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Severe Thunderstorm Warning


Severe Weather Statement
National Weather Service Sioux Falls SD
1208 PM CDT MON AUG 21 2017

SDC003-023-035-043-053-067-211745-
/O.CON.KFSD.SV.W.0230.000000T0000Z-170821T1745Z/
Davison SD-Aurora SD-Charles Mix SD-Gregory SD-Douglas SD-
Hutchinson SD-
1208 PM CDT MON AUG 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT
FOR SOUTHERN DAVISON...SOUTHERN AURORA...EASTERN CHARLES MIX...
SOUTHEASTERN GREGORY...DOUGLAS AND WESTERN HUTCHINSON COUNTIES...

At 1207 PM CDT, severe thunderstorms were located along a line
extending from near Stickney to 6 miles west of Armour to 10 miles
east of Bonesteel, moving east at 40 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Public. At 12:05 PM CDT, golf ball size hail was reported
         2 miles south of Aurora Center.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect
         considerable tree damage. Wind damage is also likely to
         mobile homes, roofs, and outbuildings.

These severe storms will be near...
  Armour around 1215 PM CDT.
  Pickstown around 1225 PM CDT.
  Delmont around 1230 PM CDT.
  Marty around 1235 PM CDT.
  Dimock around 1240 PM CDT.
  Parkston, Tripp and Dante around 1245 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4339 9865 4359 9870 4360 9814 4352 9797
      4350 9796 4349 9789 4322 9795 4317 9801
      4317 9808 4308 9811 4292 9828 4299 9850
      4300 9850 4310 9893
TIME...MOT...LOC 1707Z 292DEG 36KT 4351 9845 4333 9847 4309 9875

HAIL...2.00IN
WIND...70MPH

$$

Schumacher

Severe Weather Statement
National Weather Service Sioux Falls SD
1152 AM CDT MON AUG 21 2017

SDC003-015-023-043-053-211715-
/O.CON.KFSD.SV.W.0229.000000T0000Z-170821T1715Z/
Aurora SD-Charles Mix SD-Gregory SD-Douglas SD-Brule SD-
1152 AM CDT MON AUG 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 PM CDT
FOR SOUTHWESTERN AURORA...NORTHWESTERN CHARLES MIX...SOUTHERN
GREGORY...NORTHERN DOUGLAS AND SOUTHEASTERN BRULE COUNTIES...

At 1151 AM CDT, severe thunderstorms were located along a line
extending from near Aurora Center to 7 miles north of Bonesteel,
moving east at 40 mph.

These are very dangerous storms.

HAZARD...Three inch hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be severely injured.
         Expect shattered windows, extensive damage to roofs,
         siding, and vehicles.

These severe storms will be near...
  New Holland and Aurora Center around 1200 PM CDT.
  Harrison around 1205 PM CDT.
  Geddes around 1210 PM CDT.
  Corsica around 1215 PM CDT.

Other locations impacted by these severe thunderstorms include
Fairfax.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

These are dangerous storms. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.

&&

LAT...LON 4344 9822 4300 9871 4300 9902 4315 9931
      4362 9891
TIME...MOT...LOC 1651Z 280DEG 35KT 4350 9868 4318 9900

HAIL...3.00IN
WIND...70MPH

$$

Schumacher


Flash Flood Warning


Flash Flood Warning
SDC065-085-117-211815-
/O.NEW.KABR.FF.W.0002.170821T1511Z-170821T1815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Aberdeen SD
1011 AM CDT MON AUG 21 2017

The National Weather Service in Aberdeen has issued a

* Flash Flood Warning for...
  Southeastern Stanley County in central South Dakota...
  Central Hughes County in central South Dakota...
  North central Lyman County in central South Dakota...

* Until 115 PM CDT/1215 PM MDT/

* At 1009 AM CDT/909 AM MDT/, Doppler radar indicated heavy rain
  across the warned area. One to 2 inches of rain have fallen. Flash
  flooding is already occurring.

* Some locations that will experience flooding include...
  Pierre, Fort Pierre, Joe Creek Rec Area, Cedar Creek Rec Area and
  Lake Sharpe.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 4419 9976 4409 9982 4432 10042 4442 10037

$$

Mohr


Severe Weather Statement


Severe Weather Statement
National Weather Service Sioux Falls SD
1208 PM CDT MON AUG 21 2017

SDC003-023-035-043-053-067-211745-
/O.CON.KFSD.SV.W.0230.000000T0000Z-170821T1745Z/
Davison SD-Aurora SD-Charles Mix SD-Gregory SD-Douglas SD-
Hutchinson SD-
1208 PM CDT MON AUG 21 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT
FOR SOUTHERN DAVISON...SOUTHERN AURORA...EASTERN CHARLES MIX...
SOUTHEASTERN GREGORY...DOUGLAS AND WESTERN HUTCHINSON COUNTIES...

At 1207 PM CDT, severe thunderstorms were located along a line
extending from near Stickney to 6 miles west of Armour to 10 miles
east of Bonesteel, moving east at 40 mph.

HAZARD...Two inch hail and 70 mph wind gusts.

SOURCE...Public. At 12:05 PM CDT, golf ball size hail was reported
         2 miles south of Aurora Center.

IMPACT...People and animals outdoors will be injured. Expect hail
         damage to roofs, siding, windows, and vehicles. Expect
         considerable tree damage. Wind damage is also likely to
         mobile homes, roofs, and outbuildings.

These severe storms will be near...
  Armour around 1215 PM CDT.
  Pickstown around 1225 PM CDT.
  Delmont around 1230 PM CDT.
  Marty around 1235 PM CDT.
  Dimock around 1240 PM CDT.
  Parkston, Tripp and Dante around 1245 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4339 9865 4359 9870 4360 9814 4352 9797
      4350 9796 4349 9789 4322 9795 4317 9801
      4317 9808 4308 9811 4292 9828 4299 9850
      4300 9850 4310 9893
TIME...MOT...LOC 1707Z 292DEG 36KT 4351 9845 4333 9847 4309 9875

HAIL...2.00IN
WIND...70MPH

$$

Schumacher


Severe Thunderstorm Watch


WATCH COUNTY NOTIFICATION FOR WATCHES 459/460
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1134 AM CDT MON AUG 21 2017

SDC003-015-023-035-043-053-073-111-211900-
/O.CON.KFSD.SV.A.0459.000000T0000Z-170821T1900Z/

SEVERE THUNDERSTORM WATCH 459 REMAINS VALID UNTIL 2 PM CDT THIS
AFTERNOON FOR THE FOLLOWING AREAS

IN SOUTH DAKOTA THIS WATCH INCLUDES 8 COUNTIES

IN CENTRAL SOUTH DAKOTA

JERAULD

IN EAST CENTRAL SOUTH DAKOTA

SANBORN

IN SOUTH CENTRAL SOUTH DAKOTA

AURORA                BRULE                 CHARLES MIX
DOUGLAS               GREGORY

IN SOUTHEAST SOUTH DAKOTA

DAVISON

$$

WATCH COUNTY NOTIFICATION FOR WATCH 459
NATIONAL WEATHER SERVICE RAPID CITY SD
1033 AM MDT MON AUG 21 2017

SDC123-211900-
/O.CON.KUNR.SV.A.0459.000000T0000Z-170821T1900Z/

SEVERE THUNDERSTORM WATCH 459 REMAINS VALID UNTIL 2 PM CDT THIS
AFTERNOON FOR THE FOLLOWING AREAS

IN SOUTH DAKOTA THIS WATCH INCLUDES 1 COUNTY

IN SOUTH CENTRAL SOUTH DAKOTA

TRIPP

THIS INCLUDES THE CITIES OF CLEARFIELD, IDEAL, AND WINNER.

$$

SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 460
NWS STORM PREDICTION CENTER NORMAN OK
1135 AM CDT MON AUG 21 2017

SEVERE THUNDERSTORM WATCH 460 IS IN EFFECT UNTIL 700 PM CDT
FOR THE FOLLOWING LOCATIONS

NEC003-015-021-027-039-043-051-089-103-107-119-139-149-167-173-
179-220000-
/O.NEW.KWNS.SV.A.0460.170821T1635Z-170822T0000Z/

NE
.    NEBRASKA COUNTIES INCLUDED ARE

ANTELOPE             BOYD                BURT
CEDAR                CUMING              DAKOTA
DIXON                HOLT                KEYA PAHA
KNOX                 MADISON             PIERCE
ROCK                 STANTON             THURSTON
WAYNE
$$


Special Weather Statement


Special Weather Statement
National Weather Service Riverton WY
1233 AM MDT Mon Aug 21 2017

WYZ008>011-020-022-212200-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Natrona County Lower Elevations-Casper Mountain-
Including the cities of Buffalo, Kaycee, and Casper
1233 AM MDT Mon Aug 21 2017

...Elevated Fire Conditions Continue Today...

Elevated fire weather conditions can be expected for all of
central and northern Wyoming today as relative humidity drops
into the mid and upper teens across the lower elevations and the
upper teens to around 35 percent in the mountains. Winds will be
north to northeast 10 to 15 mph with occasional afternoon gusts
20 to 25 mph across Natrona County...and northeast 5 to 15 mph
with occasional gusts to 20 mph over Johnson County. Residents,
travellers, and campers this weekend are encouraged to take strong
caution if considering any type of burning activities. Please
follow local burning rules. In addition, In addition, do not drive
off the area roadways as dry vegetation could easily catch on
fire.

$$


Hazardous Weather Outlook


Hazardous Weather Outlook
National Weather Service North Platte NE
1144 AM CDT Mon Aug 21 2017

NEZ004>010-022>029-035>038-056>059-069>071-094-221645-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-
Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-
Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
1144 AM CDT Mon Aug 21 2017 /1044 AM MDT Mon Aug 21 2017/

This Hazardous Weather Outlook is for portions of western and
north central Nebraska.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

A cool front will move across western Nebraska through this
evening that will be the focus for a few severe thunderstorms.
The area of concern is to the east of a line from Valentine to
Ogallala. The main threat will be large hail and damaging winds.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.

Thursday through Saturday thunderstorms appear possible across
portions of the outlook area, mainly in the afternoon and
evening.However, the risk for severe thunderstorms is low at this
time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed through this evening.

&&
Get your latest weather, hydrological, and climate information
at http://www.weather.gov/northplatte

$$

Keck

Hazardous Weather Outlook
National Weather Service Cheyenne WY
815 AM MDT Mon Aug 21 2017

NEZ002-003-019>021-054-055-095-096-221415-
Dawes-Box Butte-Scotts Bluff-Banner-Morrill-Kimball-Cheyenne-
North Sioux-South Sioux-
815 AM MDT Mon Aug 21 2017

This hazardous weather outlook is for portions of western
Nebraska.

.DAY ONE...TODAY AND TONIGHT

Areas of fog, locally dense along the North Platte Valley, will
linger until later this morning. Visibilties will range from as
low as a half mile along the North Platte Valley to five miles.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

Chances of thunderstorms will return to the region by the middle
of the week.  Severe storms are not expected.

.Spotter information statement...

Spotter activation will not be needed.

$$

Hazardous Weather Outlook
National Weather Service Sioux Falls SD
529 AM CDT Mon Aug 21 2017

MNZ071-072-080-081-097-098-SDZ040-050-054>056-058>066-068-069-
221030-
Lincoln MN-Lyon MN-Murray-Cottonwood-Pipestone-Rock-Brookings-
Gregory-Miner-Lake-Moody-Aurora-Davison-Hanson-McCook-Minnehaha-
Charles Mix-Douglas-Hutchinson-Turner-Bon Homme-Yankton-
529 AM CDT Mon Aug 21 2017

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

.DAY ONE...Today and Tonight

Scattered thunderstorms are expected to develop across the area
during the early to mid afternoon, moving out of the area by early
evening. Severe storms are possible, with hail to golf ball size
and winds to 65 mph the primary threat.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be possible between 1 pm and 7 pm.

$$

Hazardous Weather Outlook
National Weather Service Aberdeen SD
458 AM CDT Mon Aug 21 2017

MNZ039-046-SDZ003>011-015>023-033>037-045-048-051-221000-
Traverse-Big Stone-Corson-Campbell-McPherson-Brown-Marshall-
Roberts-Walworth-Edmunds-Day-Dewey-Potter-Faulk-Spink-Clark-
Codington-Grant-Hamlin-Deuel-Stanley-Sully-Hughes-Hyde-Hand-Jones-
Lyman-Buffalo-
458 AM CDT Mon Aug 21 2017 /358 AM MDT Mon Aug 21 2017/

This Hazardous Weather Outlook is for portions of west central
Minnesota, central South Dakota, north central South Dakota, and
northeast South Dakota.

.DAY ONE...Today and Tonight

An area of showers and thunderstorms early this morning over
central South Dakota with push east through late morning. A few
storms could be strong to severe, with large hail possible.
Otherwise, additional thunderstorm development is possible today,
but the overall areal coverage is expected to diminish, with only
a low threat for severe storms.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

$$
TMT

Hazardous Weather Outlook
National Weather Service Rapid City SD
309 AM MDT Mon Aug 21 2017

SDZ002-013-014-031-032-042>044-046-047-049-073-221300-
Perkins-Northern Meade Co Plains-Ziebach-Pennington Co Plains-
Haakon-Oglala Lakota-Jackson-Bennett-Mellette-Todd-Tripp-
Southern Meade Co Plains-
309 AM MDT Mon Aug 21 2017 /409 AM CDT Mon Aug 21 2017/

This Hazardous weather outlook is for portions of south central
South Dakota...and western South Dakota.

.DAY ONE...TODAY AND TONIGHT

Scattered thunderstorms will move across the area today, mainly
this morning. Severe thunderstorms are not expected at this time.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

&&

Stay tuned to NOAA weather radio for further updates...or check
our web site at weather.gov/rapidcity

$$

Hazardous Weather Outlook
National Weather Service Riverton WY
254 AM MDT Mon Aug 21 2017

WYZ001>020-022>030-221100-
Yellowstone National Park-Absaroka Mountains-Cody Foothills-
North Big Horn Basin-Southwest Big Horn Basin-
Southeast Big Horn Basin-Owl Creek and Bridger Mountains-
Bighorn Mountains West-Bighorn Mountains Southeast-
Northeast Johnson County-Southeast Johnson County-
Teton and Gros Ventre Mountains-Jackson Hole-
Wind River Mountains West-Wind River Mountains East-
Upper Wind River Basin-Wind River Basin-Lander Foothills-
Green Mountains and Rattlesnake Range-
Natrona County Lower Elevations-Casper Mountain-Star Valley-
Salt River and Wyoming Ranges-Upper Green River Basin Foothills-
Upper Green River Basin-South Lincoln County-
Rock Springs and Green River-Flaming Gorge-East Sweetwater County-
254 AM MDT Mon Aug 21 2017

This Hazardous Weather Outlook is for Western and Central Wyoming.

.DAY ONE...Today and Tonight

Elevated fire weather conditions today due to very dry conditions
across Wyoming.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Tuesday...Isolated gusty thunderstorms across the south and southwest.

Wednesday through Friday...Isolated to widely scattered
afternoon and evening thunderstorms. Some stronger thunderstorms
possible across the north on Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today and tonight.

$$


Short Term Forecast


Short Term Forecast
National Weather Service North Platte NE
1138 AM CDT Mon Aug 21 2017

NEZ006-007-009-010-211745-
Keya Paha-Boyd-Rock-Holt-
Including the cities of Springview, Spencer, Butte, Lynch,
Bassett, Rose, Oneill, and Atkinson
1138 AM CDT Mon Aug 21 2017

.NOW...
...Severe Thunderstorm Watch in Effect Until 7 PM CDT...
Scattered thunderstorms will approach northern Keya Paha and Boyd
counties through 1240 pm CDT. The storms while moving east
southeast at 35 t0 40 mph should clip areas north of Highway 12,
although additional development further south cannot be ruled out.
The primary threats will be large hail and damaging winds with
storms that further intensify while moving southeast.

$$

Keck

U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: June 2, 2009
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