Area Forecast Discussion
Issued by NWS Twin Cities, MN
FXUS63 KMPX 201756 AAB
Area Forecast Discussion...UPDATED
National Weather Service Twin Cities/Chanhassen MN
1256 PM CDT THU OCT 20 2016
.SHORT TERM...(Today and tonight)
Issued at 350 AM CDT Thu Oct 20 2016
Movement and redevelopment of lower clouds and temperature trends
are the main concerns in the near term.
Current water vapor satellite showing a couple of short waves over
the dakotas/southern Canada which will affect the region next 24
hours. The first located to the southwest...over eastern South
Dakota/northwest Iowa. This is spreading some clouds and even a
band of showers ahead of it over South Dakota. Expect any showers
to dry up as they move east into the drier air over Minnesota.
Clouds may thin some as well. Currently...yesterdays lower clouds
remains trapped under subsidence inversion over the area. Appears
to be eroding some and is moving south out of the area. Should be
out of the region for the most part around 12z. Then expect the
moisture over he eastern Dakotas to move into western areas this
morning with some redevelopment of higher based stratocu farther to
the east into the late morning/afternoon. This will affect overall
temperatures with 40s north and some lower 50s to the south.
The moisture will ride east into the evening...followed by the next
short wave/now over southern Saskatchewan. THis will begin to lift
some waa over the eastern Dakotas and into western Minnesota during
the night. Models move at least some mid level moisture east and
south during the night. If there is any remaining lower cloud around
late afternoon...will likely remain east of the developing warm
front. This should keep lows from dropping off to much...especially
to the west and central with some more clouds around. Will continue
the lower 30s east...and mid 30s to the west for now.
.LONG TERM...(Friday through Wednesday)
Issued at 350 AM CDT Thu Oct 20 2016
Seasonably warm and dry weather will prevail into the start of
next week as high pressure ridging dominates the north central
CONUS between troughs on both coasts. The period will start off
with near to slightly below normal temperatures on Friday, and
then run around 5-10 degrees above normal from Saturday through
the middle of the upcoming week.
By late in the weekend, energy from the western trough starts to
push into the Central Plains. Monday night looks to be the first
real opportunity for measurable precipitation, as the area of warm
air/moisture advection noses into southern/central MN/WI ahead of
the surface trough over the western Dakotas. Higher chances for
showers and thunderstorms arrive Tuesday night and Wednesday as
the trough skirts across the southern MN border toward Lake MI.
While timing is still a tad different between the GFS and ECMWF,
in general agreement has improved. Spatial differences still exist
as well, with the ECMWF featuring the 1-3+ inch bullseye over
central Iowa, and the GFS farther north with the heavier axis
extending from the MN/IA border into west central WI. For now have
included the highest pops south of I-94, and will refine
precipitation amounts with future runs.
.AVIATION...(For the 18Z TAFS through 18Z Friday afternoon)
Issued at 1256 PM CDT Thu Oct 20 2016
VFR stratus across the eastern Dakotas, northern MN and now
developing over western WI will fill in across central and
southern MN late this afternoon and evening. Winds will become
light and variable this evening, then south southeasterly winds
will take hold Friday.
KMSP...Stratus is most extensive just to the east, but it appears
likely by mid afternoon BKN-OVC cigs will return to MSP.
/OUTLOOK FOR KMSP/
Sat...VFR. Wind light/variable.
Sun...VFR. MVFR cigs possible. Wind NW 10-20 kt.
Mon...VFR. Wind light/variable.