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Bulletin issued at 11:11 HKT 02/Jul/2017

At 11 a.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 83 per cent.
During the past hour the mean UV Index recorded at King's Park was 5. The intensity of UV radiation was moderate.

Gusts reaching 80 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 12:15 p.m. today. Isolated squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 31 degrees;
Tai Po 29 degrees;
Sha Tin 31 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 31 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 31 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 30 degrees;
Hong Kong Park 31 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 30 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 30 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 30 degrees.

Between 9:45 and 10:45 a.m., the rainfall recorded in various regions were:

Yuen Long 0 to 9 mm;
Islands District 0 to 9 mm;
Tsuen Wan 0 to 8 mm;
Tuen Mun 0 to 2 mm.


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


Climatological Information for 2 Jul

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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Bulletin updated at 11:15 HKT 02/Jul/2017

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

An active southerly airstream is bringing thundery showers to the coast of Guangdong.

Besides, the tropical depression over the seas east of Taiwan was named Nanmadol. At 10 a.m., Nanmadol was centred about 680 kilometres southeast of Taibei. It is forecast to move north-northwest at about 30 kilometres per hour across the seas east of Taiwan.

Weather forecast for today

Mainly cloudy with showers and a few squally thunderstorms. Showers will be heavy in some areas at first. Moderate to fresh southerly winds.

Outlook : A few showers tomorrow. It will be hot with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 02/07/2017; 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 02/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 012100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 020100 UTC:

HONG KONG= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. TEMP 31-27 C. =
KWANGTUNG= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BASHI= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= S TO SE 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S 5. ISOL SHOWERS AND TS. SEA 2 M. =
TONKIN= S TO SW 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. =
DANANG= S 5-6. ISOL SHOWERS AND TS. SEA 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 10:25 HKT 02/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 10:25 a.m. on 02 July 2017

    Weather Situation:
    A southerly airstream is affecting the south China coastal waters.

    At 10 a.m., Tropical Depression Nanmadol with maximum sustained winds of about 55 kilometres per hour near its centre was located at 21.2 degrees north, 126.7 degrees east. It is forecast to move north-northwest at about 30 kilometres per hour across the seas east of Taiwan.

    Area forecasts for the next 24 hours

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

    Nan'ao and Shanwei:
    South force 4 to 5.
    Scattered showers and squally thunderstorms.
    Moderate seas.

    South of Hong Kong and Shangchuan Dao:
    South force 5.
    Scattered showers and squally 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 south-southwest force 4
      Visibility 26 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south-southeast force 3
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 5

    Macau Wind south force 3
      Visibility 21 Kilometres

    Xisha Wind south-southwest force 3
      Visibility 19 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 09:30 HKT 02/JUL/2017
    (Next update at 17:30 HKT 02/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 IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  180/10-15, OCNL 20                   29-32
   B.   2000 FT:  200/15-20                            25
   C.   5000 FT:  200/20                               19
   D.  10000 FT:  220/25                               12
   E.  18000 FT:  230/25                               MS1
   F.  24000 FT:  220/15                               MS12
   G.  30000 FT:  180/5                                MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SCATTERED SHOWERS AND
      ISOLATED THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2800 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) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
                      MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS. MAINLY CLOUDY WITH
     SCATTERED SHOWERS AND ISOLATED 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 15:00 HKT on 01 Jul 17

    VHHK SIGMET 4 VALID 010700/010930 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2336 E11730 - N2242 E11730 - N2142 E11654 - N2154 E11612 - N2300 E11618 - N2336 E11730 TOP FL420 MOV NNE 05KT WKN=

    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

    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 02/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   25.5 C
Relative Humidity                        67 - 94 Percent
Rainfall                                     7.4 mm 
Total rainfall since 1st January          1203.2 mm
Against an average of                     1106.4 mm

Other Stations                Min                  Max
King's Park                  26.2 C               31.5 C
Wong Chuk Hang               26.8 C               31.3 C
Ta Kwu Ling                  25.2 C               33.1 C
Lau Fau Shan                 25.5 C               32.9 C
Tai Po                       25.4 C               32.4 C
Sha Tin                      25.9 C               33.2 C
Tuen Mun                     25.7 C               33.1 C
Tseung Kwan O                25.4 C               32.4 C
Sai Kung                     25.7 C               33.2 C
Cheung Chau                  25.0 C               31.8 C
Chek Lap Kok                 27.5 C               33.6 C
Tsing Yi                     24.7 C               32.1 C
Shek Kong                    26.1 C               32.9 C
Tsuen Wan Ho Koon            24.6 C               30.7 C
Tsuen Wan Shing Mun Valley   25.2 C               31.5 C
Hong Kong Park               26.3 C               31.8 C
Shau Kei Wan                 25.9 C               31.4 C
Kowloon City                 25.7 C               32.2 C
Happy Valley                 27.2 C               32.0 C
Wong Tai Sin                 26.1 C               31.8 C
Stanley                      26.4 C               32.4 C
Kwun Tong                    26.4 C               32.6 C
Sham Shui Po                 24.7 C               32.1 C
Kai Tak Runway Park          26.4 C               31.9 C
Yuen Long Park               25.7 C               32.5 C
Tai Mei Tuk               25.6 C               33.1 C

Duration of sunshine (King's Park):              5.5 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 8.
Sea surface temperature (Waglan Island):        24.3 C 

Yesterday's (01 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                         0.12
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 01 Jul
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