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Bulletin issued at 04:02 HKT 23/Jul/2017

At 4 a.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 74 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 3 has been issued.

The air temperatures at other places were:

King's Park 28 degrees;
Wong Chuk Hang 28 degrees;
Ta Kwu Ling 26 degrees;
Lau Fau Shan 27 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 26 degrees;
Sai Kung 28 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 29 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 28 degrees;
Stanley 28 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Tropical Storm Roke:
Location: 21.9 degrees north, 115.8 degrees east; Maximum sustained wind near its centre: 65 km/h.

Here is the information on Tropical Depression at 3 a.m.:
Location: 17.9 degrees north, 111.3 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

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 04:10 HKT 23/Jul/2017

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

Weather forecast for today

Fresh northerly winds, strengthening gradually with gale force offshore occasionally. Becoming south to southeasterly winds later. There will be rough seas and swells. Mainly cloudy. Occasional squally showers and thunderstorms. Temperatures will range between 26 and 30 degrees.

Outlook : Showers will ease off on Monday. Becoming fine and very hot in the following few 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 21:00 HKT 22/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 220900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION ROKE (1707) AND TROPICAL DEPRESSION EAST OF HAINAN ISLAND, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 221300 UTC:

HONG KONG= E 5-6, CYCLONIC UP TO 7 LATER. DOWN TO 1000 M IN SQUALLY SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. SWELL E TO SE 2 M. TEMP 26-30 C. =
KWANGTUNG= SE 5-6, CYCLONIC UP TO 7 IN E. 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, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO SE 2-3 M. =
PRATAS= CYCLONIC 6-7, BEC 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 E TO SE 2-3 M. =
PARACEL= CYCLONIC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2-3 M. =
TONKIN= NE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 2 M. =
DANANG= NW 4-5, OCNL 6. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
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    Bulletin issued at 03:30 HKT 23/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 23 July 2017

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

    Weather Situation:
    Tropical Depression Roke has intensified into a tropical storm. At 3 a.m., Roke with maximum sustained winds of about 65 kilometres per hour near its centre was located near 21.7 degrees north, 116.0 degrees east. It is forecast to move west-northwest at about at about 20 kilometres per hour edging closer to the vicinity of the Pearl River Delta. 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, 111.3 degrees east. It is forecast to move northwest slowly towards Hainan Island.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7, becoming cyclonic force 8 later.
    Heavy squally showers and thunderstorms.
    Rough to very rough seas.

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

    Shanwei:
    Cyclonic force 8, becoming east to southeast force 6 to 7.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas.

    South of Hong Kong:
    Northeast force 6 to 7, becoming south force 7 later.
    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 north-northeast force 3
      Visibility 23 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 25 Kilometres

    Dongsha Wind south-southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind north force 2

    Macau Wind north-northeast force 1
      Visibility 19 Kilometres

    Xisha Wind southwest force 5
      Visibility 14 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
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 02:45 HKT 23/JUL/2017
    (Next update at 9:00-9:30 HKT 23/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     TROPICAL DEPRESSION ROKE HAS INTENSIFIED INTO A
     TROPICAL STORM. AT 2 A.M., ROKE WAS LOCATED NEAR
     21.7 DEGREES NORTH, 116.3 DEGREES EAST. IT IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT AT
     ABOUT 11 KNOTS EDGING CLOSER TO THE VICINITY OF
     THE PEARL RIVER DELTA. MEANWHILE, THE TROPICAL
     DEPRESSION OVER THE SEAS EAST OF HAINAN ISLAND
     WAS LOCATED NEAR 17.9 DEGREES NORTH, 111.5
     DEGREES EAST. IT IS FORECAST TO MOVE NORTHWEST
     SLOWLY TOWARDS HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0300 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  010/10
                  BEC 330/20-25
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  010/10-15
                  BEC 320/20-25, OCNL 30               26-30
   B.   2000 FT:  010/10-15, OCNL 20                   24
   C.   5000 FT:  070/20-25                            19
   D.  10000 FT:  080/20-25                            11
   E.  18000 FT:  090/15                               MS2
   F.  24000 FT:  110/15                               MS13
   G.  30000 FT:  120/10                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY. OCCASIONAL SQUALLY SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 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: 17000 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 1.5-3.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHEASTERLY WINDS, FRESH OFFSHORE.
     MAINLY CLOUDY. ISOLATED 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 03:25 HKT on 23 Jul 17

    VHHK SIGMET 6 VALID 221740/222140 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N2012 E11648 - N2100 E11354 - N2236 E11412 - N2318 E11730 - N2100 E11730 TOP FL450 MOV W 10KT NC= VHHK SIGMET 7 VALID 221925/230000 VHHH- VHHK HONG KONG FIR TC ROKE PSN N2142 E11618 CB OBS AT 1800Z WI 120NM OF TC CENTRE TOP FL450 NC FCST AT 0000Z TC CENTRE PSN N2200 E11454=

    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 03:45 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 is in force.

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

    At 4 a.m., Tropical Storm Roke was estimated to be about 170 kilometres east-southeast of Hong Kong (near 21.9 degrees north 115.8 degrees east) and is forecast to move west-northwest at about 20 kilometres per hour edging closer to the vicinity of the Pearl River Delta.

    Roke continues to move steadily towards the vicinity of the Pearl River Delta. It is expected to enter the 100 km area of the territory and the Strong Wind Signal No. 3 will persist. The Observatory will closely monitor the future movement of Roke, and consider the need to issue higher tropical cyclone warning signal.

    As the circulation of Roke is small, winds will strengthen significantly only when Roke is rather close to Hong Kong. The public should stay on the alert and not to relax precautions.

    There will be squally showers over the coast of Guangdong and there will also be swells. You are advised to stay away from the shoreline and not to engage in water sports.

    (Precautionary Announcements with No. 3 Signal)

    1. You are advised not to delay in taking all precautions to protect your home or property. Make sure now that all loose objects are secure. Porch furniture, flower pots and other objects likely to be blown away should be taken indoors. Check again and make sure all windows and doors can be securely locked.

    2. Storm water drains should be cleared of leaves and rubbish, this applies particularly to dwellers in low-lying areas.

    3. Fishing vessels not yet in typhoon shelters should seek shelter without delay. Check again that all deck fittings are firmly fastened. If available, heavy anchors should be prepared and used in addition to regular anchors.

    4. People should avoid walking or working in areas exposed to gales and squalls. Drivers using highways and flyovers should be alert to violent gusts.

    5. 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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    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 03:31 HKT 23/Jul/2017


    Tropical Cyclone Warning

    At 221800 UTC, Tropical Depression over the seas east of Hainan Island with central pressure 1002 hectopascals was centred within 60 nautical miles of one seven point nine degrees north (17.9 N) one one one point three degrees east (111.3 E) and is forecast to move 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 231800 UTC
    One eight point one degrees north (18.1 N)
    One one zero point nine degrees east (110.9 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 241800 UTC
    One eight point four degrees north (18.4 N)
    One zero nine point six degrees east (109.6 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 251800 UTC
    One eight point eight degrees north (18.8 N)
    One zero six point four degrees east (106.4 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 261800 UTC
    Dissipated over land.

    Bulletin issued at 03:30 HKT 23/Jul/2017


    Tropical Cyclone Warning

    Tropical Depression Roke (1707) has intensified into a Tropical Storm with central pressure 996 hectopascals. At 221800 UTC, it was centred within 60 nautical miles of two one point seven degrees north (21.7 N) one one six point three degrees east (116.3 E) and is forecast to move 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 231800 UTC
    Two two point eight degrees north (22.8 N)
    One one one point eight degrees east (111.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 241800 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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