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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