Section 7. Flight Advisories (SIGMET/WS-AIRMET/WA-Convective SIGMET/WST)
9-7-1. GENERAL
Flight advisories are issued by the AWC in Kansas
City, Missouri, the AAWU in Anchorage, Alaska,
and the WFO in Honolulu, Hawaii, for the occurrence
or expected occurrence of specified en route weather
phenomena which may affect the safety of aircraft
operations. The report type designator WS for
SIGMETs, WST for Convective SIGMETs, and WA
for AIRMETs is used to effect selective distribution
For the contiguous U.S., WSTs are issued hourly at
55 minutes past every hour. WAs are issued as
described in TBL 971.
9-7-2. DISTRIBUTION
WSs are distributed at unscheduled times to all
Service A circuits. WAs and WSTs bulletins are
distributed as scheduled products. Updates or
amendments issued will completely replace the
previously issued advisory.
TBL 9-7-1
AIRMET Issuance Schedule
|
|
1st Scheduled Issuance
(UTC)
|
2nd Scheduled Issuance
(UTC)
|
3rd Scheduled Issuance
(UTC)
|
4th Scheduled Issuance
(UTC)
|
|
CONUS
|
O255
|
0855
|
1455
|
2055
|
|
Alaska
|
0215 (DT)/
0315 (ST)
|
0815 (DT)/
0915 (ST)
|
1415 (DT)/
1515 (ST)
|
2015 (DT)/
2115 (ST)
|
|
Hawaii
|
0400
|
1000
|
1600
|
2200
|
|
|
|
|
|
|
|
Note:
DT – Daylight Time, ST – Standard Time
|
|
