200 - Typhoon Committee

TCAR
CHAPTER 1 - TYPHOON COMMITTEE ACTIVITIES 2007
2007
peripherals) were delivering by a local supplier in
August 2007.
Data collection and transmissions:
- National level: Public telephone, Email, Facsimile and
High Frequency (HF) radio transceivers network that are
used for domestic data collection and dissemination.
- International level: The connection between
Vientiane and Regional Telecommunication Hub
(RTH) Bangkok is by Global Telecommunication
System (GTS) under VCP of WMO. Total of 20
stations of synoptic data observation are
transmitting every day to Sub- regional II Bangkok
Thailand through GTS. The Weather Forecasting has
access to the Global Telecommunication System
Bangkok, SENERGIE server system that very useful
for forecasting. DMH receive only the observation
data from NHMs of Hanoi by Internet.
Tropical Cyclone Monitoring:
1.2
Implication to Operational Progress:
Meteorological network:
- Main Synoptic stations 17 (at provinces)
- Secondary Synoptic Climatological stations 33
(at provinces)
- Rain gauge 113 (at provinces)
- Doppler Radar 01 (at Head quarter DMH)
- MTSAT–1R Meteorological satellite receiver
station 01 (at Radar building DMH)
Synoptic data observation:
- Under inter Technical Meeting of DMH at the beginning
of 2007, the time of Synoptic data observation for 6
stations: Phongsaly, Oudomxay, Samneu, Phonhong, KM
20 and Paksan has been extended from 4 times (00, 03,
06, 09 UTC) in to 5 times (00 , 03, 06 , 09 and 12 UTC).
- Only 4 stations: Luangprabang, DMH head quarter,
Savannakhet and Pakse available 8 times synoptic
data (00, 03, 06, 09, 12, 15, 18 GMT).
- About 10 stations: Viengxay, Xiengkhuang, Luangnamtha,
Hoeixay, Xayaboury, Thakhek, Seno, Saravane, Attapeu
and Sekong available 4 times synoptic data (00, 03, 06,
09 GMT).
- Meteorological data quality Control under project of
TCP, JICA. The equipments (HF transceivers, PC and
Various observational data were applied to reveal
tropical cyclone monitoring such as:
- Meteorological observation data
- Weather maps
- Satellite imageries
- Doppler Radar data
- Utilize the typhoon forecast and NWP Products from
ECWMF, RSMC (JMA) Tokyo,
KMA, Hong Kong and other centre trough GTS and
Internet.
Tropical cyclone forecast methodology:
The forecasts and warnings for the whole country
are issued by the weather forecast Division at DMH
Headquarter. The forecast methodologies used are:
- Track forecasting method: by using the computation of
the current surface geostrophic steering of the tropical
cyclone and estimate of direction of motion.
- Pressure falling method: the use of pressure changes
can be especially helpful in short range forecasting.
- Operational Tropical Cycle analysis and forecasting:
With the utility of MTSAT in Tropical Cyclones, Department
of Meteorology and Hydrology has improved the
operational work in analysing satellite data imageries. The
procedure is based on the method delivered by Dvorak
technique. The weather forecasters use the determination
of the cloud pattern by applying to the typical model of
41