Climate Risk Summary
Zip Code 77843, Risk Profile
The primary drivers of climate-related financial risk in Unincorporated, TX (77843) are Cold Wave, Tornado, and Heat Wave. This area also faces an unusually high intensity for Lightning, Strong Wind, Ice Storm, and Winter Weather compared to national averages.
Understanding the Dollars
Expected Annual Loss (EAL) is a statistical average of property damage for this entire zip code over a standard year across all properties.
- / It represents the "average cost" rather than a guaranteed yearly bill.
- / It can be used to compare the relative risk from different hazards and across different neighborhoods.
Primary Risks
Cold Wave
Expected Annual Loss for Zip Code 77843
Very High compared to US average
Tornado
Expected Annual Loss for Zip Code 77843
Very High compared to US average
Heat Wave
Expected Annual Loss for Zip Code 77843
Relatively High compared to US average
Zip Code Risk Map
Financial Risk Inventory
Recommended Mitigation Strategies
Recommended investments to protect your property value and reduce insurance liability based on your local risk profile.
Cold Wave Mitigation
General property maintenance and insurance review recommended.
Tornado Mitigation
Reinforce garage doors and consider a FEMA-approved safe room or storm cellar.
Heat Wave Mitigation
Ensure attic insulation is R-49+ and consider a dual-fuel backup generator for AC.
Lightning Mitigation
General property maintenance and insurance review recommended.
Strong Wind Mitigation
Trim large trees back from the roofline and reinforce roof-to-wall connectors (hurricane straps).
Ice Storm Mitigation
Install a 10kWh backup battery system to keep pipes from freezing during grid failure.
Winter Weather Mitigation
General property maintenance and insurance review recommended.
Methodology and Sources
Spatial Aggregation
Our "Atlas" risk scores are derived using a population-weighted spatial join. Because US Zip Codes and Census Tracts do not share perfectly aligned boundaries, a simple geographic average would be misleading. We utilize US Census Block Group population statistics to identify where residents actually live within a Zip Code. We then intersect these points with FEMA National Risk Index (NRI) hazard data to calculate a weighted exposure score.
Financial Projections (EAL)
Expected Annual Loss (EAL) estimates the average economic impact of natural hazards in dollars per year. This calculation incorporates three components: Exposure (the value of structures and agriculture), Annualized Frequency (historical probability), and Historic Loss Ratio (vulnerability of the area).
Primary Data Sources
- FEMA National Risk IndexHazard frequency and loss data (v1.20.0 - Dec 2025)
- U.S. Census BureauTIGER/Line 2025 Shapefiles & Decennial Population