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Late on September 17, a tropical disturbance formed east of Guam. Early on September 20, the JMA upgraded the low-pressure area to a tropical depression, just after the JTWC issued a TCFA on the system. Eight hours later, the PAGASA also upgraded the system to a tropical depression named it Lawin, before the JTWC also upgraded it to a tropical depression. Late on the same day, the JMA upgraded the system to a tropical storm and named it Jelawat, so did the JTWC. Only a half of day later, the JMA upgraded Jelawat to a severe tropical storm on September 21. Early on September 23, both the JMA and the JTWC upgraded Jelawat to a typhoon as it started to undergo explosive intensification, from a category 1 typhoon, to a category 4 typhoon in 12 hours, as it developed a small eye. Early of September 25, as the system continued to strengthen, the JTWC upgraded the system to a category 5 super typhoon, as Jelawat developed an symmetrical, well defined eye at 50 kilometers wide, after a few eyewall replacement cycles. On September 26, the JTWC downgraded the system to a Category 4 super typhoon, and it soon started to undergo its fourth eye wall replacement cycle, which lasted 15 hours. The eye ended up at 70 kilometers across.
CURRENT STORM INFORMATION
Time/Date: 5:00 AM PhT Mon October 01, 2012
Location of Center: 40.0º N Lat 143.0º E Lon
Distance 1: 262 km (NE) away from Sendai, Japan
Distance 2: 369 km (SSE) away from Sapporo, Japan
Distance 3: 559 km (NNE) away from Tokyo, Japan
Distance 4: 756 km (SW) closer to Kuril Islands
MaxWinds (1-min avg): 75 kph (40 kts) near the center
Peak Wind Gusts: 95 kph (50 kts)
Present Movement: NNE @ 72 kph (39 kts)
Towards: Sea south of Kuril Islands
NOAA 24hr Rainfall Accum (near center): 100 mm (High)
Minimum Central Pressure: 993 millibars (hPa)
Saffir-Simpson Typhoon Scale: Tropical Storm
Size (in Diameter): 945 km (510 nm) [Very Large]
Wind Area Distribution (in Knots): Current Wind Profile
Max Sea Wave Height (near center): 30 ft
Possible Storm Surge Height: 1-3 ft (0.3-0.9 m)
T2K StormTracks (for Public): Google Map (Flash) | GIF (for Philippines only)