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 44 45 46 47 48 49 50

FXUS63 KFSD 241148

Area Forecast Discussion
National Weather Service Sioux Falls SD
648 AM CDT Wed May 24 2017

.SHORT TERM...(Today and Tonight)
Issued at 403 AM CDT Wed May 24 2017

Relatively quiet weather day today as surface high pressure moves
across the region.  While starting off fairly cool, expect
temperatures to rebound into the 60s with 850 hpa temps hanging in
the 5-7 C range throughout the day.  Could see some diurnal cumulus
develop today.

Clearing skies tonight should allow for good radiative conditions,
however, the increasing gradient and subsequent increasing southerly
winds will keep temperatures warmer across central SD.

.LONG TERM...(Thursday through Tuesday)
Issued at 403 AM CDT Wed May 24 2017

Thursday will see a return to much milder temperatures as upper
ridging shifts eastward through the Plains and shortwave attempts to
top the ridge. A cold front will move in central SD Thursday morning
but gets hung up near the James River during the daytime. With
breezy south southwest winds ahead of the front and west to
northwest winds behind the front, good mixing will allow high
temperatures to reach the low to mid 70s. Moisture looks quite poor
in the low and mid levels, however could see some isolated elevated
showers pop up ahead of the front in east central SD and southwest

Broad trough over south central Canada will turn upper level flow to
the west or southwest heading into the weekend, bringing more
unsettled weather to the northern Plains. Dry weather should prevail
on Friday with mostly sunny skies and decent mixing allowing
temperatures to improve a few degrees from Thursday. Clouds will
likely be on the increase late afternoon into Friday night with the
arrival of the first in a series of several waves impacting the
region. Scattered showers with a few isolated thunderstorms will
spread eastward overnight. Timing becomes trickier heading into
Saturday and Sunday, but it is reasonable for shower and
thunderstorm chances are warranted each period.

Upper trough slides eastward into the upper Midwest and western
Great Lakes Sunday and Monday. Another wave drops southeast through
the area on Monday, which will bring additional wet weather to
southwest Minnesota and adjacent areas. Cool northwest flow sets up
Tuesday night and Wednesday, but conditions look largely dry.


.AVIATION...(For the 12Z TAFS through 12Z Thursday morning)
Issued at 638 AM CDT Wed May 24 2017

Valley fog in the James Valley should discipate by 14z or so. Of
greater concern is the IFR stratus across southwest Minnesota. The
stratus should affect the I-29 corridor for the next few hours,
but will gradually raise and scatter out the through the morning.

Expect scattered fair weather cumulus to develop throughout the
day today.  These clouds should disscipate with sunset.

As surface high across the area shifts east, southerly flow will
increase tonight. 40 knot low level jet will develop across
central South Dakota overnight, spreading east Thursday morning.




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