Lake County, IL

Supports FEMA checklist item B1-a Hazard identification

16 of the 18 National Risk Index hazards apply here.

Not applicable to this county per NRI, with no federal declaration and no Storm Events record since 1996: avalanche and volcanic activity. That is the evidence for leaving them out of the plan.

Highest expected annual loss (NRI, modeled): Inland Flooding, Tornado and Cold Wave.

Not covered by NRI (local data needed): dam failure (incl. upstream dams); levee failure; flash flood as its own subtype; ice jams; debris flows; erosion (riverine and coastal); land subsidence and sinkholes; expansive soils.

The state hazard mitigation plan also lists hazards for this county; FEMA asks the plan to explain any hazard it leaves out.

Supports FEMA checklist item B1-b Hazard location

• Coastal Flooding and Inland Flooding: the FEMA Flood Insurance Rate Map (FIRM) is the required location source for flooding. See the FEMA Flood Map Service Center (https://msc.fema.gov) for this county.
• Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather: affects the whole county; national data give no location within it.
• Earthquake, Hurricane, Landslide, Tornado, Tsunami and Wildfire vary within the county; the packet lists the highest-rated census tracts for each.

Supports FEMA checklist item B1-c Hazard extent

Storm Events records for 13 of the 20 NOAA event-type groups mapped to the 18 hazards, with the scale, observed range and worst recorded event for each; the others say which local data are needed.

Worst recorded tornado, hail and thunderstorm wind (the three event types on record since the 1950s; the packet has every group):

• Hail: 2.75 in hail, 1967-07-18
• Thunderstorm Wind: 78 kt (90 mph) estimated gust, Thunderstorm Wind, 2011-06-30
• Tornado: F4 tornado, 1967-04-21, 4.5 mi path length (whole path, pre-1996), 150 yd wide, $2,500,000 property (pre-1996 NOAA value, recorded in damage ranges); crops not recorded (1967 dollars), 1 direct death, 97 direct injuries

Supports FEMA checklist item B1-d Previous occurrences

Federal declarations for this area: 17 declarations covering 14 separate hazard incidents counted in this packet; each with type, dates and county Public Assistance dollars.

New since the last plan (approved 2023-07-05): none.

2 statewide declarations listed separately.

Hazards with no Storm Events record and no federal declaration are stated as such (7 of 18).

Storm Events history: 835 records (notable ones in the PDF, all of them in the Excel file).

Supports FEMA checklist item B1-e Probability of future events

FEMA annualized frequency (modeled) for each hazard, with a descriptor from a scale defined in the packet.

• Highly likely: Hail, Lightning, Strong Wind and Winter Weather
• Likely: Cold Wave, Drought, Heat Wave, Ice Storm, Inland Flooding and Tornado
• Possible: Coastal Flooding, Landslide and Wildfire
• Unlikely: Earthquake and Hurricane

Historical frequency by intensity band (tornado, hail, wind): 9 bands from Storm Events.

Supports FEMA checklist item B1-f Hazards that vary across jurisdictions

Range of census tract risk scores within the area for 16 of the 18 hazards (159 tracts; rated tracts only).

55 jurisdictions: plan clock, repeat-flood count, Public Assistance dollars and event records naming the place (starting figures from federal data).

County Public Assistance in B1-d also includes applicants filed under the county that are not matched to a jurisdiction row here (for example county offices and boards filed under their own names, such as a sheriff's office or a conservation board, and state agencies, special districts and nonprofits), so the jurisdiction rows add up to less.

Supports FEMA checklist items B2-a and B2-b Vulnerability and potential impacts

The packet's table gives county-level starting figures; the plan describes impacts for each jurisdiction and its own assets.

Storm Events damage since 2023-07-05: $0 in county-coded records (93 records); $0 reported for the zone (30 zone records). Data through 2026-06-30; nominal dollars.

Local data needed

To gather:

• Critical facilities and lifelines per hazard
• A problem statement per jurisdiction per hazard
• Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a)
• Future assets

Supports FEMA checklist item B2-a Vulnerability (county context)

Population 713,483; building value $185,453,695,377 and agriculture value $50,298,348 (total, not at risk).

National Risk Index rating Relatively High; social vulnerability Very Low; community resilience Relatively High.

Supports FEMA checklist item B2-c Repetitive loss properties

Repetitive-loss properties, FMA definition (44 CFR 77.2): 7 repetitive loss, 25 severe repetitive loss. NFIP insurance definition: 195 and 15.

Mitigated 7; insured 77; NFIP data as of 2026-08-02. Counts by occupancy group and for each jurisdiction are in the packet.