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Bulletin updated at 18:45 HKT 19/Oct/2017

Here is the latest weather bulletin issued by the Hong Kong Observatory.

A dry northeast monsoon is affecting the coast of Guangdong.

At 4 p.m., Typhoon Lan was centred about 1100 kilometres south-southeast of Okinawa. It is forecast to move north-northwest at about 16 kilometres per hour across the seas east of the Philippines and intensify progressively.

Weather forecast for tonight and tomorrow

Cloudy periods overnight. Mainly fine and dry during the day tomorrow. Temperatures will range between 23 and 29 degrees. Moderate north to northeasterly winds, fresh at times.

Outlook : Remaining fine and dry in the following few days. Slightly cooler with relatively large temperature difference between day and night early next week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 20/10/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 19/Oct/2017

GALE WARNING AREAS: KWANGTUNG, TAIWAN STRAIT, BASHI AND BALINTANG.

GENERAL SITUATION AT 182100 UTC:
AN INTENSE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. TYPHOON LAN (1721) 965 HPA 15N 131E N OR NNW 10 KT INTSF.

MARINE FORECAST FOR 24 HOURS FROM 190100 UTC:

HONG KONG= N TO NE 5-6. FINE. SEA 2-3 M. SWELL NE 2 M. TEMP 29-23 C. =
KWANGTUNG= N TO NE 6-7, OCNL 8 IN E. ISOL SHOWERS. SEA 3-4 M, UP TO 6 M IN E. SWELL NE 2-3 M. =
TAIWAN STRAIT= N TO NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 3-5 M. =
BASHI= N TO NE 6-7, BEC 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6 M. SWELL NE 3-5 M. =
PRATAS= N TO NE 6-7. ISOL SHOWERS AND TS. SEA 3-4 M. SWELL NE 3 M. =
BALINTANG= N TO NE 6-7, BEC 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M, BEC 6 M. SWELL NE 3-5 M. =
SCARBOROUGH= N TO NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 3 M. =
PARACEL= N TO NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2 M. =
DANANG= N TO NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
NNNN
Abbreviations:
KT, VRB, SLW, FRQ - knot, variable, slow, frequent STNR, QSTNR, C - stationary, quasi-stationary, degrees celsius WKN, INTSF, INTST, NC - weaken, intensify, intensity, no change LGT, ISOL, SCT, OCNL - light, isolated, scattered, occasional CLD, DZ, TS - cloudy, drizzle, thunderstorm

The date and time are specified by a 6-digit number DDHHMM. DD stands for the day of month, HH represents the hour while MM indicates the minute in UTC.


  • Map showing the 10 forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 19/OCT/2017
    (Next update at 01:30 HKT 20/OCT/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE COAST OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10
       OFFSHORE:  030/15-20                            27-23
   B.   2000 FT:  020/15-20                            20
   C.   5000 FT:  040/10                               16
   D.  10000 FT:  010/10                               12
   E.  18000 FT:  120/10                               0
   F.  24000 FT:  100/10                               MS14
   G.  30000 FT:  130/20                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT.
   K. VISIBILITY    : 10 KM
   L. 0 DEG. C LEVEL: 18000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD OFFSHORE AND  NEAR HILLS
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS.
     MAINLY FINE.=

    ===================================================================
Note: The forecast could be updated before the next issue time 
whenever there is newly expected occurrence or non-occurrence 
of significant weather as described below which may be hazardous 
to aircraft within 100-km radius of Hong Kong:

(a) Change of the tropical cyclone category
(b) Strong, Gale, Storm, and Hurricane force winds
(c) Thunderstorm/CBs
(d) Severe gusts
(e) Severe turbulence
(f) Significant low stratus
(g) Fog or thick haze/sandstorm/duststorm 
    causing significant reduction of visibility
(h) Volcanic ash
(i) Radioactive cloud
===================================================================
    Aviation Weather Observation and Forecast Information for Hong Kong International Airport
    To know more about clouds, please see Commonly observed clouds in Hong Kong.

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    Significant Weather Information (SIGMET)

    The Airport Meteorological Office is responsible for monitoring hazardous weather and phenomena in the atmosphere that may affect the safety of aircraft operations within a designated airspace over the northern part of the South China Sea. Weather forecasters at the Airport Meteorological Office issues SIGMET information when hazardous weather and phenomena in the atmosphere such as thunderstorms, tropical cyclones, turbulence, icing occur or are expected to occur in the airspace.

    The latest significant weather information
    issued by the Hong Kong Observatory at 02:56 HKT on 16 Oct 17

    VHHK SIGMET 10 VALID 151500/151900 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR NC= VHHK SIGMET 11 VALID 151900/152300 VHHH- VHHK HONG KONG FIR SEV TURB FCST W OF E115 FL340/400 STNR NC=

    Please click here for more about the SIGMET

    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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    YESTERDAY'S WEATHER AND RADIATION LEVEL Skip to main content
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    Yesterday's Weather and Radiation Level

    Bulletin issued at 00:15 HKT 19/Oct/2017 
    HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     29.5 C
Minimum Air Temperature                     24.0 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        60 - 83 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2540.9 mm
Against an average of                     2309.7 mm

Other Stations                Min                  Max
King's Park                  23.9 C               29.6 C
Wong Chuk Hang               24.7 C               30.3 C
Ta Kwu Ling                  22.2 C               29.2 C
Lau Fau Shan                 22.1 C               29.1 C
Tai Po                       23.1 C               28.2 C
Sha Tin                      23.6 C               29.5 C
Tuen Mun                     23.2 C               30.1 C
Tseung Kwan O                22.3 C               30.5 C
Sai Kung                     23.4 C               28.0 C
Cheung Chau                  22.9 C               30.2 C
Chek Lap Kok                 24.3 C               30.6 C
Tsing Yi                     24.4 C               30.2 C
Shek Kong                    23.1 C               29.8 C
Tsuen Wan Ho Koon            22.7 C               28.8 C
Tsuen Wan Shing Mun Valley   23.2 C               30.2 C
Hong Kong Park               24.5 C               30.4 C
Shau Kei Wan                 23.0 C               30.5 C
Kowloon City                 23.3 C               30.1 C
Happy Valley                 24.8 C               31.4 C
Wong Tai Sin                 23.3 C               30.7 C
Stanley                      23.8 C               30.6 C
Kwun Tong                    22.8 C               29.4 C
Sham Shui Po                 23.7 C               31.0 C
Kai Tak Runway Park          24.3 C               30.0 C
Yuen Long Park               23.8 C               31.0 C
Tai Mei Tuk               22.9 C               29.1 C

Duration of sunshine (King's Park):              9.6 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 8.
Sea surface temperature (Waglan Island):        27.6 C 

Yesterday's (18 Oct 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 microsievert per hour.  These are within the normal
range of fluctuation of the background radiation level in
Hong Kong (see Note). The average dose rates measured at the
radiation monitoring stations over various parts of the
territory were as follows :

Station                     Yesterday's average
                            (microsievert/hour)
Ping Chau                           0.08
Tap Mun                             0.09
Kat O                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.13

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 18 Oct
     2003copy right image | Important notices | Privacy policy Last revision date: <19 Oct 2017> 

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