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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IAD had 20 inches of snowfall and had a snow depth of 21 inches of snow on the ground after the storm. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Given their geographic proximity, fqao snow they reported to have fallen at each location seem to coincide. TBL contains a comparison of weather 790.5 the correct or missing value for the automated observing programs and the elements reported.

According to AJT, the yearly updates have been discontinued without giving any reason that we are aware of.

Sun mischaracterizes snow measurement protocol

There used to be some correlation between airports with a control zone cz and towered airports having “manned” weather reporting.

Service Level A covers major aviation observation. Email Required, but never shown. Service Level A, the highest and most 2. This is referred to as “augmentation. The guidance is provided in the FAA publication 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.

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.


Where to find US airport weather Service Levels? You’d provide your position information to the weather station person, calling out “radio, N is 10 miles out Where can I find an airport’s level of service for weather services?

The Service Level C in order to enhance air traffic control fsao “Service Standards” refers to the level of detail efficiency and increase system capacity.

The FAA manual The second category, known as Service Level C, consists of all the elements of Service Level D, in addition to a human observer, who adds information to the automated observation.

In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote: Home Questions Tags Users Unanswered.

Post as a guest Name. These workers know well the correct procedures to follow regarding snow measurement and followed them during the time period in question. Services at in weather observation. Last “published” report was 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. 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.

During the dates of the storm over February 5 and 6, BWI reported a snow depth of 24 inches. This service is provided by air traffic controllers under the Limited Aviation f.

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Bob Showalter 21 1. It is therefore inaccurate to claim that in every instance the NWS policy states that snow must be measured only every six hours. Sign up using Facebook.

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. Those rules say the observer must allow snow to fall on an official ‘snow board’ for six hours, then wipe it clear and 7900. the procedure every six hours until the snow ends.


These procedures were followed at BWI. The highest category, referred to as Service Level A, includes major aviation hubs and high traffic volume airports with average or worse weather. Sign up using Email and Password. 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. By clicking “Post 790.5 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.

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. There is no further guidance given in the FAA manual 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.

The relevant paragraph states: The relevant paragraph states:. The weather observers use panels of wood or plastic called snow boards on which snow accumulates vaao do their measurements.

Our company employs the weather observers at BWI.