http://www.edd.ca.gov/jobs_and_training/Layoff_Services_WARN.htm#ListingofWARNNotices
View the "2015-2016 WARN Report (PDF): WARN notices processed from July 1, 2015 through April 10, 2016."
This file is updated the 10th and 25th of each month, it shows the number of employees impacted at each of the CA Intel Sites and is likely why Intel is communicating the formal site closures and/or impacted ees on the 25th as this is public information and if they don't begin communicating on Monday, people would be able to see this data for themselves...