Chapter 26
Advisories
FNXX01 YMMC 020100 SWX ADVISORY DTG: 20190202/0100Z SWXC: ACFJ ADVISORY NR: 2019/10 SWX EFFECT: HF COM MOD OBS SWX: 02/0100Z DAYLIGHT SIDE FCST SWX + 6 HR: 02/0700Z DAYLIGHT SIDE FCST SWX + 12 HR: 02/1300Z DAYLIGHT SIDE FCST SWX + 18 HR: 02/1900Z NO SWX EXP FCST SWX + 24 HR: 03/0100Z NO SWX EXP RMK: LOW END OF BAND HF COM DEGRADED ON SUNLIT ROUTES. NEXT 12 HOURS MOST POSSIBLE, DECLINING THEREAFTER. NXT ADVISORY: 20190202/0700Z=
26.8 Low-Level Wind Shear (LLWS)/Microburst Advisories
When LLWS/microburst is reported by pilots or the integrated terminal weather system (ITWS), or detected on wind shear detection systems, such as the LLWS Alert System, the weather systems processor (WSP), or the TDWR, ATC issues the alert to all arriving and departing aircraft. ATC will continue providing the alert to aircraft until it is broadcast on the ATIS and pilots indicate they have received the appropriate ATIS code. A statement is included on the ATIS for 20 minutes following the last report or indication of the wind shear/microburst.
At facilities without the ATIS, ATC broadcasts wind shear/microburst information to all arriving and departing aircraft for 20 minutes following the last report or indication of the wind shear/microburst.
26.9 Airport Weather Warning (AWW)
The AWW addresses weather phenomena that can adversely impact airport ground operations. Information contained in this product may be useful to airport managers, fixed-based operators, airline ground personnel, and others responsible for the safety of ground operations. Ground decisions supported by the AWW information may include fueling delays during thunderstorms, deicing frequency, and other similar ground operations. AWWs are not intended for use by in-flight operations.
26.9.1 AWW Issuance
The AWW is issued for select larger airports and is available on NWS WFOs’ websites who have responsibility for issuing the TAFs for that airport. The AWW is not available on the AWC’s website.
Issuance criteria are established according to local airport requirements. Some examples of criteria are strong surface winds, freezing rain, heavy snow, and lightning within five miles of the airport.
26.9.2 AWW Format and Example
The AWW is written in a plain language, free-text format.
WWUS82 KJAX 112212 AWWJAX FLZ025-112315- AIRPORT WEATHER WARNING FOR JACKSONVILLE INTERNATIONAL AIRPORT NATIONAL WEATHER SERVICE JACKSONVILLE FL 612 PM EDT WED MAR 11 2015 ...AN AIRPORT WEATHER WARNING HAS BEEN ISSUED FOR JACKSONVILLE INTERNATIONAL AIRPORT FOR STRONG WINDS AND POSSIBLE WINDSHIFT VALID UNTIL 700 PM... A CLUSTER OF THUNDERSTORMS WILL MOVE EASTWARD AT 12 KNOTS AND AFFECT JACKSONVILLE INTERNATIONAL AIRPORT BY 620 PM. WIND GUSTS OVER 35 KNOTS ARE LIKELY WITH THESE STORMS...AS WELL AS CLOUD- TO-GROUND LIGHTNING AND REDUCED VISIBILITIES FROM HEAVY RAIN. WINDSHIFTS ACCOMPANYING THE THUNDERSTORMS MAY ALTER THE RUNWAY LANDING PATTERN WITH SOME STRONG WESTERLY WIND GUSTS. $$