LMA lightning sources are often shown using a format similar to the one shown below:




Intracloud discharge VHF sources located using a 10 station array installed in the region surrounding Langmuir Laboratory in New Mexico.  Langmuir laboratory is located at over 10,000 ft. altitude.



Intracloud activity leading up to a cloud-to-ground discharge.

Both figures are adapted from Rison et al., (1999).