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Bulletin issued at 10:02 HKT 28/Jul/2017

At 10 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 72 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Hot weather might cause adverse health effects. The Observatory advises the public to stay on the alert.

The air temperatures at other places were:

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


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


Climatological Information for 28 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 09:45 HKT 28/Jul/2017

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

The weather is generally fine over the coast of southeastern China. Meanwhile, a broad area of low pressure is bringing unsettled weather to the central and northern parts of the South China Sea.

At 10 a.m., Severe Tropical Storm Nesat was centred about 600 kilometres east-southeast of Gaoxiong. It is forecast to move northwest at about 15 kilometres per hour towards the vicinity of Taiwan.

Weather forecast for today

Mainly fine and hot apart from isolated showers. Moderate easterly winds, fresh at times.

Outlook : Sunny periods and a few showers tomorrow. More showers in the following couple of days.


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

HURRICANE WARNING AREAS: BASHI AND BALINTANG.

GENERAL SITUATION AT 272100 UTC:
SEVERE TROPICAL STORM NESAT (1709) 980 HPA 20N 126E NW 8 KT INTSF. LOW 1002 HPA 19N 117E QSTNR INTST NC.

MARINE FORECAST FOR 24 HOURS FROM 280100 UTC:

HONG KONG= E 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 32-28 C. =
KWANGTUNG= E TO NE 4-5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL SE 2 M. =
TAIWAN STRAIT= NE 5-6, 7 LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL SE 2 M. =
BASHI= NW 7-8, CYCLONIC UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, UP TO 14 M LATER. SWELL E TO NE 3-5 M. =
PRATAS= S TO SE 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL SE 2 M. =
BALINTANG= W TO NW 9-10, UP TO 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, UP TO 14 M LATER. SWELL E TO NE 3-5 M. =
SCARBOROUGH= S TO SW 5-6, 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 5-6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 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 2 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

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 09:30 HKT 28/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 28 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A broad area of low pressure is bringing unsettled weather to the central and northern parts of the South China Sea.

    At 9 a.m., Severe Tropical Storm Nesat with maximum sustained winds of about 110 kilometres per hour near its centre was located at 20.1 degrees north, 125.5 degrees east, it is forecast to move northwest at about 15 kilometres per hour towards the vicinity of Taiwan.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao and Shanwei:
    East force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    South of Hong Kong and Shangchuan Dao:
    Northeast force 4 to 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    East to northeasterly winds of force 5 to 6, southwesterly winds of up to force 7 later. Occasional squally showers and thunderstorms.

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

    Waglan Island Wind northeast force 4
      Visibility 18 Kilometres

    Shantou Wind east force 1
      Visibility 30 Kilometres

    Dongsha Wind east force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind north-northeast force 4

    Macau Wind north force 2
      Visibility 18 Kilometres

    Xisha Wind west 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 09:00 HKT 28/JUL/2017
    (Next update at 17:30 HKT 28/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE WEATHER IS GENERALLY FINE OVER THE COAST OF
     SOUTHEASTERN CHINA. MEANWHILE, A BROAD AREA OF
     LOW PRESSURE IS BRINGING UNSETTLED WEATHER TO
     THE CENTRAL AND NORTHERN PARTS OF THE SOUTH
     CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  060/15-20                            29-33
   B.   2000 FT:  080/15-20                            24
   C.   5000 FT:  090/20-25                            20
   D.  10000 FT:  070/20-25                            14
   E.  18000 FT:  080/15-20                            MS2
   F.  24000 FT:  120/20                               MS11
   G.  30000 FT:  110/10                               MS22
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      SUNNY PERIODS. ISOLATED SHOWERS AND
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT. TEMPO FEW CB 800 FT SCT 1200 FT
      BKN 4000 FT
   K. VISIBILITY    : 10 KM.  TEMPO 4000 M IN SHOWERS. TEMPO 2000 M IN THUNDERSTORMS.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 11800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS. MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 28 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS.
     MAINLY CLOUDY WITH 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.

    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 08:31 HKT on 28 Jul 17

    VHHK SIGMET 1 VALID 280031/280430 VHHH- VHHK HONG KONG FIR EMBD TS FCST SW OF LINE N2206 E11248 - N1936 E11618 TOP FL450 MOV SW 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.

    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

    There is no tropical cyclone warning for shipping*.




    *Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

    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 28/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.6 C
Minimum Air Temperature                     28.0 C
Grass Minimum Temperature                   27.3 C
Relative Humidity                        74 - 85 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1759.8 mm
Against an average of                     1424.8 mm

Other Stations                Min                  Max
King's Park                  27.5 C               30.8 C
Wong Chuk Hang               28.3 C               31.2 C
Ta Kwu Ling                  25.8 C               31.7 C
Lau Fau Shan                 25.8 C               32.3 C
Tai Po                       26.9 C               30.3 C
Sha Tin                      27.0 C               31.6 C
Tuen Mun                     26.6 C               32.6 C
Tseung Kwan O                26.6 C               30.9 C
Sai Kung                     27.6 C               31.0 C
Cheung Chau                  26.4 C               29.8 C
Chek Lap Kok                 28.4 C               33.7 C
Tsing Yi                     28.0 C               32.4 C
Shek Kong                    26.1 C               31.9 C
Tsuen Wan Ho Koon            25.2 C               30.5 C
Tsuen Wan Shing Mun Valley   25.9 C               31.1 C
Hong Kong Park               28.0 C               31.2 C
Shau Kei Wan                 27.2 C               32.4 C
Kowloon City                 27.2 C               31.2 C
Happy Valley                 28.2 C               32.0 C
Wong Tai Sin                 26.8 C               31.1 C
Stanley                      26.9 C               30.8 C
Kwun Tong                    27.3 C               30.7 C
Sham Shui Po                 27.5 C               32.7 C
Kai Tak Runway Park          28.4 C               31.2 C
Yuen Long Park               25.9 C               32.9 C
Tai Mei Tuk               26.9 C               31.2 C

Duration of sunshine (King's Park):              2.9 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 (27 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                          0.09
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 27 Jul
     2003copy right image | Important notices | Privacy policy Last revision date: <28 Jul 2017> 

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