Sam Clucas set Mansfield on their way to a first home win since September at the expense of Southend in League Two.
Clucas latched on to Martin Riley's long ball to slot the opener underneath goalkeeper Daniel Bentley.
James Jennings fired home the second from close range after Bentley spilled Matthew Rhead's header.
Conor Clifford saw red for a foul on Rhead, before Ryan Leonard drilled in late on as the Shrimpers' eight-match unbeaten league run was ended.
VIEW FROM THE DRESSING ROOM
Southend United manager Phil Brown told BBC Essex:
"Difficult conditions, but when you are asking people to make decisions out there and you get them wrong constantly, it's nothing to do with the wind, it's nothing to do with Mansfield versus Southend.
"It almost looked like there was a conspiracy theory going on out there. We've had a couple of penalty decisions turned down, there's been a couple of really bad judgments.
"There was three teams on that park and two of them certainly didn't do themselves justice - ourselves, when we had the ball, and the referee and linesmen on numerous occasions with the decisions.
"The red card for Conor Clifford's an absolute disgrace. For me it was a very inexperienced decision."
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.