Active AlertsBuffalo Grove, IL

What: Flash flooding caused by excessive rainfall is possible.
Where: Portions of Illinois, including the following areas, Boone, Central Cook, De Kalb, DuPage, Eastern Will, Kane, Kendall, Lake IL, McHenry, Northern Cook, Northern Will, Ogle, Southern Cook, Southern Will and Winnebago and northwest Indiana, including the following area, Lake IN.
When: Until 6 AM CDT Wednesday.
Impacts: Creeks and streams may rise out of their banks. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded.
Additional Details: - An area of thunderstorms with rain rates up to one to two inches per hour is expected to move through the area this evening through the overnight hours. Elevated soil moisture due to recent rainfall is expected to increase the susceptibility to flash flooding. - http://www.weather.gov/safety/flood

A Flood Watch for flash flooding means rapid-onset flooding is possible, but not yet certain, based upon the latest forecasts. Flash flooding is a dangerous situation. Persons with interests along area rivers, creeks, and other waterways should monitor the latest forecasts and be prepared to take action should flooding develop.

The Flood Watch continues for the following rivers in Wisconsin Illinoi
S: Wisconsin River At Wisconsin Dells affecting Columbia and Sauk Counties. Fox River Lower Near New Munster affecting Lake and Kenosha Counties.
What: Flooding is possible.
Where: Fox River Lower near New Munster.
When: Until further notice.
Impacts: At 13.5 feet, Floodwaters are into the lower levels of some homes in the Town of Wheatland and Village of Salem Lakes areas along Riverside Drive and Shorewood Drive.
Additional Details: - At 3:00 PM CDT Tuesday the stage was 10.0 feet. - ForecastFlood stage may be reached late tomorrow morning. - Flood stage is 11.0 feet. - http://www.weather.gov/safety/flood

If you are in the watch area, remain alert to possible flooding. Residents and those with interests near the river should monitor rising water levels and be prepared for possible flood warnings. Additional information is available at www.weather.gov. The next statement will be issued late tonight at 1215 AM CDT.

The Flood Warning continues for the following rivers in Illinoi
S: Fox River at Algonquin Lock & Dam tailwater affecting Kane, McHenry and Lake IL Counties. For the Fox River (Illinois)including Algonquin Lock & Dam tailwaterMinor flooding is forecast.
What: Minor flooding is forecast.
Where: Fox River from Johnsburg downstream to Red Gate Road in St. Charles, including the Algonquin Lock & Dam tailwater gauge.
When: Until further notice.
Impacts: At 9.5 feet, Fox River Drive threatened in East Dundee. Boathouses threatened along the river in Cary.
Additional Details: - At 8:30 PM CDT Tuesday the stage was 9.4 feet. - ForecastDue to rainfall tonight and Wednesday, the river is expected to rise above flood stage late tonight and remain in flood for several days. - Flood stage is 9.5 feet. - http://www.weather.gov/safety/flood

A Flood Warning means water levels above flood stage are imminent or may already be occurring. Persons along rivers and streams in the warned area should take immediate precautions to protect life and property. These forecasts are based on observed precipitation as well as forecast precipitation 24 hours into the future. Changes to the rainfall forecast, or any additional rainfall after 24 hours, may cause changes to these river forecasts. Additional information is available at www.weather.gov. The next statement will be issued by Wednesday afternoon.

At 910 PM CDT, severe thunderstorms were located along a line extending from Pleasant Prairie to McHenry, moving southeast at 45 mph.
Hazard: 70 mph wind gusts.
Source: Radar indicated.
Impact: Expect considerable tree damage. Damage is likely to mobile homes, roofs, and outbuildings. Locations impacted include Waukegan, Gurnee, Mundelein, Round Lake Beach, Zion, Grayslake, Libertyville, Round Lake, Wauconda, Lindenhurst, North Chicago, Vernon Hills, Long Grove, Lake Bluff, Green Oaks, Buffalo Grove, Lake Forest, Lincolnshire, Highland Park, Deerfield, Highwood, Riverwoods, Bannockburn, Northbrook and Glencoe.

A Tornado Watch remains in effect until midnight CDT for northeastern Illinois. Remain alert for a possible tornado! Tornadoes can develop quickly from severe thunderstorms. If you spot a tornado go at once into the basement or small central room in a sturdy structure. For your protection move to an interior room on the lowest floor of a building.

Waves of showers and thunderstorms are expected this evening through the end of the week. Urban and river flooding will be possible. Atmospheric conditions are favorable for some thunderstorms to have rainfall rates in excess of 1 to 2 inches per hour tonight and tomorrow. In addition, some rivers and streams remain elevated from recent rainfall and soil moisture is elevated across most of northern Illinois and northwestern Indiana. In urban and poor drainage areas isolated flooding of roadways, creeks, and streams may occur with areas of heaviest rainfall. Widespread rainfall may also lead to river rises and possible flooding, in particular along already elevated rivers such as the Fox, Des Plaines, and Kankakee. Additional chances for rainfall are expected to continue through the remainder of the week. This outlook means that elevated water levels and potential impacts are possible, but not yet certain. Persons should closely monitor forecasts including the possibility of flood watches, warnings, and advisories. This product will be updated by tomorrow morning.