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Bulletin issued at 00:02 HKT 03/Jul/2017

At midnight at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 86 per cent.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 2:15 a.m. today. Isolated thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

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

Between 10:45 and 11:45 p.m., lightning was detected within New Territories East and New Territories West. The rainfall recorded in various regions were:

North District 0 to 16 mm;
Yuen Long 0 to 7 mm;
Islands District 0 to 4 mm;
Tai Po 0 to 4 mm;
Sham Shui Po 1 to 3 mm;
Tsuen Wan 0 to 3 mm;
Tuen Mun 0 to 2 mm;
Sai Kung 0 to 1 mm;
Kwai Tsing 0 to 1 mm;
Kwun Tong 0 to 1 mm.

Here is the information on Tropical Storm Nanmadol at 11:00 p.m. yesterday:
Location: 24.2 degrees north, 124.3 degrees east.


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


Climatological Information for 3 Jul

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Bulletin updated at 00:00 HKT 03/Jul/2017

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

A southerly airstream brought showers and thunderstorms to the south China coast yesterday. Locally, it was mainly cloudy with showers and a few squally thunderstorms. More than 20 millimetres of rainfall were recorded over many places of the New Territories, and rainfall even exceeded 40 millimetres over Tsuen Wan and North District. The southerly airstream will continue to bring showers to the coast of Guangdong in the next few days.

Besides, an area of low pressure over the western North Pacific intensified into a tropical storm progressively yesterday, and was named Nanmadol. At 11 p.m. last night, Nanmadol was centred about 300 kilometres east-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 Hong Kong (Monday, 3 Jul 2017)

Mainly cloudy with occasional showers and a few thunderstorms. Temperatures will range between 26 and 30 degrees. Moderate southerly winds, fresh at times.

Outlook : Sunny intervals and a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 03/07/2017; 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 02/Jul/2017

N0 WARNING.

GENERAL SITUATION AT 020900 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS. TROPICAL STORM NANMADOL (1703) 994 HPA 23N 125E NNW 16KT INTSF.

MARINE FORECAST FOR 24 HOURS FROM 021300 UTC:

HONG KONG= S 5, OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL S UP TO 2 M. TEMP 26-30 C. =
KWANGTUNG= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4-5, BEC 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M, BEC 3 M. SWELL SE UP TO 2 M. =
BASHI= S 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
PRATAS= S 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. SWELL SE 2 M. =
BALINTANG= S 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SE 2-3 M. =
SCARBOROUGH= S 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL S UP TO 2 M. =
PARACEL= S 5. ISOL SHOWERS AND TS. SEA 2 M. SWELL S UP TO 2 M. =
TONKIN= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL S UP TO 2 M. =
DANANG= S 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL S UP TO 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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    Bulletin issued at 23:30 HKT 02/Jul/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 02 July 2017

    Warnings:
    Strong winds in all areas.

    Weather Situation:
    A southerly airstream is bringing unsettled weather to the south China coastal waters.

    At 11 p.m., Tropical Storm Nanmadol with maximum sustained winds of about 75 kilometres per hour near its centre was located at 24.2 degrees north, 124.3 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 5, occasionally force 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
    South force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough 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 force 4
      Visibility 16 Kilometres

    Shantou Wind southeast force 2
      Visibility 30 Kilometres

    Dongsha Wind south force 2
      Visibility 10 Kilometres

    Huangmaozhou Wind south force 5

    Macau Wind south force 2
      Visibility 11 Kilometres

    Xisha Wind southwest force 3
      Visibility 18 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 02/JUL/2017
    (Next update at 01:30 HKT 03/JUL/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM CONTINUES TO BRING SHOWERS
     TO THE COASTAL AREAS OF GUANGDONG.
     AT 4 P.M., TROPICAL STORM NANMADOL WAS CENTRED
     NEAR 22.7 DEGREES NORTH, 125.3 DEGREES EAST.  IT
     IS FORECAST TO MOVE NORTH-NORTHWEST AT ABOUT 16
     KNOTS ACROSS THE SEAS EAST OF TAIWAN.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  190/10-15
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  190/15-20                            30-26
   B.   2000 FT:  200/15-20, OCNL 25                   23
   C.   5000 FT:  200/20                               19
   D.  10000 FT:  210/20                               11
   E.  18000 FT:  210/20                               MS3
   F.  24000 FT:  200/15                               MS13
   G.  30000 FT:  270/10                               MS25
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH OCCASIONAL SHOWERS AND
      ISOLATED SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT  BKN 10000 FT.  TEMPO
      FEW CB 800 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 AND NEAR HILLS.
                      MOD OFFSHORE.
   N. SEA STATE     : 2.0 M         SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS, FRESH AT TIMES.
     MAINLY CLOUDY WITH OCCASIONAL SHOWERS AND
     ISOLATED SQUALLY 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.

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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=

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    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

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    Bulletin issued at 00:30 HKT 03/Jul/2017


    Tropical Cyclone Warning

    At 021500 UTC, Tropical Storm Nanmadol (1703) with central pressure 990 hectopascals was centred within 60 nautical miles of two four point two degrees north (24.2 N) one two four point three degrees east (124.3 E) and is forecast to move north at about 16 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 40 knots.

    Radius of over 33 knot winds 30 nautical miles.
    Radius of over 2 metre waves 180 nautical miles over eastern semicircle, 120 nautical miles elsewhere.

    Forecast position and intensity at 031500 UTC
    Three one point three degrees north (31.3 N)
    One two six point zero degrees east (126.0 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 041500 UTC
    Become extratropical low.



    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.

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    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 03/Jul/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.3 C
Minimum Air Temperature                     26.2 C
Grass Minimum Temperature                   25.5 C
Relative Humidity                        79 - 91 Percent
Rainfall                                     8.8 mm 
Total rainfall since 1st January          1206.0 mm
Against an average of                     1115.5 mm

Other Stations                Min                  Max
King's Park                  26.1 C               30.6 C
Ta Kwu Ling                  25.8 C               31.3 C
Lau Fau Shan                 24.8 C               31.2 C
Tai Po                       25.6 C               29.0 C
Sha Tin                      26.6 C               31.4 C
Tuen Mun                     25.0 C               31.0 C
Tseung Kwan O                25.5 C               30.8 C
Sai Kung                     26.1 C               31.8 C
Cheung Chau                  25.4 C               28.4 C
Chek Lap Kok                 26.7 C               31.4 C
Tsing Yi                     25.2 C               30.9 C
Shek Kong                    26.4 C               30.8 C
Tsuen Wan Ho Koon            24.8 C               27.8 C
Tsuen Wan Shing Mun Valley   25.6 C               30.2 C
Hong Kong Park               24.9 C               30.7 C
Shau Kei Wan                 26.1 C               31.1 C
Kowloon City                 26.4 C               30.6 C
Happy Valley                 25.7 C               31.4 C
Wong Tai Sin                 25.5 C               31.3 C
Stanley                      25.0 C               30.9 C
Kwun Tong                    26.3 C               30.6 C
Sham Shui Po                 25.6 C               30.4 C
Kai Tak Runway Park          26.1 C               31.0 C
Yuen Long Park               25.8 C               31.0 C
Tai Mei Tuk               25.9 C               30.7 C

Duration of sunshine (King's Park):              0.9 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 6.
 

Yesterday's (02 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                               0.09
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                       0.12
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 02 Jul
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