Friday, August 17, 2012

Typhoon KAI-TAK [HELEN] - Update #016


for Friday, 17 August 2012 [7:44 PM PhT]

Typhoon2000 (T2K) NEWS (Monday August 13, 2012):

Currently issuing 6-hrly web, SMS, email, & iTyphoon app updates (except 12 Midnight) on KAI-TAK (HELEN).


+ USA (JTWC/1-min avg): 120 km/hr
+ Japan (JMA/10-min avg): 110 km/hr
+ Philippines (PAGASA/10-min avg): -- km/hr
+ Beijing (NMC/2-min avg): 120 km/hr
+ Taiwan (CWB/10-min avg): 105 km/hr
+ Korea (KMA/10-min avg): 110 km/hr

+ Hong Kong (HKO/10-min avg): 120 km/hr
:: Click here to see Multi-Agency Forecast Tracks


5:00 PM PhT (09:00 GMT) Fri 17 August 2012
Sources: T2K Analysis/JTWC Warnings/Dynamic Models/SatFixes
View: T2K TC Update Archives (2004-2012)
The weakening Typhoon KAI-TAK (HELEN) has passed swiftly across Leizhou approaching Northern Vietnam while moving along the shores of Guangxi Province in the Gulf of Tonkin. Typhoon Conditions continuing along the path of this cyclone.

Residents and visitors along Southern China particularly Guangxi and Guangdong Provinces and Northern Vietnam should closely monitor the progress of KAI-TAK (HELEN).

Do not use this for life or death decision. This advisory is intended for additional information purposes only. Kindly refer to your country's official weather agency for local warnings, advisories & bulletins.


Time/Date: 5:00 PM PhT Fri August 17, 2012
Location of Eye: 21.5º N Lat 108.6º E Lon
Distance 1: 62 km (E) closer to the Vietnamese-Chinese Border
Distance 2: 295 km (ENE) closer to Hanoi, Vietnam
Distance 3: 188 km (WNW) away from Zhanjiang, China
Distance 4: 235 km (NW) away from Haikou, Hainan
Distance 5: 246 km (NNW) away from Danzhou, Hainan
Distance 6: 267 km (N) away from Dongfang, Hainan
Distance 7: 522 km (WSW) away from Macau
Distance 8: 583 km (WSW) away from Hong Kong
MaxWinds (1-min avg): 120 kph (65 kts) near the center
Peak Wind Gusts: 150 kph (80 kts)
Present Movement: WNW @ 30 kph (16 kts)
Towards: Northern Vietnam
CPA [ETA] to Northern Vietnam: Saturday Morning [6AM PHT]
NOAA 6hr Rainfall Accum (near center): 120 mm (High)
Minimum Central Pressure: 974 millibars (hPa)
Saffir-Simpson Typhoon Scale: Category 1
Size (in Diameter): 665 km (360 nm) [Average]
Wind Area Distribution (in Knots): Current Wind Profile
Max Sea Wave Height (near center): 15 ft
Possible Storm Surge Height: 4-5 ft [1.2-1.7 m]
T2K StormTracks (for Public): Google Map (Flash) | GIF
(for Philippines only)


KAI-TAK (HELEN) is expected to continue moving generally WNW throughout the forecast period, with some fluctuations in its forward speed. On the forecast track, the core of KAI-TAK will make landfall over the Vietnamese-Chinese Border on or before midnight and will traverse the rugged terrain of Northern Vietnam through Sunday.

Maximum Sustained Winds (1-min. avg) have decreased to near 120 km/hr (65 knots) with higher gusts. Continued decrease in strength will be expected...and KAI-TAK will weaken into a Tropical Storm tonight...and dissipate into an area of Low Pressure on late Saturday night or early Sunday.

Tropical Storm Force Winds (62-100 km/hr) extend outward up to 150 kilometers (80 nautical miles) from the center. KAI-TAK is a large-sized tropical cyclone with a diameter of 665 kilometers (360 nautical miles) across.

The following is the summary of the 1-day forecast outlook on this system:

SATURDAY EVENING: Just a weak Tropical Storm (TS)...moving across the northernmost part of Northern Vietnam...about 275 km NW of Hanoi City [5PM AUG 18: 22.4N 103.6E @ 65kph].

*Please be reminded that the Forecast Outlook changes every 6 hours, and the Day 3 Forecast Track have an average error of 250 km...while the wind speed forecast error, averages 35 kph per day. Therefore, a turn to the left or right of its future track and changes in its wind speed must be anticipated from time to time.


Below is the summary of the storm's parts and its hazards affecting specific areas. You can also view this image link for you to understand the parts.

CLOUD-FILLED EYE - just along the shores of Guangxi Peninsula. Possible calm and lull conditions (with <20 kph winds) will be expected inside the eye (click here to know more about the EYE).
EYEWALL - affecting the southern part of Guangxi Province and the NE most part of Northern Vietnam. Typhoon Conditions with Typhoon Force Winds (>118 kph) will be expected within this wall (click here to know more about the Eyewall).
INNER RAINBANDS - affecting and spreading across the Rest of Guangxi & Western Guangdong particularly the rest of Leizhou Peninsula, Northernmost part of Vietnam and Northern part of Hainan Island. Tropical Storm Conditions with Tropical Storm Force Winds (62-118 kph) will be expected along these bands.
OUTER RAINBANDS - affecting & spreading across Northern Vietnam, Rest of Guangdong and Hainan Island. Cloudy/Rainy Conditions with moderate to strong winds (<62 kph) will be expected along these bands (click here to know more about Rainbands).
6HR TOTAL RAINFALL ACCUMULATION - from 5 up to 50 mm (low to moderate rainfall) can be expected along areas affected by the outer & inner rainbands (see above)...with isolated amounts of 51 to 120 mm (moderate to high) along areas near the center of Kai-tak (Helen) (click to open NOAA's eTRaP graphic).
COASTAL STORM SURGE FLOODING - possible 4-5 ft (1.2-1.7 m) above normal tide levels...accompanied by large and dangerous battering waves can be expected along the coastal, inland lakes and beach front areas of Northern Vietnam, Guangxi Province including Hainan Island. Minimal damage is likely on this type of storm surge. Danger from Rip Currents or Rip Tides can be expected along the rest of the beach-front areas of Southern China, Taiwan & Vietnam
(click here to know more about Storm Surge).

Important Note: Please keep in mind that the above forecast outlook, effects-hazards, current monsoon intensity, & tropical cyclone watch changes every 6 to 12 hrs!

External Links for TY KAI-TAK (HELEN)

PAGASA: Hourly Updates
View NOAA-CIRA's: Latest Full Wind Analysis
JTWC Latest Tracking Chart: wp1412.gif
Multi-Agency Forecast TrackMap: Near Real-Time
TSR Wind Probabilities: Current to 1 Day Ahead
JAXA TRMM Page: Latest Rainrate (in mm/hr)
NASA TRMM Page: Kai-tak's Rainrate Archives (in mm/hr)
Zoomed Satellite Pic: NOAA's Near Real-Time
Wunderground Animation: 6-12 hr. GIF Loop







>> To know the meteorological terminologies and acronyms used on this update visit the ff:

For the complete details on Typhoon KAI-TAK (HELEN)...go visit our website @:


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