Sunday, I was on the extreme East End of Galveston. A thunderstorm rumbled off to the southwest, but only a few drops of rain fell at that location. Later as I traveled towards the central part of the city, the streets were flooded in some areas to curb level and a CoCoRaHS observer (a volunteer precipitation observation network) in that area reported 0.96” of rain. Meanwhile, just a couple of miles further west, the official reporting station at Scholes Field monitored but a trace of rain from the same event.
Rainfall amounts usually reflect two general varieties of precipitation. The general rains, where most locales in a region receive reasonably similar amounts of precipitation in any given event and scattered rains, where rainfall totals can vary widely even within a few blocks.