The U.S. National Hurricane Center issues advisories for tropical storms and hurricanes in the Atlantic basin.
October 07, 2025
high
institutional
Operational role of the National Hurricane Center in tracking and communicating tropical cyclone information
A hurricane's strength is measured by its maximum sustained wind speed and by its central (sea level) pressure measured in millibars; hurricanes typically become stronger as their central pressure decreases, according to the U.S. National Oceanic and Atmospheric Administration (NOAA).
high
conceptual
Basic meteorological metrics and the inverse relationship between central pressure and storm intensity as stated by NOAA.
The National Oceanic and Atmospheric Administration (NOAA) uses a geomagnetic storm scale with categories G1 through G5; G4 is classified as "severe" and G5 is classified as "extreme".
high
technical
NOAA categorizes geomagnetic storm severity to indicate potential impacts on technology and infrastructure.
NOAA's radio blackout classification labels an R3 solar flare as "strong," indicating it can cause major disruptions to high-frequency (HF) radio on the sunlit side of Earth and can cause low-frequency navigation signal issues.
high
technical
The R-scale is used to characterize the potential impacts of solar flares on radio communications and navigation.