NOUS41 KWBC 301700

PNSWSH

 

Service Change Notice 13-10

National Weather Service Headquarters Washington DC

1200 PM EST Wed Jan 30 2013

 

To:        Subscribers:

           -Family of Services

           -NOAA Weather Wire Service

           -Emergency Managers Weather Information Network

           -NOAAPort

           Other NWS partners and NWS employees

 

From:      Eli Jacks

           Chief, Fire and Public Weather Services Branch

 

Subject:   Enhanced Bulleted Format of NWS Storm Prediction

           Center (SPC) Public Watch Notification Messages (SEL)

           (CONUS Only) Effective April 16, 2013

 

Effective Tuesday, April 16, 2013, at 1500 Coordinated Universal

Time (UTC), the SPC will begin issuing Public Watch Notification

Messages (AWIPS ID SEL#, both the Public Severe Thunderstorm

Watch Notification Message and the Public Tornado Watch

Notification Message, with an enhanced bulleted format that

includes primary threat information statements.  These products

are issued only for the Continental United States (CONUS).

 

The Enhanced Bulleted Format is an initial step toward:

 

  1. Improved readability

  2. Consistency with convective warnings and other products

  3. Inclusion of more specific threat information

 

Threat information is based on the tornado, damaging wind, and

large hail watch hazard probabilities, and is intended to better

convey the severe weather risks for each watch.

 

The SPC Public Severe Thunderstorm Watch Notification Message and

the SPC Public Tornado Watch Notification Message will include

three bullets, each preceded by a left justified asterisk and a

single space. The bullets will provide:

 

-Watch type and an area description 

-Watch expiration time 

-List of primary threats in order of importance. 

 

All other text in the bulleted area will be preceded by two

spaces.

 

The SEL will include "...THIS IS A PARTICULARLY DANGEROUS

SITUATION..." between the second and third bullet when there is a

likelihood of multiple strong or violent (EF2 - EF5) tornadoes in

a tornado watch, or when conditions are favorable for widespread

significant non-tornadic severe weather events (convective winds

greater than 75 mph) in a severe thunderstorm watch.

 

Following the three bullets will be a paragraph with a general

area description including the axis of the watch.

 

The new format will also include Call-To-Action (CTA) markers

similar to other watch and warning products. The CTA markers will

use "PRECAUTIONARY/PREPAREDNESS ACTIONS..." and && character

strings to indicate the CTA beginning and ending, respectively.

The "PRECAUTIONARY/PREPAREDNESS ACTIONS..." and && character

strings will be left justified with no other characters on the

same line of text.

 

Following the CTA will be the following three sections:

 

OTHER WATCH INFORMATION...

DISCUSSION...

AVIATION...

 

The watch will end with:

 

...FORECASTER NAME

 

SEL examples with the Enhanced Bulleted Format are online at:

 

http://www.spc.noaa.gov/exper/SELhazard/

 

For more information, please contact:

 

   John Ferree

   NWS Severe Storms Services

   Norman, OK  73072

   john.t.ferree@noaa.gov

   405-325-2209

 

National Service Change Notices are online at:

 

http://www.weather.gov/os/notif.htm

 

$$