NOUS41 KWBC 041619

PNSWSH†††††

Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

1120 AM EST Wed Dec 4 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 Maximum

†††††††† Wave Height in Great Lakes Open Lake Forecast

†††††††† (GLF) through June 18, 2014

NWS is seeking user comments on the Experimental Maximum Wave

Height in the Great Lakes Open Lake Forecast (GLF) through June

18, 2014. The NWS Weather Forecast Offices (WFO)s in Chicago

(LOT) and Detroit (DTX) are testing an experimental enhancement

to their Open Lakes Forecast (GLF). These WFOS are adding the

maximum wave height, expressed as occasional wave height, which

is the average of the highest 1/10 waves whenever wave heights of

six feet or higher are forecast. Currently, NWS typically

provides the significant wave height, which is the average of the

highest one-third waves, in marine forecasts.

The average wave height of the highest 1/10 of waves observed is

approximately 1.26 times the significant wave height. The

inclusion of H1/10 wave height into the GLF provides a more

descriptive and accurate assessment of the wave field expected

for any particular time across a given marine zone.

 

The current GLF product provides a forecast range of the expected

Significant Wave Height (HS) across the Open Lake waters. 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 H1/10 wave height to the GLF product, when

appropriate, 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 on the lakes, saving

lives.This new information will follow this template:

GLF: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 will be made as part of the routine forecast

provided online at the following Central Region WFOs:

 

WFO LOThttp://www.crh.noaa.gov/lot/

WFO DTXhttp://www.crh.noaa.gov/dtx/

††

and broadcast over NOAA Weather Radio All Hazards. This

information will not initially be provided through the point and

click format but will be added to these web displays in the

future.

 

For details on this product enhancement please see

 

http://products.weather.gov/viewExperimental.php?selrow=520

 

Please provide comments on this proposed enhancement at:

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

 

Comments will be solicited through June 18, 2014. During this

period, NWS will actively educate users and partners of the

productís availability and use.

 

At the end of the comment period, NWS will decide whether to make

WFOs Chicago and Detroitís Enhanced GLF an operational

product. At that time, the enhanced GLF will also be evaluated

for use at the three other WFOs that issue the GLF: Marquette

(MQT) in Central Region and Buffalo (BUF) and Cleveland (CLE) in

Eastern Region. This product will also be considered for possible

inclusion in the Great Lakes Nearshore Marine Forecasts (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

 

$$