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Hurricane Irma, the most intense hurricane observed in the Atlantic in the last decade, approached the west coast of Florida on September 10th, 2017. The map above animates the hurricane's path, cumulative precipitation, and its impact on river gage height. Every six hours, the data are refreshed to show the most up-to-date information. Hydrographs in the right panel show normalized gage height at U.S. Geological Survey (USGS) gaging stations that are forecasted to or have exceeded National Weather Service flood stage. Variation in the shape of the hydrographs is due to a number of factors that impact the effect of precipitation on flow, including: stream size, storm-surge, reservoir operations, and other local conditions. The USGS has many more permanent gaging stations across the country; less than 1% are represented in this visualization. The USGS also collects additional information with Short-Term Network gages . Visit USGS's Hurricane Irma page to learn more about how the agency prepared for and measured Irma's impact. For more information on hurricanes, visit the National Hurricane Center's website .

Data Sources

Gage Height: U.S. Geological Survey National Water Information System. Time series of gage height at selected sites impacted by the storm are shown through time, ordered by latitude and normalized to site-specific maximum gage height observed over the duration of the hurricane.

Precipitation: National Weather Service Environmental Modeling Center National Center for Environmental Prediction Stage IV precipitation analysis, aggregated according to Blodgett (2013).

Storm Track: National Oceanic and Atmospheric Administration National Hurricane Center Preliminary Best Track for Hurricane Irma.