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7900.5D
Sept 22, 2015 20:04:40 GMT -5
Post by snowspinner on Sept 22, 2015 20:04:40 GMT -5
I just got an e-mail to review the draft of the 7900.5D...the FAA is looking for some feedback. I hope to start looking it over tomorrow...
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7900.5D
Sept 23, 2015 13:28:42 GMT -5
Post by tornado on Sept 23, 2015 13:28:42 GMT -5
That's going to be a problem, if an exception is not made to disable it if unrepresentative.
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7900.5D
Sept 23, 2015 14:38:39 GMT -5
via mobile
Post by fu on Sept 23, 2015 14:38:39 GMT -5
That part about ALDARS being enabled 24/7 should only apply for AUTO sites and needs to be corrected.
This is clarified further in the draft where it says that VCTS can only be reported at AUTO sites.
CWOs are considered an Augmented Station by the definition in the 7900.5D and will not report VCTS based on the 7900.5D.
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7900.5D
Sept 23, 2015 15:29:35 GMT -5
Post by tornado on Sept 23, 2015 15:29:35 GMT -5
Isn't Minneapolis-St. Paul a CWO site?
SPECI KMSP 231907Z 22008KT 9SM VCTS OVC039CB 24/18 A3016
RMK AO2 LTG DSNT E-SW OCNL LTGICCG VC E-SE VCTS
E-SE MOV NE PRESENT WX VCSH T02390183
Seems that site is going by the "ALDARS must be enabled" maxim.
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7900.5D
Sept 23, 2015 15:56:06 GMT -5
via mobile
Post by fu on Sept 23, 2015 15:56:06 GMT -5
The enable 24/7 order was issued by the same people that now want to transition to LAWRS.
My understanding is that those people will be out of the decision making business soon.
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7900.5D
Sept 23, 2015 16:35:53 GMT -5
Post by coldairfunnel on Sept 23, 2015 16:35:53 GMT -5
"That's going to be a problem, if an exception is not made to disable it if unrepresentative."
It's all in the wording.....if they want to make it mandatory then they need to say "shall". In my opinion "Must" sounds like a plea for help...lol
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Post by alstein on Sept 23, 2015 22:22:59 GMT -5
At this point, I'd say it's so bad that we probably must defy the FAA on this one point. I think we can interpret it as critical to safety.
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7900.5D
Sept 24, 2015 5:38:34 GMT -5
via mobile
Post by fu on Sept 24, 2015 5:38:34 GMT -5
10.29 of the draft 7900.5D
A thunderstorm is considered to to begin at the station when....or lightning is detected by an automated sensor within 10 miles of the airport.
ALDARS does not begin TS until ltg is detected within 5 miles. From 5-10 miles ALDARS reports VCTS which is not considered a TS for climatological record keeping. The reason HQs is pushing for ALDARS to be activated 24/7 is to greatly reduce the number of TS reported by CWO'S in the event the new standards are overturned and TS occurrence is returned to the Bad Weather Score computation.
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7900.5D
Sept 24, 2015 5:56:58 GMT -5
Post by TCU 2U2 on Sept 24, 2015 5:56:58 GMT -5
10.29 of the draft 7900.5D A thunderstorm is considered to to begin at the station when....or lightning is detected by an automated sensor within 10 miles of the airport. ALDARS does not begin TS until ltg is detected within 5 miles. From 5-10 miles ALDARS reports VCTS which is not considered a TS for climatological record keeping. The reason HQs is pushing for ALDARS to be activated 24/7 is to greatly reduce the number of TS reported by CWO'S in the event the new standards are overturned and TS occurrence is returned to the Bad Weather Score computation. However weather statistics (30 years worth) are updated every 10 years, with the next scheduled update around 2021, which would incorporate weather from 1991-2020. This of course would require the service standards using (and following) the same rules as in the past. |
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7900.5D
Sept 24, 2015 6:05:31 GMT -5
via mobile
Post by fu on Sept 24, 2015 6:05:31 GMT -5
The new standards might not be overturned for several years.
The FAA is attempting to redefine what a thunderstorm is, it's as simple as that.
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7900.5D
Sept 24, 2015 10:41:31 GMT -5
via mobile
Post by fu on Sept 24, 2015 10:41:31 GMT -5
That's going to be a problem, if an exception is not made to disable it if unrepresentative. Table 6-6. Footnote 4.(page 6-7 of the draft) TS reporting is produced via backup if ALDARS should become inoperative or is unrepresentative. |
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7900.5D
Sept 24, 2015 11:07:15 GMT -5
Post by TCU 2U2 on Sept 24, 2015 11:07:15 GMT -5
That's going to be a problem, if an exception is not made to disable it if unrepresentative. Table 6-6. Footnote 4.(page 6-7 of the draft) TS reporting is produced via backup if ALDARS should become inoperative or is unrepresentative. (394.9 KB) So that passage in the draft (7900.5D) will take the place of the attached memo from ATO back in 2013. |
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7900.5D
Sept 24, 2015 12:27:32 GMT -5
via mobile
Post by fu on Sept 24, 2015 12:27:32 GMT -5
Table 6-6. Footnote 4.(page 6-7 of the draft) TS reporting is produced via backup if ALDARS should become inoperative or is unrepresentative. So that passage in the draft (7900.5D) will take the place of the attached memo from ATO back in 2013. It's written like that in 7900.5C. Nothings changed. |
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7900.5D
Sept 24, 2015 16:02:32 GMT -5
Post by toofarnorth on Sept 24, 2015 16:02:32 GMT -5
I get the impression from this that they want us to bone up on .5c as well...
I'm happy they are asking, but would be much happier still if they provided us with an accurate summary of changes between .5c & .5d - line by line comparison is going to take some time - we will get it done.
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7900.5D
Sept 24, 2015 19:00:59 GMT -5
Post by hlsto2 on Sept 24, 2015 19:00:59 GMT -5
I get the impression from this that they want us to bone up on .5c as well... I'm happy they are asking, but would be much happier still if they provided us with an accurate summary of changes between .5c & .5d - line by line comparison is going to take some time - we will get it done. the gave a list of the changes in appendix J. they still missed most of the errors I caught in 7900.5C for instance...read the second sentence of page 109 para 14.21.b..... |
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