What megastorms? Did I miss anything?

GP might be referring to that http://www.scientificamerican.com/article/megastorms-could-d...

Megastorms Could Drown Massive Portions of California

Huge flows of vapor in the atmosphere, dubbed "atmospheric rivers," have unleashed massive floods every 200 years, and climate change could bring more of them

To busy to find links, but the gist is that Greenland Ice Sheet melting disrupts the conveyor currents that transport heat energy between the equator and the poles. Coupled w/ greater warming, the higher temperature differential would support stronger and more frequent cyclonic storms (supported by models, current trends, and archeological evidence).

"The total number of hurricanes (particularly after being adjusted for improvements in observation methods) and the number reaching the United States do not indicate a clear overall trend since 1878"

https://www3.epa.gov/climatechange/science/indicators/weathe...

"Trends in tropical cyclone activity in the Australian region (south of the equator; 90–160°E) show that the total number of cyclones appears to have decreased to the mid 1980s, and remained nearly stable since. The number of severe tropical cyclones (minimum central pressure less than 970 hPa) is dominated by variability with periods of lower and higher frequencies of occurrence."

http://www.bom.gov.au/cyclone/climatology/trends.shtml

"Similarly, the trend in intense tropical cyclones (minimum central pressure below 970 hPa) is not significantly different from zero."

https://www.ipcc.ch/ipccreports/tar/wg1/091.htm

Or did you mean current trends in something else?

Yep. All the falsifiable predictions have turned out to be, well, false.

I hope it would be earlier, 25-30 years maximum