The Environment Agency offer a free flood warning service which will send phone/text/email alerts when a flood is likely. However, in order to sign up, you need a postcode.
Jesus Green/Jubilee Gardens: CB4 3BD
Midsummer Common: CB4 1HA
Riverside: CB5 8HL
Stourbridge: CB4 1BS
Two Tees Boatyard: CB4 1PA
Brown's Field: CB5 8SX
Horningsea: CB24 6AF
Stay safe and look out for your neighbours!