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NOUS41 KWBC 271859

Service Change Notice 14-56
National Weather Service Headquarters Washington DC
300 PM EDT Mon Oct 28 2014

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

From:    Michael J. Szkil
         Chief, NWS Awareness Branch

Subject: Primary Valid Time Event Code becomes operational
         for several products at NWS Weather Forecast Office Guam
         effective January 13, 2015

On Tuesday January 13, 2015, at 11:00 AM Chamorro Standard Time
(ChST), 0100 Coordinated Universal Time (UTC), the NWS Weather
Forecast Office (WFO) at Tiyan, Guam (GUM) will implement the
operational Primary Valid Time Event Code (P-VTEC) for several
weather products.

P-VTEC is used in conjunction with, and provides supplemental
information to, the Universal Geographic Code (UGC) to further
aid in the automated delivery of NWS text products to users.
VTEC provides information on the event; the UGC describes the
affected geographic area.

The implementation of the operational P-VTEC coding means current
use of the letter X, denoting experimental P-VTEC, will change to
the letter O, denoting operational P-VTEC, in WFO GUM products.

For example, current experimental P-VTEC in a Coastal Hazard


Will become:


The following WFO text product categories will transition to
operational P-VTEC:

  Product                 AWIPS Identifier    WMO Header
  -------                 ---------------     ----------

  Coastal Hazard Message  CFWMY               WHMY40 PGUM
  Flood Watch             FFAMY               WGMY60 PGUM
  Non-Precipitation       NPWMY               WWMY70 PGUM
    Weather Message
  Fire Weather Message    RFWMY               WWMY80 PGUM

These are the final WFO GUM products using experimental P-VTEC
that will transition to operational P-VTEC.

Users who parse NWS text watches and warnings must make changes
to their communications systems by January 13, 2015, to correctly
process each of the above products. If January 13, 2015 is
declared a Critical Weather Day or significant weather is
occurring at, or forecast for WFO GUM, implementation of this
change will occur on the next weekday not declared a Critical
Weather Day and when no significant weather is occurring at, or
forecast for WFO GUM.

More detailed information on VTEC can be found in NWSI 10-1703,
Valid Time Event Code, online at:

For more information, please contact:

  Charles Guard
  WFO Guam
  Warning Coordination Meteorologist
  E-mail:  671-472-0946

  Timothy Schott
  NWS Headquarters
  Dissemination Services Manager
  Phone:  301-713-0090 x146

National Service Change Notices are online at:

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