The forecast track is the predicted path of the storm’s center. The cone of uncertainty around it shows where the center is likely to go — historically the center stays inside the cone about two times out of three. The cone widens with time because forecasts are less certain further out.
The most important caveat: the cone shows the center’s probable track, not the storm’s size or where its impacts will be felt. Damaging wind, rain and surge routinely extend far outside the cone. “Outside the cone” does not mean safe.
Hazards are not symmetric. Storm surge is usually worst to the right of the track (in the Northern Hemisphere), rainfall flooding can be heaviest where the storm slows or stalls, and tornadoes often spin up in the outer rainbands — sometimes hundreds of kilometers from the center.
Watch the official watches and warnings tied to your location rather than just the line on the map. A hurricane warning means hurricane conditions are expected within 36 hours — time to have already acted, not to start planning.