Hail in Kansas City on Monday, September 20, 2021
The Storm Prediction Center logged 6 hail reports in Kansas City on Monday, September 20, 2021, between 5:12 pm and 6:27 pm CDT, in 2 of the metro's 11 counties. The largest was 1.75 inches at 2 W Merriam (Johnson, KS) at 5:40 pm. NOAA radar flagged 864 hail signatures inside the metro that day: 294 rated a 100% chance of hail and 215 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 4 places in Clay, MO and Johnson, KS, named as the National Weather Service described them.
- Lake Quivira 2 reports, up to 1.00 in
- Merriam 2 reports, up to 1.75 in
- Liberty 1 report, up to 1.25 in
- Shawnee 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 |
|---|---|---|---|---|
| 5:12 pm | 1.00 | 4 WSW Shawnee | Johnson, KS | (EAX) |
| 5:26 pm | 1.00 | 3 SSE Lake Quivira | Johnson, KS | DELAYED REPORT FROM MPING. (EAX) |
| 5:28 pm | 1.00 | 2 SE Lake Quivira | Johnson, KS | (EAX) |
| 5:30 pm | 1.00 | 2 W Merriam | Johnson, KS | DELAYED REPORT FROM MPING. (EAX) |
| 5:40 pm | 1.75 | 2 W Merriam | Johnson, KS | (EAX) |
| 6:27 pm | 1.25 | Liberty | Clay, MO | (EAX) |
What NEXRAD radar recorded inside the metro
864 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; 294 were rated 100% and 12 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 |
|---|---|---|---|---|---|---|---|
| KTWX | 276 | 120 | 83 | 4 | 2.25 in | 4:41 pm | 9:59 pm |
| KMCI | 256 | 41 | 37 | 0 | 1.75 in | 4:38 pm | 7:53 pm |
| KEAX | 167 | 77 | 67 | 8 | 2.75 in | 4:44 pm | 10:04 pm |
| KSGF | 162 | 56 | 28 | 0 | 1.75 in | 5:09 pm | 10:08 pm |
| KICT | 3 | 0 | 0 | 0 | 0.50 in | 5:39 pm | 6:01 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 September 20, 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.