Hail in Denver on Tuesday, May 9, 2023
The Storm Prediction Center logged 10 hail reports in Denver on Tuesday, May 9, 2023, between 6:12 pm and 11:17 pm MDT, in 2 of the metro's 7 counties. The largest was 2.00 inches at 2 N Longmont (Boulder County) at 11:17 pm. NOAA radar flagged 336 hail signatures inside the metro that day: 175 rated a 100% chance of hail and 140 with a maximum expected size of 1 inch or more.
Where hail was reported
Reports came from 6 places in Adams and Boulder counties, named as the National Weather Service described them.
- Longmont 3 reports, up to 2.00 in
- Brighton 2 reports, up to 1.00 in
- Niwot 2 reports, up to 1.00 in
- Hygiene 1 report, up to 1.00 in
- Lochbuie 1 report, up to 1.75 in
- Thornton 1 report, up to 1.00 in
Every hail report logged that day
Times are Mountain 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 |
|---|---|---|---|---|
| 6:12 pm | 1.00 | 2 NE Thornton | Adams | FROM TWITTER... WITH PHOTO. (BOU) |
| 7:10 pm | 1.00 | 1 NE Brighton | Adams | VIA SPOTTERNETWORK.ORG... NOT THE LARGEST STONE. (BOU) |
| 7:23 pm | 1.00 | Brighton | Adams | AD1150?. (BOU) |
| 7:35 pm | 1.75 | 5 ESE Lochbuie | Adams | FROM TWITTER. (BOU) |
| 10:35 pm | 1.00 | 3 N Niwot | Boulder | (BOU) |
| 10:35 pm | 1.00 | 2 SSE Hygiene | Boulder | (BOU) |
| 10:38 pm | 1.00 | 1 WNW Niwot | Boulder | (BOU) |
| 10:45 pm | 1.00 | 2 N Longmont | Boulder | CO-BO-143. (BOU) |
| 10:51 pm | 1.75 | Longmont | Boulder | REPORT FROM MPING: GOLF BALL (1.75 IN.). (BOU) |
| 11:17 pm | 2.00 | 2 N Longmont | Boulder | REPORT FROM MPING: HEN EGG (2.00 IN.). (BOU) |
What NEXRAD radar recorded inside the metro
336 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; 175 were rated 100% and 27 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 |
|---|---|---|---|---|---|---|---|
| KDEN | 128 | 44 | 44 | 8 | 2.25 in | 5:39 pm | 11:20 pm |
| KPUX | 84 | 54 | 43 | 8 | 2.75 in | 5:41 pm | 11:28 pm |
| KCYS | 58 | 43 | 27 | 7 | 2.75 in | 5:41 pm | 10:56 pm |
| KFTG | 56 | 34 | 26 | 4 | 2.50 in | 5:35 pm | 11:26 pm |
| KGLD | 10 | 0 | 0 | 0 | 0.50 in | 9:52 pm | 10:26 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 May 9, 2023
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 (Mountain Daylight Time) and by county: a report counts for Denver when its coordinates fall inside one of the metro's 7 counties (Adams, Arapahoe, Boulder, Broomfield, Denver, Douglas and Jefferson counties). 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.