[nws-changes] 20110203: Fwd: scn11-08 Tropical Watches and Warnings

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Service Change Notice 11-08

National Weather Service Headquarters Washington DC

1025 AM EST Thu Feb 3 2011



TO: Subscribers:

-Family of Services

-NOAA Weather Wire Service

-Emergency Managers Weather Information Network

-NOAAPORT

Other NWS partners and NWS employees



FROM: Therese Z. Pierce

Chief, Marine and Coastal Services Branch



SUBJECT: Changes to Watches and Warnings issued by

Weather Forecast Offices for tropical cyclones
in the Atlantic and Eastern Pacific hurricane basins:

Effective May 15, 2011



REFERENCE: SCN 11-07 issued February 3, 2011: Changes to the

Hurricane Local Statement format issued by Weather

Forecast Offices for tropical cyclones in the

Atlantic and Eastern Pacific hurricane basins:

Effective May 15, 2011



Beginning on May 15, 2011, in response to feedback from partners

and users and as the first phase in a long-term NWS plan to

unify the issuance of Tropical Cyclone Watches and Warnings, the

following changes will be made to tropical cyclone watches and

warnings issued by the NWS.



1. SERVICE CHANGES FROM WEATHER FORECAST OFFICES



a. Weather Forecast Offices (WFOs) will no longer issue

Tropical Cyclone Wind Watches and Warnings for affected inland

(public) zones in their areas of responsibility.



Specifically, the following watches and warnings will no longer

be issued by WFOs for inland zones:

Tropical Storm Wind Watch

Tropical Storm Wind Warning

Hurricane Wind Watch

Hurricane Wind Warning



The following Valid Time Event Code (VTEC) event names and

associated phenomena codes will be discontinued:

Tropical Storm Wind and phenomena code /TI/

Hurricane Wind and phenomena code /HI/



b. Beginning on May 15, 2011, WFOs will issue Tropical Cyclone

Watches and Warnings for inland (public) zones in their area of

responsibility.



Specifically, the following watches and warnings will be issued

by WFOs for inland zones via the WFO’s Hurricane Local Statement

(HLS) product:

Tropical Storm Watch

Tropical Storm Warning

Hurricane Watch

Hurricane Warning



The following VTEC event names and associated phenomena codes

will be issued by WFOs for inland zones effective May 15, 2011:

Tropical Storm and phenomena code /TR/

Hurricane and phenomena code /HU/



WFOs will issue Tropical Storm/Hurricane Watches for their

inland zones when tropical storm/hurricane force winds are

possible within 48 hours from a tropical cyclone. WFOs will

issue Tropical Storm/Hurricane Warnings when tropical

storm/hurricane force winds are expected within 36 hours from a

tropical cyclone.



The associated VTEC Event Tracking Numbers (ETNs) will be

unified for all tropical cyclone watches and warnings for inland

(public) zones, coastal (public) zones, and marine zones, for a

given event. In short, if the National Hurricane Center (NHC)

has issued a Tropical Cyclone Valid Time Event Code (TCV)

product, then the ETN in the TCV will be the same as the ETN in

all WFO-issued HLS products for the event.



These changes in WFO services will be reflected in the WFO’s HLS

products.



2. THERE IS NO CHANGE IN THE PROVISION AND DELIVERY OF TROPICAL

CYCLONE WATCHES AND WARNINGS FOR COASTAL (LAND) ZONES ISSUED BY

THE NHC. There is no change in the TCV products issued by NHC.



3. THERE IS NO CHANGE IN THE PROVISION AND DELIVERY OF HIGH

WIND WATCHES AND WARNINGS BY THOSE INLAND OFFICES ISSUING A NON-

PRECIPITATION WEATHER PRODUCT (NPW) IN TROPICAL CYCLONE

SITUATIONS.



4. THERE IS NO CHANGE IN THE PROVISION AND DELIVERY OF TROPICAL

CYCLONE WATCHES AND WARNINGS FROM NWS OFFICES IN THE CENTRAL AND

WESTERN PACIFIC HURRICANE BASINS.



If you have questions regarding this notice, please contact:



Timothy Schott

National Weather Service

Marine and Coastal Services Branch

1325 East West Highway, Room 13126

Silver Spring, Maryland 20910

301-713-1677 x122

Timothy.Schott@xxxxxxxx



National Service Change Notices are online at:



http://www.nws.noaa.gov/om/notif.htm



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