Area Forecast Discussion
Issued by NWS Twin Cities, MN

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732
FXUS63 KMPX 212038
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
338 PM CDT SAT MAY 21 2016

.SHORT TERM...(This evening through Sunday)
Issued at 338 PM CDT Sat May 21 2016

One more day of dry conditions are expected as the upper level
pattern begins to change next week. Based on a stronger southerly
flow and abundant sunshine, especially in eastern Minnesota Sunday,
temperatures will rise into the 80s. Depending upon how much mixing
takes place across western Minnesota and the amount of cloud cover
in the afternoon, temperatures in this area may rise into the
mid/upper 80s. Boundary layer moisture will finally begin to
increase in the western quarter of the state Sunday. Dew points will
likely increase into the low to mid 50s ahead of a storm system
moving across the Northern Plains. Based on several of the CAMS
expect the precipitation to hold off until after sunset in western
Minnesota Sunday.

.LONG TERM...(Sunday night through Saturday)
Issued at 338 PM CDT Sat May 21 2016

An omega block across North America on Sunday will break down
early next week as the eastern low shears northeast. This low
will be replaced with a massive ridge building across the eastern
United States and western Atlantic, placing the FA in a southwest
flow aloft. The western low/trough will pretty much remain in
place with pieces of energy emanating from this feature and
heading northeast across the Upper Mississippi Valley.

The pattern that unfolds next week will be one where precipitation
is possible nearly every day of the long term. However, there are
three main periods for showers and thunderstorms. The first is
Monday and Monday night, the second being Wednesday into Thursday
with the last being Friday into Saturday. The moisture/precipitation
surges seen in the ECMWF are Wednesday and Friday while the GFS is
Thursday and Saturday. Hence, there are some timing differences
between the two deterministic solutions down the road.

Temperatures will average above normal next week. Highs and lows
will be some 10 degrees above normal from Monday through Wednesday
and then at least 5 degrees above normal Thursday through
Saturday. Rainfall amounts next week will likely total in the 1 to
2 inch range with local amounts around three inches where
repetitive rounds of convection occur.

A period of concern is Monday and Monday night. Various CAMS
indicate that there will be a dying line of convection entering
western MN early Monday morning while another line of showers and
thunderstorms develops near the Twin Cities around daybreak
Monday and pushes into western WI before diminishing. This latter
activity is associated with low level moisture transport and
developing instability. None of this activity is expected to be
severe as the right entrance region of the upper level jet over
the Dakotas Sunday evening is in a weakening mode and lifting
northeast.

Monday afternoon and Monday evening may be a different
story due to a combination of daytime heating, left over
boundaries from earlier convection, as well as a short wave
moving in from the central plains. Shear values are adequate by
late in the afternoon to the west and north of the Twin Cities
with a NE-SW broken line of storms expected to develop. The
storms would then pass across the Twin Cities and western WI
during the early evening hours with a few strong to severe storms
possible.

&&

.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1205 PM CDT Sat May 21 2016

VFR and no aviation concerns through tonight. Sunday morning will
see increasing south-southeast winds along with gusts of 20-24 kts
in western Minnesota.

KMSP...

No additional concerns with increasing south-southeast winds of
12-14 kts by the end of the taf period.

/OUTLOOK FOR KMSP/

MON...Mainly VFR. TSRA likely with MVFR possible. Wind S 10-15 kts.
TUE...Mainly VFR. Chc TSRA/MVFR. Wind S 5 kts.
WED...Mainly VFR. Chc TSRA/MVFR. Wind light and variable.

&&

.MPX Watches/Warnings/Advisories...
WI...None.
MN...None.
&&

$$

SHORT TERM...JLT
LONG TERM...RAH
AVIATION...JLT



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