NOUS41 KWBC 161811



Public Information Notice, Comment Request

National Weather Service Headquarters Washington DC

212 PM EDT Fri May 16 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 June 17, 2014, on the

           Storm Prediction Center (SPC) Experimental Day 4-8

           Severe Weather Outlooks


NWS is accepting comments on the SPC Experimental Day 4-8 Severe

Weather Outlooks. Examples of these Outlooks (using historical

data), additional information, and a link to provide user

comments are online at:


and via the Product Description Document:


Two changes are proposed to the SPC Day 4-8 Severe Weather

Outlook. Currently, a single graphic for all five days is

produced. The first proposed change is to have five separate

graphics, one for each individual day. These products are issued

for the CONUS only.  


The second proposed change is to include areas where the total

severe weather probabilities are at least 15 percent within 

25 statute miles of any point. Currently, the threshold for

denoting a "Severe" area in the Day 4 through 8 timeframe is

based on a 30 percent total severe threshold. That threshold will

be retained, and another probability, 15 percent, will be added

for areas where organized severe weather is possible. The

addition of the 15 percent threshold will result in more

consistency between the Day 4-8 graphic and corresponding text

discussion, and will help SPC communicate threats earlier in the

forecast process.


Comments will be accepted through June 17, 2014, online at:



Based on feedback, the experimental products will transition to

operational, be discontinued or adjusted and resubmitted for

another comment period.


For more information, please contact:


  John Ferree

  NWS Severe Storms Services

  Norman, OK  73072



  Steven Weiss

  NWS Storm Prediction Center

  Norman, OK  73072



National Public Information Notices are online at: