HRRR — High-Resolution Rapid Refresh NWP Forecast

Hourly 3-km CONUS NWP forecast with 18-hour horizon (48-hour on 4 cycles per day), updated every hour. Convection-allowing physics; key input for short-range storm and fire-weather forecasts.

Provider	NOAA NCEP / GSL
Delivery mode	stream
CNR score	80
Cadence	PT1H
Origin	https://rapidrefresh.noaa.gov/hrrr/