Re: Record low temperatures follow snow in San Francisco

[Guest guest]

I'm sure the temperatures are averaging lower than the sensors are showing. Audits have revealed that over 50% of sensor placed by environmental scientists, etc., in the last 20 years or so have been improperly placed and so give higher readings than they should. Other audits show that the number of sensors has be cut by over half and computers estimate the temperatures in between widely spaced sensors. For example: in South America, there is a sensor in the Amazon lowlands that is used to extrapolate the temperatures in parts of the Andes Mountains hundreds of miles away. Now, there used to be sensors in the mountains but they were among the thousands taken offline.

All of that probably goes a long way toward explaining why the satellite data and ground sensors don't match up very well, with ground sensors counting the temperature as higher than the satellites do.

In a message dated 2/26/2011 5:22:14 P.M. Eastern Standard Time, no_reply writes:

Record low temperatures follow snow in San Francisco

[Guest guest]

I would assume the badly placed sensors are near infrastructure,

such as power and a data network (phone or internet), which tends to

lend itself better to urban areas? The sensors may be going offline

due to greater reliance on satellite data, as sensors onboard

satellites gain in resolution, accuracy, and precision, and thus end

up being more cost effective over an area than a comparable number

of sensors of appropriate density and quality.

I'm sure the temperatures are averaging lower than

the sensors are showing. Audits have revealed that

over 50% of sensor placed by environmental scientists,

etc., in the last 20 years or so have been improperly

placed and so give higher readings than they should.

Other audits show that the number of sensors has be

cut by over half and computers estimate the

temperatures in between widely spaced sensors. For

example: in South America, there is a sensor in the

Amazon lowlands that is used to extrapolate the

temperatures in parts of the Andes Mountains hundreds

of miles away. Now, there used to be sensors in the

mountains but they were among the thousands

taken offline.

All of that probably goes a long way toward

explaining why the satellite data and ground sensors

don't match up very well, with ground sensors counting

the temperature as higher than the satellites do.

In a message dated 2/26/2011 5:22:14 P.M. Eastern

Standard Time, no_reply writes:

Record low temperatures follow snow in San

Francisco

[Guest guest]

" I would assume the badly placed sensors are near infrastructure, such as power

and a data network (phone or internet), which tends to lend itself better to

urban areas? The sensors may be going offline due to greater reliance on

satellite data, as sensors onboard satellites gain in resolution, accuracy, and

precision, and thus end up being more cost effective over an area than a

comparable number of sensors of appropriate density and quality. "

They also put temperaure sensors in the middle of blacktop parking lots instead

of above regular ground. Black absorbs heat, so you can have blacktop be tens of

degrees higher than the grass nearby.

Administrator

[Guest guest]

" I would assume the badly placed sensors are near infrastructure, such as power

and a data network (phone or internet), which tends to lend itself better to

urban areas? The sensors may be going offline due to greater reliance on

satellite data, as sensors onboard satellites gain in resolution, accuracy, and

precision, and thus end up being more cost effective over an area than a

comparable number of sensors of appropriate density and quality. "

They also put temperaure sensors in the middle of blacktop parking lots instead

of above regular ground. Black absorbs heat, so you can have blacktop be tens of

degrees higher than the grass nearby.

Administrator