JTWC Report PDF - Weather Underground

TYPHOON ED(07W)Typhoon Ed, like its predecessor TyphoonDinah, originated from a mid-latitude system.Forming just south of Japan, Ed initiallymoved to the southeast, a very unusualdirection of movement for tropical cyclonesin the northwest Pacific. After brieflyinteracting with Typhoon Dinah, Ed turned tothe west-northwest, a course it maintaineduntil it made landfall on the east coast ofChina.The disturbance which eventuallydeve oped into Ed began as an area ofconvtction at the southern end of adissipating cold front transiting Japan.Although the convection was first noticedon 23 July, it was not until late c?nthe24th that the cloud mass became detachedfrom the front and showed signs of becominga tropical disturbance. At 0000Z on the25th, synoptic data indicated a surfacecirculation had formed, with an MSLP near1002 mb. Satellite imagery and synopticdata indicated an upper-level anticyclonehad developed over the disturbance providingexcellent outflow to the south. Thesedevelopments prompted the SignificantTropical Weather Advisory (A13EHPGTW) to bereissued at 250135Z in order to include thissystem as a suspect area. The potential forsignificant tropical cyclone development wasassessed as being “fair”. Indeed this wasan understatement. The area rapidlytransitioned from an extratropical featureto a tropical depression as the convectionincreased and became more organized. At250600Z, synoptic data showed surfacepressures had decreased to 999 mb andDvorak satellite intensity analysis estimatedthat surface winds of 30 kt (15 m/s) werepresent. Consequently a TCFA was issued at250745Z. The disturbance continued todevelop overnight and the first warning onEd was issued at 1800z on the 25th.While Ed was developing, Typhoon Dinahlocated approximately 900 nm (1667 km) tothe southeast, was moving to the west andintensifying. The first five warningsforecast Ed to move generally towards Dinah,remain weak and eventually be assimilatedinto Dinah’s inflow. However, Ed did notremain weak but continued to intensify as itmoved to the southeast. Aircraft reconnaissanceat 252219Z found Ed had deepened to985 mb and was supporting winds of 40 to 50kt (21 to 26 m/s). Ed maintained a 50 kt(26 m/s) intensity during the next 24 hoursas it moved closer to Dinah. Throughoutthis period, Ed’s outflow remained very wellorganized and was elongating to the easttowards Dinah. This outflow had a significantshort term effect on Dinah’s convectionand intensity early on the 27th.During the 26th, a short-wave troughmoved eastward across the Sea of Japan. Inresponse to the trough, Ed turned to thenorth while maintaining its intensity. By270000z, the trough had moved to the northeastand was weakening. Ed now came underthe influence of a mid to low-level ridgeeast of Japan. This ridge kept building tothe west and forced Ed to move to the westnorthwestta course it maintained untillandfall.While moving to the west Ed slowlyintensified, reaching its peak intensity of100 kt (51 m/s) shortly after passing southof the island of Kyushu (Figure 3-07-1). AsEd transited the East China Sea, entrainmentof drier air and passage over cooler watersbegan to weaken the system. At 0900Z on the31st, Ed made landfall approximately 60 nm(111 km) north of Shang-Hai (WMO 58367).Maximum sustained winds at landfall were 60kt (31 m/s). After making landfall, Edturned to the northwest, transited alongcoastal China and gradually dissipated. Thefinal warning was issued at 1200z on the 1stof August.The only known damage caused by TyphoonEd occurred to shipping. The Korean registeredIshlin Glory enroute from Pohang,South Korea to Nagoya, Japan sank in theKorea Strait on 29 July. One crew member isknown dead, with eleven others reportedmissing.FLgcuuz 3-07-1. Typhoon Ed neulmaximumitiwialj(292242ZJ~Y NOM V.i.b@tigtiy).39