Grayson County Disaster Risk

Grayson County has a FEMA National Risk Index rating of Relatively Low, placing it in the 80th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.

Grayson County is evaluated for five major natural hazard types: tornado (93th percentile), wildfire (86th percentile), flooding (80th percentile), earthquake (67th percentile), hurricane (53th percentile). The highest-risk hazard is tornado at the 93th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.

Grayson County's composite risk percentile is 80th, compared to the Texas state average of 49th percentile. The state's overall risk rating is Relatively Low. This means Grayson County faces higher natural disaster risk than the typical county in Texas.

Yes, Grayson County's tornado risk is at the 93th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Grayson County is at the 80th percentile.

FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.

Grayson County's composite risk score of 80th percentile is above the Texas state average of 49th percentile. This elevated risk is driven by tornado exposure (93th percentile), along with wildfire and flooding and earthquake and hurricane risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.