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Post by tornado on Feb 13, 2014 16:28:10 GMT -5
On page 84 of the 7900.5C, it reads: Now for an example: SCT020 BKN040 RMK CIG LWR N Does the remark mean that the 4,000 foot deck is somewhat lower to the north; or can the remark mean that the 2,000 foot deck is forming a ceiling to the north?
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Post by toofarnorth on Feb 13, 2014 17:55:46 GMT -5
2,000 is how we would reads your CIG LWR N
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coco
Full Member
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Post by coco on Feb 14, 2014 9:44:35 GMT -5
What's wrong with a simple "LWR CLDS N"...??
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Post by toofarnorth on Feb 14, 2014 11:21:48 GMT -5
While providing some info, what is the "operational significance"? LWR CLDS doesn't tell a pilot if there are enough holes in your layer to fly through VFR or not. CIG LWR tells a pilot that there is a cloud deck that is likely to require flying in the clouds before seeing the ground underneath - this is particularly important if the CIG N is on your approach slope. LWR CLDS is not "wrong", just not enough info and possibly confusing. I would not use "LWR CLDS N".
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Post by skobie on Feb 14, 2014 13:01:21 GMT -5
Since you don't have a ceiling until a layer is BKN, I would take CIG LWR N in the example you gave (SCT020 BKN040) to mean there is a ceiling lower than 4000 feet to the north.
skobie
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Post by snowwx on Feb 14, 2014 13:30:11 GMT -5
But my ultimate question on this scenario is ...how do you know the cig is lower north...you don't have a ceiling light there...basically you are just guessing...maybe a pirep would help...but if we had said CIGS LWR N we would be dinged for an error, given we don't know how much lower it is...
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Post by swifterz on Feb 14, 2014 14:06:43 GMT -5
But my ultimate question on this scenario is ...how do you know the cig is lower north...you don't have a ceiling light there...basically you are just guessing...maybe a pirep would help...but if we had said CIGS LWR N we would be dinged for an error, given we don't know how much lower it is... It just depends on your location. Here in Juneau we are surround by mountains that we have the heights to of all of them as well as the ridges. Its a pretty common remark for us here.
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Post by tornado on Feb 14, 2014 16:23:58 GMT -5
but if we had said CIGS LWR N we would be dinged for an error, given we don't know how much lower it is... Why would you be dinged? It's in the 7900.
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Post by hlsto2 on Feb 14, 2014 22:04:00 GMT -5
you could trap yourself with an error if your sky was BKN020 and you put in a remark LWR CLDS N. a lower deck of clouds would require that layer be in the sky field. say you estimated the clds were based at 500 ft. FEW005 BKN020 possibly a remark FEW005 N
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Deleted
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Post by Deleted on Feb 15, 2014 0:13:06 GMT -5
I may use that remark when I have a nimbostratus ceiling. That cloud tends to snake up and down as one continious layer and sometimes the lowest part, although attached completely to the entire base can be a good bit lower than the ceiling of the general layer.
JMHO
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Post by weatheri on Feb 15, 2014 14:25:23 GMT -5
Discontinuity sensor.
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