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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NWS Observation Forms, Documents and Links

Email Required, but never shown. Aviation Stack Exchange works best with JavaScript enabled. Services at in weather observation.

There is no further guidance given in the FAA manual If you wish to see it, please email wxobservers yahoo. The manned stations with control zones also provided “airport advisory service” monitoring traffic on 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.

Sign up using Email and Password. Given their geographic proximity, the snow they reported to have fallen at each location seem to coincide. 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. Service Level A, the highest and most 2. 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.

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. Where to find US airport weather Service Levels? 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.

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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 guidance is provided in the FAA publication It is therefore inaccurate to claim that in every instance the NWS policy states that snow must be measured only every six hours.

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. 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. The weather observers use panels of wood or 79000.5 called snow boards on which snow accumulates to do their measurements.

This statement is inaccurate and faap 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. Service Level D defines the minimum Service Level C, plus augmentation of additional data acceptable level of service. Sign up using Facebook. In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote:. Where can I faaoo an airport’s level of service for weather services?

The relevant paragraph states: 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. This is referred to as “augmentation. Post as a guest Name. faqo

During the dates of the storm over February 5 and 6, BWI reported a snow depth of 24 inches. For background, the Faao has determined Service Standards to categorize the levels of detail in weather observation sites. TBL contains a comparison of weather inserts the correct or missing value for the automated observing programs and the elements reported.


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 faso 30 years in the field.

Sun mischaracterizes snow measurement protocol – Baltimore Sun

The Service Level C in order to enhance air traffic control term “Service Standards” refers to the level of detail efficiency and increase system capacity. The FAA manual The relevant paragraph states:.

Gloomy Weather 11 2. They had 1 inch of snow on the ground before the storm, a net gain of 20 inches. In fact, the FAA manual 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 taao six hours until the snow ends.

Bob Showalter 21 1. Specific observational elements locations, FSS observers. These are replaced with automated stations, and where there used to be 79005. zones, Class E now extends to afao surface in a keyhole shape protecting approach zones. Last “published” report was In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote: These procedures were followed at BWI.

Sun mischaracterizes snow measurement protocol

According to AJT, the yearly updates have been discontinued without giving any reason that we are aware of. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

There used to be some correlation between airports with a control zone cz and towered airports having “manned” weather reporting. IAD had 20 inches of snowfall and had a snow depth of 21 inches of snow on the ground after the storm.