Month: March 2021

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What Your Rain Gauge Says About You

The measuring tube from an official CoCoRAHS (Community Collaborative Rain, Hail and Snow Network) rain gauge. There’s nothing in it.

To answer the question implicit in the title: I really have no idea.

But your rain gauge, be it an expensive electronic home weather station variety for which you’ve shelled out many hundreds of dollars or a humble plastic tube that you read manually, will tell you one thing for sure this winter in California: It’s been much drier than normal throughout our rainy season, and it’s dry now.

So far, our backyard gauge has caught 6.83 inches of rain since last July 1 (which is the “rainfall year” that used to be the standard for the National Weather Service in California; a few years ago, the agency switched to the “water year,” which runs from Oct. 1 through Sept. 30. For what it’s worth, I recorded exactly one one-hundredth of an inch (.01 inch) from last July 1 through Sept. 30; the Berkeley normal for that three months totals .31 inch).

Where was I? Right — 6.83 inches of rain since last July 1. The Berkeley “normal” for July 1 through March 8, as calculated for the “official” Berkeley station on the University of California campus, is 21.49 inches. One way to look at that: We’re about 15 inches short of our “normal” wet season rainfall. Another way: We’ve gotten just 31.8 percent of that “normal” precipitation.

I’d love to be able to compare my numbers with that station on campus, which has been keeping records since 1893. But I can’t right now. The Department of Geography employee in charge of the weather station and sending data to the public National Centers for Environmental Information database retired sometime in the last few months, and the most recent available numbers from that station are from last September. I’m told that the later data will be forthcoming … soon.

(Much later: The grad student in charge of collecting the UC Berkeley did get back to me after this was posted. The rainfall at the campus station totaled 7.99 inches at the time this post was published.)

Since the UC Berkeley info isn’t available, I’ve checked to see what other nearby CoCoRAHS (Community Cooperative Rain, Hail and Snow Network) rain watchers have recorded and compared those to the official Downtown San Francisco record for the season.

One gauge, 1.4 miles to the northwest in Albany, has recorded 6.99 inches since July 1 (.16 inch more than my gauge); another, 1.6 miles to the southwest in South Berkeley, has measured 6.39 inches (.44 less than mine). And San Francisco’s Downtown station, which has the longest continuous rainfall record on the West Coast — going back to the summer of 1849 — has picked up all of 7.41 inches since last July 1, or 39 percent of normal.

A look at the California-Nevada River Forecast Center makes it clear that our local percentages of normal — figures in the 30 to 40 percent range — are pretty typical across our slice of Northern California:

Percentage of “normal” seasonal rainfall recorded from Oct. 1, 2020, through March 8, 2021, by way of the California-Nevada River Forecast Center.

One other observation for now, by way of Jan Null, a former National Weather Service forecast who works as a consulting meteorologist. As he noted last week, California is in its second very dry winter in a row and we have a recent historical parallel, from 2013, that we can use to measure advancing drought effects across the state:

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Journal of Avian Reproductive Technique and Behavior, Mourning Dove Edition

A mourning dove, with freshly laid egg. On a fence. In the open.

There’s lots of evidence that mourning doves know what they’re doing when they try to reproduce. The Cornell Ornithology Lab says the worldwide breeding population is 120 million. Most of those birds, about 100 million, spend at least part of the year in the United States (where a vast number, perhaps 20 million, are shot by hunters each year). A smaller number — we’ve seen as many as eight at a time — spend at least part of the year in our backyard.

That having been said, as a non-expert, I’ve seen mourning doves do some things as part of their apparent nesting behavior that makes it look like this species doesn’t really have its own future in mind. For instance, we’ve seen a pair of doves that looked like they were determined to build a nest on a telephone line; at least that’s how I interpreted them trying to get twigs and strands of grass to stay in place on a piece of cable about as big around as your pointing finger.

And then there’s the example above. There has been some obviously amorous dove-on-dove activity in the backyard for the last week or so. This morning, Kate saw a pair nestled together on the side fence in the backyard. One of them, we’ll guess it’s a female, started to waggle her tail back and forth. And a few minutes later, we spotted it: an egg laid right out in the open on the two-by-four that serves as the fence’s top rail. The bird shown in the picture is the one we were guessing was a male; the female had sidled off down the fence a ways. They just kind of left it sitting there in the open, and then flew off when I was in the yard.

I figured it was only a matter of time before a) they came back to incubate the egg on the very exposed non-nest or b) a crow, jay or squirrel realized that a delicacy awaited and grabbed the egg. I went out to get more of a close-up before nature took its course.

A mourning dove’s egg. It’s just a little smaller than a pingpong ball.

A while later, a breeze came up and blew the egg a couple of feet along the top of the fence. Then the crow showed up. One pecked at it, then left it alone, which made me wonder if the egg had already been hollowed out. But it was still intact. Immediately after my inspection, the crow came back, speared the egg with its beak, and carried it over to a neighbor’s roof, where it ate the egg whole.