Precipitation & Flooding

Rain falling and splashes in puddles on residential street with a car in the background

Floods are one of the deadliest of all weather-related hazards in the United States.

We Track That

We partner with the Climate and Health Program to host data from several sources to track extreme precipitation and flooding in the United States. These data can help communities prepare for and respond to weather-related events.

Types of Data

The Tracking Network provides data about extreme precipitation and the vulnerabilities that increase risk for health effects related to those extreme weather events.

Historical Precipitation
This indicator allows you to look at the number of extreme precipitation days and the monthly estimates of precipitation by county and census tract for every state except Alaska and Hawaii.

Precipitation & Flood Projections
This indicator shows projected precipitation data including number of precipitation days, annual precipitation intensity, and ratio of rain to snow. Data are available at the county level for every state except Alaska and Hawaii.

Precipitation & Flood Vulnerability and Preparedness
This indicator provides county level data on the Federal Emergency Management Agency (FEMA) designated Special Flood Hazard Area including number of square miles within the area, the number of people living in the area, and the number of housing units within the area. These data can be used to estimate the number of people and housing units at risk from flooding.

Data Highlight
Tracking Network's Data Explorer tool: U.S. Map with layer options

Add layers to any map.
Click on the gear icon to select layers: surface smoke, current radar, transportation noise, active Atlantic cyclones. Try it!

Data in Action

Tracking precipitation and flooding in a standard way over time can help us

  • determine trends over time and place,
  • evaluate extreme weather events at the national level, while allowing for comparisons across states,
  • better understand the possible health effects and risks to specific groups of people,
  • identify conditions that make people vulnerable during extreme weather events, and
  • design interventions and communication efforts for at-risk populations.

Learn More

Explore Precipitation & Flooding Data
Data Explorer
screenshot of Tracking Network data explorer tool

Create custom data visualizations, save, & share results

Quick Reports
Asthma Quick Reports web page screenshot

View data in simple charts

API graphic text

Access machine-readable data

Page last reviewed: October 21, 2020