 Midday on May 18 , the JTWC began to monitor an area of persistent disturbed weather associated with a broad low @-@ pressure area southwest of Chuuk . Within highly conductive conditions , the disturbance quickly organized and became classified as a tropical depression at 0000 UTC the following day . In its initial stages , the depression tracked slowly northeastwards . However , a shortwave trough forced a weakness in a nearby ridge , allowing for the storm to take a more streamlined , northward path . At 1200 UTC on May 20 , the JMA upgraded the depression to Tropical Storm Chan @-@ hom . Following the system 's naming , Chan @-@ hom temporarily meandered towards the northwest before resuming its northeasterly track . The next day , the storm began to develop an eye ; this was reflected with an upgrade by the JMA to typhoon status at 0600 UTC on May 23 . Gradual intensification followed , and at 1800 UTC that day Chan @-@ hom reached its peak intensity with maximum sustained winds of 155 km / h ( 100 mph ) and a minimum pressure of 940 mbar ( hPa ; 27 @.@ 76 inHg ) . 
 Midday on May 18 , the JTWC<a href='been_done' title='1'><mark></mark></a> began to monitor an area of persistent disturbed weather associated with a broad low @-@ pressure area southwest of Chuuk . Within highly conductive conditions , the disturbance quickly organized and became classified as a tropical depression at 0000 UTC the following day . In its initial stages , the depression tracked slowly northeastwards . However , a shortwave trough forced a weakness in a nearby ridge , allowing for the storm to take a more streamlined , northward path . At 1200 UTC on May 20 , the JMA upgraded the depression to Tropical Storm Chan @-@ hom . Following the system <a href='null_genetive' title='2'><mark>'s</mark></a>naming , Chan @-@ hom temporarily meandered towards the northwest before resuming its northeasterly track . The next day , the storm<a href='been_done' title='3'><mark></mark></a> began to develop an eye ; this was reflected with an upgrade by the JMA to typhoon status at 0600 UTC on May 23 . Gradual intensification followed , and at 1800 UTC that day Chan @-@ hom<a href='been_done' title='4'><mark></mark></a> reached its peak intensity with maximum sustained winds of 155 km / h ( 100 mph ) and a minimum pressure of 940 mbar ( hPa ; 27 @.@ 76 inHg ) . 
Midday on May 18 , da JTWC done began to monitor an area of persistent disturbed weather associated with a broad low @-@ pressure area southwest of Chuuk . Within highly conductive conditions , the disturbance quickly organized and became classified as a tropical depression at 0000 UTC the following day . In its initial stages , the depression tracked slowly northeastwards . However , a shortwave trough forced a weakness in a nearby ridge , allowing for the storm to take a more streamlined , northward path . At 1200 UTC on May 20 , tdaJMA upgraded thdaepression to Tropical Storm Chan @-@ hom . Following the system  naming , Chan @-@ hom temporarily meandered towards the northwest before resuming its northeasterly track . Thedat day , the darm been began to develop an eye ; dis was reflected w/ an upgrade by the JMA to typhoon status at 0600 UTC on May 23 . Gradual intensification followed , and at 1800 UTC that day Chan @-@ hom been reached its peak intensity with maximum sustained winds of 155 km / h ( 100 mph ) and a minimum pressure of 940 mbar ( hPa ; 27 @.@ 76 inHg ) .