Where the data comes from

National Hurricane Center (NHC, NOAA)

Storm position, strength, forecast track and cone, wind fields, coastal watches and warnings, and each storm's public advisory, for the Atlantic and the eastern Pacific. This is public information from the US government. Watches and warnings for each country are issued by its government and published by the NHC.

We also use the NHC Tropical Weather Discussion, issued every 6 hours: tropical waves, the Intertropical Convergence Zone and monsoon trough, areas of thunderstorms, fronts and gale warnings at sea.

nhc.noaa.gov

El Niño and La Niña (NOAA CPC)

The official ENSO status comes from the monthly NOAA Climate Prediction Center discussion. Typical effects by region are general tendencies described by NOAA and regional weather services, not forecasts.

cpc.ncep.noaa.gov

Rain forecast (MET Norway)

Rain and temperature for the next days by city are an automatic computer-model forecast from the Norwegian Meteorological Institute. It is not an official alert: rain and flood watches and warnings come from the National Weather Service and each island's weather service.

Data from MET Norway under the CC BY 4.0 license.

What we do

We explain official products in plain English, convert units, and measure on the official forecast the closest distance and time of passage for each city. We make no forecasts or alerts of our own.

We check the NHC every 10 minutes. If anything here differs from your local officials, follow your local officials.