Service Change Notice 11-38

National Weather Service Headquarters Washington DC

230 PM EST Tues Nov 22 2011


TO:          Subscribers:

             -Family of Services

             -NOAA Weather Wire Service

             -Emergency Manager Weather Information Network


             Other NWS partners and NWS employees


FROM:        Therese Z. Pierce

             Chief, Marine and Coastal Services Branch


SUBJECT:     Changes to the format of the Marine Forecast                                 

Matrices Issued by Weather Forecast Office    Honolulu: Effective March 1, 2012  


Effective Thursday, March 1, 2012, at 400 AM Hawaiian Standard Time (HST), 1400 Coordinated Universal Time (UTC), the National Weather Service (NWS) Weather Forecast Office (WFO) in Honolulu, Hawaii will change the format of the text product, Marine Forecast Matrices (MFM).  The change will; 1) remove references to Swell1, Swell2, Swell3 etc., Period1, Period2, Period3 etc., and have all swells and periods designated simply as "Swell" and “Period,” and 2) add line breaks between each swell and period.


This change is being made to improve the clarity, readability and utility of the text product.




for examples of the current format and proposed new format of the affected portions of the product.


Table 1 lists the product issued by WFO Honolulu that will 

be affected by the change to the MFM format.


Table 1: WFO Honolulu product affected by the text format changes effective March 1, 2012.




Marine Forecast Matrices     FXHW40 PHFO      MFMHFO


Customers do not need to take any actions in order to continue receiving this product.


If you have any questions or comments, please contact
   Raymond Tanabe
   Meteorologist in Charge
   National Weather Service Honolulu
   2525 Correa Road
   Suite 250 
   Honolulu, Hawaii 96822
   808 973 5282
National Service Change Notices are online at: