700
FXUS63 KFSD 201943
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
243 PM CDT Sat Jul 20 2024

.KEY MESSAGES...

- Widely scattered showers and thunderstorms are expected this
  afternoon and evening, then again on Sunday. Some funnel
  development may be possible this afternoon along a weak
  surface front, but still unlikely with low confidence. Severe
  weather is unlikely with any activity this afternoon into
  Sunday.

- Many outdoor events this weekend will want to make sure to
  have an eye on the radar as activity this weekend will be
  rather variable in location and rapid to develop.

- Cooler than normal temperatures continue into Tuesday, with
  near daily rain chances. Rain however won`t impact all
  locations, and will be very hit-or-miss.

- Temperatures will begin to climb upwards for the second half
  of the week, with 50-70% probabilities of 90 degree
  temperatures along and west of the James River by Friday.

&&

.DISCUSSION...
Issued at 241 PM CDT Sat Jul 20 2024

Diurnally driven scattered showers and very isolated thunderstorms
are expected late this afternoon into the evening. With CAPE around
1000 J/kg but no shear and freezing levels about 11-12 kft severe
weather is very unlikely. However with lower LFC`s an isolated
funnel cloud will remain possible as well as very locally heavy
rain. With light winds and a fairly saturated boundary layer fog
will again be possible overnight into Sunday morning.

Sunday should see another uptick in shower and thunderstorm activity
during the afternoon and evening as the upper level low is slow to
move out. Model soundings suggest that not a lot of heating will
lead to scattered showers and isolated thunderstorms with a very
similar environment to today. That means very little severe weather
threat, but isolated locally heavy rainfall will be possible.

Very little changes Monday into Tuesday as model soundings continue
to show the potential for mainly diurnally driven showers and
isolated thunderstorms. Nothing overly organized with a slightly
better chance east of the James River. Nothing expected to be severe
with marginal CAPE and little to no shear. Once again the threat
will be very localized heavy rain. Temperatures remain below normal
but do warm a touch into the upper 70s to lower 80s.

Drier and warmer weather returns Thursday into Saturday as upper
level ridging builds across the Plains. Should see widespread highs
in the mid and upper 80s with lows generally in the 60s, although by
late in the week lows may only fall into the lower 70s. If any
thunderstorms can develop it appears the better chance would be in
central through northeast SD where the axis of better instability
should be.

&&

.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...
Issued at 1149 AM CDT Sat Jul 20 2024

MVFR and IFR conditions in fog and stratus are slowly improving
and little should be lieft after about 19z. Once clouds clear a
bit any small heating should allow isolated to scattered showers
and thunderstorms to develop as an upper level low pressure
moves slowly throgh the area. There should be a down trend in
activity tonight into Sunday morning, then more activity will be
possible again Sunday afternoon.

Fog and stratus will again be possible overnight into Sunday
morning with MVFR and IFR conditions possible.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...None.
IA...None.
NE...None.

&&

$$

DISCUSSION...08
AVIATION...08