National Weather Service Raw Text Product

640 
FXUS63 KFSD 291710
AFDFSD

AREA FORECAST DISCUSSION
National Weather Service Sioux Falls SD
1210 PM CDT Tue Jun 29 2021

.SHORT TERM...(Today and Tonight)
Issued at 340 AM CDT Tue Jun 29 2021

Early morning water vapor imagery shows a longwave trough draped 
from north to south/southwest along far eastern SD, with radar 
showing a group of showers with isolated thunderstorms moving 
northeastwards into southwestern MN. As the longwave trough 
continues to slowly move eastwards, precip chances will dwindle 
throughout the early morning hours as the main forcing reaches into 
south central MN and north central IA. In the wake of these showers, 
calm conditions and clearing skies have led to patchy/areas of fog 
to develop as temperatures reach their cross-over temps. While 
widespread dense fog is not expected, localized areas could see 
dense fog so remain vigilant and drive to conditions when driving 
through areas of lowered visibilities. 

Shortly after sunrise, any remaining fog should be mixed out fairly 
quickly as mostly sunny skies will allow for mixing in the boundary 
layer to commence. Today will be the coolest day for most with 
afternoon highs in the low to mid 80s, and mostly dry conditions are 
expected as dry air aloft is pulled into the area behind the exiting 
longwave trough. Areas in central Iowa have the best chance at 
seeing a sprinkle or two as the upper level jet entrance region 
exits off to the east, but even then most areas will likely remain 
dry. As upper level ridging begins to take shape, the overnight 
period will remain fairly uneventful with overnight temperatures a 
degree or two on either side of the 60 degree mark. There is a small 
chance we could have some patchy fog again, but without any fresh 
rainfall it's likely we won't have the boundary layer moisture 
available for fog formation.

.LONG TERM...(Wednesday through Monday)
Issued at 340 AM CDT Tue Jun 29 2021

The long term forecast will feature warming temperatures into the 
beginning of next week, with very few chances for precipitation. On 
Wednesday, our region will be caught between an upper level high in 
southern Alberta/Saskatchewan, another one centered over central 
Texas, and an elongated trough moving southwards over the Great 
Lakes region. This keeps upper level flow quite weak over the area, 
and aside from any cumulus clouds that may form, mostly clear skies. 
This will allow for ample sunshine to push areas west of the James 
River Valley near/over the 90 degree mark, with locations along and 
east of I-29 corridor in the mid to upper 80s. 

As the upper level high pressure over southern Canada moves 
eastwards, expect much of the same through the end of the work week. 
Temperatures will increase a bit more over the weekend as the upper 
level high slides directly overhead, with widespread 90s expected 
for the Sunday holiday, Monday, and again on Tuesday. Populated 
guidance did put in some slight chances for rain on Monday and again 
on Tuesday due to a couple shortwaves moving across the region, but 
without great agreement between the extended models have left those 
those precipitation chances untouched.

&&

.AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon)
Issued at 1208 PM CDT Tue Jun 29 2021

VFR through the period.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...NONE.
MN...NONE.
IA...NONE.
NE...NONE.
&&

$$

SHORT TERM...APT
LONG TERM...APT
AVIATION...08