NOUS41 KWBC 221738



Service Change Notice 11-12

National Weather Service Headquarters Washington DC

1237 PM EST Tue Feb 22 2011


TO:       Subscribers

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS partners and employees


FROM:     Thomas Graziano

          Chief, Hydrologic Services Division


SUBJECT:  Transfer of Hydrologic Services in northern Arizona

          Effective May 10, 2011


Effective Tuesday May 10, 2011, at 900 am Mountain Daylight Time (MDT), 1500 Coordinated Universal Time (UTC), hydrologic service responsibility for river forecast locations in Mohave County, AZ, from the Utah/Arizona border south to the Colorado River, will be transferred from the Weather Forecast Office (WFO) in Salt Lake City, UT, (WFO SLC) to the WFO in Las Vegas, NV (WFO VEF). This transfer will include the river forecast point at Littlefield, AZ, on the Virgin River.


Additionally, hydrologic service responsibility for Coconino County, AZ, from the Utah/Arizona border south to the Colorado River will be transferred from WFO Salt Lake City to WFO Flagstaff, AZ (WFO FGZ). These changes will align Hydrologic Service Areas and County Warning Areas to enable more efficient service. See Table 1 for details on the river forecast points to be transferred to WFO Las Vegas from WFO Salt Lake City on May 10, 2011.


Because of this transfer, customers must take appropriate action to receive the products listed in Table 2 for Virgin River forecast points in Mohave County in Arizona using the VEF identifier.


Updated hydrologic service area shapefiles are online at:


Table 1. River forecast points transferring to WFO Las Vegas.


FORECAST                              COUNTY         COUNTY

POINT                                                IDENTIFIER


Virgin River at Littlefield           Mohave         VLTA3



Table 2. Products affected by this change for the Virgin River in Arizona. Headers referred to as new are existing headers that will be used after the transfer.


PRODUCT               WMO HEADER           AWIPS ID


Flood Statement      /NEW/ WGUS85 KVEF     /NEW/ FLSVEF

                   * /OLD/ WGUS85 KSLC *   /OLD/ FLSSLC


Flood Warning        /NEW/ WGUS45 KVEF     /NEW/ FLWVEF

                   * /OLD/ WGUS45 KSLC *   /OLD/ FLWSLC


Flood Watch          /NEW/ WGUS65 KVEF     /NEW/ FFAVEF

                   * /OLD/ WGUS65 KSLC *   /OLD/ FFASLC


Hydrologic           /NEW/ FGUS75 KVEF     /NEW/ ESFVEF

Outlook            * /OLD/ FGUS75 KSLC *   /OLD/ ESFSLC


Hydrologic           /NEW/ SRUS45 KVEF     /NEW/ RVAVEF

Summary            * /OLD/ SRUS45 KSLC *   /OLD/ RVASLC


Daily River and      /NEW/ FGUS55 KVEF     /NEW/ RVDVEF

Lake Summary       * /OLD/ FGUS55 KSLC *   /OLD/ RVDSLC


River Statement      /NEW/ FGUS85 KVEF     /NEW/ RVSVEF

                   * /OLD/ FGUS85 KSLC *   /OLD/ RVSSLC


*These old products will continue to exist, but will cover areas

 outside of the VEF county warning and forecast area.


If you have any questions, you may contact:


     Larry Dunn

     Meteorologist in Charge

     National Weather Service

     WFO Salt Lake City

     2242 West North Temple

     Salt Lake City, UT   84116



     Michael Staudenmaier

     Meteorologist in Charge

     National Weather Service

     WFO Las Vegas

     7851 Dean Martin Drive

     Las Vegas , NV    89139



     Brian Klimowski

     Meteorologist in Charge

     National Weather Service

     WFO Flagstaff

     49 Hughes Avenue

     Camp Navajo , AZ    86015



National Service Change Notices are online at: