Area Forecast Discussion
Issued by NWS Sioux Falls, SD

Home | Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43

FXUS63 KFSD 180845

Area Forecast Discussion
National Weather Service Sioux Falls SD
345 AM CDT Sun Mar 18 2018

.SHORT TERM...(Today and Tonight)
Issued at 344 AM CDT Sun Mar 18 2018

A milder day across the area as a surface ridge axis shifts off to
the east, and in spite of persistent cloud cover temperatures will
climb well into the 40s by afternoon.

By tonight an upper level trough pushes eastward out of the Rockies,
and may see light rain and snow develop through south central SD
overnight. Early in the night temperatures both at the surface and
aloft would support rain, though thermal profiles cool after 06Z and
any precipitation would be in the form of snow at that point. In any
event, QPF amounts are light and accumulation would be minimal. Lows
tonight will be just either side of 30 degrees.

.LONG TERM...(Monday through Saturday)
Issued at 344 AM CDT Sun Mar 18 2018

A couple of upper level impulses drift out of the northern Rockies
on Monday into early on Tuesday, bringing increasing precipitation
chances to our area. Thermal profiles will support snow, though with
highs on Monday and Tuesday generally in the upper 30s to mid 40s
will see snow mix with rain in the afternoons. Snowfall amounts
through the entire period will range around 1 to 2 inches, though it
is unlikely that this amount will be on the ground at any one time
with melting during the day.

An upper level trough rebuilds across the region for Wednesday and
Thursday with warming temperatures and dry conditions. Highs both
days will be in the 40s to lower 50s. Models begin to diverge by the
end of the week into the weekend in the handling of upper level
energy ejecting out of a western CONUS trough, so confidence is low
on timing of rain/snow chances for Friday through Sunday.
Temperatures look to remain at or just above normal for this time of


.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 1041 PM CDT Sat Mar 17 2018

MVFR stratus continues to impact nearly the entire county warning
area, including all TAF sites. Expect ceilings to work down
overnight into IFR before improvement during the day Sunday.
Starting to get a bit of fog to the south in Nebraska and Iowa and
this may impact our TAF sites tonight as well. Current expectation
is for MVFR visibility reductions.




AVIATION...Ferguson is the U.S. government's official web portal to all federal, state and local government web resources and services.