There are seven picket lines at county council buildings in West Sussex, including Centenary House, in Durrington and Glebelands, in Shoreham.
Fifty-nine schools have been reported to the authority as either closed, or partially closed.
Firefighters remain on strike until 7pm this evening. Contingency measures are in place but the public are advised to take extra care.
Information is being updated on the council’s website at www.westsussex.gov.uk
The county council’s call centre remains open as normal.