If Operation Downfall, slated for October 1945, went through, how much disruption would Typhoon Louise have caused to the invasion force?
http://www.history.navy.mil/faqs/faq102-6.htm
If the invasion has already begun, how much disruption would this cause the flow of supplies and reinforcements to the landings?
Also, how much heart would this have given Japan's defenders? Given the previous typhoons that disrupted the Mongol invasion, would they think the gods had intervened on their side at last?
This is for a project I've discussed involving Japan being so depopulated by an ATL Allied invasion that the U.S. ends up annexing it, only to face an attempt by nationalist-infiltrated National Guard units to pull a
Teutobergerwald on regular American troops and regain independence sometime in the 1970s.
My current idea is that the Kyushu beachhead is established but the typhoon disrupts the flow of reinforcements and supplies. The "third kamikaze" gives the Japanese defenders heart and they attack the beachhead, requiring massive atomic fire support to save it.