Here he was introduced to field research under Howard Bluestein, chasing supercells and tornadoes, and learning about thunderstorm structure and processes.

[2] Rasmussen became a research meteorologist at the National Severe Storms Laboratory (NSSL) and then the Cooperative Institute for Mesoscale Meteorological Studies (CIMMS).

After the study of squall lines his interest returned to supercells from the microphysical aspects of cloud particles to mesoscale environments modulating storm behavior.

This work remains supported by the National Science Foundation (NSF) and he consults for NSSL and CIMMS, private meteorological companies, and other entities.

[7] In 2015 Rasmussen moved back to Norman, where he continues this aforementioned work and serves as Program Manager for the VORTEX-SE project.