McHenry County, Illinois
To view the watches and warnings information that we have available you will need to select your city, county, or state first.
Enter City, State or Zip Code to Select a Location from the List
Click to view enlarged map

The National Weather Service's Watches, Warnings and Advisories by state counties include: Thunderstorm, Tornado, Flood, Flash Flood, Winter Storm, High Wind, Gale, Small Aircraft, High Surf, Marine, Heat, Air Quality, Ashfall, Hazardous, and Special Statements.
Weather Alerts: McHenry County, Illinois
« View county list

Flood Advisory
400 PM CDT THU MAR 30 2017

The National Weather Service in Chicago has issued a
* Flood Advisory for
The Fox River at Algonquin Tailwater.
* until late Friday night.
* At 330 PM Thursday the stage was 8.5 feet.
* Action stage is 9.0 feet.
* Flood stage is 9.5 feet.
* Recent activity...Flood forecasts for Algonquin were moved to this
location on July 5 2011. Gage zero datum is different from the old
gage location. Flood and action stages have changed.
* Forecast...The river will rise to near 9.2 feet by Friday evening.


LAT...LON 4224 8828 4195 8838 4194 8827 4221 8814
4237 8817 4238 8830


Flood Advisory
Kendall IL-La Salle IL-DuPage IL-Cook IL-Boone IL-Livingston IL-
Lake IL-Will IL-Ogle IL-Lee IL-De Kalb IL-Winnebago IL-Grundy IL-
Kane IL-McHenry IL-
707 PM CDT THU MAR 30 2017

The National Weather Service in Chicago has issued a

* Urban and Small Stream Flood Advisory for Rapid Rises for...
Kendall County in northeastern Illinois...
La Salle County in north central Illinois...
DuPage County in northeastern Illinois...
Cook County in northeastern Illinois...
Boone County in north central Illinois...
Livingston County in central Illinois...
Lake County in northeastern Illinois...
Will County in northeastern Illinois...
Ogle County in north central Illinois...
Lee County in north central Illinois...
De Kalb County in north central Illinois...
Winnebago County in north central Illinois...
Grundy County in northeastern Illinois...
Kane County in northeastern Illinois...
McHenry County in northeastern Illinois...

* Until midnight CDT

* At 700 PM CDT, trained weather spotters reported urban and small
stream flooding due to heavy rain associated with thunderstorms
that moved through the area last night and earlier today. Flooding
is most prevalent near streams and rivers and in low lying areas
with poor drainage. Over two inches of rain fell over the area.
Additional light rain is expected this evening, but no additional
heavy rain is likely.


Be especially cautious at night when it is harder to recognize the
dangers of flooding.

A Flood Advisory means river or stream flows are elevated, or ponding
of water in urban or other areas is occurring or is imminent.


LAT...LON 4249 8780 4227 8783 4172 8752 4130 8753
4129 8801 4121 8801 4120 8824 4062 8824
4062 8857 4076 8858 4075 8893 4093 8893
4093 8905 4110 8905 4110 8916 4158 8917
4159 8963 4220 8969 4220 8940 4250 8940


National Weather Service

Providing "weather, water cycle, and climate forecasts and warnings for the United States, its territories, adjacent waters and ocean areas, for the protection of life and property and the enhancement of the national economy."
Weather Alerts by Type
Air Quality Alert
Aviation Weather Warning
Blizzard Warning
Blowing Dust Advisory
Coastal Flood Advisory
Coastal Flood Warning
Dust Storm Warning
Fire Weather Warning
Fire Weather Watch
Flood Advisory
Flood Warning
Flood Watch
Freezing Rain Advisory
Frost Advisory
High Surf Advisory
High Wind Warning
Lake Wind Advisory
Rip Current Statement
Severe Thunderstorm Warning
Special Weather Statement
Wind Advisory
Winter Storm Warning
Winter Storm Watch
Winter Weather Advisory
Additional Severe Weather Maps
Severe Outlook Today
Severe Outlook Today
WSI's Severe Outlook Map displays current Watches, Warnings and Advisories via County Fill colors.
Severe Outlook Tomorrow
Severe Outlook Tomorrow
WSI's Severe Outlook Forecast Map displaying projected Watches, Warnings and Advisories.
The THUNDERcast map shows areas of probability for regional or national thunderstorms for the current day.
1Km Storm Watch
1Km Storm Watch
The 1Km map allows you to view 1 kilometer (km) resolution radar imagery both nationally and regionally.
Metro Storm Watch
Metro Storm Watch
The Metro map allows you to view 1 kilometer (km) resolution radar imagery.
Track Severe Weather on mobile