Krakatoa 1943

Imperial Japan takes it in the Guts...
They had estimated that the explosion was approx. 200 Megatons of TNT in strength...

Weather systems goes out of whack and the climates suffers...
Temperature levels from the OTL stated that it dropped 2.2 degrees F.
The skies over the world was darkened by the eruption sunsets were supposedly spectacular and vividly red

Tsunamis will affect Sunda Strait, Java Sea and the Indian Ocean region...
 
A very interesting idea; I would think that initially there would be very little impact. Particularly with radio communication and at least some better understanding of volcanology it is doubtful if the ILN would have had any major units close enough to be seriously impacted. Any land units on the island or nearby would have had ample warning. The greatest destruction, apart from Krakatau and nearby islands was on the coast of Sumatra which was not very strategic during the war. Japan was evaluating New Georgia Island at the time but basically New Guinea was between New Georgia and Krakatau so no tidal wave (to use the 1943 term).

The longer term impact would have been through the impact on weather. Longer colder winters in 1943-1944 and 1944-1945 would have impacted the European Theater. A longer winter would have delayed the red Army’s June 1944 offensive but probably by only a few weeks. Weather impacts could have made the Battle of the Bulge a much different affair; although both sides would have been impacted. Food production would have taken a real hit. United States production would have remained sufficient to sustain the US Army and Britain, although perhaps at slightly lower caloric levels. Occupied Europe would have been really bad.
 
In the pacific the war was mostly going on in New Guinea and the Solomons. They won't notice much of the eruption. Japanese occupied Indonesia just became even worse for the POW's and population. convoys will be all messed up. Japan will loose a lot of much needed rare materials and oil.

But, if a Japanese or Allied fleet just happened to pass Krakatoa(highly unlikely in any scenario), then you got something interesting.
 
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