line up,
some strong to possbly severe storms cannot be ruled out from time
to time.

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 754 PM EDT TUE MAY 24 2016

The arrival of drier air aloft abv lingering llvl mstr wl result in
fog dvlpg over Upr MI tngt, with conditions at the TAF sites
trending toward LIFR thru the ngt. With daytime heating on Wed, the
fog/stratus wl grdly burn off during the mrng, bringing back a
return of VFR conditions by the aftn. More showers wl return in the
aftn ahead of an aprchg lo pres system, but VFR conditions wl
continue thru early evng.

.MARINE...(For the 4 PM Lake Superior forecast issuance)
Issued at 327 PM EDT TUE MAY 24 2016

A period of NE winds of 20 to 25 knots over the western lake is
possible Wednesday as low pressure develops over the plains and
moves to the Upper MS valley. Otherwise, expect winds at or below 20
knots through the forecast period.

Upper Michigan...
Lake Superior...
Lake Michigan...


MARINE...07 is the U.S. government's official web portal to all federal, state and local government web resources and services.