NOUS41 KWBC 091555 AAB

PNSWSH     

 

Public Information Statement PNS13, Updated

National Weather Service Headquarters Silver Spring, MD

1155 AM EST Thu Mar 9 2017

 

To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network

         -NOAAPORT   

         Other NWS Partners and Employees

 

FROM:    Allison Allen, Chief, Marine, Tropical and Tsunami

         Services Branch

             

SUBJECT: Updated:  Soliciting Comments on the Experimental

         Maximum Wave Height in Great Lakes Open Lake

         Forecast (GLF) and Nearshore Forecast (NSH) through

         December 31, 2017

 

Updated to extend comment period through December 31, 2017, to

solicit additional user feedback to include the experimental

maximum wave height in the NSH and GLF at all Great Lakes

Weather Forecast Offices (WFO)s.

 

The NWS is seeking user comments on the inclusion of the

Experimental Maximum Wave Height in the GLF and NSH at all Great

Lakes WFOs through December 31, 2017. NWS WFOs in Chicago (LOT)

and Detroit (DTX) have been testing, on an experimental basis,

the addition of maximum wave height, expressed as occasional

wave height, to their GLF. This experimental enhancement will be

now be included in the GLF and NSH for all Great Lakes WFOs.

 

Currently, NWS typically provides significant wave height, which

is the average of the highest 1/3 of all waves, in marine

forecasts. The average wave height of the highest 1/10 of all

waves observed is approximately 1.26 times the significant wave

height. The inclusion of H1/10 wave height into the GLF and NSH

provides a more descriptive and accurate assessment of the

wave field expected for any particular time across a given

marine zone. 

 

The current operational GLF and NSH products provide a forecast

range of the expected Significant Wave Height (HS) across the

Great Lakes. HS is defined as the average height of the highest

1/3 of the waves. 

 

For example: 

 

.TONIGHT...NORTHWEST WINDS 15 TO 25 KT INCREASING TO GALES TO

35 KT LATE. WAVES 6 TO 9 FT. 

 

Adding the average wave height of the highest 1/10 of all waves

to the GLF and NSH products, when appropriate, will provide the

user with information that could reduce the number of marine

accidents on the lakes, saving lives.  This new information will

follow this template:

 

GLF and NSF:  HS with occasional H1/10 WAVES POSSIBLE. 

 

For example:

 

.TONIGHT...NORTHWEST WINDS 15 TO 25 KT INCREASING TO GALES TO

35 KT LATE. WAVES 6 TO 9 FT. OCCASIONALLY TO 11 FT. 

 

These additions are made as part of the routine forecast

provided online at the following Central Region WFOs and will be 

broadcast over NOAA Weather Radio All Hazards:

 

WFO Chicago (LOT):

http://www.weather.gov/lot/marine

 

WFO Detroit (DTX):

http://www.weather.gov/greatlakes/#.WHjuIH2kzRM

 

WFO Duluth (DLH):

http://www.weather.gov/dlh/marine

 

WFO Marquette (MQT):

http://www.weather.gov/greatlakes/#.WHjvsn2kzRM

  

WFO Gaylord (APX):

http://www.weather.gov/greatlakes/#.WHjwJH2kzRM

    

WFO Milwaukee (MKX):

http://www.weather.gov/mkx/local-marine

 

WFO Green Bay (GRB):

http://www.weather.gov/grb/marine

 

WFO Northern Indiana (IWX):

http://www.weather.gov/greatlakes/#.WHjyEH2kzRM

 

WFO Grand Rapids (GRR):

http://www.weather.gov/greatlakes/#.WHjyUX2kzRM

 

WFO Cleveland (CLE):

http://www.weather.gov/cle/Marine

 

WFO Buffalo (BUF):

http://www.weather.gov/greatlakes/#.WHjzBn2kzRM

 

For details on this product enhancement please see

 

http://products.weather.gov/PDD/PDDMaximumWaveHeightinGLF2017%20.pdf

 

 

Please provide comments on this proposed enhancement at:

 

http://www.nws.noaa.gov/survey/nws-survey.php?code=EMWHGLF

 

Comments will be solicited through December 31, 2017. During the

comment period, NWS will actively educate users and partners

about the product's availability and use.

 

At the end of the comment period, NWS will evaluate the enhanced

GLF and NSH for operational implementation at all Great Lakes

WFOs that produce the GLF and NSH.

 

For more information please contact:

 

Brian Hirsch

Transportation Sector Services Program Manager

Kansas City, MO 64153-2371

816-268-3149

Brian.Hirsch@noaa.gov

 

National Public Information Statements are online at:

 

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

 

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