Inaccurate "feels like" temp?

Tempest Owners
1

Station up and running…seems all good so far with exception of the feels like temp. It seems to be following real temp. Any ideas folks?

2

I’m giving mine a couple weeks to adapt and calibrate.

1 Like
3

Yes, give your station a couple of weeks for calibrations to be applied.

2 Likes
4

Feels like won’t change until the temperature hits 80°F.

2 Likes
5

Thanks folks didn’t realize there was a calibration period

1 Like
6

this has nothing to do with calibration. Heat index/feels like temp is only valid above 27 degrees (80 F) AND a relative humidity of 40% or higher. If not, heat index equals the current tempelanure.

3 Likes
7

Huh…weathernetwork always shows the" feels like" no matter the temp?

8

At the top of the page, under the API heading is a menu item for Derived metrics. It describes how the “feels like” temp is figured.

1 Like
9

I’ll address the Elephant in the room. Why do you think the feels like is inaccurate?

1 Like
10

The weatherflow definition of feels like, requires the mentioned conditions. If those are not met, it does show a feels like value, but that value is equal to the normal value.

1 Like
11

Well as I say, using weathernetwork, it shows a different “feels” most of the time. Example yest was it was 72 out but weathernetwork said feels like 79.@ 84% humidity. And it did , felt wet and heavy out . Tempest show same temp and feels like. Right now now WN, 70f/72 feels/74%—tempest 68f/68 feels/74%.

12

That’s understandable. WeatherFlow uses a formula from weather.gov for heat index and wind chill.

You can find more information here: https://weatherflow.github.io/SmartWeather/api/derived-metric-formulas.html#sea-level-pressure

2 Likes
13

There is no “official” way in the USA to calculate a feels like temperature. Some try to factor in wind speed into the normal heat/humidity factor such as what the UK Met Office does https://blog.metoffice.gov.uk/2012/02/15/what-is-feels-like-temperature/ .

2 Likes
14

The Weather Network uses Humidex (a Canadian invention which is actually unit-less, it is not actually a feels like "temperature) to report “feels like” if I am not mistaken (see https://www.theweathernetwork.com/news/articles/humidex-vs-heat-index-whats-the-difference/10243 ). In many US outlets, “feels like” for hotter conditions is the Heat Index . Both are based only on a combination of heat/humidity. AccuWeather has their own index “RealFeel” which is proprietary which also includes more than just heat/humidity and also is reported for all temperatures, not just warmer conditions. And, there are other fomulations used around the world as well

So, very hard to compare two “feels like” numbers without knowing how each has been derived.

3 Likes
15

In the summer, just give me temp and dew point.
In the winter, just give me temp and the wind speed.

1 Like
16

There is also the Steadman Apparent Temperature that tries to incorporate the effect of temperature, humidity and wind speed into a single Feels Like temperature. It is the approach favoured by the Australian Bureau of Meteorology (http://media.bom.gov.au/social/blog/1153/apparent-feels-like-temperature/)

1 Like
17

Yeah. The Heat Index actually came from Steadman’s work, but, for some reason, NWS chose the simpler Heat Index rather than the more comprehensive Steadman Index. NWS is also starting to pay attention to WBGT (Wet Bulb Globe Temperature) which uses temperature, humidity, wind speed, sun angle and cloud cover (solar radiation). See WetBulb Globe Temperature, et al. (you may have guess, this is an area where I have done just a little research :slight_smile: ).

2 Likes
18

Great link thank you! Learned something today, had no idea there was a difference.