Ok to make things clear in my weather reports I thought of this, defining the three stages of track wetness..
Stage 1: anything below first line.
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Stage 2: anything between first and second lines.
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Stage 3: anything between the second and the top including the blue standing water line.
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Maybe we all can adjust to this as a reporting standard?
You have absolutely right about stages of rain using the lines .
The "problem " is the stage two, which can be little above first line and you may survive on non wet tyres especially when track starts dry out .
Its a condition that i call light rain to dry which means no change tyres is nesesery.
After a point, lets say close to 2/3 its a rain situation that usually someone start " crawling " to the pits for a change if is out on dry tyres.
Passing the second line with the blue mark on top , usually is heavy rain or torrential rain .
I can't keep so much details except conditions that worth to memo .
For example, 4 continues laps with rain which isn't very common at all.
Or heavy rain on 6th lap only ,etc.
Since i run there " all my life " 😂 i have see ALL kinds of weather could possibly imagine.
Even the blue mark close to the very last line but that's never happened after 1.30 something update at least till now.
My verdict from memo ,was that during the end of the month and usually before an update the weather was more rainy with heavy and torrential rain falling.
Might be a coincidence ? I don't know.
Certainly they are weird conditions from time to time .
Usually rainy conditions starts ath the end of 2nd lap or after starting the 3rd lap depending on the car you drive , if is fast , very fast or not .
But isn't very common to face heavy rain starting 5th lap or ending the 4th one for example.
Anyway , at my report i want to make clear if or not needed to change tyres from dry to wets ( no matter what type , personally i never use wets ,only Intermediates ) and how often heavy rain hits the track .
Best way to observe for me, is to use a car with non stop needed.
Isn't what we call fast , but definitely can cover the most of lost time that someone spend at the pits for fuel or tyres or both .
Sometimes the weather radar looks like : ohh shi...p am F..#$@... up now ( F from fried ) but what passes over the track isn't so terrible .
PS
Your reports are crystal clear and up to the point.
Thanks mate.