Indef Ceiling Vis 700 AGL?
#2
Gets Weekends Off
Joined APC: Mar 2020
Posts: 399
When does VV come into play? Usually with fog. Fog is a cloud that touches the ground, so technically you’re in the cloud, so the ceiling can’t be above you, right? So instead of a ceiling, they say how far up you can see from the ground (vertical vis).
Curious...Where’d you get that from? Is it a decoded METAR?
#3
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Joined APC: Jul 2016
Posts: 75
Thanks for the explanation.
It’s a decoded METAR. I came across it one day and it was the first time I had seen that so I decoded it, but was still unable to visualize the conditions it could exist under. I was also not used to fog being coded that was. I always thought it was simply FG.
Now that you’ve posted it, I do recall seeing VV007 as part of the string.
It’s a decoded METAR. I came across it one day and it was the first time I had seen that so I decoded it, but was still unable to visualize the conditions it could exist under. I was also not used to fog being coded that was. I always thought it was simply FG.
Now that you’ve posted it, I do recall seeing VV007 as part of the string.
#4
What was the whole METAR? There’s going to be visibility report, the present weather and and the sky condition. So in your example maybe something like 1/8 SM FG VV007. So you can only see 1/8 of a mile horizontally and then looking up you can only see 700 feet. Fog is the most likely weather condition, I guess really heavy rain, smoke or dust could also lead to that type of report.
#5
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Joined APC: Jul 2016
Posts: 75
I only copied the part that I couldn’t understand, but I don’t remember anything else tacked on to the VV007, I think that’s why it threw me off. If I come across a similar example from my local airport, I’ll post it again. I always like learning more about METARS.
#6
So before they redid the metars in 2004 the code would have been W007. That a W, not two V’s. That was decoded as indefinite. After 2004, they changed it to VV, or vertical visibility which means roughly the same thing; hard to tell, but this is what I think the ceiling is. I wonder if the code to English decoder in use in your example is combining the two or was in use prior to 2004 and was updated.
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