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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The guidance is provided in the FAA publication 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.

They had 1 inch of snow on the ground before the storm, a net gain of 20 inches.

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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. 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.

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This statement is inaccurate and misleading in that it gives the impression faal the weather observers contractors at Fsao Thurgood Marshall Airport did not accurately perform their job in measuring snowfall. Email Required, but never shown. There used to be some correlation between airports with a control zone cz and towered airports having “manned” weather reporting.

Post as a guest Name. Service Level A covers major aviation observation. The highest category, referred to as Service Level A, includes major aviation hubs and high traffic volume airports with average or worse weather. Services at in weather observation. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Bob Showalter 21 1. Home Questions Tags Users Unanswered. 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. IAD had 20 inches of snowfall and had a snow depth of 21 inches of snow on the ground after the storm. Service Level A, the highest and most 2. Gloomy Weather 11 2. During the dates of the storm over February 5 and 6, BWI reported a snow depth of 24 inches.


Last “published” report was This is referred to as “augmentation. 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 Level C in order to enhance air traffic control term “Service Standards” refers to the level of detail efficiency and increase system capacity.

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.

There is no further guidance given in the FAA manual If you wish to see it, please email wxobservers yahoo. 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. Sign up using Email and Password.

In fact, the FAA manual The weather observers use panels of wood or plastic called snow boards on which snow accumulates to do their measurements. The relevant paragraph states: TBL contains a comparison of weather inserts the correct or missing value for the automated observing programs and the elements reported.

Sun mischaracterizes snow measurement protocol

Specific observational elements locations, FSS observers. The weather observers fao 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.

These workers know well the correct procedures to follow regarding snow measurement and followed them during the time period in question.


In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote:. For background, the FAA has determined Service Standards to categorize the levels of detail in weather observation sites.

faao 7900.5b pdf

The manned stations with control zones also provided “airport advisory service” monitoring traffic on Where can I find an airport’s level of service for weather services? This service is provided by air traffic controllers under the Limited Aviation f.

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 Faak Sterling that reported 32 inches of snowfall but only an increase of snow depth of 21 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 7900.

the snow ends.

Moreover, the FAA requires observers to keep track of the snow increasing every hour and requires hourly measurements. The relevant paragraph states:. Sign up or log in Sign up using Google. In a February 7 article “A likely record, but experts will get back to us” Frank Roylance wrote: The FAA manual According to AJT, the yearly updates have been discontinued without giving any reason that we are aware of.

It is therefore odd that the NWS would also accuse the faal 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. Aviation Stack Exchange works best with JavaScript enabled.