Advanced Electric Field Monitor
We use the BOLTEK EFM-100 Electric Field Monitor that detects lightning up to 30 miles away and
detects the conditions that precede a lightning strike. This is done by monitoring the electric charge
above and near our location and by watching the trends develop.
Electric fields develop wherever there is a difference in electric potential.
If the electric field gets high enough you can feel your hair stand on end
(if this happens outdoors during a thunderstorm crouch down with your feet together as you are about to be struck by lightning.)
An electric field is what attracts your hair to a charged comb or a charged balloon.
The electric charge contained in a thundercloud also generates an electric field. This field can be measured on the ground.
Electric field is measured in Volts per meter (3.3 feet)
The electric fields which accompany thunderstorms normally measure in the thousands of Volts per meter,
usually abbreviated to kV/m. Lightning is detected as a sudden change in the static electric field.