Area Forecast Discussion
Issued by NWS Twin Cities, MN

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FXUS63 KMPX 240432

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
1132 PM CDT TUE AUG 23 2016

.SHORT TERM...(This evening through Wednesday)
Issued at 245 PM CDT Tue Aug 23 2016

The short term concerns remain severe weather and heavy rain threat
this evening.

Water vapor imagery showing a well defined short wave lifting slowly
northeast over northwest Iowa. Most deterministic runs show this
lifting over southern MN and western WI tonight. Some threat of
severe weather...mainly across south central MN this evening as
the upper circulation moves through. Heavy rain will also be a
threat across mainly the southern 2 tier of zones along the MN/IA
border through about 08z. Will continue to mention heavy rain
threat there through the latest HIRES cams a trending
a bit farther south.

The low level flow continues to be directed to the northeast
over the southeast portion of the area overnight as the front moves
into eastern MN by 12z Wed. Clouds and shower remain over the
eastern areas into the morning with drying trend through the rest of
the day with passage of the front.

.LONG TERM...(Wednesday night through Tuesday)
Issued at 245 PM CDT Tue Aug 23 2016

After Wednesday afternoon, the forecast continues to be straight
forward with a dry Thursday and Friday before chances of rainfall
increase again for the first half of the upcoming weekend. Next
week remains unsettled once again, but temperatures should remain
close to normal which is highs in the 70s to near 80 and overnight
lows in the 50s to near 60.

Models continue to hold together a fast west to east flow aloft
with embedded short waves through the next 5 days, with some
differences noted beyond day 5. In the wake of tonights system, a
cool canadian air mass will settle across the region with highs 5
to 10 degrees below normal. Conditions remain favorable for a
widespread storm system with heavy rainfall affecting the Upper
Midwest by late Friday night, and into Saturday. Timing and the
exact location of the heaviest rainfall remains in question, but
more than likely most areas will receive another bout of one half
to locally 1-2 inches. Based on the speed of this short wave and
the winds aloft, Sunday should be drier but I wouldn`t be surprise
to see some instability showers across central Minnesota where the
cooler air mass/residual moisture will reside behind this system.

Again, next week remains unsettled with chances of rainfall almost
each day. Timing and placement will be problematic this early in
the forecast, but based on the overall flow pattern and moisture
levels, rainfall will again be likely. Although guidance does show
some 80s moving back into the forecast next week, with the amount
of moisture and unsettled conditions, will lean toward highs near
80. However, humidity levels maybe higher so expect heat indices
to rise once again.

Beyond day 7 in the forecast, a long wave trough is forecast to
deepen across the western part of North America, with a broad area
of zonal/southwesterly flow developing across the Upper Midwest.
This may be a sign for continued unsettled weather and slightly
higher temperatures in the longer term.


.AVIATION...(For the 06Z TAFS through 06Z Wednesday night)
Issued at 1129 PM CDT Tue Aug 23 2016

Widespread showers and thunderstorms are ongoing across southern
MN and are gradually moving east into WI. KAXN and KSTC are in the
clear for now and will probably stay that way tonight. For the
rest of the night, MVFR conditions with rain and embedded
thunderstorms will be the story. Clouds gradually clear in the
morning as the rain moves east. MVFR will transition to large
areas of IFR as low clouds spread in behind the rain.

Scattered showers will hang around for at least the first half of
the night - most of it will remain across southern MN, but still
close enough to include in the forecast. MFR ceilings, possibly
even IFR possible, for the morning commute.

Wed nite...VFR Wind nw 5-7 kts.
Thu...VFR. Wind NW 7-10 kts.
Fri...VFR. Wind SSW 5-10 kts.


.MPX Watches/Warnings/Advisories...


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