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

000
FXUS63 KFSD 160345
AFDFSD

Area Forecast Discussion
National Weather Service Sioux Falls SD
1045 PM CDT Fri Mar 15 2024

.KEY MESSAGES...

- Elevated to potentially critical fire weather conditions
  possible Saturday, and a Fire Weather Watch has been issued
  for most of our MN/SD counties. Sunday will see similar
  wind/RH conditions, but may be a bit on the cold side.

- Cooler temperatures and breezy conditions are expected heading
  into the weekend, with highs below seasonal normals Sunday.

- Pattern shift possible by late next week which could bring
  increasing chances for precipitation back to the forecast.

&&

.UPDATE...
Issued at 416 PM CDT Fri Mar 15 2024

After coordination with neighbors in MPX/ABR, as well as MIFC
(Minnesota Interagency Fire Center), decided to issue a Fire
Weather Watch for our portions of the forecast area Saturday
afternoon and early evening. Humidity levels are borderline when
it comes to strict Red Flag criteria, which is typically below
25%. However, feel strong winds and very dry fuels in the areas
which did not receive rainfall with the system earlier this week
would be able to overcome the marginal RH values, with rapid
fire spread still possible.

&&

.DISCUSSION...
Issued at 246 PM CDT Fri Mar 15 2024

Quiet conditions continue to prevail across the region, with latest
observations showing temperatures in the upper 40s to lower 50s and
a bit of stratocu still lingering east of I-29. Winds during this
time have also become more westerly, with gusts between 15 to 25
MPH. Heading into the evening and overnight period, expect a
pronounced upper level trough and low pressure to take aim at the
Great Lakes Region. Sfc cold front will move in tandem with this
feature and slide overhead the region prior to daybreak Saturday. In
addition to cooler temperatures, this boundary will result in strong
northwesterly winds thanks to a tightening SPG. Thus, have gusts
between 25 to 35 MPH for much of the day Saturday, with isolated
gusts to 40 MPH possible. As noted in days past, with dry fuels
and low dewpoints also in place, expect to see critical fire
weather conditions prevail for a vast majority of our area. Do
think it`s worth noting, however, that minimum RH values may be
somewhat of a limiting factor - as the lowest values generally
occur when gusts start to subside late in the day. Nonetheless,
still strongly encourage you to refrain from any activities
that may cause a spark!

Breezy conditions look to briefly subside Saturday night as lows
fall into the 20s. Otherwise, expect much of the same Sunday, in
terms of dry weather and breezy northwest winds, with gusts once
again between 25 to 35 MPH. While the risk for fire danger is there,
expect highs in the 30s to lower 40s to help mitigate the overall
threat.

Upper level ridging prevails over the western CONUS heading into the
new week as a pronounced upper level low wobbles over southern
California. Given that the region will be centered in northwest flow
aloft, expect to see dry conditions continue with temperatures
gradually rising back into the 50s to 60s by Wednesday. Flow turns
more zonal heading into Thursday, with an upper level shortwave
progged to eject eastward across the Northern Plains. While most
guidance does hint at the potential for seeing precipitation return,
it`s still a bit too far out to put too much confidence behind any
one solution just yet. Thus, will continue to monitor trends in the
coming days.

&&

.AVIATION /06Z TAFS THROUGH 06Z SUNDAY/...
Issued at 1045 PM CDT Fri Mar 15 2024

Gusty winds will be the focus of this TAF period. Southwest flow
early in the period, ahead of a trough/cool front moving southeast
across the region, will generally see gusts remain below 25kt.
Stronger westerly flow above the surface will also produce areas
of low level wind shear ahead of the trough through daybreak
Saturday.

As winds swing to the northwest after FROPA, winds will increase
through Saturday morning. Frequent gusts to around 30kt will be
prevalent Saturday afternoon, with occasional higher gusts to
near 35kt possible. Winds should subside around or shortly after
sunset Saturday evening, or 17/00Z-01Z, though gusts to around
20kt are still possible thereafter.

VFR conditions will prevail through the period, though portions
of the Hwy 14 corridor east of KHON may see a brief period of
MVFR ceilings early Saturday morning.

&&

.FIRE WEATHER...
Issued at 416 PM CDT Fri Mar 15 2024

Northwest winds gusting as high as 35 to 40 mph are expected to
develop by midday Saturday, with relative humidity falling to near
critical values of 23 to 30 percent in the afternoon. With fuels
still fully cured and very dry conditions in areas which did not
receive rain earlier this week, a Fire Weather Watch has been
issued for southwest Minnesota, most of southeast South Dakota,
and extreme northwest Iowa.

Sunday temperatures will briefly dip below normal, with highs in
the 30s to lower 40s, but continued windy with northwest winds
again gusting as high as 35 mph. Most areas will again see Very
High grassland fire danger.

Temperatures warm back to above normal Monday into mid week with
a likely continuation of High to Very High Fire Danger. There are
some hints for precipitation potential late next week so that will
be something to keep an eye on.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...Fire Weather Watch from Saturday afternoon through Saturday
     evening for SDZ038>040-050-052>070.
MN...Fire Weather Watch from Saturday afternoon through Saturday
     evening for MNZ071-072-080-081-089-090-097-098.
IA...Fire Weather Watch from Saturday afternoon through Saturday
     evening for IAZ001.
NE...None.

&&

$$

UPDATE...JH
DISCUSSION...SST
AVIATION...JH
FIRE WEATHER...JH


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