The National Police Air Service has condemned Nigel Griffiths' use of a laser pen as "stupid and reckless".
"The sentence itself should act as a deterrent to others who should look at this and think this is not a game" says Chief Supt Ian Whitehouse.
"Real people's lives are put at risk. Anyone who takes it upon themselves to shine a laser at an aircraft will result in being arrested, being prosecuted and will get a criminal record".
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The heaviest bursts are expected in the south and east, with some western areas either remaining dry or becoming dry by dawn.
Many places will start dry, but rain in the southeast will spread to most for a time overnight.
The family of Isaac Nash who went missing after being swept out to sea last summer have presented a cheque for £10,000 to the RNLI.