Your selection of options 1 and 3 is a strong interpretation of the haiku.
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Speaker is concerned about where the sun went - This is evident in the line, "Where did the sun go hide?" which indicates a sense of worry or curiosity about the sun's absence.
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Speaker is concerned by the approaching storm - The description of "dim, dangerous clouds" and the phrase "stampede across the sky" suggests that the speaker is indeed worried about the impending storm.
Option 4, "Mood is foreboding and fearful," could also be a valid interpretation since the imagery of dangerous clouds and the question about the sun's location contribute to a sense of foreboding.
So, while options 1 and 3 are appropriate choices, considering option 4 might provide a more comprehensive understanding of the mood conveyed in the haiku.