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Bulletin issued at 00:02 HKT 22/Aug/2017

At midnight at the Hong Kong Observatory the air temperature was 31 degrees Celsius and the relative humidity 81 per cent.

Please be reminded that:

The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 30 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 30 degrees;
Tai Po 30 degrees;
Sha Tin 30 degrees;
Tuen Mun 31 degrees;
Tseung Kwan O 29 degrees;
Sai Kung 29 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 32 degrees;
Tsing Yi 29 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 31 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 30 degrees;
Stanley 30 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 29 degrees.

Here is the information on Tropical Storm Hato at 11:00 p.m. yesterday:
Location: 20.3 degrees north, 122.4 degrees east.


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


Climatological Information for 22 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:00 HKT 22/Aug/2017

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

The weather was generally fine over southern China yesterday. Locally, it was mainly fine and very hot. Temperatures in many places rose to 35 degrees or above in the afternoon. Besides, Hato intensified from a tropical depression into a tropical storm yesterday. Hato is expected to enter the northern part of the South China Sea today and move in the general direction of the coast of eastern Guangdong, bringing unsettled weather to Guangdong on Wednesday.

At 11 p.m. last night, Hato was centred about 340 kilometres southeast of Gaoxiong. It is forecast to move west-northwest at about 22 kilometres per hour towards Luzon Strait.

Weather forecast for Hong Kong (Tuesday, 22 Aug 2017)

Mainly fine and hazy at first. Very hot with temperatures ranging between 28 and 34 degrees. Becoming cloudy with a few showers and squally thunderstorms later. Light to moderate west to northwesterly winds.

Outlook : Cloudy to overcast with squally showers on Wednesday. Still showery in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 22/08/2017; 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 21/Aug/2017

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

GENERAL SITUATION AT 210900 UTC:
FOR DETAILS ON TROPICAL STORM HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 211300 UTC:

HONG KONG= W TO NW 4-5. DOWN TO 4000 M IN SOME HAZE AT FIRST. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M. TEMP 28-34 C. =
KWANGTUNG= NW 4-5, UP TO 9 IN E LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS IN E. SEA 2 M, UP TO 8 M IN E LATER. SWELL NE 2-3 M. =
TAIWAN STRAIT= N 5-6, UP TO 9 IN S LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 8 M IN S LATER. SWELL NE 2-3 M. =
BASHI= CYCLONIC 7-8, UP TO 10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 10 M LATER. SWELL NE 2-3 M. =
PRATAS= W TO NW 4-5, UP TO 8 LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2 M, UP TO 6 M LATER. SWELL NE 2-3 M. =
BALINTANG= W TO NW 7-8, SW UP TO 10 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 10 M LATER. SWELL NE 2-3 M. =
SCARBOROUGH= W TO SW 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PARACEL= NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 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 23:30 HKT 21/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 21 August 2017

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

    Weather Situation:
    At 11 p.m., Tropical Storm Hato with maximum sustained winds of about 75 kilometres per hour near its centre was located near 20.3 degrees north, 122.4 degrees east. It is forecast to move west-northwest at about 22 kilometres per hour towards Luzon Strait.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    West to northwest force 4 to 5.
    Some haze at first. Isolated squally showers and thunderstorms later.
    Moderate seas.

    Nan'ao:
    North to northwest force 5 to 6, becoming cyclonic up to force 10 later.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming very rough to high later.

    Shanwei:
    North to northwest force 4 to 5, becoming force 6 to 7.
    Scattered squally showers and thunderstorms.
    Moderate seas, becoming rough.

    South of Hong Kong and Shangchuan Dao:
    Northwest force 4 to 5, becoming force 6 later.
    Isolated squally showers and thunderstorms later.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    West to northwesterly winds of force 7 to 8, cyclonic winds of force 9 to 10 in east. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 2
      Visibility 7 Kilometres

    Shantou Wind east-northeast force 1
      Visibility 23 Kilometres

    Dongsha Wind north-northwest force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind west force 4

    Macau Wind south-southwest force 2
      Visibility 16 Kilometres

    Xisha Wind north-northeast force 2
      Visibility 30 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 21/AUG/2017
    (Next update at 01:30 HKT 22/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE WEATHER IS GENERALLY FINE OVER SOUTHERN
     CHINA.
     AT 4 P.M., TROPICAL STORM HATO WAS CENTRED NEAR
     20.4 DEGREES NORTH, 124.0 DEGREES EAST.  IT IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 10
     KNOTS TOWARDS LUZON STRAIT AND INTENSIFY
     GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  300/5-10
       OFFSHORE:  300/10-15                            32-28
   B.   2000 FT:  320/10-15                            27
   C.   5000 FT:  250/10                               21
   D.  10000 FT:  360/15                               13
   E.  18000 FT:  020/15                               MS3
   F.  24000 FT:  040/20                               MS12
   G.  30000 FT:  040/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE APART FROM A FEW SHOWERS.
      LOCALIZED HAZE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS/HAZE.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : NIL
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE WEST TO NORTHWESTERLY WINDS.  MAINLY
     FINE APART FROM A FEW SHOWERS.  LOCALIZED HAZE.=

    ===================================================================
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 00:40 HKT on 22 Aug 17

    VHHK SIGMET 1 VALID 211640/212040 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1736 E11442 - N1800 E11412 - N1924 E11412 - N2054 E11530 - N2100 E11730 TOP FL450 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.

    The latest report on Tropical Cyclone Roke broadcast by Miss LEE SHUK MING , Senior Scientific Officer of the Hong Kong Observatory at 6:23 p.m. on 23 Jul 2017.
    Listen Listen

    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

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    Bulletin issued at 00:30 HKT 22/Aug/2017


    Tropical Cyclone Warning

    At 211500 UTC, Tropical Storm Hato (1713) with central pressure 990 hectopascals was centred within 90 nautical miles of two zero point three degrees north (20.3 N) one two two point four degrees east (122.4 E) and is forecast to move west-northwest at about 12 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 45 nautical miles.
    Radius of over 2 metre waves 150 nautical miles.

    Forecast position and intensity at 221500 UTC
    Two two point four degrees north (22.4 N)
    One one seven point four degrees east (117.4 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 231500 UTC
    Two four point one degrees north (24.1 N)
    One one zero point eight degrees east (110.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 241500 UTC
    Dissipated over land.



    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 22/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.5 C
Minimum Air Temperature                     28.6 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        54 - 86 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1905.3 mm
Against an average of                     1775.5 mm

Other Stations                Min                  Max
King's Park                  28.1 C               34.8 C
Wong Chuk Hang               27.6 C               35.2 C
Ta Kwu Ling                  25.3 C               37.7 C
Lau Fau Shan                 27.9 C               36.2 C
Tai Po                       27.0 C               35.5 C
Sha Tin                      27.5 C               37.3 C
Tuen Mun                     27.8 C               35.8 C
Tseung Kwan O                27.4 C               36.4 C
Sai Kung                     27.7 C               35.5 C
Cheung Chau                  27.2 C               36.4 C
Chek Lap Kok                 28.4 C               37.5 C
Tsing Yi                     26.8 C               35.7 C
Shek Kong                    27.0 C               37.5 C
Tsuen Wan Ho Koon            26.2 C               35.1 C
Tsuen Wan Shing Mun Valley   26.7 C               36.7 C
Hong Kong Park               27.7 C               35.5 C
Shau Kei Wan                 27.9 C               36.8 C
Kowloon City                 27.8 C               37.3 C
Happy Valley                 28.5 C               37.3 C
Wong Tai Sin                 27.2 C               37.3 C
Stanley                      28.2 C               35.4 C
Kwun Tong                    28.5 C               36.2 C
Sham Shui Po                 27.6 C               37.1 C
Kai Tak Runway Park          28.2 C               35.2 C
Yuen Long Park               27.8 C               37.4 C
Tai Mei Tuk               27.3 C               35.5 C

Duration of sunshine (King's Park):              10.1 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        25.4 C 

Yesterday's (21 Aug 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                               0.08
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.10
Sai Wan Ho                          0.08
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

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 21 Aug
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