Start with the National Hurricane Center, which has lots of different maps of Hurricane Matthew’s predicted path, weather warnings, rainfall potential and so forth. See also maps from Weather Underground.

Google’s Crisis Map includes evacuation resources—Red Cross shelters, evacuation routes, traffic data—in addition to storm track and precipitation information.

Matthew has already struck southwest Haiti; the Humanitarian OSM Team has put out a call for crisis mappers on the following projects: buildings in Nippes; road network in Grand’Anse and Sud.

Wind maps from Windytv and EarthWindMap visualize the wind patterns of Matthew and, further out in the Atlantic, Nicole.

Hurricane imagery from NOAA’s GOES East satellite. NASA Earth Observatory has imagery of Matthew’s path toward Florida.

[Dave Smith/Maps Mania/NASA Earth/NOAA Satellites]

With the Haiti earthquake, he had a chance to put everything he’d been thinking about into practice. He and some friends and colleagues began pulling information from social media—Twitter, Facebook, YouTube videos—and added it to a base map to start to get a picture of the damage in Haiti. They plotted points on the map in red dots, indicating pharmacies that were open, which ones did and didn’t have medicines, which roads were blocked, where people were trapped under rubble and needed help.

As the days went on, the effort attracted thousands of volunteers from 40 countries around the world, all wrangling tweets, text messages, videos, emails, Facebook posts and other messages. A special toll-free number was set up for people in Haiti to send text messages about their conditions and whereabouts. Meanwhile, Meier and his team in the U.S., including members of Haitian diaspora, worked around the clock, funneling a flood of information into a constantly evolving map.

[Caitlin Dempsey]