Naked Science Forum

Non Life Sciences => Technology => Topic started by: syhprum on 21/07/2019 19:39:05

Title: Why are the temperature readings abnormally high in Southern Portugal?
Post by: syhprum on 21/07/2019 19:39:05
when I check the temperatures for the region around Faro in Southern Portugal on the weather satellite pictures they tend to read up to 10C higher than what the BBC weather service tells me they should be.
Comparing temperatures across most of Europe they tend to coincide within 1C but they are consistently wrong in this area any ideas ?
Title: Re: Why are the temperature readings abnormally high in Southern Portugal?
Post by: alancalverd on 21/07/2019 20:54:21
Check your data by googling "METAR FARO". Look for the "allmetsat" website. This gives you the most recent (METAR)and "best forecast" (TAF) data for all the world's commercial airports.

Check also for "obvious" errors - US reports will be in Fahrenheit, satellite infrared data may be visible bare ground (standard met report is air at 1.5 m above ground in the shade), and just to make it interesting, local time in Portugal is an hour behind the rest of Europe!

Then check for other anomalies. You'd expect Faro to be cooler than, say, Seville during the day and warmer at night, for instance.

And remember that "the region around" a coastal airport is going to be quite a bit hotter than the airport during the day if there's no cloud. The BBC forecast may well be based on airport data.
Title: Re: Why are the temperature readings abnormally high in Southern Portugal?
Post by: syhprum on 22/07/2019 10:05:20
The METAR FARO reports seem to be closer to what I observe on the weather satellite pictures as you say some of the variation may be due to the terrain.
Many thanks
I am always shocked when I see temperatures reported in Fahrenheit my American friends report that it is going to be 50 degrees and I shudder at the thought of being cooked but when I get there they are reaching for their coats.
Title: Re: Why are the temperature readings abnormally high in Southern Portugal?
Post by: evan_au on 23/07/2019 01:42:21
When we talk about a hot "30 Degrees" (in Celsius), our Fahrenheit-using friends think it sounds cold....
Title: Re: Why are the temperature readings abnormally high in Southern Portugal?
Post by: alancalverd on 23/07/2019 08:29:36
I've never heard an Aussie describe 30C as "hot"! Strewth, mate, the country's going soft ...... Ashes under threat ......