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Bulletin issued at 00:02 HKT 29/Jul/2017

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 78 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 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 28 degrees;
Lau Fau Shan 28 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 29 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 28 degrees;
Kowloon City 29 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 29 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 29 degrees;
Tai Mei Tuk 28 degrees.

Here is the information on Typhoon Nesat at 11:00 p.m. yesterday:
Location: 21.5 degrees north, 124.1 degrees east.

Here is the information on Tropical Depression at 11:00 p.m. yesterday:
Location: 18.7 degrees north, 115.7 degrees east.


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


Climatological Information for 29 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 00:00 HKT 29/Jul/2017

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

The weather was generally fine over the coast of southeastern China yesterday. Locally, it was mainly fine and very hot. Temperatures in many places rose to above 33 degrees. Under the influence of a continental airstream, it will be very hot over the coast of Guangdong today and tomorrow.

The area of low pressure over the northern part of the South China Sea intensified into a tropical depression yesterday. At 11 p.m. last night, the tropical depression was centred about 240 kilometres south-southwest of Dongsha. It is forecast to move slowly and interact with Tropical Cyclone Nesat to the northeast of Luzon. The tropical depression will linger around the northern part of the South China Sea today and then move towards the vicinity of Taiwan Strait on Sunday. Meanwhile, Nesat intensified from a severe tropical strom into a typhoon yesterday. At 11 p.m. last night, Nesat was centred about 410 kilometres east-southeast of Gaoxiong. It is forecast to move northwest at about 18 kilometres per hour towards Taiwan.

Weather forecast for Hong Kong (Saturday, 29 Jul 2017)

Mainly fine apart from isolated showers. The minimum temperature will be around 28 degrees. Very hot during the day with a maximum temperature of about 33 degrees in the urban areas, and a couple of degrees higher in the New Territories. Moderate north to northeasterly winds, fresh at times.

Outlook : Very hot and hazy on Sunday with a few showers later. More showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 29/07/2017; 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 28/Jul/2017

HURRICANE WARNING AREAS: TAIWAN STRAIT AND BASHI.
STORM WARNING AREA: BALINTANG.

GENERAL SITUATION AT 280900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION OVER NORTHERN PART OF THE SOUTH CHINA SEA AND TYPHOON NESAT (1709), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 281300 UTC:

HONG KONG= N TO NE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE UP TO 2 M. TEMP 28-33 C. =
KWANGTUNG= NE 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2 M. =
TAIWAN STRAIT= NE 6-7, CYCLONIC 12 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, 14 M LATER. SWELL SE 2 M. =
BASHI= CYCLONIC 12, BEC SW 11-12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M. SWELL E TO NE 5-7 M. =
PRATAS= CYCLONIC 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2-3 M. =
BALINTANG= W TO SW 10-11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M. SWELL E TO NE 3-5 M. =
SCARBOROUGH= S TO SW 6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SW 2-3 M. =
PARACEL= W TO SW 6-7. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SW 2-3 M. =
TONKIN= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL SE UP TO 2 M. =
DANANG= W TO SW 4-5, OCNL 6. DOWN TO 2000 M IN SCT 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.


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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 28/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 28 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    At 11 p.m., the tropical depression over the northern part of the South China Sea with maximum sustained winds of about 55 kilometres per hour near its centre was located at 18.7 degrees north, 115.7 degrees east. It is forecast to move slowly and linger around the northern part of the South China Sea. Meanwhile, Typhoon Nesat with maximum sustained winds of about 120 kilometres per hour near its centre was located at 21.5 degrees north, 124.1 degrees east. It is forecast to move northwest at about 18 kilometres per hour towards Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 4 to 5, occasionally force 6.
    Isolated showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    Northeast force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 5 to 6, becoming southwesterly winds of force 6 to 7, up to force 8 in east. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind east-northeast force 3
      Visibility 17 Kilometres

    Shantou Wind northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east-northeast force 4

    Macau Wind south-southeast force 2
      Visibility 22 Kilometres

    Xisha Wind west-northwest force 3
      Visibility 20 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 22:20 HKT 28/JUL/2017
    (Next update at 01:30 HKT 29/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 8 P.M., THE TROPICAL DEPRESSION OVER THE NORTHERN PART
     OF THE SOUTH CHINA SEA WAS CENTRED ABOUT 18.8 DEGREES NORTH,
     115.9 DEGREES EAST. IT IS FORECAST TO MOVE SLOWLY AND LINGER
     OVER THE NORTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 2200 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  040/10
       OFFSHORE:  040/10-15, OCNL 20                   32-28
   B.   2000 FT:  040/15-20                            25
   C.   5000 FT:  040/10                               20
   D.  10000 FT:  090/20                               13
   E.  18000 FT:  090/20                               MS2
   F.  24000 FT:  080/20                               MS11
   G.  30000 FT:  080/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE. A FEW ISOLATED SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0-2.0 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS. MAINLY FINE APART FROM ISOLATED
     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 23:00 HKT on 28 Jul 17

    VHHK SIGMET 5 VALID 281100/281500 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1848 E11212 - N2030 E11430 - N1900 E11548 - N1642 E11400 - N1848 E11212 TOP FL480 MOV S 05KT NC= VHHK SIGMET 6 VALID 281500/281900 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1900 E11548 - N1642 E11400 - N1900 E11154 - N2018 E11342 - N1900 E11548 TOP FL480 STNR 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.

    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

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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    Bulletin issued at 00:31 HKT 29/Jul/2017


    Tropical Cyclone Warning

    At 281500 UTC, Typhoon Nesat (1709) with central pressure 965 hectopascals was centred within 30 nautical miles of two one point six degrees north (21.6 N) one two four point zero degrees east (124.0 E) and is forecast to move northwest at about 10 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 70 knots.

    Radius of over 33 knot winds 120 nautical miles.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 63 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 291500 UTC
    Two three point six degrees north (23.6 N)
    One one nine point nine degrees east (119.9 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 301500 UTC
    Two five point eight degrees north (25.8 N)
    One one eight point two degrees east (118.2 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 311500 UTC
    Two eight point one degrees north (28.1 N)
    One one eight point three degrees east (118.3 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 011500 UTC
    Three zero point one degrees north (30.1 N)
    One one nine point one degrees east (119.1 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 021500 UTC
    Dissipated over land.

    Bulletin issued at 00:30 HKT 29/Jul/2017


    Tropical Cyclone Warning

    At 281500 UTC, Tropical Depression over the northern part of South China Sea with central pressure 994 hectopascals was centred within 90 nautical miles of one eight point six degrees north (18.6 N) one one five point seven degrees east (115.7 E) and is forecast to move slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 30 knots.

    Radius of over 2 metre waves 120 nautical miles.

    Forecast position and intensity at 291500 UTC
    One nine point one degrees north (19.1 N)
    One one seven point four degrees east (117.4 E)
    Maximum winds 35 knots.

    Forecast position and intensity at 301500 UTC
    Two four point zero degrees north (24.0 N)
    One one nine point nine degrees east (119.9 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 311500 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 29/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.4 C
Minimum Air Temperature                     28.1 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        57 - 84 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1759.8 mm
Against an average of                     1439.0 mm

Other Stations                Min                  Max
King's Park                  27.8 C               33.9 C
Wong Chuk Hang               28.6 C               34.3 C
Ta Kwu Ling                  25.3 C               35.5 C
Lau Fau Shan                 26.1 C               34.6 C
Tai Po                       28.1 C               32.9 C
Sha Tin                      28.3 C               34.9 C
Tuen Mun                     27.0 C               34.7 C
Tseung Kwan O                27.2 C               34.2 C
Sai Kung                     28.4 C               33.9 C
Cheung Chau                  27.5 C               32.6 C
Chek Lap Kok                 28.7 C               36.0 C
Tsing Yi                     28.5 C               35.4 C
Shek Kong                    27.8 C               35.4 C
Tsuen Wan Ho Koon            26.2 C               33.7 C
Tsuen Wan Shing Mun Valley   27.3 C               34.2 C
Hong Kong Park               28.1 C               34.7 C
Shau Kei Wan                 27.6 C               33.1 C
Kowloon City                 27.6 C               34.6 C
Happy Valley                 28.7 C               36.0 C
Wong Tai Sin                 27.2 C               34.8 C
Stanley                      28.1 C               33.9 C
Kwun Tong                    27.6 C               33.7 C
Sham Shui Po                 28.0 C               35.5 C
Kai Tak Runway Park          28.6 C               34.3 C
Yuen Long Park               27.5 C               35.7 C
Tai Mei Tuk               27.4 C               33.9 C

Duration of sunshine (King's Park):              10.2 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 12.
 

Yesterday's (28 Jul 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.07 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                               0.07
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.08
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 28 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <29 Jul 2017> 

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