Public Information Statement
Issued by NWS National HQ

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NOUS41 KWBC 272014

Service Change Notice 17-90
National Weather Service Headquarters Silver Spring MD
414 PM EDT Thu Jul 27 2017

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

From:   Michelle Hawkins, Chief
   Severe, Fire, Public, and Winter Weather Services

Subject:   Impact Based Warnings (IBW) to Become Operational at
   NWS Pacific Region Offices Effective October 2, 2017

The NWS Pacific Region Weather Forecast Offices (WFOs) and
Weather Service Office Pago Pago, American Samoa, will transition
to the IBW format effective October 2, 2017. Alaska Region WFOs
will transition to the IBW format no later than December 31,
2017. The contiguous United States NWS WFOs transitioned
operationally to the IBW format on May 10, 2017. The NWS has been
experimenting with the IBW format since 2013 at a variety of
WFOs. Successes with this format along with comments received
from the public, partners, and social scientists have all been

Severe Thunderstorm Warning (SVR), Tornado Warning (TOR), and
Severe Weather Statement (SVS) products will be stratified into
categories distinguishing extreme cases from base convective
warnings. Additional enhanced wording will be included to convey
information about associated impacts, specific hazards expected,
and recommended actions, both within the bullet statements and as
part of the tag line codes.

Additional information and product examples are online at:

A Product Description Document (PDD) outlining the products is
online at:

For more information, please contact:

 Greg Schoor
 Acting NWS Severe Storms Services Program Leader
 Norman, OK 73072

National Service Change Notices are online at: is the U.S. government's official web portal to all federal, state and local government web resources and services.