Questions tagged [asos]

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4 votes
1 answer
304 views

What does "half of the horizon circle" means?

The definition of Prevailing Visibility is: "Prevailing visibility is the horizontal distance over which objects or bright lights can be seen and identified over at least half of the horizon ...
mka's user avatar
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0 votes
1 answer
433 views

What is Tendency of RVR?

What does tendency of RVR (Runway Visual Range) mean and why down and up have the same values? This is from AWOS(Automated Weather Observing System)
mka's user avatar
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5 votes
1 answer
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What does AO2A in the remarks of a METAR mean?

I am familiar with AO2 in the METAR remarks as described in this answer, which means the station is automated and has a precipitation discriminator. I have noticed sometimes there is AO2A in the ...
Orienteer's user avatar
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25 votes
3 answers
4k views

Why would ASOS have a caution for Low Density Altitude?

I did my initial training in a high altitude area, where it got pretty hot in the summer, so I'm not at all surprised when I hear an ASOS announce: Caution: Density Altitude (a few thousand above ...
abelenky's user avatar
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13 votes
1 answer
14k views

What is the difference between the various automated airport weather observing systems?

Automated airport weather observations can be produced by several types of equipment: AWOS-A, AWOS-1, AWOS-2, AWOS-3, and ASOS are the ones I've seen mentioned. What are the differences between these ...
jrdioko's user avatar
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