Public Information Statement
Issued by NWS National HQ
NOUS41 KWBC 271457 AAB
Public Information Statement, Amended
National Weather Service Headquarters Washington DC
1057 AM EDT Tue Sep 27 2016
-NOAA Weather Wire Service
-Emergency Managers Weather Information Network
Other NWS Partners and Employees
FROM: Tim Oram
Acting Chief, Marine, Tropical, and Tsunami Services
SUBJECT: Amended: Soliciting comments on the Experimental
Enhanced Coastal Waters Forecast Using Rayleigh
Distribution for Wave Heights through Jan 11, 2018
Amended to extend comment period through January 11, 2018
NWS is seeking user comments on the Experimental Enhanced
Coastal Waters Forecast Using Rayleigh Distribution for Wave
Heights through January 11, 2018. NWS Weather Forecast
Offices (WFO) in Southern Region are testing an experimental
enhancement to their Coastal Waters Forecast (CWF) including the
addition of wave height fields using the theoretical Rayleigh
Several different wave parameters can be inferred from this
distribution. Among these are the Significant Wave Height (HS)
and the average height of the highest 10 percent of waves
(H1/10) observed at sea, approximately 1.272 times the
significant wave height.
The current CWF product provides a forecast range of the
expected HS across the coastal waters. HS is defined as the
average height of the highest 1/3 of the waves. For example:
TONIGHT...NORTHWEST WINDS 13 TO 18 KNOTS BECOMING NORTHEAST
16 TO 21 KNOTS. SEAS 2 TO 4 FEET BUILDING TO 4 TO 6 FEET LATE.
DOMINANT PERIOD 6 SECONDS. INTRACOASTAL WATERS CHOPPY IN
EXPOSED AREAS.SLIGHT CHANCE OF SHOWERS.
Adding the H1/10 wave height to the CWF product will provide a
more descriptive and accurate assessment of the wave field
expected for any particular time across a given marine zone.
User knowledge of this information could reduce the number of
marine accidents at sea, saving lives. This new information
will follow this template:
HS with occasional H1/10 SEAS POSSIBLE.
.TONIGHT...NORTHWEST WINDS 13 TO 18 KNOTS BECOMING NORTHEAST
16 TO 21 KNOTS. SEAS 2 TO 4 FEET WITH OCCASIONAL 5 FEET
BUILDING TO 4 TO 6 FEET WITH OCCASIONAL 8 FEET POSSIBLE
LATE. DOMINANT PERIOD 6 SECONDS. INTRACOASTAL WATERS
CHOPPY IN EXPOSED AREAS. SLIGHT CHANCE OF SHOWERS.
These additions will be made available as part of the routine
forecast provided online at
and broadcast over NOAA Weather Radio All Hazards. NWS will not
provide this information through the point and click format.
Please provide comments regarding this CWF enhancement at:
Or email comments to:
Comments will be solicited through January 11, 2018. During
this comment period, a proactive effort will be made to educate
users and partners of the product availability and use. At the
end of the comment period, NWS will decide whether to extend the
comment period, make enhanced CWF an operational product, or
discontinue the enhancement.
For more information please contact:
Dr. Pablo Santos
Meteorologist in Charge
NWS Miami, FL 33165-2149
National Public Information Statements are online at: