NOUS41 KWBC 131948



Public Information Statement, Comment Request

National Weather Service Headquarters Washington DC

350 PM EDT Thu Mar 13 2014


To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network


           Other NWS Partners and NWS Employees


From:      Eli Jacks

           Chief, Fire and Public Weather Services Branch


Subject:   Soliciting Comments until November 4, 2014, on

           Expanded Experimental Impact Based Warnings


NWS is accepting comments beginning Tuesday, March 25, 2014, and

continuing through November 4, 2014, on an expansion of its

Experimental Impact Based Warnings. All 38 NWS Central Region

(CR) Weather Forecast Offices (WFOs), 5 NWS Southern Region WFOs

(Norman, OK; Tulsa, OK; Jackson, MS; Lubbock, TX and San Angelo,

TX); 1 NWS Eastern Region WFO (Blacksburg, VA); and 2 NWS Western

Region WFOs (Great Falls, MT and Glasgow, MT) will issue enhanced

convective warnings.


This is an expansion of the NWS CR Experimental Impact Based

Warning demonstration in 2012 and 2013:


Based on feedback from the CR 2013 Experimental Impact Based

Warnings, the 2014 demonstration will include some changes. The

most significant change for the 2014 national experiment is that

the impact statements for "CONSIDERABLE" and "CATASTROPHIC" serve

as markers of confidence of tornado occurrence, with both

reflecting an "elevated tier" of tornado damage and risk.  The

term "CATASTROPHIC" will only be used when a tornado is actually

striking a community.


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:


Please submit comments to:


Based on demonstration results, the Impact Based Warnings are

being considered for implementation on a national basis. After

the experimental period is completed and the comment period

closes, NWS will evaluate all comments to determine whether to

implement the Experimental Impact based warnings as operational



For more information, please contact:


   John Ferree

   NWS Severe Storms Services

   Norman, OK  73072



National Public Information Notices are online at: