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Mexican METAR

Old 14th May 2017, 12:53
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Champagne anyone...?
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Mexican METAR

Dull question I'm afraid and apologies if in the wrong forum but I reckoned you North American types would be most likely to know the answer to this......

What does the "957" in the RMK section of this METAR refer to? I thought I knew all the weird RMK codes but this one has me stumped....

METAR MMMX 141143Z 07007KT 8SM FEW080 16/09 A3030 NOSIG RMK
SLP080 52006 957 8/030 HZY=

Thanks
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Old 14th May 2017, 18:39
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I think this might be it...

P is the 3 least-significant digits of mean sea-level
pressure in whole dekaPascals. To the left of the 3
digits, prefix either 9 or 10, depending on which
one gives a value closest to standard sea-level pres-
sure. For kPa, insert a decimal point two places
from the right. For hPa, insert a decimal point one
place from the right.
Example: 041 means 10041 daPa = 1004.1 hPa =
1004.1 mb = 100.41 kPa. New example: 957 means
9957 daPa = 995.7 hPa = 995.7 mb = 99.57 kPa.
[CAUTION: Some organizations report P in inches of mer-
cury (in. Hg.) instead of hPa. P MSL (in. Hg.) is an altimeter
setting, used by aircraft pilots.]
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Old 14th May 2017, 19:52
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Champagne anyone...?
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Thanks very much but I think that refers to the "SLP***" code in the RMKs...
In this example SLP080 means 1008.0 hPa which is close to the altimeter of 30.30ins. 957hPa is way off. I'll keep searching!
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Old 16th May 2017, 07:47
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The 9xx group refers to the 24-hour barometric pressure change in 0.1 hPa increments (similar to the preceeding 5axxx group which is the 3-hour pressure tendency).

So 957 means 5.7 hPa pressure change in the last 24 hours.
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Old 16th May 2017, 12:19
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Champagne anyone...?
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Magnificent, thanks very much!
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Old 30th May 2017, 14:52
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Sweet King Kamehameha, who reads METARs that far? I'd be done after NOSIG myself.
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Old 31st May 2017, 04:33
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At a job interview years back the Chief Pilot pushed a messy METAR across the table and asked what was going on at the station. When I got to the point where I told him how much it had rained in the last hour he pulled it back and was done.
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Old 31st May 2017, 11:40
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I just use this handy decoder.
Attached Images
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Old 31st May 2017, 21:14
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Years ago the folks from National Airlines in MIA showed me how they read that international weather.

It's called the one finger rule - if you put your finger over the weather and there's still writing below your finger, the weather's bad Airbubba!
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