Jax Water Damage Hub

Sources and Methods: Jacksonville Data

Each fact on Jax Water Damage Hub links back to the agency or provider it came from. This page lists them by topic, shows how the computed numbers are produced, and carries the statements the data providers require.

Updated

Jacksonville: storms, utility and flood office

Florida Statutes and licensing

Published rules behind the estimator

Data services

How the numbers are produced

  • Weather now. The latest Jacksonville International Airport (KJAX) observation, the National Weather Service forecast for City Hall's grid point, and alerts for Duval County zones FLZ125,FLZ325,FLZ425,FLC031. The site refreshes observations and alerts about every 15 minutes and the forecast about every hour.
  • Rain against normal. ACIS daily totals for the Jacksonville Area record (downtown, then Jacksonville International Airport), added up for yesterday, the past 7 and 30 days and the month so far, next to ACIS 1991-2020 normals for the same days. A trace counts as zero.
  • Heavy rain days. Every day from September 12, 1871 to November 11, 2026 whose rain reached the 99th percentile of all daily readings (2.04 in.), ranked so that 1 is the wettest. Days with no rain reading (10) are skipped.
  • Freeze nights. Days in the same record with a low at or below 20°F, the temperature the ICC article (citing IBHS) gives for unprotected pipes, counted by winter from July to June.
  • Flood claims by ZIP. All NFIP claims whose reported ZIP is one of Jacksonville's 31 residential ZIP codes. Paid means building plus contents payments. Under 5 claims shows as "fewer than 5".
  • Age of homes. Median year built (table B25035) and the share of housing units built before 1980 (table B25034) for each ZIP Code Tabulation Area, from the Census Bureau's ACS 5-year 2020-2024 summary file. The citywide share weights each ZIP by its housing units. ZIP Code Tabulation Areas approximate ZIP codes, and the estimates have margins of error.
  • Hand check. Before publishing, the claim count for ZIP 32207 was queried directly from OpenFEMA and matched the pulled file (577 claims), and the median year built for 32207 in the raw Census file (1964, margin 3 years) matched too.

Queries behind the data pull (November 12, 2026)

  • ACIS StnData, full daily record: https://data.rcc-acis.org/StnData
  • ACIS StnData, 1991-2020 monthly precipitation normals: https://data.rcc-acis.org/StnData
  • OpenFEMA NFIP Redacted Claims v3, one query per ZIP: https://www.fema.gov/api/open/v3/NfipClaims?$filter=reportedZipCode eq '<ZIP>'&$select=reportedZipCode,yearOfLoss,dateOfLoss,amountPaidOnBuildingClaim,amountPaidOnContentsClaim,occupancyType&$top=10000
  • Census ACS 5-year 2020-2024 summary file, tables B25034 and B25035 (ZCTA rows): https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25034.dat and https://www2.census.gov/programs-surveys/acs/summary_file/2024/table-based-SF/data/5YRData/acsdt5y2024-b25035.dat

Required statements

  • Weather observations, forecasts and alerts are from the National Weather Service (weather.gov).
  • Daily station history is from the Applied Climate Information System (ACIS) run by the NOAA Regional Climate Centers.
  • River readings are from the U.S. Geological Survey Water Data API. USGS labels recent readings Provisional, which means they may still be revised.
  • This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
  • The NFIP claims dataset is not intended to be an official federal report, and should not be considered an official federal report.
  • Home age figures are U.S. Census Bureau American Community Survey 5-year estimates. The Census Bureau has not endorsed or certified this site.

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