Keywords: JTWC wp1713.gif en 5day forecast trackmap for Super Typhoon 17W Usagi 2013-09-16 http //www usno navy mil/NOOC/nmfc-ph/RSS/jtwc/warnings/wp1713 gif not stable Joint Typhoon Warning Center / Naval Research Laboratory PD-USGov-Military-Navy Typhoon Usagi 2013 Tropical cyclone forecast tracks |