NOUS41 KWBC 302007 AAA



Service Change Notice 17-09 Updated

National Weather Service Headquarters Washington DC

407 PM EST Mon Jan 30 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 Branch


Subject:   Cancelled: Impact Based Warnings (IBW) to become

           operational at all CONUS NWS Weather Forecast Offices

           (WFO) on February 28, 2017


Canceled: This product will remain experimental until further notice.


The NWS has been experimenting with the IBW format since 2014 at

a variety of WFOs. Successes with this format along with

comments received from the public, partners and social

scientists have all been positive. Due to the success of the

experiment, the NWS will go operational with the IBW format at

all the CONUS WFOs effective February 28, 2017.


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:

  Jim Keeney

  NWS Severe Storms Services

  Kansas City, MO 64153



National Service Change Notices are online at: