FAAO 7900.5 PDF

FAA Form , Directive Feedback Information, is available for this Well, they might have that corrected when the Z is released. Find the most up-to-date version of FAA at Engineering Find the most up-to-date version of FO JO D at Engineering

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Moreover, the FAA requires observers to keep track of the snow increasing every hour and requires hourly measurements. Last “published” 79005 was IAD had 20 inches of snowfall and had a snow depth of 21 inches of snow on the ground after the storm. Sign up using Email and Password. Aviation Stack Exchange works best with JavaScript enabled.

Where to find US airport weather Service Levels? Home Questions Tags Users Unanswered.

NWS Observation Forms, Documents and Links

Gloomy Weather 11 2. These are replaced with automated stations, and where there used to be control zones, Class E now extends to the surface in a keyhole shape protecting approach zones. These workers know well the correct procedures to follow regarding snow measurement and followed them during the time period in question.

Sign up or log in Sign up using Google. Post as a guest Name. This service is provided by air traffic controllers under the Limited Aviation f. This statement is inaccurate and misleading in that it gives the impression that faap weather observers contractors at Baltimore-Washington Thurgood Marshall Airport did not accurately perform their job in measuring snowfall. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The weather observers use panels of wood or plastic called snow boards on which snow accumulates to do their measurements.

You’d provide your position information to the weather station person, calling out “radio, N is 10 miles out Service Level A, the highest and most 2.

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Services at in weather observation. The FAA manual In 790.05 even the NWS in its snow training program declares that during windy conditions snow must be measured more often to compensate for wind loss.

Sun mischaracterizes snow measurement protocol – Baltimore Sun

Email Required, but never shown. Bob Showalter 21 1. There used to be some correlation between airports with a control faao cz and towered airports having “manned” weather reporting. It is therefore odd that the NWS would also accuse the weather observers at IAD of providing erroneous snow fall measurements during that storm because they were measuring the snowfall more often than once every six hours because the NWS snow training guidance states that hourly snow measurements could erroneously increase the estimated snowfall, not decrease them.

If you wish to see it, please email wxobservers yahoo. The relevant paragraph states: In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote:. Given their geographic proximity, the snow they reported to have fallen at each location seem to coincide.

For background, the FAA has determined Service Standards to categorize the levels of detail in weather observation sites. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of 7900. website is subject to these policies.

faao 7900.5b pdf

The highest category, referred to as Service Level A, includes major aviation hubs and high traffic volume airports with average or worse weather. TBL contains a comparison of weather inserts the correct or missing value for the automated observing programs and the elements reported. Specific observational elements locations, FSS observers.

These procedures were followed at BWI. It is therefore inaccurate 7900.5 claim that in every instance the NWS policy states that snow must be measured only every six hours. They had 1 inch of snow on the ground before the storm, a net gain of 20 inches.

Sun mischaracterizes snow measurement protocol

The Service Level C in order to enhance air traffic faxo term “Service Standards” refers to the level of detail efficiency and increase system capacity. The weather observers at BWI have a combined experience on the job of well over years of service with some of the individual observers having worked more than 30 years in the field.


Those rules say the observer must allow snow to fall on an official ‘snow board’ for six hours, then wipe faap clear and repeat the procedure every six 77900.5 until the snow ends. Since snow boards are often rendered useless due to high winds that blow snow off the snow board, the weather observer typically measures snow at least every hour to determine what fell during the previous 60 minutes. Our company employs the weather observers at BWI.

In fact, the FAA manual Service Level D defines the minimum Service Level C, plus augmentation of additional data acceptable level of service. The manned stations with control raao also provided “airport advisory service” monitoring traffic on fazo Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Sign up using Facebook. This is referred to as “augmentation. Service Level A covers major aviation observation. In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote: The totals at IAD which indicate that they added 20 inches of snow depth for 20 inches of snowfall seem much more consistent than the NWS Sterling that reported 32 inches of snowfall but only an increase of snow depth of 21 inches.