Guest Weblog: Ben Herman Of The University Of Arizona – Maximum Temperature Trends and the HO83

HO83 ASOS Hygrothermometer (temperature/dewpoint sensor) Note: This was originally posted on Dr. Roger Pielke Sr’s blog Climate Science at http://www.climatescience.org I’m reposting it here since we’ve had a number of posts on the HO83 thermometer inaccuracy and it’s impact on the surface temperature record. Ben Herman raises some very valid points. There is an issue with regards…

Inside the ASOS HO83 Temp/dewpoint sensor

HO83 ASOS Hygrothermometer (temperature/dewpoint sensor) Much has been written about problems with artificially high temperature readings due to the HO83 aspirated air temperature/dewpoint temperature sensor used on NOAA Automated Surface Observing Stations (ASOS). The most famous problem occurred in Tucson, AZ in the  mid 1980’s where a malfunctioning HO83 unit created dozens of new high…

Seattle’s climate instantly cools 1.5 degrees

This is interesting, and of course it goes hand-in-hand with what I have been saying for years. Scott Sistek, of KOMO News/Weather reports: ============================================================= For several years the thermometer at SeaTac airport has been reporting temperatures 1-3 degrees above surrounding areas. Instead, it seems the thermometer at Sea-Tac is finally back on track, reporting temperatures…

Connecticut’s new short lived all time high temperature record corrected – but was it ever a record at all?

The recent heat wave in the Midwest and the eastern United States has been characterized by all sorts of exaggerated claims. One even made it into Wikipedia as an “official” all time high record. From http://en.wikipedia.org/wiki/U.S._state_temperature_extremes Dr. Roy Spencer alerted me to a problem on Monday, and I did some preliminary investigation, confirming that yes…

Record highs? – NOAA staffers are beginning to doubt the accuracy of the measurement system

While Joe Romm squawks about record highs being “obscenely hot” over at Think-Climate Progress, there’s a quiet bit of questioning going on within NOAA about the veracity of the surface temperature measurements, particularly related to ASOS stations at airports, which have made up a significant number of recent record high temperatures in the USA in…

Misguided thinking: All time low temperature record for Illinois called into question by NWS citing lack of confidence in equipment. “ASOS better than AWOS”

ASOS (left) AWOS (right) – both at airports click for larger images People send me stuff. Last night I got an email from reader Andrew Schut that said: See public information statement below.  I’m perplexed. ASOS was put in for “aviation purposes” given its tolerances, yet we use it for climate purposes, why should AWOS…

Feeling the Heat, is it real or is it ASOS?

Guest post by Russ Steele (Note Russ was the very first volunteer for surfacestations.org, I’m traveling today, so I’ll comment later on this investigation. – Anthony) Feeling the Heat was published by Environment California a non-profit group a few weeks ago, claiming 2007 was the tenth warmest year on record and that the mountain west…

How not to measure temperature, part 60

A good number of official climate stations of record in the USHCN network used for climate studies are at airports. All have been converted to the automated ASOS systems, and the placement of these is often chosen to be away from the airport tarmac so that temperature and dewpoint readings aren’t biased. While climate monitoring…