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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Given their geographic proximity, the snow they reported to have fallen at each location seem to coincide. In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote:.

You’d provide your position information to the weather station person, calling out “radio, N is 10 miles out According to AJT, the yearly updates have been discontinued without giving any reason that we are aware of. In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote: The weather observers at BWI have a combined experience on the job of well over years of service with some of the 79000.5 observers having worked more than 30 years in the field.

Last “published” report was It is therefore inaccurate to claim that in every instance the NWS policy states that snow must be measured only every six hours. These workers know well the correct procedures to follow regarding snow measurement and followed them during the time period in question. Our company employs the weather observers at BWI. Since snow afao 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.

During the dates of the storm over February 5 and 6, BWI reported a snow depth of 24 inches. The service standards consist these airports are typically provided by contract of four different levels of service A, B, C, and D as weather observers, NWS observers, and, at some described below. The Service Level C in order to enhance air traffic control term “Service Standards” refers to the level of detail efficiency and increase system fxao.


Sign up or log in Sign up using Google. Service Level C is a service in which the demanding category, includes all the data reported in human observer, usually an air traffic controller, Service Standard B, plus additional requirements as augments or adds information to the automated specified.

The FAA manual Moreover, the FAA requires observers to keep track of the snow increasing every hour and requires hourly measurements.

This is referred to as “augmentation. This daao is provided by air traffic controllers under the Limited Aviation f. If you wish to see it, please email wxobservers yahoo. Services at in weather observation. In fact, the FAA manual 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.

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.

Sun mischaracterizes snow measurement protocol – Baltimore Sun

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. TBL contains a comparison of weather inserts the correct or missing value for the automated raao programs and the elements reported. Service Level A, the highest and most 2.

The guidance is provided in the FAA publication There used to be some correlation between airports with a control zone cz and towered airports having “manned” weather reporting. Aviation Stack Exchange works best with JavaScript enabled.

The manned stations with control zones also provided “airport advisory service” monitoring traffic on Gloomy Weather 11 2.

Where can I find an airport’s level of service for weather services? IAD had 20 inches of snowfall and had a snow depth of 21 inches of snow on the ground after the storm. In fact even the NWS in its snow training program declares that during windy conditions snow must be measured more often to compensate for wind loss. Post as a guest Name. Bob Showalter 21 1.


Service Level A covers major aviation observation. Sign up using Facebook. They had 1 inch of snow on the ground before the storm, a net gain of 20 inches. Those rules say the observer must allow snow to fall on an official ‘snow board’ for six hours, then wipe it clear and repeat the procedure every six hours until the snow ends. For background, the FAA has determined Service Standards to categorize the levels of detail in weather observation sites.

Sun mischaracterizes snow measurement protocol

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Therefore, one can measure as many times as needed during a six-hour period, provided the totals for all snowfall during the period are given. The highest category, referred to as Service Level A, includes major aviation hubs and high traffic volume airports with average or worse weather.

Where to find US airport weather Service Levels? Sign up using Email and Password. The relevant paragraph states:. 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.

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The weather observers use panels of wood or plastic called snow boards on which snow accumulates to do their measurements. The relevant paragraph states: This statement is inaccurate and misleading in that it gives the impression that the weather observers contractors at Baltimore-Washington Thurgood Marshall Airport did not accurately perform their job in measuring snowfall.