ADVOKS GLOBAL · KENYA
The Civil Aviation (Meteorological Service for Air Navigation) Regulations, 2025
43. SIGMET information.
Edition: 2026-03-03 · In force
43. SIGMET information.
(1)The meteorological service provider shall issue SIGMET information, aerodrome warnings and wind shear warnings and alerts in accordance with the technical specification and detailed criteria specified in the Manual of Implementing Standards-Meteorological Service for Air Navigation.(2)SIGMET information shall be—(a)issued by a meteorological watch office and give a concise description concerning the occurrence or expected occurrence of specified en-route weather phenomena, which may affect the safety of aircraft operations, and of the development of those phenomena in time and space;(b)One of the following phenomena shall be included in SIGMET information—(c)cancelled when the phenomena referred to in subregulation (2)(a) above are no longer occurring or are no longer expected to occur in the area.(3)The period of validity of a SIGMET message shall be not more than 4 hours and in the special case of SIGMET messages for volcanic ash cloud or tropical cyclones, the period of validity shall be extended up to six hours.(4)SIGMET information concerning volcanic ash cloud or tropical cyclones shall be based on advisory information provided by Volcanic Ash Advisory Centres (VAACs) and Tropical Cyclone Advisory Centres (TCACs), respectively, designated by regional air navigation agreement.(5)Close coordination shall be maintained between the meteorological watch office and the associated area control centre or flight information centre to ensure that information on volcanic ash included in SIGMET and NOTAM is consistent.(6)SIGMET messages shall be issued not more than 4 hours before the commencement of the period of validity and in the special case for volcanic ash cloud and tropical cyclones, these messages shall be issued as soon as practicable but not more than twelve hours before the commencement of the period of validity:Provided that SIGMET messages for volcanic ash or tropical cyclones shall be updated at least every six hours.(7)In cases where the airspace is divided into an FIR and an upper flight information region (UIR), the SIGMET shall be identified by the location indicator of the air traffic services unit serving the FIR.