Area Forecast Discussion
Issued by NWS Twin Cities, MN

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FXUS63 KMPX 220858

Area Forecast Discussion
National Weather Service Twin Cities/Chanhassen MN
358 AM CDT Tue Aug 22 2017

.SHORT TERM...(Today and tonight)
Issued at 359 AM CDT Tue Aug 22 2017

Little concern in the short term. Cooler and drier air moving in
for the period.

Satellite imagery showing cloud cover with last vestiges of the
upper trough exiting the far eastern area this morning. We expect
this trend to continue with perhaps a few cumulus redeveloping to the
far east into the early afternoon. Lower level CAA...a bit stronger
to the east...and some pressure gradient should help increase winds
in the 10 to 15kt with gusts to 22kts through much of the
afternoon...especially to the east.

Winds should die off quickly this evening with cool high pressure
continuing to build east.

.LONG TERM...(Wednesday through Monday)
Issued at 359 AM CDT Tue Aug 22 2017

The long term period brings continued cool weather as a mid/upper
trough dominates the eastern half of the CONUS. Other than a small
chance for fleeting light showers on Wednesday, we will be dry
until the weekend with surface high pressure in place.

Highs will be 5-10 degrees below normal on Wednesday and Thursday
with readings ranging from the mid 60s to mid 70s. Lows will even
dip into the mid 40s across the northeast part of the forecast
area (Lake Mille Lacs to west central WI). Weak shortwave energy
in the base of the aforementioned eastern trough could be healthy
enough to generate some light showers on Wednesday and Wednesday
evening, and then more formidable activity arrives on Friday night
as a surface trough/front arrive in conjunction with a shortwave
trough from the west. The setup doesn`t look particularly
threatening as far as severe weather is concerned (given only
moderate instability), but heavy rains could be a factor given
PWATS circa 1.5 inches under prolonged forcing over the weekend.


.AVIATION...(For the 06Z TAFS through 06Z Tuesday night)
Issued at 1050 PM CDT Mon Aug 21 2017

Clearing skies continue working across the area tonight. Wind
should be enough to suppress widespread fog formation, and dry
northwesterly flow. VFR will continue through the period with the
main focus tomorrow being the gusty northwest winds. Generally
expect about 15G25kts at most locations by mid afternoon.
Decoupling near sunset and falling AOB 7 knots tomorrow evening.

KMSP...No change from the main discussion.

WED...VFR. Wind N 5 kts.
THU...VFR. Wind SE 5 kts.
FRI...VFR. Wind SE 5-10 kts.




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