Turlock got our second good dousing of rain today with just over 0.91" falling between 4:30am and 3:00pm. Although the street drains were not ready to simultaneously handle the rain and huge amounts of sycamore, elm, ash and pistache leaves, this was by no means a drought buster.
I did a bit of rooting around on the Western Regional Climate Center to dig-up the average annual rainfall for Turlock and to get a better understanding of the precipitation deficit we're currently running. It turns out Turlock averages 11.83" per year and our three year rain deficit from this drought is somewhere near 12" (based on the best case scenario from the graph below).
To better put the information into perspective I tried to teach myself some Google Sheet skills and make a few graphs using data from my fairly reliable weather station. It took a few tries, but here's what I've ended up with. The first graph shows Turlock's rain amounts for each day it has rained this water year. It should be noted that our water year begins on October 1st and ends on September 30th to better coincide with the onset of our rainy season. After today's rain, Turlock has had nine rainy days for a total of 2.82 inches. You can hover your mouse over the different colors on the charts to see how much rain fell on each day.
The graph that I will use quite often in my classes is below. It's a comparison of several precipitation numbers for Turlock including an average year of 11.83" (orange), the three year precipitation deficit of 12" (rusty red), and the current tally of 2014-15 rains (optimistic green). By adding the deficit to the average water year I have concluded that Turlock would need to get somewhere in the neighborhood of 24" to even start thinking that the drought is over. As one can see, our 2.82" for the year is still a pittance compared to the 24" pillar of drought that Turlock needs to overcome in order to quench its thirst. And it is quite unlikely.
Ryan J Hollister - Geoscience & EnviroSci Educator, Avid hiker, Landscape photographer, WildLink Club Advisor, Central Valley Advocate.