Typhoon Atsani continued to grow bigger and stronger on Monday.  At 11:00 p.m. EDT on Monday the center of Typhoon Atsani was located at latitude 16.3°N and longitude 155.8°E which put it about 1700 miles (2740 km) southeast of Tokyo, Japan.  Atsani was moving west-northwest at 12 m.p.h. (19 km/h).  The maximum sustained wind speed was 130 m.p.h. (215 km/h) and there were wind gusts to 160 m.p.h. (260 km/h).  The minimum surface pressure was 937 mb.

Typhoon Atsani has a very well organized circulation.  It is very symmetrical with a well formed eye and eyewall and it has multiple rainbands spiraling around the center of circulation.  Upper level divergence is pumping out mass in all directions, which is allowing the surface pressure to decrease.  There is little vertical wind shear and Atsani is moving over warm Sea Surface Temperatures.  Further intensification is likely, although eyewall replacement cycles could cause fluctuations in intensity.

A subtropical ridge is steering Atsani toward the northwest and that general steering pattern is expected to continue for the next few days.  On its anticipated track Atsani will pass north of the Marianas and it could be east of Iwo To in three or four days.