135.213 Weather reports and forecasts.
(a) Whenever a person operating an aircraft under this part is required
to use a weather report or forecast, that person shall use that of the U.S.
National Weather Service, a source approved by the U.S. National Weather
Service, or a source approved by the Administrator. However, for operations
under VFR, the pilot in command may, if such a report is not available, use
weather information based on that pilot's own observations or on those of
other persons competent to supply appropriate observations.
(b) For the purposes of paragraph (a) of this section, weather
observations made and furnished to pilots to conduct IFR operations at an
airport must be taken at the airport where those IFR operations are
conducted, unless the Administrator issues operations specifications
allowing the use of weather observations taken at a location not at the
airport where the IFR operations are conducted. The Administrator issues
such operations specifications when, after investigation by the U.S.
National Weather Service and the certificate-holding district office, it is
found that the standards of safety for that operation would allow the
deviation from this paragraph for a particular operation for which an air
carrier operating certificate or operating certificate has been issued.