Area Forecast Discussion
Issued by NWS Twin Cities, MN

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158
FXUS63 KMPX 310825
AFDMPX

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
325 AM CDT TUE MAY 31 2016

.SHORT TERM...(Today and tonight)
Issued at 330 AM CDT Tue May 31 2016

A band of showers and decaying thunderstorms across western
Minnesota will continue tracking east this morning. Lightning
activity has decreased significantly in the last couple hours with a
stabilizing atmosphere. Still, a large area of moderate rain will
make for a wet morning across the county warning area. The rain will
likely break up across eastern Minnesota and western Wisconsin later
this morning.

Surface low pressure currently over southeastern North Dakota will
lift north then retrograde westward along the Canadian border this
afternoon. This will slow the cold front`s eastward progression into
Wisconsin, and as the atmosphere destabilizes again, a regeneration
of showers and thunderstorms from south central Minnesota to western
and northern Wisconsin is expected. The greatest chance will be east
of a line from Fairmont, to Mankato, St Paul, and Mora. The main
threat with these storms will be heavy rainfall from training cells
and seasonably high pwats around an inch and a half. The activity
will linger well into this evening across western Wisconsin while
the dry slot brings clearing skies to the west.

.LONG TERM...(Wednesday through Monday)
Issued at 330 AM CDT Tue May 31 2016

Longer term issues are timing of frontal exit wednesday morning
and wraparound shower potential over the northern cwa wednesday.
then development of next trough Thursday night/Friday with
cooling trend lingering into the weekend.

Initially...deterministic runs suggest front will have exited the
cwa by by 12z wednesday. Threat of instability showers under the
upper low continues and will hold any pop mainly along and north
of I-94. Cooler air drops into the area wednesday along with lower
clouds. This is expected to limit overall warming during the day
with highs struggling to warm through the 60s in the cloudier
northern cwa. Clearing trend is expected Wednesday night with
surface high spreading into the west. Winds should diminish and
with cool overnight lows.

Return flow and waa patten ahead of the nest trough will develop
mid clouds and the threat of showers/thunder Thursday night. We
confined the threat to mainly along and south of the MN river
valley for now. Both the GFS and ECMWF drop the next trough into
the region Friday and Friday night. Timing of trough brings the
system into the cwa during the day Friday...during peak heating.
Model instability increases modestly along with deep layer
shear...so appears there will some threat of strong/severe storms
Friday into Friday for the area.

Following the front...the upper low develops over the great lakes
region. The GFS has trended like an earlier ECMWF run...more
amplified and slower moving the closed low east. Both suggest
chance of showers/thunder both days as the system exits slowly to
the east. The below normal temperature trend should linger into
early next week.

&&

.AVIATION...(For the 06Z TAFS through 06Z Tuesday night)
Issued at 1055 PM CDT Mon May 30 2016

Thunderstorms are expanding and impacting portions of central and
southern Minnesota late this evening. KRWF/KAXN are being affected
already. We expect the rain to expand into eastern Minnesota
between 2am and 6am. Overall...the amount of thunder and intensity
of rainfall seems to be trending downward for the morning.

KMSP...

Threat for weak thunderstorms are concern primarily for the
morning rush. We think thunder will be in the vicinity just before
sunrise as the traffic volume increases. Storms will be
approaching from the west-southwest late tonight. Overall...the
amount of thunder looks to be less than what we were thinking
earlier today.

/OUTLOOK FOR KMSP/

WED...VFR. Isolated SHRA/TSRA. West wind 10 to 15 knots.
THR...VFR. West-Northwest wind 5 to 10 knots.
FRI...VFR. Chance of MVFR and thunderstorms. South wind 5 to 10
knots.

&&

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

$$

SHORT TERM...BORGHOFF
LONG TERM...DWE
AVIATION...CLF



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