Weather Advisory
Subject: Storm “RAGASA”
and heavy to very heavy rain in Thailand
No.1 (249/2025)
------------------------
At 04.00
p.m. LST (22 September 2025), the north of Luzon, Philippines
or at latitude 19.5 degrees north and
longitude 121.1 degrees east with maximum sustained winds
about 205 km./hr. This storm is
moving west with a speed of 20 km/hr., expected to move into the South
China Sea by tonight. This storm will
move near Hong Kong, China and move closer to the southern coast of China,
passing through Hainan Island into the Gulf of Tonkin on 25 September
2025. It
is expected to weaken into tropical storm before making landfall over upper
Vietnam. Storm “RAGASA” is forecast to downgrade rapidly due to the extending
of the high pressure system of China during 25 – 26 September.
The
storm “RAGASA” effects to the monsoon through which lie across the North and
the upper Northeast and southwest monsoon which prevail over the Thailand more
strength. Heavy to very heavy rain will occur in the North, the Northeast, the
Central, the East including Bangkok and vicinity during 23-26 September 2025. People in the country
should beware of heavy to very heavy rain and accumulation that may cause flash
floods and overflows especially along the waterways near foothills and
lowlands. The wind force waves in the upper Andaman Sea and the upper Gulf up
to 2-3 meters high and above 3 meters high in thundershowers. All ships in the
Andaman Sea should proceed with caution. Small boats in the upper Andaman Sea
should keep ashore during 24 – 26 September 2025.
This
advisory is in effect on 22 September 2025, at 05.00 p.m.
This
next issue will be on 22 September 2025, at 11.00 p.m.
(Signed) Sugunyanee Yavinchan
(Miss Sugunyanee
Yavinchan)
Director-General
Thai Meteorological Department