Using satellite sensors, scientists from University of Wisconsin-Madison’s Cooperative Institute for Meteorological Satellite Studies revealed that their satellite-based Visible Infrared Imaging Radiometer Suite (VIIRS) sensors showed lightning streaks, gravity waves, mesovortices inside the eye.
They saw it before Lawin landfell on Cagayan province.
According to the U.S. National Aeronautics and Space Administration (NASA), atmospheric gravity waves form when buoyancy pushes air up, and gravity pulls it back down. Studies have shown that tropical cyclones generate gravity waves.
Mesovortices are rotating bodies of air found inside storms and the eyewall of tropical cyclones.
Super typhoon Lawin made landfall in Peñablanca, Cagayan last 11 p.m. on Wednesday, according to PAGASA.
The super typhoon has a massive 800-kilometer diameter and is expected to cross the provinces of Apayao and Ilocos Norte, before exiting the Philippine area of responsibility Thursday evening.
Cagayan, Isabela, Kalinga, Apayao, Northern Abra and Ilocos Norte are under storm signal number 5, the first time PAGASA issued such signal.