La Salle County, IL
Alerts
Alerts are listed in order of start time and level of severity. Click on the alert title to read details for each alert.
In effect from Saturday 04/18 9:00 AM CDT – Saturday 04/18 8:00 AM CDT
Issued by NWS Chicago IL
The National Weather Service in Chicago IL has issued a Flood Warning for the following rivers in Illinois
Illinois River at La Salle affecting La Salle, Bureau and Putnam Counties.
For the Illinois River (Upper)...including Ottawa, La Salle...Minor flooding is forecast.
What
Minor flooding is forecast.
Where
Illinois River from Starved Rock Lock and Dam downstream to confluence with Big Bureau Creek, including the La Salle gauge.
When
From Saturday morning until further notice.
Impacts
At 22.0 feet, Lower parking lot at Starved Rock State Park is inundated east of La Salle. High water levels begin to impact shipping interests along the river.
Additional Details
- At 12:45 PM CDT Friday the stage was 19.5 feet. - Forecast...The river is expected to rise above flood stage late tomorrow morning and continue rising to a crest of 23.2 feet Monday morning. - Flood stage is 20.0 feet. - http://www.weather.gov/safety/flood
What to do
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 Saturday morning.
Areas impacted
- Bureau, IL
- La Salle, IL
- Putnam, IL
Tips to stay safe
A Flood Warning means that dangerous flooding is expected or already happening. Take immediate action to protect yourself and your home.
- If your home is likely to flood, or if authorities tell you to evacuate, do so immediately and move to higher ground.
- Never walk, swim, or drive through flood waters or flooded roads.
- Stay away from areas where water levels can rise rapidly, like storm drains, culverts, creeks and streams.
- If you are trapped in a building, move to the highest floor and call 911. Go to the roof only if necessary.
- Do not go into any room where electrical cords or outlets are under water. Stay out of water that may have electricity in it!
- If your vehicle is trapped in rapidly moving water, stay inside. If water is rising inside the vehicle, move to the roof and signal for help.
In effect from Friday 04/17 6:27 PM CDT – Saturday 04/18 5:00 AM CDT
Issued by NWS Chicago IL
What
Flash flooding caused by excessive rainfall continues to be possible.
Where
Much of northern and central Illinois and extreme northwest Indiana.
When
Until 5 AM CDT Saturday.
Impacts
Creeks and streams may rise out of their banks. Ongoing river flooding may worsen. Flooding may occur in poor drainage and urban areas. Roads and streets may be flooded. Area creeks and streams are already elevated, increasing the risk of flooding due to additional rainfall.
Additional Details
- A line of thunderstorms, some capable of producing rainfall rates of up to 2 inches per hour, will move across the area this evening into the early overnight hours. Despite the expected relatively fast storm movement, anomalously high atmospheric moisture content will support high rainfall rates. In many areas, soil moisture remains very high, including near the Illinois-Wisconsin border where nearly saturated soils exist due to recent heavy rainfall. While many areas may see lighter accumulations less than 0.5 inches, soils will be very sensitive to rainfall. Areas near and downstream of heavy rainfall, particularly urban areas and locations in far northern Illinois, may see flash flooding and river flooding impacts, some locally significant. - http://www.weather.gov/safety/flood
What to do
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.
Areas impacted
- Winnebago
- Boone
- McHenry
- Lake
- Ogle
- Lee
- De Kalb
- Kane
- DuPage
- La Salle
- Kendall
- Grundy
- Kankakee
- Livingston
- Iroquois
- Ford
- Northern Cook
- Central Cook
- Southern Cook
- Northern Will
- Southern Will
- Eastern Will
- Lake
- Porter
- Newton
- Jasper
- Benton
Tips to stay safe
A Flood Watch means the area may experience a dangerous flooding event, and being prepared may save lives and property.
- Be aware of low-lying areas along your travel routes that are most likely to flood.
- Check your home’s emergency supplies, and make sure all members of the household know your emergency plan.
- Stay tuned for local weather updates on the situation as it develops.
If a Flood Warning is issued, it means that dangerous flooding is expected or already happening.
- Never walk, swim, or drive through flood waters or flooded roads.
- Stay away from areas where water levels can rise rapidly, like storm drains, culverts, creeks and streams.
If your home is likely to flood, or if authorities tell you to evacuate, do so immediately and move to higher ground.
In effect from Sunday 04/19 1:00 AM CDT – Tuesday 04/21 1:00 PM CDT
Issued by NWS Chicago IL
The National Weather Service in Chicago IL has issued a Flood Watch for the following rivers in Illinois
Illinois River at Ottawa affecting La Salle zone.
The Flood Watch is replaced by a River Flood Warning for the following rivers in Illinois
Illinois River at La Salle affecting La Salle, Bureau and Putnam zones.
For the Illinois River (Upper)...including Ottawa, La Salle... flooding is possible.
What
Flooding is possible.
Where
Illinois River from Heritage Harbor east of Ottawa downstream to Starved Rock Lock and Dam, including the Ottawa gauge.
When
From late Saturday night to early Tuesday afternoon.
Impacts
At 464.0 feet, Backwater causes the Fox River to reach bankfull near St. Elizabeth Medical Center in Ottawa.
Additional Details
- At 12:30 PM CDT Friday the stage was 461.6 feet. - Forecast...Flood stage may be reached early Sunday morning. - Flood stage is 463.0 feet. - http://www.weather.gov/safety/flood
What to do
A Flood Watch means water levels above flood stage are possible, but not yet certain, based upon the latest forecasts. Persons along rivers and streams in the watch area should monitor the latest forecasts and be prepared to take action should flooding develop.
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 this afternoon.
Areas impacted
- La Salle
Tips to stay safe
A Flood Watch means the area may experience a dangerous flooding event, and being prepared may save lives and property.
- Be aware of low-lying areas along your travel routes that are most likely to flood.
- Check your home’s emergency supplies, and make sure all members of the household know your emergency plan.
- Stay tuned for local weather updates on the situation as it develops.
If a Flood Warning is issued, it means that dangerous flooding is expected or already happening.
- Never walk, swim, or drive through flood waters or flooded roads.
- Stay away from areas where water levels can rise rapidly, like storm drains, culverts, creeks and streams.
If your home is likely to flood, or if authorities tell you to evacuate, do so immediately and move to higher ground.
Briefing
From the forecaster
Flooding Threat Tonight
Created by the NWS Chicago WFO
In addition to the severe weather, there is also a threat for flash flooding this evening. The greatest flooding threat is expected to be near the IL-WI line where greatest rainfall has occurred over the past five days, but localized flooding could occur anywhere storms train.
Seven-day weather risk overview
Daily weather risk summary
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