WASHINGTON — Global warming is leading to such severe storms, droughts and heat waves that nations should prepare for an unprecedented onslaught of deadly and costly weather disasters, an international panel of climate scientists says in a report issued today.

The greatest danger from extreme weather is in highly populated, poor regions of the world, the report warns, but no corner of the globe is immune.

The document by a Nobel Prize-winning panel of climate scientists forecasts stronger tropical cyclones and more frequent heat waves, deluges and droughts.

The 594-page report blames the scale of recent and future disasters on a combination of man-made climate change, population shifts and poverty.

In the past, the Intergovernmental Panel on Climate Change, founded in 1988 by the United Nations, has focused on the slow inexorable rise of temperatures and oceans as part of global warming.

This report by the panel is the first to look at the less common but far more noticeable extreme weather changes, which recently have been costing on average about $80 billion a year in damage.