[EAS] NWS starts sending WEA for destructive thunderstorms next week

[Sean Donelan]

https://www.nytimes.com/2021/07/22/climate/national-weather-service-storm-alert.html

Thunderstorms that the National Weather Service deems "destructive" will 
trigger an emergency alert on smartphones as part of the agency's efforts 
to get people to protect themselves during severe weather [...]

https://www.weather.gov/news/072221-svr-wea

https://www.weather.gov/media/notification/pdf2/scn21-22svr_ibwaab.pdf

Updated to change implementation date to July 28, 2021, when the National
Weather Service (NWS) will implement new and enhanced features in the text
products of the Severe Thunderstorm Warning (SVR) and the Special Weather
Statement (SPS) for instances of sub-severe convective events. Although
there are changes in both products that require different levels of
attention by end users, they will be operationally enabled at the same
time across all NWS Weather Forecast Offices (WFOs).