Pilot Index / South Dakota / Aug 21, 2017

Preliminary

Storms in South Dakota on Aug 21, 2017

26 published severe reports across South Dakota on Aug 21, 2017.

Updated Oct 28, 2026.

Coverage is partial. 473 source scopes are pending. Pending data is not a zero report count.

Hail reports: 19. Wind reports: 7. Tornado reports: 0.

The table and map show 26 of 26 reports.

TimeWhatSize or SpeedWhereDetails
Aug 21, 2017, 4:00 AM MDTHail2.25 in8 S DUPREE
Record
  • Aug 21, 2017, 4:00 AM MDT. Hail, 2.25 in, 8 S DUPREE. Source: NWS Local Storm Reports. Status: Preliminary. Record id: lsr:45f37c974e94876fec30a567388d0b7cdfd83b5c65cd9678ec401ff9caed7892.
Aug 21, 2017, 4:00 AM MDTHail1.75 in8 S DUPREE
Record
  • Aug 21, 2017, 4:00 AM MDT. Hail, 1.75 in, 8 S DUPREE. Source: NWS Local Storm Reports. Status: Preliminary. Record id: lsr:e377669e640d7d598892c85e30db6f6f8cc6ac0e9a22f0bb8e915d9b21173cf6.
Aug 21, 2017, 4:00 AM MDTHail1.75 inDUPREE
Record
  • Aug 21, 2017, 4:00 AM MDT. Hail, 1.75 in, DUPREE. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:708420.
Aug 21, 2017, 4:00 AM MDTHail2.25 inDUPREE
Record
  • Aug 21, 2017, 4:00 AM MDT. Hail, 2.25 in, DUPREE. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:708428.
Aug 21, 2017, 5:45 AM CDTHail1.75 inTHATCHER
Record
  • Aug 21, 2017, 5:45 AM CDT. Hail, 1.75 in, THATCHER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720172.
Aug 21, 2017, 6:36 AM CDTHail1.00 inGALLAGHER
Record
  • Aug 21, 2017, 6:36 AM CDT. Hail, 1.00 in, GALLAGHER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720173.
Aug 21, 2017, 6:40 AM CDTHail1.00 inGALLAGHER
Record
  • Aug 21, 2017, 6:40 AM CDT. Hail, 1.00 in, GALLAGHER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720174.
Aug 21, 2017, 7:38 AM CDTHail1.75 in(ATY)WATERTOWN ARPT
Record
  • Aug 21, 2017, 7:38 AM CDT. Hail, 1.75 in, (ATY)WATERTOWN ARPT. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720175.
Aug 21, 2017, 8:58 AM CDTHail1.75 inFT PIERRE
Record
  • Aug 21, 2017, 8:58 AM CDT. Hail, 1.75 in, FT PIERRE. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720176.
Aug 21, 2017, 9:01 AM CDTWind70 mph10 NNE DRAPER
Record
  • Aug 21, 2017, 9:01 AM CDT. Wind, 70 mph, 10 NNE DRAPER. Source: NWS Local Storm Reports. Status: Preliminary. Record id: lsr:b9dfebb675b9c2483fd2ec4050d1670e3428ae6399d408488205ef208f7954c0.
Aug 21, 2017, 9:01 AM CDTWind70 mphDRAPER
Record
  • Aug 21, 2017, 9:01 AM CDT. Wind, 70 mph, DRAPER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720182.
Aug 21, 2017, 9:20 AM CDTHail1.50 inMC CLURE
Record
  • Aug 21, 2017, 9:20 AM CDT. Hail, 1.50 in, MC CLURE. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720177.
Aug 21, 2017, 9:30 AM CDTHail1.00 inFT PIERRE
Record
  • Aug 21, 2017, 9:30 AM CDT. Hail, 1.00 in, FT PIERRE. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720178.
Aug 21, 2017, 9:41 AM CDTWind62 mphVIVIAN
Record
  • Aug 21, 2017, 9:41 AM CDT. Wind, 62 mph, VIVIAN. Source: NWS Local Storm Reports. Status: Preliminary. Record id: lsr:0fd94ee8ff4f2380726988725641cbb2acd35f79d9aa20c5b3f7f33e7c65679c.
Aug 21, 2017, 9:41 AM CDTWind62 mphVIVIAN
Record
  • Aug 21, 2017, 9:41 AM CDT. Wind, 62 mph, VIVIAN. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720183.
Aug 21, 2017, 10:20 AM CDTHail1.00 inLYMAN
Record
  • Aug 21, 2017, 10:20 AM CDT. Hail, 1.00 in, LYMAN. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720179.
Aug 21, 2017, 10:20 AM CDTWind64 mphLYMAN
Record
  • Aug 21, 2017, 10:20 AM CDT. Wind, 64 mph, LYMAN. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720181.
Aug 21, 2017, 10:45 AM CDTHail1.00 inOACOMA
Record
  • Aug 21, 2017, 10:45 AM CDT. Hail, 1.00 in, OACOMA. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:720180.
Aug 21, 2017, 11:00 AM CDTHail1.50 in(9V9)CHAMBERLAIN ARP
Record
  • Aug 21, 2017, 11:00 AM CDT. Hail, 1.50 in, (9V9)CHAMBERLAIN ARP. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719866.
Aug 21, 2017, 12:05 PM CDTHail1.75 inAURORA CENTER
Record
  • Aug 21, 2017, 12:05 PM CDT. Hail, 1.75 in, AURORA CENTER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719869.
Aug 21, 2017, 12:10 PM CDTWind60 mphCORSICA
Record
  • Aug 21, 2017, 12:10 PM CDT. Wind, 60 mph, CORSICA. Source: NWS Local Storm Reports. Status: Preliminary. Record id: lsr:92a98b898518507ecf95a2ed5f15200fdb59229896721415666c05e9efd52f7f.
Aug 21, 2017, 12:10 PM CDTWind60 mphCORSICA
Record
  • Aug 21, 2017, 12:10 PM CDT. Wind, 60 mph, CORSICA. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719880.
Aug 21, 2017, 12:53 PM CDTHail1.00 inPARKER
Record
  • Aug 21, 2017, 12:53 PM CDT. Hail, 1.00 in, PARKER. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719872.
Aug 21, 2017, 12:55 PM CDTHail2.00 inOLIVET
Record
  • Aug 21, 2017, 12:55 PM CDT. Hail, 2.00 in, OLIVET. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719873.
Aug 21, 2017, 1:06 PM CDTHail1.75 inMENNO
Record
  • Aug 21, 2017, 1:06 PM CDT. Hail, 1.75 in, MENNO. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719874.
Aug 21, 2017, 1:36 PM CDTHail1.00 inYANKTON
Record
  • Aug 21, 2017, 1:36 PM CDT. Hail, 1.00 in, YANKTON. Source: NCEI Storm Events. Status: Verified against NCEI Storm Events. Record id: ncei:719875.
How We Count

This page uses published ground reports from 2016-01-01 through 2026-10-29. Coverage is partial. 473 source scopes are pending. Pending data is not a zero report count.

Hail counts at 1.00 in or larger. Wind counts at 58 mph or stronger. State days also include tornado reports.

Reports use the local civil date and clock. City pages use the city clock. State pages use each report location clock.

Exact repeated observations are counted once. Nearby reports with different times, coordinates or sizes remain separate observations.

NCEI rows are verified against NCEI Storm Events. SPC and NWS local reports are preliminary.

Radar signatures and warning polygons are not ground reports and are not in these counts.

A missing report does not show that no storm occurred. These pages show city or state exposure, not damage at an address.

This free page covers the state. It does not check a street address.

Limits

This page is not a certified record.

This page shows weather exposure, not damage or cause.

This page is not an expert opinion and it is not a meteorologist review.

Verify these rows with official NOAA and NWS records.

VectorWX is not affiliated with or endorsed by NOAA or NWS.

Radar-estimated hail size comes from MRMS MESH or NCEI nx3hail. It is an estimate of hail aloft. It is not a measurement of hail on a roof.