Discover and read the best of Twitter Threads about #Hispaniola

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1/9: Over the last 24 hours there have been large eastward shifts in #Dorian's track. It may now just clip #PuertoRico to the east! How?

Let's start with Dorian's vertical structure. One critical change is how vertically coherent Dorian's vortex has become, as seen below.
2/9: Here is another way to view it, this time from a lat-lon map. Over the last four GFS model cycles, the separation between the low & mid level centers of #Dorian decreases until they are on top of each other.

Correspondingly the low-level vortex migrates to the northeast.
3/9: Since #Dorian's vortex is more vertically stacked, it feels a deeper steering layer, moving it more north vs. the low-level flow.

Yesterday's 06z GFS run had a shallow vortex, & its steering was impacted by the low-level Caribbean trade winds (925-700-hPa) into #Hispaniola.
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