(NewsNation) — Several National Weather Radio transmitters remain out of service, with many in areas still set to be hit by severe weather.

The outage is resulting from the National Weather Service office in Birmingham conducting a required update to its Advanced Weather Interactive Processing System. The AWIPS displays and integrates weather and water information to send information and warnings to the public.

“During the time of the update, forecast operations will be conducted in conjunction with our service back-up office in Peachtree City, Georgia, to minimize any potential interruption to services,” NWS said in a press release. “No impacts to our core services of forecast products and weather watches, warnings and advisories are expected during this period.”

States like Kentucky, which just dealt with a freak Tornado outbreak, along with several others that stretch from Texas to Iowa, remain at risk of severe conditions.

The update is expected to last from May 19 until tomorrow.