Risk-assessment baseline packet. County area 13067. Release 2026-10, data as of 2026-09-28.
Plan clock
Plan 111823 approved 2026-08-25, pending adoption here; not yet eligible
- Plan
- Cobb County (FEMA plan 111823), pending adoption here
- Approved
- 2026-08-25 by FEMA; not yet adopted here
- Expires
- 2031-08-24 once adopted
- As of
- 2026-09-28
- Update underway
- FEMA tracker shows a plan approvable pending adoption
Not yet eligible: adopt the approved plan.
Not yet eligible: adopt the approved plan.
Map group: Lapsed, not yet adopted or never covered.
What the packet contains
Sections in FEMA checklist order. Each heading names the review item its tables support; whether the item is satisfied is decided by the plan and its reviewers. Full tables are in the downloads above. GEMA template per-hazard letters (A to I) next to the FEMA item. No letter is documented for repetitive loss; place B2-c per your GEMA template.
Supports B1-a Hazards GEMA letter A
14 of the 18 National Risk Index hazards apply here; omission evidence is shown only where NRI rates a hazard "Not Applicable", no federal declaration names it and Storm Events has no record of it since 1996.
Highest expected annual loss (NRI, modeled): Inland Flooding, Tornado and Cold Wave.
Also check locally (not covered by NRI): 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 and expansive soils.
Check your state hazard mitigation plan's hazard list for this county; explain any hazard you drop.
Supports B1-b Location GEMA letter B
- Avalanche, Coastal Flooding, Earthquake, Hurricane, Landslide, Tornado, Tsunami, Volcanic Activity and Wildfire: Census tract rating counts from the National Risk Index tract table (see B1-f). Tract maps and place names are not in this packet.
- Cold Wave, Drought, Hail, Heat Wave, Ice Storm, Lightning, Strong Wind and Winter Weather: Affects the whole planning area; national data do not distinguish locations within the county. Confirm locally.
- 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.
Supports B1-c Extent GEMA letter B
Storm Events records for 13 of 20 hazard groups, with the scale, observed range and worst recorded event for each; the others say local data required.
- Hail: 4 in hail, 1998-05-07; same size also recorded on 1997-04-22
- Thunderstorm Wind: 78 kt (90 mph) estimated gust, Thunderstorm Wind, 2008-02-26
- Tornado: F4 tornado, 1992-11-22, 13 mi path length (records before 1996 may include the whole path; rating and listing come from the county where the tornado began), 867 yd wide, $25,000,000 property; crops not recorded (1992 dollars), 34 direct injuries
Supports B1-d Previous occurrences GEMA letter B
19 federal declaration rows for this area (15 counted incidents), each with type, dates and county Public Assistance dollars.
Plan 111823 was approved by FEMA on 2026-08-25 but is not yet adopted here, so no since-plan counts are given.
6 statewide declarations listed separately.
Hazards with no recorded events are stated as such (6 of 18).
Storm Events history: 744 records (notable ones in the PDF, all of them in the Excel file).
Supports B1-e Probability GEMA letter B
FEMA annualized frequency (modeled) for each hazard, with a descriptor from a scale defined in the packet.
- Highly likely: Hail, Lightning and Strong Wind
- Likely: Cold Wave, Drought, Heat Wave, Ice Storm, Inland Flooding, Landslide, Tornado and Winter Weather
- Possible: Hurricane
Historical frequency by intensity band (tornado, hail, wind): 9 bands from Storm Events.
Supports B1-f Variation across the planning area GEMA letter F
Range of census tract risk scores within the area for 18 hazards (186 tracts; rated tracts only).
7 member jurisdictions: plan clock, repeat-flood count, Public Assistance dollars and event records naming the place (starter, confirm locally).
Supports B2-a, B2-b Assets and impacts GEMA letter C/D
Local data required
County-level starter. The plan must describe impacts for each participant and its own assets.
Plan 111823 was approved by FEMA on 2026-08-25 but is not yet adopted here, so no since-plan counts are given.
Checklist of what to gather locally: Critical facilities and lifelines per hazard; A problem statement per participant per hazard; Changes in development in hazard-prone areas since the last approval, or a statement of none (E1-a); Future assets.
- The 2024 Georgia Hazard Mitigation Strategy says the State provides a Level 2 Hazus analysis as part of each county's plan update, and GMIS holds critical-facility data. Use them for B2-a and B2-b.
- The 2024 Georgia Hazard Mitigation Strategy notes that FEMA restricted access to repetitive-loss property data, so GMIS repetitive-loss reports may not be available; ask GEMA/HS or the state NFIP coordinator for the current list.
- Rows are also labeled with the GEMA template per-hazard section letter (A to I).
Supports B2-a Context GEMA letter I
Population 764,915; building value $171,927,859,036 and agriculture value $4,869,641 (total, not at risk).
National Risk Index rating Relatively High; social vulnerability Very Low; community resilience Relatively Low.
Supports B2-c Repetitive loss
Repetitive-loss properties, FMA definition (44 CFR 77.2): 16 repetitive loss, 33 severe repetitive loss. NFIP insurance definition: 132 and 21.
Mitigated 20; insured 62; NFIP data as of 2026-08-02. Counts by occupancy and for each member community are in the packet.