Alert archive / Illinois / McHenry County / 2020
Weather alerts in McHenry County, Illinois, May 2020
18 weather alerts in May 2020, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 18
- Warnings
- 9
- Watches
- 3
- Advisories
- 5
- Busiest day
- May 23, 20206 alerts
Over time
By day
Days in UTC, the clock the archive keeps.
The alerts
Every alert, in the order issued. Times are local, Central Time. Each opens its own page with the text, the map, the radar and the sounding.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 7, 3:33 AM CDT | Freeze Watch | LOT | 24 hr |
| May 8, 3:56 AM CDT | Freeze Warning | LOT | 27 hr |
| May 11, 2:45 PM CDT | Frost Advisory | LOT | 17 hr |
| May 14, 9:58 AM CDT | River Flood Warning | LOT | 19 days |
| May 14, 10:47 PM CDT | Areal Flood Advisory | LOT | 4 hr |
| May 15, 12:11 AM CDT | Flash Flood Warning | LOT | 4 hr |
| May 15, 4:14 AM CDT | Areal Flood Warning | LOT | 6 hr |
| May 15, 10:41 AM CDT | Areal Flood Advisory | LOT | 6 hr |
| May 16, 2:47 PM CDT | Flash Flood Watch | LOT | 32 hr |
| May 17, 2:04 PM CDT | Areal Flood Advisory | LOT | 6 hr |
| May 17, 4:32 PM CDT | Flash Flood Warning | LOT | 6 hr |
| May 17, 10:10 PM CDT | Areal Flood Warning | LOT | 30 hr |
| May 23, 12:33 PM CDT | Tornado Watch | SPC | 8 hr |
| May 23, 2:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| May 23, 6:04 PM CDT | Severe Thunderstorm Warning | LOT | 56 min |
| May 23, 6:13 PM CDT | Tornado Warning | LOT | 47 min |
| May 23, 6:48 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| May 23, 6:57 PM CDT | Severe Thunderstorm Warning | LOT | 79 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20192021
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.