~ However the deadliest most destructive one
~ This is why sea ice and glaciers are important
From the very successful 2019 mid April EH2r yearly Northern Hemisphere summer projection:
the North Pole High pressure was expected at end of September. Given the current Arctic Ocean sea ice extent is what is left from the 2nd greatest melt in history (to date). The left over Arctic basin pack is creating a cold zone. However the big news is slow circulation:
"The speed of tropical cyclones around the world has decreased globally by about 10 percent since 1949."
Further South in the populated world, this slowing is even more significant. I have been observing this sluggish pace slow to a crawl, particularly at the State of Texas latitude:
consequences, Hurricane Harvey's $125 billion in damages had to be paid by someone, namely increasing insurance premiums and taxes, by the common people.
Once again the work here by EH2r research explains this planetary change, the Polar Vortex extent is shrinking, this leaves its geographical imprint for weather circulation much diminished. With the event horizon of the Vortex reach not as wide, all systems slow, and some stall. The key is measuring how cold the Arctic is particularly at winter's peak, this was done every year since 2001 by measuring vertical sun disk sizes which were increasing from year to year, because the over all Arctic air became less and less dense. But latest developments made sun disk vertical dimensions smaller, since the center of the vortex is shrinking and getting colder nearest to Greenland, where I measure the sun. Of the latest 2 end of winters, the vortex was surrounded by warmer air, by this action it became more stable, not traveling a lot and far in the usual huge Arctic winter zone. Of late, the vortex is like a steady top spinning in place instead of a wildly gyrating wobbling one, insidiously creating winter's last stand smaller but more stable especially more fierce at its center, this 'not moving' bit extends later in time as well, particularly for summer, making long term forecasts easier, especially for this writer. WD September 17 2019