NOUS41 KWBC 301448 CCA

PNSWSH     

 

Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

1048 AM EDT Wed May 30 2012

 

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: Corrected: Soliciting comments on the Experimental

         Enhanced Coastal Waters Forecast Using Rayleigh

         Distribution for Wave Heights through November 30, 2012

 

Corrected secondary contact email to sr-mfl.marine@noaa.gov

 

NWS is seeking user comments on the Experimental Enhanced

Coastal Waters Forecast Using Rayleigh Distribution for Wave

Heights through November 30, 2012. The NWS Weather Forecast

Office (WFO) in Miami is testing an experimental enhancement to

its Coastal Waters Forecast (CWF), additional wave height fields

using the theoretical Rayleigh Distribution.

 

Several different wave statistics can be inferred from this

distribution.  Among these, 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/

 

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=MIAERD

 

Or send comments to:

 

Sr-mfl.marine@noaa.gov

 

Comments will be solicited through November 30, 2012. 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 WFO

Miami Enhanced CWF an operational product.  At that time, the

enhanced CWF will also be evaluated for use at other WFOs and

regions.

 

For more information please contact:

 

Dr. Pablo Santos

Meteorologist in Charge

National Weather Service

Miami, FL 33165-2149

305-229-4500

pablo.santos@noaa.gov

 

National Public Information Statements are online at:

 

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

 

$$