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Bulletin issued at 04:02 HKT 13/Nov/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 22 degrees Celsius and the relative humidity 89 per cent.

The air temperatures at other places were:

King's Park 21 degrees;
Wong Chuk Hang 22 degrees;
Ta Kwu Ling 22 degrees;
Lau Fau Shan 21 degrees;
Tai Po 21 degrees;
Sha Tin 22 degrees;
Tuen Mun 22 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 22 degrees;
Cheung Chau 21 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 22 degrees;
Shek Kong 23 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 22 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 21 degrees;
Kowloon City 21 degrees;
Happy Valley 22 degrees;
Wong Tai Sin 21 degrees;
Stanley 22 degrees;
Kwun Tong 21 degrees;
Sham Shui Po 22 degrees;
Kai Tak Runway Park 22 degrees;
Tai Mei Tuk 21 degrees.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 13 Nov

Regional Weather in Hong Kong

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Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 03:45 HKT 13/Nov/2017

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

The northeast monsoon is affecting the coast of southeastern China. Meanwhile, a broad band of clouds is covering the region.

Weather forecast for today

Cloudy with a few rain patches. Temperatures will range between 21 and 25 degrees. Moderate to fresh east to northeasterly winds, occasionally strong offshore and on high ground at first.

Outlook : Mainly cloudy in the following couple of days. Brighter in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT today, 13/11/2017; 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 21:00 HKT 12/Nov/2017

GALE WARNING AREAS: HONG KONG, KWANGTUNG, TAIWAN STRAIT, BASHI, BALINTANG, PARACEL AND DANANG.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION HAIKUI (1724), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= E TO NE 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2 M. TEMP 21-25 C. =
KWANGTUNG= E TO NE 6-7, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 2-3 M, SE 2-3 M. =
TAIWAN STRAIT= NE 7-8. RAIN PATCHES. SEA 4-6 M. SWELL NE 2-3 M. =
BASHI= NE 7-8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
PRATAS= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
BALINTANG= NE 6-7, OCNL 8. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3-4 M. =
SCARBOROUGH= E TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 3-4 M. =
PARACEL= CYCLONIC 7-8, N TO NE 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS AT FIRST. SEA 3-6 M. SWELL NE 3-4 M, SE 3 M. =
TONKIN= N TO NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
DANANG= NE 6-7, OCNL 8. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 6 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 03:30 HKT 13/Nov/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 13 November 2017

    Warnings:
    Gale force winds in Hong Kong adjacent waters, south of Hong Kong and Shangchuan Dao. Strong winds in Nan'ao and Shanwei.

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 6 to 7, occasionally force 8.
    Isolated squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    East to northeast force 6 to 7.
    Scattered squally showers and thunderstorms.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    East to northeast force 6 to 7, occasionally force 8.
    Scattered squally showers and thunderstorms.
    Rough to very rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 6. Isolated squally showers and thunderstorms.

    Latest reports from south China coastal weather stations
    --------------------------------------------------------

    Waglan Island Wind east-northeast force 6
      Visibility 11 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 2900 Metres in mist

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east force 7

    Macau Wind east-northeast force 2
      Visibility 4300 Metres in mist

    Xisha Wind south force 2
      Visibility 10 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 13/NOV/2017
    (Next update at 9:00-9:30 HKT 13/NOV/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH CHINA COASTAL
     AREAS. BESIDES, TROPICAL DEPRESSION HAIKUI HAS WEAKENED
     INTO AN AREA OF LOW PRESSURE OVER THE CENTRAL PART OF THE 
     SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  080/10-15, OCNL 20
       OFFSHORE:  080/20-25, OCNL 30                   21-25
   B.   2000 FT:  080/20-25                            18
   C.   5000 FT:  100/15                               16
   D.  10000 FT:  220/10                               9
   E.  18000 FT:  260/15                               MS3
   F.  24000 FT:  260/30                               MS15
   G.  30000 FT:  260/40                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2000-3300 FT.
   I. WEATHER       : 
      CLOUDY WITH A FEW RAIN PATCHES.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT  BKN 8000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN RAIN.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 9400 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS, OCCASIONALLY STRONG
     OFFSHORE. CLOUDY WITH A FEW RAIN PATCHES.=

    ===================================================================
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.

    sigmet
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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 21:00 HKT on 12 Nov 17

    VHHK SIGMET 3 VALID 120900/121300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1642 E11400 - N1906 E11154 - N1942 E11318 - N2230 E11730 - N2100 E11730 TOP FL420 MOV W 05KT WKN= VHHK SIGMET 4 VALID 121300/121700 VHHH- VHHK HONG KONG FIR EMBD TS FCST S OF N2030 AND E OF E11530 TOP FL400 STNR WKN=

    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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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 21:30 HKT 12/Nov/2017


    Tropical Cyclone Warning

    At 121200 UTC, Tropical Depression Haikui (1724) has weakened into an area of low pressure.

    No further warnings on this area of low pressure will be issued by the Hong Kong Observatory unless regeneration takes place.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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 13/Nov/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     23.5 C
Minimum Air Temperature                     21.1 C
Grass Minimum Temperature                   21.8 C
Relative Humidity                        76 - 96 Percent
Rainfall                                    14.7 mm 
Total rainfall since 1st January          2556.2 mm
Against an average of                     2351.8 mm

Other Stations                Min                  Max
King's Park                  20.6 C               23.2 C
Wong Chuk Hang               21.1 C               23.7 C
Ta Kwu Ling                  21.4 C               24.6 C
Lau Fau Shan                 21.1 C               25.4 C
Tai Po                       20.9 C               23.6 C
Sha Tin                      21.5 C               24.4 C
Tuen Mun                     21.6 C               24.5 C
Tseung Kwan O                20.6 C               23.3 C
Sai Kung                     21.0 C               23.7 C
Cheung Chau                  20.2 C               22.9 C
Chek Lap Kok                 21.7 C               25.4 C
Tsing Yi                     21.4 C               24.5 C
Shek Kong                    21.8 C               24.6 C
Tsuen Wan Ho Koon            20.1 C               23.1 C
Tsuen Wan Shing Mun Valley   21.1 C               23.9 C
Hong Kong Park               20.6 C               23.5 C
Shau Kei Wan                 19.9 C               23.0 C
Kowloon City                 20.6 C               23.4 C
Happy Valley                 20.9 C               23.8 C
Wong Tai Sin                 20.9 C               23.4 C
Stanley                      20.0 C               23.2 C
Kwun Tong                    20.5 C               22.9 C
Sham Shui Po                 21.3 C               24.5 C
Kai Tak Runway Park          20.9 C               23.6 C
Tai Mei Tuk               21.0 C               23.9 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 0.9,
the UV intensity was Low.
The maximum UV index for yesterday was 2.
Sea surface temperature (Waglan Island):        24.2 C 

Yesterday's (12 Nov 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                               0.10
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                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 12 Nov
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