Lightning strike risk degree derivation device and lightning strike risk degree display system

A lightning strike risk degree derivation device that derives a lightning strike risk degree for each of a plurality of regions divided by latitude and longitude into a mesh shape, the lightning strike risk degree derivation device comprising:

• an echo intensity derivation unit that derives an altitude distribution of echo intensity in a predetermined altitude range for each of the plurality of regions using observation data acquired from meteorological radar;
• an air temperature derivation unit that derives an altitude distribution of air temperature in the predetermined altitude range for each of the plurality of regions using observation data acquired from a meteorological observation device;
• a feature amount derivation unit that derives a feature amount to be used to derive a lightning strike risk degree;
• and
• a lightning strike risk degree derivation unit that derives the lightning strike risk degree using the feature amount, wherein
• the feature amount derivation unit derives integrated echo intensity that is an integrated value of the echo intensity in at least part of the predetermined altitude range for each of the plurality of regions, and
• the lightning strike risk degree derivation unit derives an altitude distribution of the lightning strike risk degree for each of the plurality of regions using the integrated echo intensity and the altitude distribution of the air temperature.