Contingency plans are being put in place across the Anglia region as firefighters prepare to take part in a four hour nationwide strike.
It's in a row over pension plans.
Emergency calls will still be answered but there may be no response between 12pm and 4pm to calls about things like gas leaks and flooding.
More top news
Cambridge diver Daniel Goodfellow, a TeamGB Olympian, is encouraging people to get involved in 'the nation's biggest sports day'
It's going to feel fresher today although generally dry with sunny spells- just the chance of an isolated shower. Highs of 22 deg C.
Lifeguards at Sea Palling where a swimmer died after getting caught in a rip-current, remind people to always swim at life-guarded beaches.