How not to measure temperature, part 28 - Eureka!

6 08 2007

Well, I found it. Eureka that is, but what I found was rather depressing. I visited the climate stations of record both old and new at Eureka, California on July 30th and I can’t decide which site is more out of compliance with sitings standards.

The original location was on the 4th story roof of the main Post office in downtown Eureka and had been there since before 1900:
EurekaPostOffice.JPG
The weather station was on the elevated scaffold above the roof, it is still visible today.

But the station was moved to the National Weather Service Office on Woodley Island in 1994. They had a chance then to do a good site setup and to adhere to published siting standards, but alas, no such luck:
EurekaNWSOffice.JPG

The site at the Eureka Weather Service Office has several problems: Asphalt parking lot within 100 feet, buildings within 100 feet, and a line of large shade trees about 25 feet to the west and north, making significant shade for about 1/3 to 1/2 of the day, depending on the time of year, plus wind shelter. Plus there is the concrete under the Stevenson Screen, the 3 concrete pillars for rain gauges that can act as heat sinks, and the crushed rock around the station site. “Crushed rock” isn’t generally found in Humboldt county as a natural surface, so the surface under the weather station isn’t representative of the surrounding area.

EurekaNWSOffice2.JPG

A complete photo essay is available here on www.surfacestations.org

If the NWS doesn’t see fit to make the sites at their own offices comply with published site standards, is it any wonder that so many of the other climate stations of record are so far out of compliance?