2023/05/15
DM03-23.02 Addition of the Extreme Wind Warning to the Suite of Tropical Products Issued by WFO Guam

NOXX10 KWBC 091758
DM03-23.02

NOUS41/KWBC/231500
PNSWSH

Service Change Notice 23-21
National Weather Service Headquarters Silver Spring MD
1000 AM EST Thu Feb 23 2023

To: Subscribers:
    -NOAA Weather Wire Service
    -Emergency Managers Weather Information Network
    -NOAAPort
    Other NWS Partners... Users and Employees

From: Greg Schoor... Chief
      Marine... Tropical and Tsunami Services Branch

Subject: Addition of the Extreme Wind Warning to the Suite of
Tropical Products Issued by WFO Guam... Effective on or around May 
15... 2023

Effective on or around May 15... 2023... Weather Forecast Office
/WFO/ Tiyan... Guam will add the ability to issue an Extreme Wind
Warning /EWW/ based upon the similar criteria as WFOs in the
Atlantic and central Pacific basins.

WFO Guam will issue an EWW when both of the following criteria are
met:

- The current intensity designated by the Joint Typhoon Warning
Center /JTWC/ correlates to at least a category 3 or greater /96+ 
knots / 110 mph/ on the Saffir Simpson Hurricane Wind Scale.

- Sustained tropical cyclone surface winds of 100 knots /115 mph/ or
greater are occurring or expected to occur in WFO Tiyan... Guam’s
County Warning Area /CWA/ within one hour. The EWW is limited to
land areas in Guam... Rota... Tinian... and Saipan.

WFO Guam will issue the EWW under the following World Meteorological
Organization /WMO/ Identifier /ID/ and Advanced Weather Interactive
Processing System /AWIPS/ Product Identifier /PIL/:

Product Name WMO Heading AWIPS ID
------------- ----------- --------
Extreme Wind Warning WFPQ50 PGUM EWWGUM

More information on the format and content of the EWW can be found
in the National Weather Service Instruction /NWSI/ 10-601 - Weather
Forecast Office Tropical Products:

https://www.nws.noaa.gov/directives/sym/pd01006001curr.pdf

This directive will be updated by May 15... 2023... to reflect the
ability of WFO Guam to issue a EWW.

Please direct any questions regarding this notice to:

Jessica Schauer
NWS Tropical Services Program Manager
Marine... Tropical and Tsunami Services Branch
Miami... FL
tropical.program@noaa.gov

National Service Change Notices are online at:

https://www.weather.gov/notification/

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