NOUS41 KWBC 071739 AAA



Service Change Notice 15-10:  Amended

National Weather Service Headquarters Washington DC

140 PM EDT Thu May 7 2015


To:       Subscribers:

          -Family of Services

          -NOAA Weather Wire Service

          -Emergency Managers Weather Information Network


          Other NWS partners and employees


From:     Eli Jacks

          Acting Chief, Forecast Services Division


Subject:  Amended:  Changes to the Marine Weather Message (MWW)

          Effective May 7, 2015 


Refer to: SCN 14-66 and SCN 14-67 both issued May 7, 2015:  

          Changes to the Hurricane Local Statement effective

          May 7, 2015 


Amended effective date from June 1 to May 7, 2015 due to a high

chance of a subtropical or tropical cyclone developing near the

southeast United States coast.


Effective Thursday, May 7, 2015, the NWS will implement changes

to the Hurricane Local Statement (HLS) and the Marine Weather

Message (MWW). See SCN 14-66 and SCN 14-67 for more information.


As part of these changes, the HLS will become a land zone only

product. The HLS will no longer be the mechanism for issuing

tropical storm, hurricane and typhoon watches and warnings for

marine zones in a WFO's area of responsibility.


Effective May 7, 2015, WFOs will issue tropical storm,

hurricane, and typhoon watches and warnings via the Marine

Weather Message (MWW) for marine zones in the Atlantic,

Caribbean, Gulf of Mexico and Pacific waters. In addition to the

current marine Valid Time Event Code (VTEC) codes, the MWW will

also carry the tropical VTEC codes:


TR.A - Tropical Storm Watch

TR.W - Tropical Storm Warning

HU.A - Hurricane Watch

HU.W - Hurricane Warning

TY.A - Typhoon Watch

TY.W - Typhoon Warning


Additional information on UGC and VTEC can be found in NWS

Instruction (NWSI) 10-1703, Valid Time Event Code, at:


A complete list of WFOs affected by the changes above can be

found at:


There will be no change to WMO headers or AWIPS IDs for the HLS

or the MWW. Users will need to look to the MWW for tropical

hazards over marine zones.


An example of the MWW with tropical VTEC codes, headlines, and

content can be found at


For questions regarding this notice, please contact:

Richard May

NWS Marine and Coastal Weather Services Branch

Silver Spring, MD 20910

Telephone: 301-427-9378



National Service Change Notices are online at: