Alert archive / Illinois / McHenry County / 2021
Weather alerts in McHenry County, Illinois, August 2021
29 weather alerts in August 2021, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 29
- Warnings
- 6
- Watches
- 4
- Advisories
- 8
- Busiest day
- August 10, 20216 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 |
|---|---|---|---|
| Aug 6, 3:23 PM CDT | Mesoscale Discussion | SPC | 97 min |
| Aug 9, 11:49 AM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 9, 12:18 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 9, 2:43 PM CDT | Tornado Watch | SPC | 9 hr |
| Aug 9, 2:46 PM CDT | Heat Advisory | LOT | 28 hr |
| Aug 9, 4:12 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 10, 3:07 PM CDT | Heat Advisory | LOT | 28 hr |
| Aug 10, 3:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 10, 3:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
| Aug 10, 5:51 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 10, 6:16 PM CDT | Severe Thunderstorm Warning | LOT | 74 min |
| Aug 10, 6:34 PM CDT | Severe Thunderstorm Warning | LOT | 86 min |
| Aug 11, 9:46 AM CDT | Severe Thunderstorm Warning | LOT | 59 min |
| Aug 11, 7:35 PM CDT | Mesoscale Discussion | SPC | 85 min |
| Aug 11, 8:22 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
| Aug 11, 11:06 PM CDT | Mesoscale Discussion | SPC | 84 min |
| Aug 19, 4:44 PM CDT | Special Weather Statement | LOT | 46 min |
| Aug 20, 5:23 AM CDT | Dense Fog Advisory | LOT | 3 hr |
| Aug 24, 3:09 PM CDT | Mesoscale Discussion | SPC | 66 min |
| Aug 24, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Aug 24, 4:58 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 24, 5:10 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Aug 24, 5:40 PM CDT | Flash Flood Warning | LOT | 4 hr |
| Aug 24, 6:09 PM CDT | Severe Thunderstorm Warning | LOT | 66 min |
| Aug 24, 7:08 PM CDT | Severe Thunderstorm Warning | LOT | 67 min |
| Aug 24, 7:31 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Aug 28, 5:26 PM CDT | Areal Flood Advisory | LOT | 2 hr |
| Aug 29, 1:05 PM CDT | Special Weather Statement | LOT | 40 min |
| Aug 29, 1:18 PM CDT | Mesoscale Discussion | SPC | 87 min |
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
| Product | Alerts |
|---|---|
| Severe storms | |
| Severe Thunderstorm Warning | 5 |
| Severe Thunderstorm Watch | 3 |
| Tornado Watch | 1 |
| Mesoscale Discussion | 9 |
| Special Weather Statement | 2 |
| Flooding | |
| Flash Flood Warning | 1 |
| Areal Flood Advisory | 5 |
| Heat | |
| Heat Advisory | 2 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive20202022
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.