Hail in Kansas City on Thursday, August 12, 2021
The Storm Prediction Center logged 20 hail reports in Kansas City on Thursday, August 12, 2021, between 3:36 pm and 9:54 pm CDT, in 5 of the metro's 11 counties. The largest was 1.75 inches at Olathe (Johnson, KS) at 5:20 pm. NOAA radar flagged 2,278 hail signatures inside the metro that day: 967 rated a 100% chance of hail and 695 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 11 places in Jackson, MO, Johnson, KS, Leavenworth, KS, Platte, MO and Wyandotte, KS, named as the National Weather Service described them.
- Blue Springs 5 reports, up to 1.75 in
- Olathe 5 reports, up to 1.75 in
- Shawnee 2 reports, up to 1.00 in
- Bonner Springs 1 report, up to 1.50 in
- Edwardsville 1 report, up to 1.25 in
- Independence 1 report, up to 1.00 in
- Johnson Co Arpt 1 report, up to 1.00 in
- Lake Quivira 1 report, up to 1.00 in
- Oak Grove 1 report, up to 1.00 in
- Platte City 1 report, up to 1.00 in
- Weatherby Lake 1 report, up to 1.00 in
Every hail report logged that day
Times are Central Daylight Time. Sizes are in inches, as reported. The comment is the National Weather Service's text as published in the Storm Prediction Center's daily log.
| Time | Size | Place | County | NWS comment |
|---|---|---|---|---|
| 3:36 pm | 1.00 | Platte City | Platte, MO | (EAX) |
| 3:56 pm | 1.00 | 4 NNW Weatherby Lake | Platte, MO | (EAX) |
| 4:40 pm | 1.00 | 2 E Blue Springs | Jackson, MO | (EAX) |
| 4:47 pm | 1.75 | 2 NNE Blue Springs | Jackson, MO | (EAX) |
| 4:54 pm | 1.25 | 2 NE Blue Springs | Jackson, MO | DELAYED REPORT... (EAX) |
| 5:00 pm | 1.00 | Oak Grove | Jackson, MO | DELAYED REPORT... (EAX) |
| 5:00 pm | 1.25 | 2 NE Blue Springs | Jackson, MO | DELAYED REPORT... (EAX) |
| 5:02 pm | 1.25 | 3 NE Blue Springs | Jackson, MO | DELAYED REPORT... (EAX) |
| 5:09 pm | 1.25 | 2 ENE Olathe | Johnson, KS | DELAYED REPORT... (EAX) |
| 5:11 pm | 1.00 | Olathe | Johnson, KS | (EAX) |
| 5:15 pm | 1.25 | 2 E Olathe | Johnson, KS | DELAYED REPORT... (EAX) |
| 5:20 pm | 1.75 | Olathe | Johnson, KS | QUARTER TO GOLF BALL SIZED HAIL (EAX) |
| 5:38 pm | 1.00 | Johnson Co Arpt | Johnson, KS | (EAX) |
| 7:30 pm | 1.50 | 2 ESE Olathe | Johnson, KS | DELAYED REPORT... (EAX) |
| 8:13 pm | 1.00 | 1 E Shawnee | Johnson, KS | DELAYED REPORT FROM MPING... (EAX) |
| 8:17 pm | 1.00 | Shawnee | Johnson, KS | NICKEL TO QUARTER SIZE HAIL REPORTED AT 68TH AND LACKMAN. (EAX) |
| 8:25 pm | 1.00 | 2 E Lake Quivira | Johnson, KS | DELAYED REPORT FROM MPING... (EAX) |
| 8:39 pm | 1.00 | 3 SE Independence | Jackson, MO | DELAYED REPORT FROM MPING... (EAX) |
| 9:45 pm | 1.50 | 7 W Bonner Springs | Leavenworth, KS | (EAX) |
| 9:54 pm | 1.25 | Edwardsville | Wyandotte, KS | (EAX) |
What NEXRAD radar recorded inside the metro
2,278 signatures from 5 radars fell inside the metro's counties on this local date, counting every cell the algorithm rated from a 10% to a 100% chance of hail; 967 were rated 100% and 23 had a maximum expected size of 2 inches or more.
| Radar | Signatures | Rated 100% | 1 in or more | 2 in or more | Largest expected | First | Last |
|---|---|---|---|---|---|---|---|
| KMCI | 899 | 281 | 222 | 0 | 1.75 in | 12:43 pm | 11:54 pm |
| KTWX | 592 | 293 | 186 | 4 | 2.50 in | 5:49 am | 11:54 pm |
| KEAX | 479 | 222 | 169 | 10 | 2.50 in | 5:50 am | 11:54 pm |
| KSGF | 304 | 170 | 118 | 9 | 2.25 in | 3:28 pm | 11:54 pm |
| KDMX | 4 | 1 | 0 | 0 | 0.75 in | 1:59 pm | 10:28 pm |
Each radar that scans a storm writes its own signature about every 4 to 6 minutes, so one storm produces many rows and overlapping radars count it more than once. The raw rows for this day are in NOAA's Severe Weather Data Inventory.
Check an address for August 12, 2021
See, free, how many hail signatures NOAA recorded within 1, 3 and 5 miles of one address that day and the nearest spotter report. The full report is $19.
Spotter reports come from the Storm Prediction Center's preliminary daily logs, grouped here by local calendar date (Central Daylight Time) and by county: a report counts for Kansas City when its coordinates fall inside one of the metro's 11 counties (the counties of Jackson, MO, Clay, MO, Platte, MO, Cass, MO, Ray, MO, Clinton, MO, Lafayette, MO, Johnson, KS, Wyandotte, KS, Leavenworth, KS and Miami, KS). Radar signatures are estimates from the Hail Detection Algorithm, not measured stones; they include every cell it rated, from a 10% to a 100% probability of hail. How these pages are built.