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Bulletin issued at 13:30 HKT 23/Jul/2017

At 1 p.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 94 per cent.
During the past hour the mean UV Index recorded at King's Park was 2. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 25 degrees;
Tai Po 26 degrees;
Sha Tin 28 degrees;
Tuen Mun 26 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 27 degrees;
Tsing Yi 27 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 27 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

Between 11:45 a.m. and 12:45 p.m., the rainfall recorded in various regions were:

North District 1 to 13 mm;
Tai Po 0 to 6 mm;
Yuen Long 1 to 6 mm;
Sha Tin 0 to 5 mm;
Tuen Mun 1 to 5 mm;
Islands District 0 to 4 mm;
Sai Kung 0 to 3 mm;
Tsuen Wan 0 to 2 mm;
Kowloon City 0 to 1 mm;
Kwai Tsing 0 to 1 mm;
Sham Shui Po 0 to 1 mm;
Wong Tai Sin 0 to 1 mm.

Here is the information on Tropical Storm Roke:
Location: 22.6 degrees north, 113.7 degrees east; Maximum sustained wind near its centre: 65 km/h.

Here is the information on Tropical Depression at noon:
Location: 17.9 degrees north, 111.1 degrees east.


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


Climatological Information for 23 Jul

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 13:25 HKT 23/Jul/2017

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

Weather forecast for this afternoon and tonight

Fresh to strong southerly winds at first, becoming east to southeasterly winds tonight. Winds will moderate gradually. There will be rough seas and swells. Cloudy to overcast with occasional squally showers and thunderstorms.

Outlook : Showers will ease off tomorrow. Becoming fine and very hot in the following couple of days.


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

GALE WARNING AREA: HONG KONG.

GENERAL SITUATION AT 222100 UTC:
FOR DETAILS ON TROPICAL STORM ROKE (1707) AND TROPICAL DEPRESSION OVER SEAS EAST OF HAINAN ISLAND, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 230100 UTC:

HONG KONG= CYCLONIC 7-8, BEC S TO SE UP TO 7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL E TO SE 2-3 M. TEMP 30-27 C. =
KWANGTUNG= E TO SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
TAIWAN STRAIT= SE 5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. =
BASHI= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO SE 2-3 M. =
PRATAS= E TO SE 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
BALINTANG= E TO SE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO SE 2-3 M. =
SCARBOROUGH= S TO SE 5-6. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
PARACEL= CYCLONIC 6-7, SE 6-7 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO SE 2-3 M. =
TONKIN= NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S 2 M. =
DANANG= NW 5-6, CYCLONIC UP TO 7 LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO SE 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

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 12:30 HKT 23/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 23 July 2017

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

    Weather Situation:
    At noon, Tropical Storm Roke with maximum sustained winds of about 65 kilometres per hour near its centre was located at 22.6 degrees north, 114.0 degrees east. It is forecast to move west or west-northwest at about 20 kilometres per hour across inland Guangdong and weaken gradually. Meanwhile, the tropical depression over the seas east of Hainan Island with maximum sustained winds of about 45 kilometres per hour near its centre was located near 17.9 degrees north, 111.1 degrees east. It is forecast to move west-northwest slowly towards Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Cyclonic force 7 to 8, becoming east to southeast up to force 7 later.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    East to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    North force 7 to 8, becoming south force 8.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Shangchuan Dao:
    Southeast force 5 to 6.
    Frequent heavy squally showers and thunderstorms.
    Rough seas.

    Outlook for the next 48 hours
    East to southeasterly winds of force 5 to 6, occasionally force 7. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind south force 4
      Visibility 18 Kilometres

    Shantou Wind east force 2
      Visibility 2100 Metres in showers

    Dongsha Wind south force 2
      Visibility 9 Kilometres

    Huangmaozhou Wind north force 2

    Macau Wind northeast force 3
      Visibility 9 Kilometres in drizzle

    Xisha Wind southwest force 5
      Visibility 10 Kilometres

  • Explanation of Seas or Sea Waves
  • Explanation of Swells
  • Descriptive Terms of Wind Speeds
  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 23/JUL/2017
    (Next update at 17:30 HKT 23/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     GALE FORCE WINDS.
     SEV TURB AND SEV GUSTS.
     CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 9 A.M., TROPICAL STORM ROKE WAS CENTRED NEAR
     22.3 DEGREES NORTH 114.7 DEGREES EAST AND IS
     FORECAST TO MOVE WEST OR WEST-NORTHWEST AT ABOUT
     11 KNOTS ACROSS THE PEARL RIVER ESTUARY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  CYCLONIC/25-30 BEC 150/15-20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  CYCLONIC/35 BEC 150/20-25            26-30
   B.   2000 FT:  CYCLONIC/30-35 BEC 130/20-25         23
   C.   5000 FT:  070/35 BEC 140/25                    19
   D.  10000 FT:  070/25 BEC 140/20                    12
   E.  18000 FT:  080/20 BEC 140/20                    MS2
   F.  24000 FT:  090/20                               MS12
   G.  30000 FT:  090/20                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL SQUALLY SHOWERS
      AND THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT  BKN 6000 FT.  TEMPO
      FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS.
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 4.0-6.0 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EAST TO SOUTHEASTERLY WINDS.  MAINLY
     CLOUDY WITH A FEW SQUALLY SHOWERS AND
     THUNDERSTORMS.=

    ===================================================================
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 12:45 HKT on 23 Jul 17

    VHHK SIGMET 4 VALID 230445/230830 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2248 E11442 - N2342 E11730 - N2148 E11730 - N2054 E11254 - N2154 E11242 - N2248 E11442 TOP FL420 MOV NW 10 KT NC=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 13:25 HKT 23/Jul/2017

    Tropical Cyclone Warning Bulletin

    Here is the latest Tropical Cyclone Warning Bulletin issued by the Hong Kong Observatory.

    The Strong Wind Signal, No. 3 was issued at 1:20 p.m.

    This means that winds with mean speeds of 41 to 62 kilometres per hour are expected.

    At 1 p.m., Tropical Storm Roke was estimated to be about 60 kilometres northwest of Hong Kong Observatory (near 22.6 degrees north 113.7 degrees east) and is forecast to move west or west-northwest at about 20 kilometres per hour across inland Guangdong and weaken gradually.

    Roke is departing Hong Kong and is weakening quickly. When the threat of Roke to Hong Kong further decreases, the Observatory will cancel all the Tropical Cyclone Warning Signals.

    Under the influence of the circulation of Roke, there will still be squally showers in the vicinity of the Pearl River Estuary. Seas are rough and there are swells. You are advised to stay away from the shoreline and not to engage in water sports.

    (Precautionary Announcements with No. 3 Signal)

    1. It is not yet safe for small craft and fishing vessels to leave typhoon shelters.

    2. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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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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    Severe Weather Information Centre

    Bulletin issued at 12:31 HKT 23/Jul/2017


    Tropical Cyclone Warning

    At 230300 UTC, Tropical Depression over the seas east of Hainan with central pressure 1000 hectopascals was centred within 60 nautical miles of one seven point nine degrees north (17.9 N) one one one point one degrees east (111.1 E) and is forecast to move west-northwest slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 25 knots.

    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 240300 UTC
    One eight point two degrees north (18.2 N)
    One one zero point three degrees east (110.3 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 250300 UTC
    One eight point six degrees north (18.6 N)
    One zero eight point four degrees east (108.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 260300 UTC
    One nine point four degrees north (19.4 N)
    One zero five point three degrees east (105.3 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 270300 UTC
    Dissipated over land.

    Bulletin issued at 12:30 HKT 23/Jul/2017


    Tropical Cyclone Warning

    At 230300 UTC, Tropical Storm Roke (1707) with central pressure 996 hectopascals was centred within 30 nautical miles of two two point six degrees north (22.6 N) one one four point two degrees east (114.2 E) and is forecast to move west or west-northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 60 nautical miles.

    Forecast position and intensity at 240300 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 23/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.1 C
Minimum Air Temperature                     26.5 C
Grass Minimum Temperature                   26.9 C
Relative Humidity                        62 - 95 Percent
Rainfall                                     3.3 mm 
Total rainfall since 1st January          1710.0 mm
Against an average of                     1378.5 mm

Other Stations                Min                  Max
King's Park                  26.2 C               32.6 C
Wong Chuk Hang               26.7 C               32.8 C
Ta Kwu Ling                  26.3 C               33.8 C
Lau Fau Shan                 26.3 C               33.5 C
Tai Po                       25.6 C               31.9 C
Sha Tin                      26.1 C               33.7 C
Tuen Mun                     26.4 C               33.1 C
Tseung Kwan O                25.7 C               32.5 C
Sai Kung                     25.8 C               32.0 C
Cheung Chau                  25.0 C               30.3 C
Chek Lap Kok                 26.8 C               34.6 C
Tsing Yi                     26.2 C               33.5 C
Shek Kong                    26.6 C               34.1 C
Tsuen Wan Ho Koon            25.5 C               32.1 C
Tsuen Wan Shing Mun Valley   26.1 C               32.6 C
Hong Kong Park               25.8 C               32.1 C
Shau Kei Wan                 25.7 C               31.2 C
Kowloon City                 26.7 C               33.2 C
Happy Valley                 26.5 C               34.2 C
Wong Tai Sin                 27.1 C               32.9 C
Stanley                      25.8 C               32.1 C
Kwun Tong                    26.4 C               31.8 C
Sham Shui Po                 26.6 C               34.1 C
Kai Tak Runway Park          26.6 C               31.9 C
Yuen Long Park               26.8 C               33.8 C
Tai Mei Tuk               26.0 C               32.6 C

Duration of sunshine (King's Park):              8.4 H
The mean UV index recorded at King's Park yesterday was 6,
the UV intensity was High.
The maximum UV index for yesterday was 13.
 

Yesterday's (22 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                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
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                      0.12
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 22 Jul
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