Alert archive / Illinois / McHenry County / 2026
Weather alerts in McHenry County, Illinois, April 2026
35 weather alerts in April 2026, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.
- Alerts
- 35
- Warnings
- 16
- Watches
- 9
- Advisories
- 4
- Busiest day
- April 18, 202610 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 |
|---|---|---|---|
| Apr 2, 1:43 PM CDT | Tornado Watch | SPC | 8 hr |
| Apr 2, 7:00 PM CDT | Severe Thunderstorm Warning | LOT | 60 min |
| Apr 2, 7:01 PM CDT | Severe Thunderstorm Warning | LOT | 59 min |
| Apr 2, 7:40 PM CDT | Tornado Warning | LOT | 35 min |
| Apr 2, 8:01 PM CDT | Areal Flood Advisory | LOT | 3 hr |
| Apr 3, 3:56 PM CDT | Flood Watch | LOT | 18 hr |
| Apr 5, 9:01 PM CDT | River Flood Watch | LOT | 23 hr |
| Apr 6, 8:26 PM CDT | River Flood Warning | LOT | 28 days |
| Apr 14, 2:33 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 14, 7:11 PM CDT | Flood Watch | LOT | 30 hr |
| Apr 14, 8:12 PM CDT | Severe Thunderstorm Warning | LOT | 78 min |
| Apr 14, 8:32 PM CDT | Mesoscale Discussion | SPC | 88 min |
| Apr 14, 9:28 PM CDT | Severe Thunderstorm Warning | LOT | 62 min |
| Apr 15, 2:48 AM CDT | Severe Thunderstorm Warning | LOT | 42 min |
| Apr 15, 4:49 PM CDT | Mesoscale Discussion | SPC | 86 min |
| Apr 15, 7:55 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
| Apr 15, 9:26 PM CDT | Mesoscale Discussion | SPC | 94 min |
| Apr 16, 7:01 PM CDT | Dense Fog Advisory | LOT | 15 hr |
| Apr 17, 11:48 AM CDT | Flood Watch | LOT | 15 hr |
| Apr 17, 12:40 PM CDT | Tornado Watch | SPC | 9 hr |
| Apr 17, 4:42 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 7:16 PM CDT | Severe Thunderstorm Warning | LOT | 74 min |
| Apr 17, 7:28 PM CDT | Tornado Warning | LOT | 47 min |
| Apr 17, 8:09 PM CDT | Mesoscale Discussion | SPC | 2 hr |
| Apr 17, 8:12 PM CDT | Flash Flood Warning | LOT | 6 hr |
| Apr 17, 8:29 PM CDT | Severe Thunderstorm Warning | LOT | 31 min |
| Apr 17, 8:36 PM CDT | Tornado Warning | LOT | 39 min |
| Apr 18, 1:54 AM CDT | Areal Flood Warning | LOT | 6 hr |
| Apr 18, 1:29 PM CDT | Frost Advisory | LOT | 20 hr |
| Apr 18, 1:29 PM CDT | Freeze Watch | LOT | 12 hr |
| Apr 18, 2:20 PM CDT | Areal Flood Warning | LOT | 13 days |
| Apr 19, 1:52 AM CDT | Freeze Warning | LOT | 30 hr |
| Apr 21, 1:07 PM CDT | Mesoscale Discussion | SPC | 113 min |
| Apr 27, 11:18 AM CDT | Wind Advisory | LOT | 5 hr |
| Apr 27, 12:50 PM CDT | High Wind Warning | LOT | 3 hr |
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 | 7 |
| Tornado Warning | 3 |
| Severe Thunderstorm Watch | 1 |
| Tornado Watch | 3 |
| Mesoscale Discussion | 6 |
| Flooding | |
| Areal Flood Warning | 2 |
| Flash Flood Warning | 1 |
| River Flood Warning | 1 |
| Flood Watch | 3 |
| River Flood Watch | 1 |
| Areal Flood Advisory | 1 |
| Cold | |
| Freeze Warning | 1 |
| Freeze Watch | 1 |
| Frost Advisory | 1 |
| Wind and dust | |
| High Wind Warning | 1 |
| Wind Advisory | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 1 |
Nearby
Alerts in force nowTornadoes on recordForecastThe radar archive2025
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. Warning verification from the Mesonet's Cow. Rebuilt daily.