Severe Thunderstorm Warning 96, NWS Sioux Falls, SD

096 
WWUS53 KFSD 030704
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
204 AM CDT Fri Jul 3 2020

SDC009-023-043-053-067-030730-
/O.CON.KFSD.SV.W.0096.000000T0000Z-200703T0730Z/
Charles Mix SD-Gregory SD-Bon Homme SD-Douglas SD-Hutchinson SD-
204 AM CDT Fri Jul 3 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 AM CDT
FOR SOUTHEASTERN CHARLES MIX...SOUTHEASTERN GREGORY...BON HOMME...
EASTERN DOUGLAS AND HUTCHINSON COUNTIES...

At 203 AM CDT, severe thunderstorms were located along a line
extending from near Freeman to near Scotland to 9 miles south of
Avon, moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Ground observation stations.

IMPACT...Expect damage to roofs, siding, and trees.

These severe thunderstorms will remain over mainly rural areas of
southeastern Charles Mix, southeastern Gregory, Bon Homme, eastern
Douglas and Hutchinson Counties, including the following locations...
Olivet.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4284 9815 4293 9844 4300 9850 4300 9880
      4331 9839 4350 9820 4350 9741 4317 9750
      4317 9764 4297 9764 4285 9776 4286 9787
      4280 9790 4277 9795 4277 9806
TIME...MOT...LOC 0703Z 291DEG 45KT 4328 9742 4312 9767 4288 9813 

HAIL...<.75IN
WIND...60MPH
 
$$

Kalin

792 
WWUS53 KFSD 030729
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
229 AM CDT Fri Jul 3 2020

SDC009-023-043-053-067-030737-
/O.EXP.KFSD.SV.W.0096.000000T0000Z-200703T0730Z/
Charles Mix SD-Gregory SD-Bon Homme SD-Douglas SD-Hutchinson SD-
229 AM CDT Fri Jul 3 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHARLES MIX...
SOUTHEASTERN GREGORY...BON HOMME...EASTERN DOUGLAS AND HUTCHINSON
COUNTIES WILL EXPIRE AT 230 AM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

LAT...LON 4284 9815 4293 9844 4300 9850 4300 9880
      4331 9839 4350 9820 4350 9741 4317 9750
      4317 9764 4297 9764 4285 9776 4286 9787
      4280 9790 4277 9795 4277 9806
TIME...MOT...LOC 0727Z 291DEG 45KT 4318 9706 4302 9731 4278 9777 

$$

Kalin

AREA FORECAST DISCUSSION...UPDATED
National Weather Service Sioux Falls SD
1011 PM CDT Thu Jul 2 2020

.UPDATE...
Issued at 952 PM CDT Thu Jul 2 2020

A line of strong storms progressing through central SD will
approach areas along and west of the SD Missouri River Valley in
the next few hours. This line is expected to gradually continue to
weaken as it approaches the weaker deep layer shear further east.
However it may still pose isolated threat of large hail or
damaging wind gusts to areas south of a Wessington Springs to
Mitchell line, where southernmost cells in the line are supported
by the developing low level jet, steeper mid level lapse rates,
and untapped instability.

&&

.SHORT TERM...(This Evening through Friday)
Issued at 254 PM CDT Thu Jul 2 2020

02.19Z water vapor shows a weak short-wave moving into the western
Dakotas within southwest flow aloft. This will be the primary
focus for showers and thunderstorms this afternoon and evening. If
any one cluster of thunderstorms becomes cold-pool dominant, it
could move into areas west of the James River after 00Z tonight.
That said, weak shear and lack of forcing preclude any strong to
severe thunderstorms in the local area. Otherwise, expect thermal
cumulus to dissipate through the evening with mostly clear skies
overnight. Lows will range from the mid 60s to near 70 degrees.

For Friday, a 500 hPa short-wave ridge builds across the region,
resulting in broad albeit weak subsidence. This, combined with a
strong thermal cap around 800 hPa should squash convective chances
for most of the day. That said, will continue to carry 20-30 POPs
across the western forecast area late in the afternoon into the
evening to cover any potential bleed over from convection across
West River. Highs tomorrow will range form the upper 70s to near
80 degrees. Given dewpoints near 70 degrees, expect another muggy
day.

.LONG TERM...(Friday Night through Thursday)
Issued at 254 PM CDT Thu Jul 2 2020

Aforementioned 500 hPa ridge flattens a bit on Saturday with the
02.12Z model suite hinting at a couple weak short-waves riding the
ridge mainly across North Dakota. Think most convection will stay
tied to these features, although cannot completely rule out some
scattered showers and storms farther south. Will carry 20-30 POPs
Saturday afternoon/evening for now, but expect mostly dry
conditions for 4th of July festivities. Given the potential for
slightly better forcing Saturday, any storms that do develop
could be strong as highlighted in the Day 3 SPC Outlook (marginal
risk). Bigger threat Saturday will be continued heat and humidity
with afternoon heat index values well into the 90s for most
locations.

Ridge continues to flatten Sunday through much of next week as
stronger, more persistent troughing progresses across the northern
tier states. Several short-waves look to traverse the Dakotas, but
timing/strength differences abound between medium-range models. As
a result, chance POPs (30-50%) seem reasonable for much of the
long term at this time. Still no strong signals to suggest a
change in air mass, so seasonably warm/humid conditions look to
continue with daily highs from the upper 80s to lower 90s.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
Issued at 952 PM CDT Thu Jul 2 2020

A line of storms in central SD will progress slowly eastward late this
evening, tracking near KHON and K9V9 around 05z and spreading
anvil cirrus across much of the rest of the region. Storms will
bring erratic gusty winds and MVFR ceilings/vsby, continuing to
weaken and eventually dissipate as they progress eastward
overnight.

Other than with storms, VFR conditions are expected to prevail
through the TAF period. Southeast winds will weaken diurnally
around dusk and strengthen slightly to near 10 kts Friday morning.

&&

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

UPDATE...BP
SHORT TERM...Rogers
LONG TERM...Rogers
AVIATION...BP

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
456 AM CDT Thu Jul 2 2020

IAZ001>003-012>014-020>022-031-032-MNZ071-072-080-081-089-090-097-
098-NEZ013-014-SDZ038>040-050-052>071-031000-
Lyon-Osceola-Dickinson-Sioux-O'Brien-Clay-Plymouth-Cherokee-
Buena Vista-Woodbury-Ida-Lincoln-Murray-Cottonwood-Nobles-Jackson-
Pipestone-Rock-Dixon-Dakota-Beadle-Kingsbury-Brookings-Gregory-
Jerauld-Sanborn-Miner-Lake-Moody-Brule-Aurora-Davison-Hanson-McCook-
Minnehaha-Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
Union-
456 AM CDT Thu Jul 2 2020

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

.DAY ONE...Today and tonight.

Heat index values this afternoon in the 90s will increase the
potential for heat related illness. Those spending time outdoors will
need to take precautions, such as staying hydrated and taking more
frequent breaks.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

Afternoon heat indices remain in the 90s Friday through the holiday
weekend, increasing the potential for heat related illnesses. Be
sure to drink plenty of fluids and take frequent breaks if working
outside.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1244 AM CDT FRI JUL 3 2020

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

1205 AM     TSTM WND GST     HURON                   44.37N 98.21W
07/03/2020  M62 MPH          BEADLE             SD   ASOS

&&

Special Weather Statement
National Weather Service Sioux Falls SD
108 AM CDT Fri Jul 3 2020

SDZ038-050-052-053-057>059-063-064-030815-
Beadle-Gregory-Jerauld-Sanborn-Brule-Aurora-Davison-Charles Mix-
Douglas-
Including the cities of Huron, Gregory, Burke,
Wessington Springs, Alpena, Woonsocket, Chamberlain, Kimball,
Plankinton, White Lake, Stickney, Mitchell, Wagner, Platte,
Lake Andes, Marty, Armour, Corsica, and Delmont
108 AM CDT Fri Jul 3 2020

Strong gusty winds may occur behind a line of thunderstorms moving
across the area. Wind gusts of 45 to 55 with localized higher
gusts will be possible for the next couple of hours. Use caution
if driving a high profile vehicle and secure loose objects.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
109 AM CDT FRI JUL 3 2020

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

0105 AM     TSTM WND GST     3 N MITCHELL            43.77N 98.04W
07/03/2020  M62 MPH          DAVISON            SD   PUBLIC

&&