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at least hundreds of lines
DATA BASED ON 181800Z
VALID 190000Z FOR USE 2000-0300Z. TEMPS NEG ABV 24000
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
FAT 9900 9900+08 2508+00 2614-05 2823-18 2832-31 284645 275156 275865
SAC 9900 2207+07 2205+01 2911-04 2917-19 2829-31 274346 274556 275166
SFO 9900 2207+07 2307+02 2610-03 2516-18 2620-31 253545 264056 254467
Originally posted by weedwhacker
reply to post by 1Veritas
I went to the NOAA aviation weather data for winds aloft.
aviationweather.gov...
Looking at your area, there is this:
DATA BASED ON 181800Z
VALID 190000Z FOR USE 2000-0300Z. TEMPS NEG ABV 24000
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
FAT 9900 9900+08 2508+00 2614-05 2823-18 2832-31 284645 275156 275865
SAC 9900 2207+07 2205+01 2911-04 2917-19 2829-31 274346 274556 275166
SFO 9900 2207+07 2307+02 2610-03 2516-18 2620-31 253545 264056 254467
I cut out many other stations reporting, to reduce clutter.
What are left, as you see, are 'FAT' (Fresno, CA) 'SAC' (Sacramento) and 'SFO' (San Francisco).
How to 'read' it???
It's tabular, and my copy/paste may not come through to ATS in the proper format, so please bear with me...
First, based on date/time 181800Z. That is the 18th of the month, @1800 GMT. (1000 PST)
'SAC' is closest to Tahoe/Reno, so let's look at that one...
We'll look at the last three, to represent the levels where contrails generally form --- 30,000 34,000 and 39,000 feet.
We see the data there:
At 30,000 feet -- 274346
At 34,000 feet -- 274556
At 39,000 feet -- 275166
To decode, let's look at "274346"
That tells me that the winds, at that altitude (Flight Level) at 1000 PST were blowing FROM a 'true' direction of ~270 degrees (From the West, basically) AT 43 knots.
The '46' is the temperature, in degrees Celsius. The '-' sign is left off, because it is obvious that at those heights the temp is negative...
SO....the winds aloft that would be affecting the contrails, as they 'lingered', were about 43 to 51 knots. (~~49-59 MPH)
When you are looking up at them, from the ground, and they are only moving that fast....do you see my point, yet??
(Hint: It's a BIG sky!)
They do not appear to be moving no one line ever got close to another they all stayed evenly spaced the whole time. I did see certain bright lines in some areas of the lines that had a slight wave to them inside of the lines. These wavey portions never moved from where they were.
Originally posted by azzllin
reply to post by traditionaldrummer
The OP merely reported what they have seen, perhaps in the hope that other people in or close to where they are may be seeing them also, I didn't see anywhere them asking for it to be debated, just asking and reporting.
I don't see anywhere that they are making unbelievable claims, just making and sharing an observation.