HRRR has wind animations blowing from low to high pressure
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First off, wonderful website.
But this was a bit crazy...
With HRRR selected the wind appears to be spiraling out from 2 areas of low pressure and converging into a high (on the W side of the screenshot. Similar problem in the far NW part of the domain. The low on the east side on the screenshot off of Southeast Alaska displays the expected behavior. Looking at the Lower 48 I don't see anything out of whack either. No change when selecting different time periods. When I change to any of the other models the wind field shifts, and the animated tracers cross the isobars from high to low as they should.
I upgraded to latest Firefox but no change. -
Yes it’s a bit strange. Same behavior with HRRR and NAM in their Alaska domain, while ECMWF and GFS show normal wind directions entering the low pressure center and exiting the high pressure center.
Over USA territory HRRR and NAM seems to show correct wind directions around Lows and Highs.
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@idefix37
You are right the NAM is doing it too though not to the extent.
Here's the graphic from NOAA which looks normal.
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@jiminak Thanks for letting us know. I can confirm there is something fishy going on and some transformation probably messes up the wind vectors when they are too far to the north.
I'll investigate further -
@Filip_K Any luck with this? It seems to be a problem far west more than far north.
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@jiminak I wasn't able to figure out what is wrong. The source grib data contain the same values we're displaying. I'll have to dig into the projections more
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@Filip_K
It is still wrong. Compare ECMWF and HRRR wind direction around a Low.
The normal way (ECMWF) is the wind entering into the Low area.
The wrong way (HRRR) is the wind exiting out of the Low area.
At first I thought about a possible relationship with the fact that this area is beyond the antimeridian (180°), but it does not seem to be the cause of this anomaly.
Finally I think it is due to a wrong sign, positive or negative, of the u and v vectors component of Wind. Could you check that?
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@idefix37
Then I wondered if the HRRR model data was wrong. But it is not, as the NOAA map below shows the correct wind directions around the same Low as that in my previous post. I have symbolized the center of the depression by a circle in the middle of converging winds. They are well entering into the Low.
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I noticed this is still doing this (wind blows from low to high in regional models and seems to be only in the western part of the domain). Any ideas come up?
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The same issue remains. Could this be a clue? Both the models with the problem are regional; All the global models are OK.
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📉 Maybe effects of oceanic bold relief?
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@Caefix
Hey young mate, your explanation is a nonsense. Your screenshots demonstrate nothing. Don’t give hypothetical and crazy explanations when you don’t know the reason of the issue… And this is not the first time. -
@idefix37 Sorry for the joke. The High near Kamtschatka shows the arrow issue quite good.
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@Caefix
So don’t add lame explanation just for fun.
