Kilo and Loke Weaken to Tropical Depressions

Both Tropical Storms Kilo and Loke weakened on Saturday and were downgraded to tropical depression status.  At 5:00 p.m. EDT on Saturday the center of Tropical Depression Kilo was located at latitude 14.2°N and longitude 159.4°W which put it about 500 miles (805 km) south-southwest of Honolulu, Hawaii.  Kilo was moving toward the west-northwest at 15 m.p.h. (24 km/h).  The maximum sustained wind speed was 30 m.p.h. (50 km/h) and there were wind gusts to 40 m.p.h. (65 m.p.h.).  The minimum surface pressure was 1005 mb.

At 5:00 p.m. EDT on Saturday the center of Tropical Depression Loke was located at latitude 18.1°N and longitude 178.6°W which put it about 700 miles (1130 km) south of Midway Island.  Loke was moving toward the northwest at 8 m.p.h.  The maximum sustained wind speed was 35 m.p.h. (55 km/) and there were wind gusts to 45 m.p.h. (70 km/h).  The minimum surface pressure was 1003 mb.

Kilo appeared to be affected by vertical wind shear for much of Saturday.  A reconnaissance aircraft had a difficult time trying to find a surface circulation center and the spiral bands were not well developed.  Upper level easterly winds appeared to be pushing the tops of thunderstorms west of the low level circulation and inhibiting the formation of a warm core in the upper levels.  Recent satellite imagery suggests that more thunderstorms could be forming closer to the center of Kilo.  The vertical wind shear is forecast to decrease and Kilo could strengthen during the next few days.  A subtropical ridge is steering Kilo westward, but the ridge is expected to weaken and the steering currents could become weaker on Sunday.  Eventually, an upper level trough approaching from the northwest is forecast to pull Kilo toward the northeast early next week.

Loke appears to be very well organized for a tropical depression.  A primary rainband wraps around the western and southern side of the center of circulation and there appears to be about three quarters of an eyewall trying to form around the center.  The thunderstorms in the band are generating upper level divergence.  Loke is over warm Sea Surface Temperatures.  However, an upper level trough northwest of Loke is generating some southwesterly winds that are creating some vertical wind shear and are inhibiting upper level divergence south of the center of circulation.  That same upper level trough is expected to steer Loke toward the north-northeast during the next few days.  On it anticipated track Loke could be near Midway Island in about 60 hours.