[nws-changes] 20101020: Volcanic ash format Fwd: ADMIN NOTICE NOUS41 KWBC

• To: nws-changes@xxxxxxxxxxxxxxxx
• Subject: [nws-changes] 20101020: Volcanic ash format Fwd: ADMIN NOTICE NOUS41 KWBC
• From: Linda Miller <lmiller@xxxxxxxxxxxxxxxx>
• Date: Wed, 20 Oct 2010 07:09:38 -0600

-------- Original Message --------

597
NOUS41 KWBC 201303
PNSWSH

Service Change Notice 10-52
National Weather Service Headquarters Washington DC
903 AM Wed EDT Oct 20 2010

To:      Subscribers:
         -Family of Services
         -NOAA Weather Wire Service
         -Emergency Managers Weather Information Network
         -NOAAPORT
         Other NWS partners and employees

From:    Cynthia Abelman
         Chief, Aviation Services Branch

Subject: Format change for the volcanic ash
         SIGMET effective November 18, 2010.

In response to the latest edition of Annex 3, ICAO document
that governs Aviation Weather standards and recommended
practices, the following change will be made to the
volcanic ash SIGMET. On the second line, the location of
the Volcano (labeled LOC) will be changed to position
(labeled PSN). The change will take place Thursday,
November 18, 2010, at 0000 Coordinated Universal Time UTC).

See the example below:

CURRENT VA SIGMET FORMAT
WVNT06 KKCI 082030
TJZS SIGMET FOXTROT 2 VALID 082030/090230 KKCI-
SAN JUAN FIR VA FROM SOUFRIERE HILLS LOC 1642N06210W
VA CLD OBS AT 2030Z SFC/060 WI N1730 W06400 - N1700 W06300
- N1650 W06300 - N1710 W06400 - N1730 W06400. MOV W 15KT.
FCST 0230Z VA CLD APRX N1730 W06500 - N1700 W06300 - N1650
W06300 - N1710 W06500 - N1730 W06500.

NEW VA SIGMET FORMAT

WVNT06 KKCI 082030
TJZS SIGMET FOXTROT 2 VALID 082030/090230 KKCI-
SAN JUAN FIR VA FROM SOUFRIERE HILLS PSN 1642N06210W
VA CLD OBS AT 2030Z SFC/060 WI N1730 W06400 - N1700 W06300
- N1650 W06300 - N1710 W06400 - N1730 W06400. MOV W 15KT.
FCST 0230Z VA CLD APRX N1730 W06500 - N1700 W06300 - N1650
W06300 - N1710 W06500 - N1730 W06500.

The following WMO headers used by the United States
Meteorological Watch Offices are affected.

WMO HEADERs
WVNT[01-13] KKCI
WVPN[01-13] KKCI
FVAK[21-25] PAWU
WVPA[01-13] PHFO

If you have any questions:

  Michael Graf
  National Weather Service
  SSMC-2 Station 13314
  1325 East-West Highway
  Silver Spring Md. 20910
  301-713-1726 X 117
  Michael.graf@xxxxxxxx

This and other NWS Technical Implementation Notices are
available at:

  http://www.nws.noaa.gov/om/notif.htm

$$
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