NOUS41 KWBC 161809

PNSWSH†††††

Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

210 PM EDT Mon Sep 16 2013

To:††††† Subscribers:

†††††††† -Family of Services

†††††††† -NOAA Weather Wire Service

†††††††† -Emergency Managers Weather Information Network

†††††††† -NOAAPORT†††

†††††††† Other NWS Partners and Employees

FROM:††† Mark Tew

†††††††† Chief, Marine and Coastal Weather Services Branch

SUBJECT: Soliciting Comments on the Experimental Enhanced

†††††††† Coastal Waters Forecast Using Rayleigh Distribution

†††††††† for Wave Heights through June 18, 2014

 

NWS is seeking user comments on its Experimental Enhanced

Coastal Waters Forecast Using Rayleigh Distribution for Wave

Heights through June 18, 2014. Selected NWS Weather Forecast

Offices (WFO)s in Southern Region, currently WFOs Miami and

Tallahassee, are testing an experimental enhancement to their

Coastal Waters Forecast (CWF), additional wave height fields

using the theoretical Rayleigh Distribution.

 

NWS can infer several different wave statistics from this

Distribution such as 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.

 

For example:

 

.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

 

http://www.srh.noaa.gov/mfl/

 

http://www.srh.noaa.gov/tlh/

and broadcast over NOAA Weather Radio All Hazards.This

information will not be provided through the point and click

format.

 

Comments regarding this enhancement to the CWF can be provided

at:

 

www.nws.noaa.gov/survey/nws-survey.php?code=SRERD

 

NWS is seeking comments through June 18, 2014. 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 make

Southern Regionís Enhanced CWF an operational product. Other NWS

Southern Region WFOs may join this test.Further Public

Information Statements will be issued as needed.

 

For more information please contact:

 

Melinda Bailey

Public/Marine Meteorologist

National Weather Service

Southern Region Headquarters

Fort Worth, TX 76102

817-978-1100 X107

Melinda.Bailey@noaa.gov

 

National Public Information Statements are online at:

http://www.weather.gov/os/notif.htm

 

$$