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FA, to provide a current and complete area forecast.
Inflight advisories (including WSTs) amend the FA;
however, when necessary, the appropriate section of
the FA will be replaced by the issuing NWS office.
The two FA sections and their communications
headers are as follows (iii denotes the FA location
identifier; e.g., ANC, CHI, etc.):
1. iiiS-Synopsis.
2. iiiI-Icing and Freezing Level.
3. iiiT-Turbulence.
4. iiiC-Significant Clouds and Weather.
9-6-2. AVIATION AREA FORECAST (FA)
SCHEDULE
a. FAs are prepared three times a day in the
contiguous 48 States and Alaska, and four times a day
in Hawaii. All scheduled transmission times are in
UTC and listed by daylight/standard times. The times
in the contiguous U.S. are in TBL 9-6-1.
TBL 9-6-1
Area Forecast Schedule
Time Zones Areas Issuance Times
Central CHI/DFW 0130/0230
0930/1030
1830/1930
Eastern BOS/MIA 0030/0130
0830/0930
1730/1830
Mountain SLC 0230/0330
1030/1130
1930/2030
Pacific SFO 0230/0330
1030/1130
1930/2030
b. The Alaska and Pacific NWS Regional
Headquarters have authority to schedule FAs to meet
user requirements. These are issued at the following
times. (See TBL 9-6-2.)
TBL 9-6-2
Alaska/Pacific Area Forecast Schedule
Issuance ANC and FAI JNU HNL
1st 0640Z 0640Z 0340Z
2nd 1440Z 1340Z 0940Z
3rd 2240Z 2240Z 1540Z
4th 2140Z
c. The Gulf FA is prepared twice daily. The
issuance times in UTC or Z depend on whether
LDT/LST is in effect and are as follows:
1. 1st issuance 1040/1140.
2. 2nd issuance 1740/1840.
9-6-3. DISTRIBUTION
Distribution of FAs is made by WMSC in accordance
with a predetermined list for each circuit based upon
intracircuit coordinated requirements.

2/14/08 JO 7110.10T
Severe Weather Forecasts 9-7-1
Section 7. Severe Weather Forecasts
9-7-1. GENERAL
Severe Weather Forecasts, Bulletins, Status Reports,
and Alerts are filed at irregular intervals by the NWS
Storm Prediction Center (SPC) in Norman,
Oklahoma, and transmitted to WMSC for distribution.
The alert (SPC AWW) is a preliminary
announcement of a forthcoming severe weather
watch and includes all information required for
aviation purposes. Stations may obtain the Severe
Weather Watch (SPC WW) from WMSC if desired.
The WW number is included in the text of the AWW.
9-7-2. DISTRIBUTION
Upon receipt of SPC AWW alert, the WMSC will
immediately interrupt the active task on selected
Service A circuits and transmit the report. Severe
weather status reports (WW-A) are never urgent.
These are relayed unscheduled.
9-7-3. SEVERE WEATHER OUTLOOK
NARRATIVE (AC)
In addition to Severe Weather Forecast, the Storm
Prediction Center will frequently file for transmission
a Severe Weather Outlook Narrative, which will
contain a brief evaluation of present and expected
surface and upper air criteria conducive to severe
local storms. These are assigned report type “AC.”

2/14/08 JO 7110.10T
Flight Advisories (SIGMET/WS-AIRMET/WA-Convective SIGMET/WST) 9-8-1
Section 8. Flight Advisories
(SIGMET/WS-AIRMET/WA-Convective SIGMET/WST)
9-8-1. GENERAL
Flight Advisories are issued by the NAWAU in
Kansas City, Missouri, for the conterminous U.S. and
the appropriate WSFO in Alaska and Hawaii to
provide notice of potentially hazardous weather
conditions by amending or supplementing portions
of the valid FA. The report type designator WS for
SIGMETs, WST for Convective SIGMETs, and WA
for AIRMETs is used to effect selective distribution.
The text of the message identifies which advisory is
being transmitted. WSs are identified with letters N
(NOVEMBER) through Y (YANKEE) with the
exception of S (SIERRA) and T (TANGO). WAs are
identified with the letters S (SIERRA), T (TANGO)
and Z (ZULU). The latest message for each system is
kept in the computer's active storage file by the
WMSC: WA for 360 minutes, WS for 240 minutes,
and WST for 45 minutes.
NOTEHonolulu
issues international SIGMETs available as
WSPA1 PHNL and WSPA2 PHNL, which are retained by
WMSC for 360 minutes.
9-8-2. DISTRIBUTION
SIGMETs, both WST/WS, are distributed unscheduled
to all Service A circuits. AIRMET data is
distributed as a scheduled product at 0145Z and every
6 hours thereafter, and any updates or amendments
issued between scheduled periods will be a complete
replacement for the previously issued AIRMET.

2/14/08 JO 7110.10T
Transcribed Weather Broadcast (TWEB) 9-9-1
　
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