Wind Advisory 11, NWS Sioux Falls, SD

152 
WWUS73 KFSD 211327
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
827 AM CDT Tue May 21 2024

SDZ065-066-068>070-211500-
/O.NEW.KFSD.HW.W.0002.240521T1327Z-240521T1500Z/
Hutchinson-Turner-Bon Homme-Yankton-Clay-
Including the cities of Parkston, Tabor, Menno, Vermillion,
Tyndall, Clayton, Viborg, Chancellor, Scotland, Parker, Marion,
Centerville, Springfield, Tripp, Yankton, Avon, Hurley, Freeman,
and Irene
827 AM CDT Tue May 21 2024

...HIGH WIND WARNING IN EFFECT UNTIL 10 AM CDT THIS MORNING...

* WHAT...North winds 35 to 45 mph with gusts up to 60 mph.

* WHERE...Bon Homme, Clay, Hutchinson, Turner, and Yankton Counties.

* WHEN...Until 10 AM CDT this morning.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be difficult, 
  especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain in the lower levels of your home during the windstorm, and 
avoid windows. Watch for falling debris and tree limbs. Use caution 
if you must drive.

&&

$$

IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-SDZ039-040-055-
056-062-067-212130-
/O.CON.KFSD.WI.Y.0011.240521T1900Z-240522T0300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Lyon-Murray-
Cottonwood-Nobles-Jackson-Pipestone-Rock-Kingsbury-Brookings-Lake-
Moody-Minnehaha-Lincoln-
Including the cities of Lennox, Sanborn, Rock Rapids, Orange
City, Windom, Harrisburg, Lake Preston, Sioux Center, Fulda,
Orland, Sioux Falls, Luverne, Hull, Worthington, Larchwood,
Marshall, Pipestone, Flandreau, De Smet, George, Lakefield, Rock
Valley, Hendricks, Spencer, Inwood, Hartley, Sibley, Arnolds
Park, Arlington, Madison, Tea, Mountain Lake, Sheldon, Canton,
Brookings, Spirit Lake, Ivanhoe, Tyler, Hawarden, Slayton, Lake
Benton, Milford, and Jackson
827 AM CDT Tue May 21 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM 
CDT THIS EVENING...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 55 mph 
  expected.

* WHERE...Portions of northwest Iowa, southwest Minnesota, and east 
  central and southeast South Dakota.

* WHEN...From 2 PM this afternoon to 10 PM CDT this evening.

* IMPACTS...gusty winds could blow around unsecured o bjects. Tree 
  limbs could be blown down and a few power outages may result.

$$

JM

901 
WWUS73 KFSD 211349
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
849 AM CDT Tue May 21 2024

SDZ062-067-212200-
/O.EXA.KFSD.HW.W.0002.000000T0000Z-240521T1500Z/
/O.CON.KFSD.WI.Y.0011.240521T1900Z-240522T0300Z/
Minnehaha-Lincoln-
Including the cities of Harrisburg, Lennox, Canton, Sioux Falls,
and Tea
849 AM CDT Tue May 21 2024

...HIGH WIND WARNING IN EFFECT UNTIL 10 AM CDT THIS MORNING...
...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM 
CDT THIS EVENING...

* WHAT...For the High Wind Warning, northeast winds 35 to 45 mph 
  with gusts up to 60 mph. For the Wind Advisory, northwest winds 20 
  to 30 mph with gusts up to 50 mph expected.

* WHERE...Lincoln and Minnehaha Counties.

* WHEN...For the High Wind Warning, until 10 AM CDT this morning. 
  For the Wind Advisory, from 2 PM this afternoon to 10 PM CDT this 
  evening.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be difficult, 
  especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain in the lower levels of your home during the windstorm, and 
avoid windows. Watch for falling debris and tree limbs. Use caution 
if you must drive.

&&

$$

SDZ059>061-064-071-211500-
/O.EXA.KFSD.HW.W.0002.000000T0000Z-240521T1500Z/
Davison-Hanson-McCook-Douglas-Union-
Including the cities of Corsica, Montrose, Alcester, Jefferson,
Bridgewater, Alexandria, Canistota, Beresford, Elk Point, Salem,
Mitchell, Armour, North Sioux City, Emery, and Delmont
849 AM CDT Tue May 21 2024

...HIGH WIND WARNING IN EFFECT UNTIL 10 AM CDT THIS MORNING...

* WHAT...North winds 35 to 45 mph with gusts up to 60 mph.

* WHERE...Douglas, Davison, Hanson, McCook, and Union Counties.

* WHEN...Until 10 AM CDT this morning.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be difficult, 
  especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain in the lower levels of your home during the windstorm, and 
avoid windows. Watch for falling debris and tree limbs. Use caution 
if you must drive.

&&

$$

SDZ065-066-068>070-211500-
/O.CON.KFSD.HW.W.0002.000000T0000Z-240521T1500Z/
Hutchinson-Turner-Bon Homme-Yankton-Clay-
Including the cities of Centerville, Freeman, Tabor, Tripp,
Yankton, Viborg, Scotland, Chancellor, Hurley, Avon, Tyndall,
Springfield, Clayton, Parkston, Irene, Vermillion, Parker, Menno,
and Marion
849 AM CDT Tue May 21 2024

...HIGH WIND WARNING REMAINS IN EFFECT UNTIL 10 AM CDT THIS 
MORNING...

* WHAT...North winds 35 to 45 mph with gusts up to 60 mph.

* WHERE...Bon Homme, Clay, Hutchinson, Turner, and Yankton Counties.

* WHEN...Until 10 AM CDT this morning.

* IMPACTS...Damaging winds will blow down trees and power lines. 
  Widespread power outages are expected. Travel will be difficult, 
  especially for high profile vehicles.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain in the lower levels of your home during the windstorm, and 
avoid windows. Watch for falling debris and tree limbs. Use caution 
if you must drive.

&&

$$

IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-SDZ039-040-055-
056-212200-
/O.CON.KFSD.WI.Y.0011.240521T1900Z-240522T0300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Lyon-Murray-
Cottonwood-Nobles-Jackson-Pipestone-Rock-Kingsbury-Brookings-Lake-
Moody-
Including the cities of Larchwood, Lake Benton, De Smet, Hartley,
Lakefield, Hendricks, Arlington, Orange City, Luverne, Orland,
Jackson, Rock Valley, Spirit Lake, Hawarden, Mountain Lake,
Milford, Windom, Hull, Sioux Center, Arnolds Park, Sibley,
Sanborn, Lake Preston, Madison, Flandreau, Spencer, Worthington,
Marshall, Brookings, Tyler, Inwood, Fulda, Slayton, Pipestone,
Rock Rapids, Sheldon, George, and Ivanhoe
849 AM CDT Tue May 21 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM 
CDT THIS EVENING...

* WHAT...Northwest winds 25 to 35 mph with gusts up to 55 mph 
  expected.

* WHERE...Portions of northwest Iowa, southwest Minnesota, and east 
  central South Dakota.

* WHEN...From 2 PM this afternoon to 10 PM CDT this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

$$

JM

486 
WWUS73 KFSD 211455
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
955 AM CDT Tue May 21 2024

SDZ062-067-212300-
/O.EXP.KFSD.HW.W.0002.000000T0000Z-240521T1500Z/
/O.CON.KFSD.WI.Y.0011.240521T1900Z-240522T0300Z/
Minnehaha-Lincoln-
Including the cities of Harrisburg, Lennox, Canton, Sioux Falls,
and Tea
955 AM CDT Tue May 21 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM 
CDT THIS EVENING...
...HIGH WIND WARNING WILL EXPIRE AT 10 AM CDT THIS MORNING...

* WHAT...Northwest winds 20 to 30 mph with gusts up to 50 mph 
  expected.

* WHERE...Lincoln and Minnehaha Counties.

* WHEN...From 2 PM this afternoon to 10 PM CDT this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

$$

SDZ059>061-064>066-068>071-211600-
/O.EXP.KFSD.HW.W.0002.000000T0000Z-240521T1500Z/
Davison-Hanson-McCook-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Clay-Union-
Including the cities of Centerville, Freeman, Tabor, Tripp,
Mitchell, Armour, Yankton, Delmont, Viborg, Scotland, Alcester,
Bridgewater, Alexandria, Beresford, Chancellor, Hurley, Avon,
Tyndall, North Sioux City, Springfield, Corsica, Clayton,
Parkston, Emery, Irene, Vermillion, Montrose, Parker, Jefferson,
Canistota, Menno, Salem, Marion, and Elk Point
955 AM CDT Tue May 21 2024

...HIGH WIND WARNING WILL EXPIRE AT 10 AM CDT THIS MORNING...

Stronger winds have been decreasing, so the Wind Warning will be 
allowed to expire.

$$

IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-SDZ039-040-055-
056-212300-
/O.CON.KFSD.WI.Y.0011.240521T1900Z-240522T0300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Lyon-Murray-
Cottonwood-Nobles-Jackson-Pipestone-Rock-Kingsbury-Brookings-Lake-
Moody-
Including the cities of Larchwood, Lake Benton, De Smet, Hartley,
Lakefield, Hendricks, Arlington, Orange City, Luverne, Orland,
Jackson, Rock Valley, Spirit Lake, Hawarden, Mountain Lake,
Milford, Windom, Hull, Sioux Center, Arnolds Park, Sibley,
Sanborn, Lake Preston, Madison, Flandreau, Spencer, Worthington,
Marshall, Brookings, Tyler, Inwood, Fulda, Slayton, Pipestone,
Rock Rapids, Sheldon, George, and Ivanhoe
955 AM CDT Tue May 21 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO 10 PM 
CDT THIS EVENING...

* WHAT...Northwest winds 25 to 35 mph with gusts up to 55 mph 
  expected.

* WHERE...Portions of northwest Iowa, southwest Minnesota, and east 
  central South Dakota.

* WHEN...From 2 PM this afternoon to 10 PM CDT this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. Tree 
  limbs could be blown down and a few power outages may result.

$$

JM

815 
WWUS73 KFSD 212140
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
440 PM CDT Tue May 21 2024

IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-SDZ039-040-
055-056-062-067-220300-
/O.CON.KFSD.WI.Y.0011.000000T0000Z-240522T0300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Murray-
Cottonwood-Nobles-Jackson-Pipestone-Rock-Kingsbury-Brookings-Lake-
Moody-Minnehaha-
Including the cities of Rock Rapids, George, Inwood, Larchwood, 
Sibley, Spirit Lake, Milford, Arnolds Park, Sioux Center, 
Orange City, Rock Valley, Hawarden, Hull, Sheldon, Hartley, 
Sanborn, Spencer, Tyler, Hendricks, Lake Benton, Ivanhoe, 
Marshall, Slayton, Fulda, Windom, Mountain Lake, Worthington, 
Jackson, Lakefield, Pipestone, Luverne, De Smet, Arlington, 
Lake Preston, Brookings, Madison, Orland, Flandreau, Sioux Falls,
Canton, Lennox, Tea, and Harrisburg
440 PM CDT Tue May 21 2024

...WIND ADVISORY REMAINS IN EFFECT FROM 2 PM THIS AFTERNOON TO
10 PM CDT THIS EVENING...

* WHAT...Northwest winds 25 to 35 mph with gusts up to 50 mph.

* WHERE...Portions of northwest Iowa, southwest Minnesota and 
  east central and southeast South Dakota.

* WHEN...Until 10 PM CDT this evening.

* IMPACTS...Gusty winds could blow around unsecured objects. 
  Tree limbs could be blown down and a few power outages may 
  result.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Use extra caution when driving, especially if operating a high
profile vehicle. Secure outdoor objects.

&&

$$

661 
WWUS73 KFSD 220247
NPWFSD

URGENT - WEATHER MESSAGE
National Weather Service Sioux Falls SD
947 PM CDT Tue May 21 2024

IAZ001>003-012>014-MNZ071-072-080-081-089-090-097-098-SDZ039-040-
055-056-062-067-220400-
/O.EXP.KFSD.WI.Y.0011.000000T0000Z-240522T0300Z/
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Lincoln-Murray-
Cottonwood-Nobles-Jackson-Pipestone-Rock-Kingsbury-Brookings-Lake-
Moody-Minnehaha-
Including the cities of Rock Rapids, George, Inwood, Larchwood, 
Sibley, Spirit Lake, Milford, Arnolds Park, Sioux Center, 
Orange City, Rock Valley, Hawarden, Hull, Sheldon, Hartley, 
Sanborn, Spencer, Tyler, Hendricks, Lake Benton, Ivanhoe, 
Marshall, Slayton, Fulda, Windom, Mountain Lake, Worthington, 
Jackson, Lakefield, Pipestone, Luverne, De Smet, Arlington, 
Lake Preston, Brookings, Madison, Orland, Flandreau, Sioux Falls,
Canton, Lennox, Tea, and Harrisburg
947 PM CDT Tue May 21 2024

...WIND ADVISORY WILL EXPIRE AT 10 PM CDT THIS EVENING...

Wind will continues to weaken through the overnight hours with
occasional gusts over 30 mph along the Buffalo ridge through 1am. 

$$

Area Forecast Discussion
National Weather Service Sioux Falls SD
1225 AM CDT Tue May 21 2024

.KEY MESSAGES...

- Isolated strong to severe storms remain possible this
  evening with threat increasing overnight.

- Latest WPC guidance has cut rainfall amounts for tonight
  through Tuesday. Even so, it will still be possible for areas
  to see 1 to 2 inches of rainfall through this period - with
  locally higher amounts possible in heavier storms.

- Isolated to scattered strong to severe storms remain possible
  overnight with the greatest threat from 3 AM to 9 AM Tuesday
  morning and again 12 PM to 6 PM Tuesday afternoon, mainly near
  and east of a Marshall to Sioux Falls to Yankton line. All
  threats are possible, though large hail up to ping pong ball
  size, isolated flash flooding, and damaging wind gusts up to
  70 mph are the main threats - though isolated tornadoes will
  be possible over northwestern IA on Tuesday afternoon.

&&

.UPDATE...
Issued at 909 PM CDT Mon May 20 2024

Several elevated supercells continue this evening within a
corridor of 1500-3000 J/KG. Now that 700:500 DPVA has arrived,
more widespread convection is developing across northern
Nebraska and western Iowa. Latest indications continue to point
to the reservoir of meaningful instability extending along a
line from Vermillion to just southeast of Sioux Falls to Windom,
MN with the highest MUCAPE AOA 2200 J/KG across the Spencer and
Storm Lake areas. We've continued to see an increase in
effective shear this evening with upwards of 55 knots promoting
very large 3" hail in a few locations. Fully expect elevated
supercells to continue for the next 2-4 hours as instability
should hold strong, especially along a Sioux City to Spencer
line and strong forcing from approaching 500 mb wave moves
through. Golf-ball size hail will be possible in anything that
rotates tonight.

An additional concern tonight is with potential for convection
across southwest Nebraska/Kansas to grow upscale into a linear
bowing line. Much of the 00Z guidance is now pushing a large MCS
towards the Sioux City area after 10Z, with CAMs suggesting a
damaging wind threat in a loosely stable environment. Also
concerning is the potential increase in 0-1KM CAPE and given
orientation to the low level flow, could not rule out some
potential QLCS spinups. This threat would be mainly confined to
the Highway 20 corridor.

One other thing to watch for is wake low potential. The HRRR,
which can often pick up these developments, is suggesting high
wind potential along and west of I-29 through mid-morning.

 &&

.DISCUSSION...
Issued at 320 PM CDT Mon May 20 2024

Current radar this afternoon indicates very light showers oriented
from south central SD into northeastern SD - this associated with
mid level frontogenesis and lift provided by an upper level jet
residing through northwestern SD and ND. In any event, little
precipitation is expected with this band with dry air residing below
about 700 mb. Otherwise, our attention turns to the convection
potential overnight into Tuesday. Latest hi-res models indicate
isolated to scattered showers and thunderstorms developing early
this evening (some time after 22Z), with the earlier development
occurring over through east central SD and southwestern MN as warm
air advection begin to increase out ahead of shortwave lifting into
western NE. Latest guidance would suggest MUCAPE of 1500 J/KG from
the Interstate 29 corridor in the the evening, though with
relatively weak mid/upper level winds, effective shear is on the
lower side at 30-35 kts. Even so, there will be some potential for a
stronger to severe storm through late evening with hail to the size
of ping pong balls and winds to 60 mph. There may be somewhat of a
break in convection for the early night time hours, before
invigoration late in the night as an upper level shortwave begins to
lift through NE while a surface low deepens over northern KS and
southern NE. With increasing midlevel warm air advection, showers and
thunderstorm coverage will increase after 06Z - most notably in the
lower MO River Valley into northwestern IA after 09Z as a low level
jet strengthens over eastern NE into that area. The better elevated
instability at that point will reside over northwest IA, and with
increasing effective shear as winds aloft increase, there will again
be the potential for isolated severe storms. With that will come an
increasing chance of heavy rainfall as PW values over that area climb
to 1.5" plus, with some locales receiving an inch or two in heavier
storms (see hydro section below).

CAMs would suggest a possible break in the shower and thunderstorm
activity by mid to late Tuesday morning, before additional
thunderstorms develop on Tuesday afternoon - centered on the lower
MO River Valley and northwestern IA as the upper level low tracks
directly over our area and the surface low pushes through the
eastern half of our CWA. If morning convection does not have an
impact on later day storms, afternoon CAPE will average 1500 J/kg +
in the warm sector, with 0-6 km bulk shear, so there will be a good
chance of at least a few severe storms. While large hail and
damaging winds will again be threats, there will also be a higher
risk of tornadoes in our far east in the presence of the surface
low. In addition to the convective potential, it will be a windy day
with the tight surface pressure gradient in place - and it will be
possible that winds approach advisory criteria in some locales.
There will be a quite a temperature gradient across the area on
Tuesday, with highs only in the 50s in our western CWA, to upper
60s/lower 70s over northwestern IA. Latest models indicate that
shower and thunderstorm activity will exit our CWA close to 00Z on
Tuesday evening. Tuesday night will see clearing skies and cooler
temperatures with lows in the 40s.

Less active weather over our area for midweek as the upper
level/surface low lift into east central Canada on Wednesday and
Thursday. After a brief cool down on Wednesday (upper 60s to lower
70s), temperatures warm back into the mid and upper 70s for
Thursday. Our next best chance of showers and storms will come on
Thursday night into Friday as another upper level/surface low track
into the Northern Plains. Latest ensembles would indicate moderate
probabilities (40-60%) of receiving a quarter of an inch of rain
with this system, and lower probs (30-40%) of receiving a half an
inch. Models then trend toward a drier period into next weekend,
with temperatures falling back closer to normal.

&&

.AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/...
Issued at 1220 AM CDT Tue May 21 2024

Convection will continue to spread northward overnight, bringing
period of moderate to heavy rain. Towards daybreak, it's likely
that we'll see MVFR or lower ceilings set into the area ahead of
an approaching upper low.

Strong convection may move northeast out of Nebraska towards
10-12Z bringing a risk for strong winds into northwest Iowa.
Further northwest into eastern South Dakota, strong wake low
winds may develop.

Additional showers and potentially convection will be possible
after noon, as MVFR to IFR ceilings continue across South Dakota
into the early afternoon. The passage of a surface low through
Sioux Falls and then western Minnesota will bring an end to the
rain, but also the potential for 35 to 40 knots of northwest
wind into the evening.

&&

.HYDROLOGY...
Issued at 320 PM CDT Mon May 20 2024

A couple of different rounds of rainfall will spark some hydrology
concerns over the next 36 hours. The first of which will come
tonight on the convergence of the 850mb LLJ. This could result in a
west to east area of training thunderstorms with overall system
propagation Corfidi vectors dropping near or below 10 kts. At the
same time, PWATs AOA 1.5 inches and warm cloud layers AOA 10 kft
should drive efficient rainfall rates. Should any of this more
robust rainfall occur over urban or more flood prone areas, flash
flooding could result.

The next round of rain will approach quickly by midday as the main
vort lobe ejects. While this activity should be more progressive,
parameters are still favorable for efficient rain rates near or
above 1 inch per hour, some of which will be falling on already
saturated soil from tonight's activity.

From a river perspective, HEFS guidance may be suffering from a low
QPF bias compared to that of WPC and other deterministic values
(such as HREF PMM/LPMM) and thus its hydrologic response may also be
too muted. Utilizing a mix of expected and high-end (95th
percentile) WPC QPF would suggest rises near or into flood stage
along portions of the Little Sioux, Ocheyedan and perhaps lower Big
Sioux and Redwood. Even some smaller potential of flooding on other
basins.

With all of the above in mind, and factoring in the preexisting
saturated conditions from early month flooding in NW IA, have issued
a Flood Watch for a handful of Iowa counties.

&&

.FSD WATCHES/WARNINGS/ADVISORIES...
SD...None.
MN...Flood Watch through this evening for MNZ081-090.
IA...Flood Watch through this evening for IAZ003-013-014-021-022-
     031-032.
NE...Flood Watch through this evening for NEZ014.

&&

UPDATE...Dux
DISCUSSION...JM
AVIATION...Dux
HYDROLOGY...Kalin

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
447 PM CDT Mon May 20 2024

SDZ038>040-050-052>055-057>061-063>065-068-212200-
Beadle-Kingsbury-Brookings-Gregory-Jerauld-Sanborn-Miner-Lake-
Brule-Aurora-Davison-Hanson-McCook-Charles Mix-Douglas-Hutchinson-
Bon Homme-
447 PM CDT Mon May 20 2024

This Hazardous Weather Outlook is for portions of central South
Dakota, east central South Dakota, south central South Dakota,
and southeast South Dakota.

.DAY ONE...Tonight

Isolated showers are possible this morning.

Widespread showers and storms will spread in from the southwest after
midnight tonight. Isolated severe storms are possible tonight with
the greatest threat 3 AM to 7 AM. Large hail up to quarter size and
heavy downpours are the main hazards with the strongest storms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Showers and isolated storms will continue through the day Tuesday,
but severe weather is unlikely. By Tuesday night, a widespread 1 to 2
inches of rain is expected.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated tonight or Tuesday for
severe storms. However heavy rainfall reports are requested.

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ056-062-066-067-069>071-212200-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Moody-Minnehaha-Turner-Yankton-Union-
447 PM CDT Mon May 20 2024

This Hazardous Weather Outlook is for portions of northwest Iowa,
west central Iowa, southwest Minnesota, northeast Nebraska, east
central South Dakota, and southeast South Dakota.

.DAY ONE...Tonight

Isolated to scattered thunderstorms will be possible this evening
across portions of southern Minnesota and northwest Iowa. The
primary risks will be hail up to half dollar size and pockets of
60 mph winds.

Isolated to scattered thunderstorms may continue into the
overnight hours with a continued risk for a few strong storms.
However, more widespread thunderstorm activity will develop
between 3 AM to 9 AM Tuesday morning as storms arrive from the
southwest. Large hail up to ping pong ball size, damaging wind
gusts up to 70 mph, and flash flooding will be the main threats.
While a very low chance, a tornado or two cannot be ruled out
especially in areas along and south of Highway 20.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Another round of strong to severe thunderstorms may redevelop Tuesday
afternoon from 12 PM to 6 PM. Large hail up to ping pong ball size,
damaging wind gusts up to 70 mph, and flash flooding will be the main
threats. A tornado or two cannot be ruled out especially in areas
along and southeast of a line from Sioux City to Spencer. By
Tuesday night, expect a widespread 1 to 2 inches of rain with some
locations receiving over 3 inches.

Renewed flooding on rivers such as the Little Sioux and Ocheyedan
will be likely.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening in northwestern Iowa
and southern Minnesota, and in all areas southwest of a Yankton to
Windom line early Tuesday morning through Tuesday afternoon.

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1010 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0952 PM     Hail             8 NE Meckling           42.91N 96.95W
05/20/2024  E1.00 Inch       Clay               SD   Trained Spotter

            Lots of nickel to quarter sized hail.

&&

BP

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1040 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1030 PM     Hail             Newcastle               42.65N 96.88W
05/20/2024  E1.75 Inch       Dixon              NE   Trained Spotter

            Lots of quarter to golf ball sized hail.
            Ground covered in hail.

&&

BP

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1054 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1042 PM     Tstm Wnd Gst     1 W Sergeant Bluff      42.40N 96.38W
05/20/2024  M72 MPH          Woodbury           IA   ASOS

&&

Dux

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1100 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1059 PM     Hail             Elk Point               42.69N 96.68W
05/20/2024  E1.75 Inch       Union              SD   Emergency Mngr

            Quarter to golf ball sized hail, strong wind
            gusts, and heavy rain at the Sheriffs
            Office.

&&

BP

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1124 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 PM     Hail             Royal                   43.07N 95.28W
05/20/2024  M2.00 Inch       Clay               IA   Public

            Social media report with pictures and tape
            measure for reference.

&&

AJP

Preliminary Local Storm Report
National Weather Service Sioux Falls SD
1146 PM CDT Mon May 20 2024

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1042 PM     Tstm Wnd Dmg     Sergeant Bluff          42.40N 96.36W
05/20/2024                   Woodbury           IA   Emergency Mngr

            Lots of trees down, some siding damage, and
            power lines down around Sergeant Bluff. Time
            estimated via radar.

1042 PM     Hail             Sergeant Bluff          42.40N 96.36W
05/20/2024  E1.25 Inch       Woodbury           IA   Broadcast Media

            Viewer reports of half dollar or slightly
            larger hail in Sergeant Bluff area. Ground
            covered in hail. Time estimated via radar.

&&