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Here is the sequel to my steering flow animated explanations. I'm covering 2 periods.
1st period is when #Dorian is expected to stall.
3 Features Cancel out:
1) Ridge over the NATL
2) Ridge over the Midwest
3) Trough that creates a weakness between the two ridges.
1st period is when #Dorian is expected to stall.
3 Features Cancel out:
1) Ridge over the NATL
2) Ridge over the Midwest
3) Trough that creates a weakness between the two ridges.
So naturally the next question is, what causes the #Dorian to start moving again?
Essentially one ridge becomes stronger (NATL ridge), while the other one weakens (Midwest US), with progressive troughs making sure the weakness stays open. Breakdown below⬇️
Essentially one ridge becomes stronger (NATL ridge), while the other one weakens (Midwest US), with progressive troughs making sure the weakness stays open. Breakdown below⬇️
So in retrospect, it's not the trough picking up the storm, but rather the transient troughs provide a weakness that then gives #Dorian a path to then be directed around the clockwise circulation of the NATL ridge.
As usual, my data comes from @NOAANCEIclimate using the NOMADS server to download the 1200 UTC 1 September 2019 run of the GFS-FV3.
