MeteoX rain radar bug or exceptional phenomenon?

[Christophe]

Everything is in the title, here is the picture of the rain radar of right now, is it a radar bug or a phenomenon quite exceptional, rare to see strange?



Of course I am talking about the rain circle of about 300km radius centered slightly west of Luxembourg ...

90% chance for the bug but the question is worth asking ...

Historical: http://www.meteox.fr/hist.aspx choose the 26 september, it started at 9: 45 this morning and finished at 12: 30 ...

If not bug it's very strange ...

[dirk pitt]

the same thing on another site (but does not the data come from the same source ???)

[dedeleco]

Unless I'm stuffy or blind, I do not see anything:

circle of rain about 300km radius centered west of Luxembourg ...

on the map !!

Lighter with Dirk pitt

May be local mists in the morning (near rivers at the bottom of the valley) that condense their humidity in a slight atmospheric depression ???

[Christophe]

Rohhh this deduced, glasses changes! There is a slight circle (not a disk like Pitt's) on the 1ere image ...

+ 1 for the common source ...

[dedeleco]

local mists in the morning (near rivers at the bottom of the valley) which condense their humidity in a slight atmospheric depression ???
which dissipate with the sun of the day.

[Christophe]

Stratus condensing? Ok I think the rain radar does not see the drizzle but the rain (from a certain intensity I guess, 2 or 3 drop it does not appear).

In any case, I have never seen such a perfect circle ... especially in such a large area.

Those who fly on the forum will surely have a more precise opinion on the question ...

[Gaston]

In any case, I have never seen such a perfect circle ... especially in such a large area.

In my opinion, this circle probably corresponds to a single radar (that of Avesne?), Which explains the circular shape.

So a problem of tuning, noise in range limit, failure of a filtering system ... or something like that.

[dedeleco]

Ok I think the rain radar does not see the drizzle but the rain (from a certain intensity I guess, 2 or 3 drop it does not appear).

The fog at ground level, (not stratus) are droplets of condensed water, small to stay in the air long and the radar measures the water by the absorption of the radar waves, whatever its form, big drops rain falling or fine fog long in the air, provided that the amount of water is significant in total in the air.
A thick morning haze at less than 300m from the soil at the bottom of the humid valley contains a lot of condensed water and is detected by the radar.

The radar must be full of clues to correct, but the limit is certainly fuzzy, between thick mist and wet night and rain !!!

[Christophe]

In my opinion, this circle probably corresponds to a single radar (that of Avesne?), Which explains the circular shape.

So a problem of tuning, noise in range limit, failure of a filtering system ... or something like that.

Yes I think the same. This is what I included in "bug" ... such a perfect circle is not natural!

On MeteoX (when there is a big disturbance), we can see very well the circular limit on the Atlantic of the radar zone.

[Capt_Maloche]

And where is the LHC compared to this map?

AH, no, he is at the level of Geneva, a pity