RHYB is a Regional hybrid blocking detection method that requires both an amplitude criterion on the geopotential height anomaly and a flow reversal criterion. Rather than applying a single amplitude threshold across the Northern Hemisphere, it sets the threshold from the local geopotential height variability at each grid point and for each month, so that blocking is detected consistently even over the low-variability Eurasian interior and in summer.
This design follows Noh et al. (2026); the data provided here extend it with a monthly adjustment so that the method can be applied in all seasons. 

Noh, H., Ku, HY., Sung, MK. et al. Uncovering missing Eurasian blocking events and their robust role in East Asian winter extremes: a region-dependent detection approach. npj Clim Atmos Sci 9, 144 (2026). https://doi.org/10.1038/s41612-026-01415-7