Extreme Weather: Maps and Trends

by Dan Chavas · Professor · Purdue University, Department of Earth, Atmospheric, and Planetary Sciences

Interactive maps and explorers for extreme weather. Many things a work in progress, new updates expected regularly. Email me if there is a feature you would like to see added!

Tropical Cyclones

Historical Event Viewer
Hurricane best-track points coloured by category with wind-swath outlines along the U.S. East Coast

tcviewer.org: IBTrACS TC Track & Wind Footprint Map Explorerexternal site

Maps of all global tropical cyclones: individual storm, day in history, month in history, and date range
Historical Trends
Global track-density map on a 5-degree grid with tropical-cyclone maxima over the western Pacific and eastern Pacific

Climatology & Trends — 5° grid

Paired climatology and trend maps on a 5° global grid, each with its zonal profile alongside, plus annual, seasonal and month-by-month series. Track density, storm count, ACE, intensity, central pressure and storm size, by basin, 1980–2025 from IBTrACS. Click a basin to zoom in.

Severe Weather wind, hail, tornado, derecho, freezing rain

Historical Event Viewer
Derecho wind-gust reports strung west to east across the Midwest, coloured by gust speed

Historical Severe Weather Events

Maps of any severe thunderstorm and derecho day from the historical record
Historical Trends
County-level U.S. hail climatology, deep red through the central Plains fading to pale yellow at the coasts

Climatology & Trends — county level

Paired climatology and trend maps at U.S. county resolution, with annual and month-by-month series. Hail, tornado, thunderstorm wind, freezing rain and peak wind.
The same U.S. hail climatology binned into coarse 2-degree grid squares

Climatology & Trends — 2° grid

The same paired maps binned into a regular 2° grid.