Thread by @althecat

#HurricaneIan Update.

Additional extraordinary satellite observations.

As Hurricane Ian was making landfall in the Carolinas its atmospheric river exhaust was arriving in the Netherlands & Germany.

Even the most generous forecasts of the sheer extent of #Hurricane's impacts did not come close. As you can see here in the 12 hours after SC landfall, the Hurricane's remnants brought rain to all of West Virginia and Pennsylvania as well as NYC.

But that was not the end of it, in the evening and overnight yesterday the storm separated from its supporting atmospheric river and continued to revolve over Ohio, NC and Pennsylvania. The center of rotation appears to have been over WV and Eastern NC

By this time the outer limit of the outflow from the remnants of the Hurricane was covering most of the Great Lakes.

Here (getting us up till now) we see the rotation as it making its way slowly eastwards, bringing a rain band heading west over New Jersey, Pennsylvania & WV.

In this image we can see the atmospheric river is getting stronger again fed by both #HurricaneIan and a large area of convection over the Atlantic originating in Nicaragua.

Bottom center you can see the next hurricane candidate #Invest91L on a similar path to Ian.

Neither the ECMWF nor GFS models currently expect #Invest91L to develop into a cyclone fortunately. But it will need watching as it is in Hurricane Lane.

Finally the #HurricaneIAN remnant circulation may still have a sting in its tail, and as it leaves the U.S. for the final time it is forecast to have a final spin over Maryland.

This will bring more rain to some areas which have already received a lot of rain. Here are rain forecasts for Maryland, New Jersey and New York-Long Island.