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flightopsab
1st Jun 2006, 03:56
Folks,

Got stumped by something on a METAR today

SYCJ 311700Z 09012KT 9000 VCSH BKN016 FEW018CB SCT038 BKN080 31/24 Q1013 CB + JP S-W

What is "JP"?

Thanks in advance

VH-ABC
1st Jun 2006, 04:37
Justice of the Peace to the south west?

Looked it up, and couldnt find anything either, maybe a typo?

Dookie on Drums
1st Jun 2006, 13:52
My money is on a typo as well. Never seen JP before and after a search I can't find a decode for it either on a METAR.

westernglory
1st Jun 2006, 14:05
In the 'old' days in the UK, jp was an internal met code (beaufort letters), for adjacent precipitation.

Ties in with VCSH in the body of the Metar.

FougaMagister
2nd Jun 2006, 16:58
... a bit like the TN/TX that only LFPG seem to record (and publish) then?

Somebody in the met station being a bit pedantic and telling us things we don't need to know!

Cheers :cool:

dontpickit
2nd Jun 2006, 20:07
Misprint for 'UP', which is 'unknown precipitation'?

U and J are adjacent on the keyboard!

vapourer
3rd Jun 2006, 17:11
westernglory has it on the button. It's Beaufort letters; "j" refers to a phenomenon which is within sight but not at the location of the observer and "p" means a shower ( "p" for passing). In the METAR quoted in the original question the bearing of the shower from the aerodrome is also given ie jp s-w

planeenglish
3rd Jun 2006, 20:10
** The letter ' j ' is used in combination with various other letters to record phenomena occurring within sight of, but not at the station; thus jp indicates a shower within site but not at the observing point;

for example:


jp .... precipitation within sight (often used with showers); however note that if the 'distant' shower was at the point of observation earlier, and has moved away, jp is not used in this context.

jf .... fog within sight (visibility at the station 1000 m or more )

jks .... drifting snow within sight.

MrBernoulli
4th Jun 2006, 05:42
Reminds me of the gobbledygook you often find in North American TAFs. Rarely able to find find ONE good source that provides a decode for all the strange stuff that sometimes crops up.

Well done to those folk who know about this Beaufort stuff. I've been flying for 28 years and hadn't heard of this one. Crikey, just proves that you never stop learning in this game!