Mention the word precipitation to a Floridian …
And the first thing that comes to mind is “rain.”
|Evapotranspiration outpaces rainfall during south Florida’s dry season|
But rain isn’t the only show in town dictating how the swamp’s water responds.
There’s also evapotranspiration which – starting in spring – starts to switch on to full gear.
The black bar in the graph shows what I call net precipitation as computed week after week from May 2008 to present. The background blue shows recorded weekly rainfall as a basin-wide average for the swamp and the background red shows an estimate of evapotranspiration over the same week.
A week of no rain means a seven days of unfettered evapotranspiration.
String a couple of those together during the spring turns precipitation on its head.
What looks like blue sky and sun to most …
is just rain falling upside down to me.