Mchenry County, IL Weather Alerts
Every National Weather Service alert issued for Mchenry County, Illinois, pushed to your phone within moments — county code ILC111, forecast zone ILZ005. Free with StormCast.
Download on Google PlayHow the NWS identifies Mchenry County
These are the identifiers the National Weather Service uses when it issues a warning here. StormCast watches ILC111 directly rather than matching on place names, which is why an alert arrives whether you are in Alden or anywhere else in the county.
NWS County Code
ILC111
Forecast Zone
ILZ005
Forecast Office
Romeoville (LOT)
Radar Station
KMKX
Towns covered in Mchenry County
An NWS alert for Mchenry County applies to all 17 of these communities. You do not need a separate alert for each one.
River gauges in and around Mchenry County
StormCast tracks 8 gauges near Mchenry County. Set a flood-stage alert on any of them to get notified before the water reaches you.
Current conditions
Loading current conditions…
Alert types issued for Mchenry County
Tornado
Tornado Warning, Tornado Watch, Tornado Emergency and Severe Thunderstorm Warning.
How tornado alerts work →Flooding
Flash Flood Warning, Flood Watch, Flood Advisory and River Flood Warning.
How flood alerts work →Winter
Winter Storm Warning, Ice Storm Warning, Blizzard Warning and Winter Weather Advisory.
Winter warnings explained →Fire Weather
Red Flag Warning and Fire Weather Watch when conditions favor rapid fire spread.
Fire weather alerts →Heat & Cold
Excessive Heat Warning, Heat Advisory, Freeze Warning and Frost Advisory.
Frost & freeze alerts →Mchenry County weather alert questions
Which NWS forecast zone is Mchenry County in?
Mchenry County, Illinois is NWS county code ILC111 and forecast zone ILZ005. Alerts for it are issued by the Romeoville (LOT) Weather Forecast Office, and the nearest NEXRAD radar is KMKX.
Which towns in Mchenry County are covered?
All of them. NWS alerts are issued at the county and zone level, so a warning for Mchenry County covers every community inside it, including Alden, Algonquin, Cary, Crystal Lake, Fox River Grove, Harvard, Hebron, Huntley, Lake In The Hills, Marengo, Mchenry, Richmond, Ringwood, Spring Grove, Union, Wonder Lake and Woodstock.
Are there river gauges in Mchenry County?
Yes — StormCast monitors 8 river gauges in and around Mchenry County, including Boone Creek near Mchenry, Nippersink Creek at Wonder Lake, Fox River at McHenry (Stratton Lock and Dam) tailwater. You can set a flood-stage alert on any of them and get a push notification when the water rises.
How fast are alerts for Mchenry County delivered?
StormCast polls the NWS alert feed every 30 seconds. When a warning is issued for ILC111, the push notification goes out within moments — even with your screen off.