Jefferson County IL in Illinois faces tornado / flash flooding risk across its 571 square mile area. Mount Vernon serves this southern Illinois county with Rend Lake and I-57/64 junction. Jefferson serves as the county seat and regional emergency coordination hub.
// Preparedness Recommendations
- Evacuation routes inland should be identified in advance.
- Store at least 72 hours of food and water.
- Elevate critical belongings above flood level.
- Have backup power ready in case of grid failure.
// Recommended Supplies
Essential gear for power outages, severe weather, and emergency situations in your area.
- Emergency Food Supplies
- Water Filtration & Storage
- Backup Generator
- Solar Backup Power
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// Risk Intelligence
| Threat Score | 5 / 10 Low Risk |
| Primary Hazard | Tornado / Flash Flooding |
| Secondary Hazard | Mississippi River Flooding |
| FEMA Flood Zone | Low |
| Federally Declared Disasters | 6 |
| Last Major Event | 2019 Tornado |
| Event Frequency | Annual |
// Emergency Operations
| Emergency Mgmt Phone | (618) 244-8010 |
| Emergency Shelters | 2 designated facilities |
| Evacuation Routes | State and US highways |
// County Profile
| County | Jefferson County IL |
| State | Illinois (IL) |
| Population | 38 |
| Area | 571 sq miles |
| FEMA Region | Low |
// Other Illinois Counties
Cook County IL
Tornado / Severe Storm
6/10
Moderate
Will County IL
Tornado / Severe Storm
6/10
Moderate
St. Clair County IL
Tornado / Flash Flooding
6/10
Moderate
Madison County IL
Tornado / Mississippi River Flooding
6/10
Moderate
Ford County IL
Tornado / Flash Flooding
5/10
Low
Mercer County IL
Tornado / Flash Flooding
5/10
Low