Where is this wind coming from?

We had the worst night ever last night. Though the skies are mostly clear--no real visible squalls--just passing clouds--the wind has been up and down to 25 knots all night. We spent the whole night with the genoa completely furled, and the staysail partly furled--and still going too fast for comfort. Neither of us got much sleep.

This wind is not reflected on the weather forecasts, and there are 'no significant features' on the surface map. We expected to have LIGHTER winds once we got south of 10 degrees north latitude.
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Sherry & Dave
Headed South for French Polynesia

At 5/6/2011 5:19 PM (utc) our position was 09°25.13'N 152°22.09'W
http://svsoggypaws.com/currentposition.htm