Case studies

Storms, as Calchis recorded them

Each storm case study is built from what the platform recorded while the storm happened: every National Hurricane Center advisory, every Weather Service watch and warning by state and by FEMA region, and Calchis’s forecasts set against what followed. They start themselves when a storm first puts US states under a tropical watch or warning, and grow as the record does.

2026 season

• Hurricane Isaias (2026)5 states under watch or warning

Field reports · tornadoes

Every tornado the Weather Service surveyed, against the warnings in effect when it touched down.

• Tornadoes of October 202626 surveyed

Replays

• Hurricane Milton, replayed: three triggers, three outcomes2024 · parametric trigger evaluation