Public Information Statement
Issued by NWS National HQ

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NOUS41 KWBC 021856

Public Information Statement, Comment request
National Weather Service Headquarters Washington DC
158 PM EST Mon Mar 2 2015

To:         Subscribers:
            -Family of Services
            -NOAA Weather Wire Service
            -Emergency Managers Weather Information Network
            Other NWS Partners and NWS Employees

From:       Mark Tew
            Chief, Marine and Coastal Weather Services Branch

Subject:    Soliciting Comments by April 1, 2015, on a Proposed
            Change to the Issuance of the Tropical Cyclone
            Public Advisory

The NWS is soliciting comments through April 1, 2015, on a
proposed change to the issuance of the Tropical Cyclone Public
Advisory (TCP) issued by the National Hurricane Center, Central
Pacific Hurricane Center, and WFO Guam.

Current NWS policy states that the TCP will be issued at 2-hourly
intervals whenever coastal tropical cyclone watches/warnings are
in effect and coastal radars are able to provide reliable center
position estimates. In addition, when TCPs are issued on a
2-hourly cycle, a Tropical Cyclone Update (TCU) is issued in
between each TCP to provide a continuous (hourly) flow of
information on the tropical cyclone location, motion and
intensity. The TCU may also contain additional information as

When the center of a tropical cyclone cannot be easily tracked
with land-based radar, NWS issues TCPs every 3 hours rather than
every 2 hours.  The uncertain nature of the TCP schedule
sometimes creates confusion with users.

The NWS proposes that the TCP always remain on a 3-hourly cycle
whenever watches/warnings are in effect or a tropical cyclone is
over land at tropical storm strength or greater. Elimination of
the 2-hourly TCP cycle would ensure NWS issues the TCP at
standard times during such an event.

Under this proposal, the hourly flow of storm information would
not be disrupted; TCUs would continue to be issued hourly in
between the three-hourly TCPs whenever coastal watches/warning
were in effect and the center could be easily tracked with land-
based radar. Because TCUs can be prepared and disseminated more
quickly than TCPs, the proposed change would alleviate workflow
issues while the new track and intensity forecast is being
prepared and facilitate quickly conveying storm updates to users.

This change will not limit or restrict the issuance or
discontinuation of watches and warnings. Warnings for the United
States can only be issued on full or special advisory packages,
while U.S. warnings can be lowered on either an intermediate
advisory or a TCU.

Below is an example of the proposed NHC and CPHC advisory cycle
for storms meeting the watch/warning and center-tracking
requirements (Guam times will be 1 hour later):

0900 UTC    Full advisory package including the TCP
1000 UTC    TCU (providing an hourly position update, summary
            block of key storm information and other key
1100 UTC    TCU
1200 UTC    Intermediate Public Advisory
1300 UTC    TCU
1400 UTC    TCU
1100 UTC    Next full advisory package

Please send comments on the proposed change to:

John Kuhn
NWS Marine and Coastal Weather Services Branch
Silver Spring, MD  20910
Telephone:  301-427-9364

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