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Bulletin issued at 16:02 HKT 04/Jul/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 97 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.6. The intensity of UV radiation was low.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 4:45 p.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 25 degrees;
Tai Po 25 degrees;
Sha Tin 27 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 26 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 26 degrees;
Shek Kong 26 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 26 degrees;
Stanley 25 degrees;
Kwun Tong 26 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 26 degrees.

Between 2:45 and 3:45 p.m., lightning was detected within New Territories East, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Sai Kung 0 to 16 mm;
Sha Tin 2 to 13 mm;
North District 2 to 12 mm;
Tai Po 0 to 11 mm;
Islands District 0 to 10 mm;
Tsuen Wan 2 to 7 mm;
Yuen Long 1 to 7 mm;
Southern District 0 to 7 mm;
Kwai Tsing 2 to 6 mm;
Kwun Tong 1 to 6 mm;
Wong Tai Sin 1 to 6 mm;
Kowloon City 2 to 3 mm;
Yau Tsim Mong 1 to 2 mm;
Central & Western District 0 to 2 mm;
Sham Shui Po 2 mm;
Tuen Mun 0 to 2 mm;
Wan Chai 0 to 1 mm;
Eastern District 0 to 1 mm.


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


Climatological Information for 4 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 16:15 HKT 04/Jul/2017

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

Showers associated with an active southerly airstream are affecting the coast of Guangdong. Locally, more than 10 millimetres of rainfall were recorded over many places in the afternoon. Around 70 millimetres of rainfall were even recorded at Cheung Chau.

At 4 p.m., Severe Tropical Storm Nanmadol was centred about 120 kilometres south-southeast of Osaka. It is forecast to move east-northeast at about 60 kilometres per hour across the southern part of Japan and weaken gradually.

Weather forecast for tonight and tomorrow

Mainly cloudy with occasional showers and isolated thunderstorms. Sunny intervals tomorrow with temperatures ranging between 26 and 30 degrees. Moderate southeasterly winds.

Outlook : Still some showers and isolated thunderstorms in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 05/07/2017; 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 04/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 032100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 040100 UTC:

HONG KONG= S 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. TEMP 30-27 C. =
KWANGTUNG= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
BASHI= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW UP TO 2 M. =
PRATAS= S TO SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
BALINTANG= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL S TO SW UP TO 2 M. =
SCARBOROUGH= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
PARACEL= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS IN W. SEA UP TO 3 M. SWELL S UP TO 2 M. =
TONKIN= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. =
DANANG= S TO SE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 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 16:30 HKT 04/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 04 July 2017

    Weather Situation:
    A southerly airstream is bringing unsettled weather to the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Southeast force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Nan'ao and Shanwei:
    Southeast force 4 to 5.
    Isolated showers and thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    Southeast force 4 to 5.
    Scattered squally showers and thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5. Isolated showers and thunderstorms.

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

    Waglan Island Wind southeast force 2
      Visibility 15 Kilometres

    Shantou Wind south force 3
      Visibility 30 Kilometres

    Dongsha Wind south-southeast force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 3

    Macau Wind west-northwest force 2
      Visibility 15 Kilometres

    Xisha Wind south-southwest force 2
      Visibility 29 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 09:00 HKT 04/JUL/2017
    (Next update at 17:30 HKT 04/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM CONTINUES TO BRING SHOWERS
     AND THUNDERSTORMS TO THE COASTAL AREAS OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  160/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  160/15                               27-31
   B.   2000 FT:  180/15-20                            24
   C.   5000 FT:  180/20                               19
   D.  10000 FT:  190/20                               10
   E.  18000 FT:  190/20                               MS3
   F.  24000 FT:  190/20                               MS13
   G.  30000 FT:  190/15                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS AND A FEW SQUALLY
      THUNDERSTORMS.  SUNNY INTERVALS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 3000 FT  BKN 10000 FT.  TEMPO
      FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS.
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.5-2.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTH TO SOUTHEASTERLY WINDS.  SUNNY
     INTERVALS AND A FEW SHOWERS.=

    ===================================================================
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 13:30 HKT on 04 Jul 17

    VHHK SIGMET 1 VALID 040130/040530 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11130 - N2124 E11130 - N2230 E11342 - N2312 E11606 - N2200 E11548 - N2042 E11130 TOP FL400 MOV NNE 10KT NC= VHHK SIGMET 2 VALID 040530/040930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2042 E11130 - N2124 E11130 - N2230 E11342 - N2306 E11542 - N2200 E11536 - N2042 E11130 TOP FL400 MOV NNE 10KT 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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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Bulletin issued at 18:30 HKT 03/Jul/2017


    Tropical Cyclone Warning

    At 030900 UTC, Severe Tropical Storm Nanmadol (1703) with central pressure 980 hectopascals was centred within 60 nautical miles of two eight point six degrees north (28.6 N) one two five point five degrees east (125.5 E) and is forecast to move northeast or north-northeast at about 24 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 55 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 47 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles over eastern semicircle, 120 nautical miles elsewhere.

    No further warnings on this Severe Tropical Storm will be issued by the Hong Kong Observatory unless it re-enters the Hong Kong area of responsibility.

    Forecast position and intensity at 040900 UTC
    Three four point zero degrees north (34.0 N)
    One three five point three degrees east (135.3 E)
    Maximum winds 40 knots.

    Forecast position and intensity at 050900 UTC
    Become extratropical low.



    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 04/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.7 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   27.0 C
Relative Humidity                        77 - 93 Percent
Rainfall                                     8.4 mm 
Total rainfall since 1st January          1214.4 mm
Against an average of                     1130.8 mm

Other Stations                Min                  Max
King's Park                  26.6 C               31.1 C
Ta Kwu Ling                  25.5 C               29.0 C
Lau Fau Shan                 24.7 C               28.0 C
Tai Po                       24.9 C               28.0 C
Sha Tin                      25.5 C               30.1 C
Tuen Mun                     25.5 C               29.1 C
Tseung Kwan O                25.8 C               30.9 C
Sai Kung                     26.7 C               31.0 C
Cheung Chau                  24.6 C               29.0 C
Chek Lap Kok                 26.2 C               30.5 C
Tsing Yi                     26.1 C               30.7 C
Shek Kong                    25.5 C               29.5 C
Tsuen Wan Ho Koon            25.1 C               28.5 C
Tsuen Wan Shing Mun Valley   25.8 C               30.1 C
Hong Kong Park               26.4 C               30.5 C
Shau Kei Wan                 26.5 C               31.6 C
Kowloon City                 25.4 C               30.6 C
Happy Valley                 27.3 C               31.1 C
Wong Tai Sin                 26.1 C               30.7 C
Stanley                      27.5 C               31.1 C
Kwun Tong                    27.1 C               30.8 C
Sham Shui Po                 25.2 C               30.8 C
Kai Tak Runway Park          27.4 C               30.7 C
Yuen Long Park               24.9 C               29.1 C
Tai Mei Tuk               25.0 C               28.2 C

Duration of sunshine (King's Park):              1.3 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 7.
 

Yesterday's (03 Jul 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                             0.08
Kat O                               0.09
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
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 03 Jul
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