Category Archives: UHI

UHI – worse than we thought

Remember when I measured the UHI in Reno, NV? It seems the normally alarmist “Climate Central” is just now getting around to recognizing UHI, but of course, they have to put in the obligatory disclaimer that it cannot possibly contribute … Continue reading

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Posted in UHI | 68 Comments

Something Detroit has in abundance – UHI

Detroit gets a lot of negative press these days, mainly because it has become a poster child for badly managed cities and decline, but it does seem to have UHI going for it and is no stranger to downtown heat … Continue reading

Posted in GHCN, Temperature, UHI, Weather_stations | 43 Comments

Macro, Meso, and Micro Climates: The Importance of Trees in Urban Climates

Guest essay by Dr Tim Ball I think that I shall never see a poem lovely as a tree, -Joyce Kilmer Is dishwater dull? Naturalists with microscopes have told me that it teems with quiet life. – G. K. Chesterton. … Continue reading

Posted in UHI | 36 Comments

Why would climate skeptics hold a conference in HOT Las Vegas?

That is a question that I’m sure is on a lot of people’s minds as they wonder if they should attend. It seems like the sort of thing warmists would do – go someplace hot, talk about how hot it … Continue reading

Posted in Climate data, Climate News, records, UHI, Weather | 69 Comments

UHI and heat related mortality

From Arizona State University Study links urbanization and future heat-related mortality TEMPE, Ariz. – Phoenix stands at a parched crossroads. Global scale climate change is forecast to bring hotter summers and more extreme heat to the Valley, but regional urbanization … Continue reading

Posted in Economy-health, UHI | 64 Comments

Record Daily Temperatures and UHI in the USA

By Paul Homewood https://www2.ucar.edu/atmosnews/news/1036/record-high-temperatures-far-outpace-record-lows-across-us Every so often, the hoary old chestnut of record daily temperatures is wheeled out, as evidence of global warming. The above chart is from the NCAR study by Gerard Meehl in 2009, and the NCAR Press … Continue reading

Posted in Climate data, records, UHI, Weather | 60 Comments

Yes, but what about all that extra UHI that water vapor will cause?

Not to mention the water pollution…from Springer Select: To curb China’s haze and air pollution, use water New geoengineering research suggests pollution-control measures inspired by watering a garden A new idea to cut back on air pollution: spray water into … Continue reading

Posted in Aerosols, Geoengineering, UHI | 39 Comments

Unwarranted Temperature Adjustments and Al Gore’s Unwarranted Call for Intellectual Tyranny

Guest essay by Jim Steele, Director emeritus Sierra Nevada Field Campus, San Francisco State University For researchers like myself examining the effect of local microclimates on the ecology of local wildlife, the change in the global average is an absolutely … Continue reading

Posted in Al Gore, Climate data, PDO, UHI, Weather_stations | Tagged , , | 184 Comments

Does your weather station get the wind? How station siting compromises temperature measurements via wind issues

Guest essay by Bob Fernley-Jones Well Melbourne (Oz) sure does, (and we are the butt of a few intercity jokes, a polite one being; we can have “four seasons all in one day”). The following graphic (source) of an extreme … Continue reading

Posted in UHI, Weather_stations | Tagged , , , , | 22 Comments

Analysis Of UHI In South Korea

Guest essay by Paul Homewood Seoul I ran a post earlier about UHI in South Korea. A study by two Korean scientists found that over half of the warming reported in Korea since 1954 was a result of UHI. In … Continue reading

Posted in UHI | 23 Comments

New paper by Ross McKitrick – ‘temperature data strongly affected by local population growth’

Ross McKitrick writes: I give a demonstration of why the Parker and BEST analyses don’t disprove the evidence of contamination of temperature data, and outline what it would likely take to settle the issue properly. Cheers, Ross ENCOMPASSING TESTS OF … Continue reading

Posted in Climate data, UHI | Tagged , , , , , , , | 46 Comments

Is Fighting Global Warming the Solution to Water Shortages in Malawi (or Elsewhere)?

Guest essay by E. Calvin Beisner In late May two evangelical environmentalists, recently returned from visiting Malawi, published articles in which they said poor Malawians are suffering from reduced rainfall caused by manmade global warming. Jonathan Merritt wrote for Religion … Continue reading

Posted in Agriculture, Land use land cover change, UHI | Tagged , , , , , , , , | 90 Comments

Heat-related deaths in Manhattan projected to rise – except reality shows them going down in the USA

Only one problem, an NIH study shows that thanks to air conditioning and other factors, including better education programs about heat waves, heat related deaths are actually going down in the USA. From Davis et al, Changing Heat-Related Mortality in … Continue reading

Posted in Economy-health, heat wave, UHI | Tagged , , , | 16 Comments

The Chinese demonstrate that UHI has a real and essential effect on regional climate change

Study finds that urbanization has considerable influence on the regional climate change, they even blame proximity to air-conditioning as a factor. Press release from Science China Press (full paper follows) Urbanization and surface warming in eastern China A recent study … Continue reading

Posted in Land use land cover change, UHI | Tagged , , , , , , , | 33 Comments

Climate Craziness of the week – with the physical signature of UHI staring them right in the face, Mann & Borenstein go with their ‘gut’ instincts

Some people wonder if Michael Mann is simply an activist masquerading as a scientist, this lends credence to that idea. I wonder if Dr. Mann has ever visited weather stations in China to understand what is going on there? I … Continue reading

Posted in Climate Craziness of the Week, UHI | Tagged , , , , | 85 Comments

Berkeley Earth, Very Rural and Not

Jet exhaust as climate forcing Guest Post by Willis Eschenbach The good folks over at the Berkeley Earth Surface Temperature project have published their paper about urban heat islands. It’s called “Influence of Urban Heating on the Global Temperature Land … Continue reading

Posted in Land use land cover change, Surfacestations paper, UHI | Tagged , , , , , , , | 257 Comments

California to quantify UHI statewide

From the if we can quantify it we’ll figure out a way to tax it department comes this short press release (h/t Kakatoa) The Governor’s Office of Planning and Research is joining with Cal/EPA and several other State agencies on … Continue reading

Posted in UHI | Tagged , , | 69 Comments

Preliminary comments on Hausfather et al 2013

There’s a new paper out today, highlighted at RealClimate by Hausfather et al titled Quantifying the Effect of Urbanization on U.S. Historical Climatology Network Temperature Records and published (in press) in JGR Atmospheres. I recommend everyone go have a look … Continue reading

Posted in Climate data, UHI, Watts et al 2012 | Tagged , , , | 106 Comments

Station bias – an old problem

A number of readers have commented about the story from Sunday about NOAA’s experiment at Oak Ridge Laboratory to determine the warming effects of siting suggesting that the experiment was long overdue. many found it surprising that it has taken … Continue reading

Posted in Surfacestations paper, UHI | Tagged , , , , , | 41 Comments

Via experiment, NOAA establishes a fact about station siting: ‘nighttime temperatures are indeed higher closer to the laboratory’

WUWT readers may recall that I wrote about this experiment being performed at Oak Ridge national Laboratory to test the issues related to station siting that I have long written about. NOAA’s ‘Janus moment’ – while claiming ‘The American public … Continue reading

Posted in Surfacestations paper, UHI | Tagged , , | 182 Comments

Unique paper looks for natural factors in station data–shows significant probabilities of natural signal

Since we have been paying a lot of attention to the surface record given the recent revelations surrounding the adjustments to data and NOAA’s release of the State of the Climate  Report claiming that the USA had the hottest year … Continue reading

Posted in Climate data, UHI | Tagged , , , , , , | 51 Comments

Earth at night – wildfires in Australia

From NASA – Wildfires Light Up Western Australia (nothing unusual here, it happens every year) A stunning video of the Earth at night follows. Careful observers of the new “Black Marble” images of Earth at night released this week by … Continue reading

Posted in Earth, Energy, UHI | Tagged , , , | 60 Comments

The heat is on: the UK SurfaceStations effort

They say “imitation is the sincerest form of flattery”, so color me flattered. I’ve been remiss in writing about this effort by Roger Tattersall (aka Tallbloke) and his colleague Tim Channon, but a tip from WUWT reader David Schofield brought … Continue reading

Posted in GHCN, UHI, Weather_stations | Tagged , , , | 102 Comments

Measuring UHI on a bike produces a new paper

While NCDC’s Dr. Thomas Peterson tries to ignore UHI, from Hans Von Storch at Die Klimazwiebel (h/t to Jos de Laat) we learn that many other people are actively measuring it. WUWT reader may remember my “do it yourself UHI … Continue reading

Posted in UHI | Tagged , , , , , | 58 Comments

PBS airs special on green rooftops, cites NCDC’s Thomas Peterson, who fumbles the UHI ball

From PBS last night: From Rooftop to Alleyway, Chicago Fights Extreme Urban Heat With Greener Ideas One of Chicago’s most beautiful and hidden gardens is located on top of City Hall, part of an effort to ‘green’ roofs in order … Continue reading

Posted in UHI | Tagged , , , , , , | 48 Comments

A new paper showing how UHI and energy consumption are linked to long-term temperature change in China

Dr. Roger Pielke Sr. highlighted this major new paper in JGR yesterday, I consider it important as it relates to the works I’m doing on station siting. The key points of the paper are supportive of what I’ve  been saying … Continue reading

Posted in GHCN, Temperature, UHI, Watts et al 2012, Weather_stations | Tagged , , , , | 33 Comments

Law of unintended consequences bites the ‘white roof UHI solution’ – causes reduced rainfall

From Arizona State University Researchers emphasize evaluation of tradeoffs in battling urban heat island Urbanization will increase average temperatures in Arizona’s Sun Corridor and white roofs can combat that, but not without consequences for the region’s hydroclimate TEMPE, Ariz. – … Continue reading

Posted in UHI | Tagged , , , | 90 Comments

Recent paper demonstrates relationship between temperature and population density in the UHI of New Delhi

This gives credence to Dr. Roy Spencer’s population adjusted ISH surface temperature data for the USA Impact of population density on the surface temperature and micro-climate of Delhi Javed Mallick1 and Atiqur Rahman2,* 1Department of Civil Engineering, King Khalid University, … Continue reading

Posted in Climate data, UHI | Tagged , , , , | 50 Comments

Never before published paper on UHI and siting – Goodridge 1987

Plus answers to yesterday’s Fun puzzle: Name these official stations. Given that California Governor Jerry Brown has recently setup a website at the governor’s office basically telling skeptics to “shut up” I thought this would be a good time to … Continue reading

Posted in Climate data, ENSO, James Hansen, UHI, Weather_stations | Tagged , , , , , , , | 104 Comments

Little Ice Age Thermometers- Historic variations in temperatures Part 3 -BEST confirms extended period of warming.

Guest post by Tony Brown This short paper is a preliminary examination of BEST data to 1753, as compared to the Central England Temperature Record (CET) to 1660 (instrumental record) and 1538 (Extended by Tony Brown using thousands of contemporary … Continue reading

Posted in Berkeley Earth Surface Temperature, Climate data, UHI | Tagged , , , , , , | 68 Comments

Important New Paper on the Nocturnal Boundary Layer, Mixing, and Radiative Forcing as it applies to GHCN weather stations

From Dr. Roger Pielke Sr. comes word of an important new paper that shows how the air near the ground (boundary layer) is highly affected by sensitive nighttime dynamics, which show up in the Tmin of weather station data (GHCN … Continue reading

Posted in GHCN, Surfacestations paper, UHI, Weather_stations | Tagged , , , , , , , , | 65 Comments

More modeling madness: increased temperature ‘may’ cause more violent thunderstorms – but other studies show what they missed

From Tel Aviv University, another science press release with “could and may” qualifiers:  Climate Change May Lead to Fewer — But More Violent — Thunderstorms Number of flash floods and forest fires could increase with temperature, says TAU researcher Researchers … Continue reading

Posted in ENSO, Land use land cover change, Modeling, modification, thunderstorms, UHI, Weather | Tagged , , , , , | 62 Comments

Impact on temperature measurement: Cities expand by area equal to France, Germany and Spain combined in less than 20 years

Dr. Roger Pielke Sr. points out on his weblog this interesting press release from IGBP (from March 2012) that we all apparently missed until now. One of the points worth noting is that there were fewer than 20 cities of … Continue reading

Posted in Land use land cover change, UHI | Tagged , , , , , | 54 Comments

The UHI’s of Texas are upon you

Joe D’Aleo suggested earlier today that I take a look at some of the data from NCDC’s web page called “US climate at a glance“. This page allows comparisons of the actual data not anomalies used in the NCDC USHCN … Continue reading

Posted in Climate data, UHI | Tagged , , , | 105 Comments

UAH continental US Temperature for May 2012: +1.26 deg. C

by Roy W. Spencer, Ph. D. The U.S. lower-48 surface temperature anomaly from my population density-adjusted (PDAT) dataset was 1.26 deg. C above the 1973-2012 average for May 2012, with a 1973-2012 linear warming trend of +0.14 deg. C/decade (click … Continue reading

Posted in Climate data, UHI | 38 Comments