NWS SPC Mesoscale Discussion
Glendora Random Weather Fact
LIGHTNING SAFETY
LIGHTNING SAFETY - "How far away was that lightning strike? To estimate the distance between you and a lightning flash, use the "Flash to Bang" method: If you observe lightning, count the number of seconds until you hear thunder. Divide the number of seconds by five to get the distance in miles. Example: If you see lightning and it takes 10 seconds before you hear the thunder, then the lightning is 2 miles away from you (10 divided by 5 = 2 miles)."
Courtesy of the NWS





