Area Forecast Discussion
Issued by NWS Twin Cities, MN

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094
FXUS63 KMPX 222053
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
353 PM CDT Thu Jun 22 2017

.SHORT TERM...(This evening through Friday)
Issued at 353 PM CDT Thu Jun 22 2017

Cold front was just now making it into eastern MN, and clearing
has moved into west central and central MN behind the front. Upper
trough axis is expected to move across the area late tonight and
Friday morning, but main forcing will depart this evening. There
is some decent fgen across the area, and radar does indeed show
some bands of heavier precip. But the only thunder threat is
across south central into southeast MN, and even that should end
by early evening.

A fairly dense band of stratucu in Manitoba and Saskatchewan had
moved into northern ND and MT, associated with the upper low now
in central Manitoba. As the low moves across northern Ontario
tonight, northwest flow will bring the clouds over our area
tomorrow morning. Thus think that a large part of central MN into
WI will see plenty of clouds tomorrow. Southwest MN might escape
some of this, but even that is doubtful. Looks like mostly cloudy
and cool conditions tomorrow, and a bit blustery, especially in
western MN, but with some peeks of sun.

.LONG TERM...(Friday night through Thursday)
Issued at 353 PM CDT Thu Jun 22 2017

Little change to the long term period.  The primary topic of
discussion continues to be the longwave trough taking hold over
eastern North America keeping us in cool northwesterly flow this
weekend, with bouts of showers and possibly a few weak
thunderstorms.

By tomorrow evening, the cooler airmass will be in place with the
main jet to our south.  A shortwave trough will be in the process of
diving south across Canada, headed for our area by Saturday.  Given
the PV advection and steepening lapse rates due to upper level
height falls and diurnal heating, we should see showers develop,
with weak thunderstorms possible during the afternoon.  Average
highs are now in the low 80s, but the weekend will be held in the
mid and upper 60s across the region.

Nothing really changes Sunday, more perturbations in the flow will
move through and we again have chances for showers and weak storms
under cyclonic flow aloft.

The western CONUS ridge looks to progress east by midweek, pushing
the trough well east of us and bringing warmer air back to the
region. Temperatures look to climb back to normal for late June
by the middle of the week.

&&

.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 353 PM CDT Thu Jun 22 2017

A broad area of showers will persis into the evening from south
central MN into WI, but thunderstorms were ending over central MN
into WI, and it looks like they will end this afternoon over most
of the remaining area, with the possible exception of far
southern MN over to KEAU. Visibilities will drop to MVFR in the
few remaining thunderstorms, but otherwise will remain VFR.

KMSP...
Storms may persist into mid afternoon but that is uncertain. It is
more apparent that showers will continue to move across the area
through 00Z. Wind direction should flop around a little bit during
the early afternoon prior to frontal passage, but then nw winds
are expected the rest of the afternoon. Gradient will drop off
this evening, giving rise to light wsw winds, but decent hookup
tomorrow may result in gusty nw winds. Right now, gusts are only
expected around 15-20 knots.

/OUTLOOK FOR KMSP/ Sat-Sun...Mainly VFR. Slight chc -TSRA/MVFR.
Wind NW 5-10 kts. Mon...VFR. Wind NW 5-10 kts.

&&

.MPX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
&&

$$

SHORT TERM...TDK
LONG TERM...SPD
AVIATION...TDK



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