The NOAA Storm Prediction Center logged 1 tornado report, 18 hail reports and 28 damaging-wind reports for the storm day from 12:00 UTC on Aug 21, 2024 to 12:00 UTC the next morning — most of them in SD, MT, AZ.
| UTC | Rating | Place | County | State | Remarks |
|---|---|---|---|---|---|
| 23:31 | — | 8 N Benson | Cochise | AZ | Storm chaser live streamed video of tornado on mountain in the distant. Exact location of tornado estimated by radar. (TWC) |
| UTC | Size | Place | County | State | Remarks |
|---|---|---|---|---|---|
| 19:11 | 1.00″ | 5 W Chino Valley | Yavapai | AZ | Report from mPING: Quarter (1.00 in.). (FGZ) |
| 19:21 | 1.00″ | 8 Wnw Tucson | Pima | AZ | Report from trained spotter of accumulating 1 inch hail. (TWC) |
| 19:23 | 1.25″ | 8 Wnw Tucson | Pima | AZ | Trained spotter reported 1.25 inch accumulating hail. (TWC) |
| 22:25 | 1.50″ | 2 Nw Willcox | Cochise | AZ | Video on social media showing accumulating hail with the biggest hailstone being 1.5 inches in diameter. Another video at same location showed damage to car windshield (TWC) |
| 23:14 | 1.75″ | 6 Ssw Gering | Scotts Bluff | NE | Half dollar to golf ball sized hail reported by chaser between County Road 17 and Highway 71. (CYS) |
| 00:00 | 1.00″ | 1 Nnw Nemo | Lawrence | SD | (UNR) |
| 00:01 | 1.00″ | 8 Se Loma | Chouteau | MT | Hail up to quarter size falling. (TFX) |
| 00:43 | 2.00″ | 8 Ese Ottumwa | Haakon | SD | (UNR) |
| 01:00 | 1.50″ | 5 S Bunker | Stanley | SD | Marble to Ping Pong Ball sized hail reported to have fallen. (ABR) |
| 01:10 | 1.00″ | 10 S Vida | Mccone | MT | (GGW) |
| 01:22 | 1.00″ | 5 Ssw Vida | Mccone | MT | (GGW) |
| 01:23 | 1.00″ | 1 S Colstrip | Rosebud | MT | Report from Facebook. (BYZ) |
| 01:25 | 1.00″ | 10 Nne Circle | Mccone | MT | E60 MPH wind. (GGW) |
| 01:53 | 2.00″ | 11 Sw Richey | Dawson | MT | Corrects previous hail report from 11 SW Richey. Report from mPING: Ping Pong Ball (1.50 in.). (GGW) |
| 02:00 | 2.50″ | 4 Nw Murdo | Jones | SD | Golf ball to tennis ball size hail. (ABR) |
| 02:00 | 1.00″ | 8 Sse Van Metre | Jones | SD | Picture of 1 inch hail sent via Google Voice. (ABR) |
| 02:15 | 2.50″ | 5 N Volborg | Custer | MT | Report from Facebook. (BYZ) |
| 03:10 | 1.50″ | 5 Se Capa | Jones | SD | (ABR) |
| UTC | Gust | Place | County | State | Remarks |
|---|---|---|---|---|---|
| 22:28 | 58 mph | 11 Nw Willcox | Cochise | AZ | Personal weather station recorded gust to 58 MPH. (TWC) |
| 22:55 | 60 mph | 6 Sw Gering | Scotts Bluff | NE | Chaser reported 50-60 mph microburst winds. (CYS) |
| 23:30 | 62 mph | 11 Ssw Oelrichs | Fall River | SD | (UNR) |
| 23:34 | 62 mph | 2 W Gering | Scotts Bluff | NE | Scottsbluff RAWS site. (CYS) |
| 23:45 | 60 mph | 6 S Needles | San Bernardino | CA | KEED ASOS measured a peak wind gust to 60 mph as thunderstorm approached from the south. Blowing dust also noted on nearby webcam. (VEF) |
| 23:46 | 60 mph | 7 E Geyser | Judith Basin | MT | 60 mph thunderstorm wind gust at Geyser AWOS. (TFX) |
| 00:01 | 60 mph | 13 W Oglala | Oglala Lakota | SD | (UNR) |
| 00:14 | 66 mph | 6 S Needles | San Bernardino | CA | Corrects previous tstm wnd gst report from 6 S Needles. KEED ASOS gusted to 66 mph at 514 mph as another thunderstorm core moved overhead. (VEF) |
| 00:15 | 61 mph | 6 S Needles | San Bernardino | CA | KEED ASOS gusted to 61 mph at 515 mph as another thunderstorm core moved overhead. (VEF) |
| 00:50 | 60 mph | Porcupine | Oglala Lakota | SD | (UNR) |
| 01:03 | 60 mph | 5 E Fort Peck | Mccone | MT | small hail. (GGW) |
| 01:22 | 59 mph | 5 Sw Cortez | Montezuma | CO | ASOS station KCEZ Cortez Municipal Airport. (GJT) |
| 01:24 | 63 mph | 3 Nw Wasta | Pennington | SD | (UNR) |
| 01:41 | 66 mph | 3 W Farmington | San Juan | NM | ASOS station KFMN Farmington Airport. (ABQ) |
| 01:53 | 61 mph | 3 Ene Wolf Point | Roosevelt | MT | ASOS station KOLF Wolf Point Airport. (GGW) |
| 02:10 | 60 mph | 6 W Milesville | Haakon | SD | (UNR) |
| 02:18 | 62 mph | 6 E Poplar | Roosevelt | MT | (GGW) |
| 02:34 | 62 mph | 2 Ssw Sidney | Cheyenne | NE | Sidney ASOS. (CYS) |
| 02:40 | 64 mph | 1 Ene Harrold | Hughes | SD | Mesonet station 19 Harrold (SDDOT). (ABR) |
| 02:45 | 67 mph | 5 Ese Hoyt | Dawson | MT | Mesonet station MTM28 5.2 E Hoyt (MT-MESO). (GGW) |
| 02:54 | 59 mph | 13 Nnw Sansarc | Stanley | SD | Mesonet station 168 Foster Bay (SDDOT). (ABR) |
| 02:55 | 60 mph | 13 Ne Kirley | Haakon | SD | (UNR) |
| 03:00 | 65 mph | 13 Nnw Sansarc | Stanley | SD | Mesonet station 168 Foster Bay (SDDOT). (ABR) |
| 03:14 | 59 mph | 1 E Pierre Regional Air | Hughes | SD | ASOS station KPIR Pierre Muni AP. (ABR) |
| 03:20 | 60 mph | 12 N Mission Ridge | Dewey | SD | Power outage from event time until 4 am the following morning. (ABR) |
| 04:51 | 62 mph | 1 Se Baker | Fallon | MT | ASOS station KBHK Baker. (BYZ) |
| 04:55 | 62 mph | 1 E Holloman Afb | Otero | NM | Heat burst detected on radar and surface observations. AWOS station KHMN Holloman AFB. (EPZ) |
| 05:15 | 58 mph | 2 Nnw Grant | Perkins | NE | AWOS station KGGF Grant Airport. (LBF) |
Original file: SPC report page for this day. Times are UTC; the storm day starts at 12:00 UTC (7 AM CDT).