UPDATE - 12/01/2020: You now can choose either OWM or weather.gov as the source for Weather Alerts. weather.gov only provides alerts for the United States while OWM provides global weather alerts (see link below).
UPDATE - 10/20/2020: OpenWeatherMap now provides global weather alerts. As of version V0.2.2 this driver uses OWM for all of it's external forecast data and no longer polls weather.gov (NWS) for weather alerts. This means that weather alerts are available from global sources as specified on OWM's documentation here, and alerts are no longer with limited to the United States only.
REQUIREMENTS: You MUST have a Personal Weather Station (PWS) and use Weather-Display software to capture that weather data from your network or a web server. If you do not meet this requirement then this driver will not work for you. This uses the Weather-Display data files from a webserver you specify in the driver preferences. I used waynedgrant's work to make those data files available in JSON format (GitHub - waynedgrant/json-webservice-wdlive: JSON formatted Web Service API to expose Weather Display Live data. Written in PHP.).
This is the initial release of my driver that changes the forecast/alert source from DarkSky.net to OpenWeatherMap.org and NWS (weather.gov). This initial release only intends to replicate the functionality of the Weather-Display With Darksky.net Forecast Driver as much as possible.
The driver has been added to the Hubitat Package Manager for installation and updates.
Please report any issues/bugs in this thread. Thanks.