Assertion: cyclone's pressure | /r/IsA | a weather bomb
Facets:
Source sentences:
text: To be classified as a weather bomb, the central pressure of a low-pressure system must drop at least 24 millibars within 24 hours.
text: To be classified as a weather bomb, or having undergone bombogenesis or "bombing out," the central pressure of a low-pressure system must drop at least 24 millibars within 24 hours.