U.S. DEPARTMENT OF TRANSPORTATION
FEDERAL AVIATION ADMINISTRATION

ORDER
JO 7110.10X
Effective Date:
April 3, 2014
 
     
Subject:  Flight Services
 

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 9񫞅.

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

 

 

 
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