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Bulletin issued at 01:02 HKT 23/Aug/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 73 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 29 degrees;
Wong Chuk Hang 29 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 28 degrees;
Tai Po 28 degrees;
Sha Tin 29 degrees;
Tuen Mun 28 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 29 degrees;
Cheung Chau 28 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 28 degrees;
Tsuen Wan Shing Mun Valley 28 degrees;
Hong Kong Park 29 degrees;
Shau Kei Wan 29 degrees;
Kowloon City 29 degrees;
Happy Valley 30 degrees;
Wong Tai Sin 29 degrees;
Stanley 29 degrees;
Kwun Tong 29 degrees;
Sham Shui Po 30 degrees;
Kai Tak Runway Park 29 degrees;
Yuen Long Park 30 degrees;
Tai Mei Tuk 29 degrees.

Here is the information on Typhoon Hato:
Location: 20.9 degrees north, 116.3 degrees east; Maximum sustained wind near its centre: 130 km/h.


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


Climatological Information for 23 Aug

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:45 HKT 23/Aug/2017

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

Tropical cyclone Hato intensified gradually from a tropical storm into a typhoon yesterday. Under the influence of outer subsiding air of Hato, it was very hot and hazy with sunny periods in Hong Kong yesterday. The maximum temperature recorded at the Observatory was 36.6 degrees, the highest ever recorded. There were also squally showers with thunderstorms in the afternoon. Hato is expected to bring heavy squally showers and swells to the coast of Guangdong today.

Weather forecast for Hong Kong

Strong northerly winds. Winds will continue to strengthen further. Becoming east to southeasterlies in the morning. Cloudy to overcast with heavy squally showers and thunderstorms. Temperatures will range between 26 and 30 degrees. Seas will be rough with swells.

Outlook : Still showery in the following few days.


(The above forecast period is valid up to 23:59 HKT today, 23/08/2017; 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/Aug/2017

HURRICANE WARNING AREAS: HONG KONG, KWANGTUNG AND PRATAS.
STORM WARNING AREA: PARACEL.
GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND BALINTANG.

GENERAL SITUATION AT 220900 UTC:
FOR DETAILS ON TYPHOON HATO (1713), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 221300 UTC:

HONG KONG= N 6-7, BEC CYCLONIC UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4 M, BEC 14 M. SWELL E 5-7 M. TEMP 26-30 C. =
KWANGTUNG= N TO NW 10-11, BEC CYCLONIC UP TO 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10 M, BEC 14 M. SWELL E TO NE 5-7 M. =
TAIWAN STRAIT= SE 7, UP TO 8 IN S AT FIRST. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 6 M. SWELL SE 3 M. =
BASHI= S TO SE 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3 M. =
PRATAS= CYCLONIC UP TO 12, BEC SE 9-10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 14 M. SWELL E 5-7 M. =
BALINTANG= S TO SE 7, UP TO 8 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL SW 3 M. =
SCARBOROUGH= S TO SW 6-7. DOWN TO 1000 M IN OCNL SQUALLY HEAVY SHOWERS AND TS. SEA 3-4 M. SWELL S 2 M. =
PARACEL= SW 6-7, BEC 11 IN N. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 10 M IN N. SWELL E TO NE 3 M. =
TONKIN= SW 5-6, UP TO 7 LATER. ISOL SHOWERS AND TS. SEA 2-3 M, UP TO 4 M LATER. =
DANANG= SW 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 23:30 HKT 22/Aug/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 22 August 2017

    Warnings:
    Hurricane force winds in all areas.

    Weather Situation:
    At 11 p.m., Typhoon Hato with maximum sustained winds of about 120 kilometres per hour near its centre was located at 20.7 degrees north, 116.8 degrees east. It is forecast to move west-northwest at about 25 kilometres per hour towards the coast of Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 6 to 7, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming phenomenal seas.

    Nan'ao:
    Southeast up to force 10, up to force 12 at first.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    Shanwei:
    Cyclonic up to force 12, becoming southeast up to force 10.
    Frequent heavy squally showers and thunderstorms.
    Phenomenal seas.

    South of Hong Kong:
    Northwest force 7 to 8, becoming cyclonic up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming phenomenal seas.

    Shangchuan Dao:
    Northwest force 6 to 7, becoming southwest up to force 12.
    Frequent heavy squally showers and thunderstorms.
    Rough seas, becoming phenomenal seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 5 to 6. Scattered squally showers and thunderstorms.

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

    Waglan Island Wind north-northeast force 5
      Visibility 22 Kilometres

    Shantou Wind east force 1
      Visibility 29 Kilometres

    Dongsha Wind north force 6
      Visibility 8 Kilometres in rain

    Huangmaozhou Wind northwest force 4

    Macau Wind north-northwest force 1
      Visibility 22 Kilometres

    Xisha Wind west-southwest force 3
      Visibility 30 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 17:30 HKT 22/AUG/2017
    (Next update at 01:30 HKT 23/AUG/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.  
     GALE FORCE WINDS ON HIGH GROUNDS. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 6 P.M., TYPHOON HATO WAS CENTRED NEAR  20.5
     DEGREES NORTH, 117.6 DEGREES EAST. IT IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 14
     KNOTS TOWARDS THE COAST OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/20-25G35
                  TEMPO VRB/30G40 IN TS                29-26
   B.   2000 FT:  060/20-25
                  BECMG 360/25-35G40                   25
   C.   5000 FT:  360/15
                  BECMG  060/40                        22
   D.  10000 FT:  010/25
                  BECMG 050/40                         12
   E.  18000 FT:  060/25
                  BECMG 060/40                         MS2
   F.  24000 FT:  070/25
                  BECMG/40                             MS12
   G.  30000 FT:  080/25
                  BECMG/40                             MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH HEAVY SQUALLY SHOWERS
      AND THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT BKN 5000 FT.  
      TEMPO FEW CB 800 FT  SCT 1200 FT BKN 4000 FT
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS. 
                      TEMPO 2000 M IN THUNDERSTORMS
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 11600 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 3.0-4.0 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     STRONG TO GALE NORTH TO NORTHEASTERLY WINDS,
     CYCLONIC UP TO HURRICANE FORCE WINDS OFFSHORE.
     CLOUDY TO OVERCAST WITH HEAVY 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.

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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 01:07 HKT on 23 Aug 17

    VHHK SIGMET 13 VALID 221315/221715 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1800 E11248 - N1930 E11130 - N2124 E11130 - N2224 E11330 - N2006 E11336 - N1800 E11454 - N1800 E11248 TOP FL450 MOV SW 15KT NC= VHHK SIGMET 19 VALID 221715/222115 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1724 E11318 - N1930 E11130 - N2124 E11130 - N2224 E11330 - N2006 E11336 - N1818 E11448 - N1724 E11318 TOP FL450 MOV SW 15KT NC= VHHK SIGMET 17 VALID 221627/222100 VHHH- VHHK HONG KONG FIR TC HATO PSN N2048 E11642 CB OBS AT 1500Z WI 180NM OF TC CENTRE TOP FL450 NC FCST AT 2100Z TC CENTRE PSN N2118 E11506=

    Please click here for more about the SIGMET

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    Tropical Cyclone Warnings

    Bulletin issued at 00:45 HKT 23/Aug/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 1 a.m., Typhoon Hato was estimated to be about 270 kilometres southeast of Hong Kong (near 20.9 degrees north 116.3 degrees east) and is forecast to move west-northwest at about 25 kilometres per hour towards the coast of Guangdong.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Severe Weather Information Centre

    Bulletin issued at 00:30 HKT 23/Aug/2017


    Tropical Cyclone Warning

    At 221500 UTC, Typhoon Hato (1713) with central pressure 965 hectopascals was centred within 30 nautical miles of two zero point eight degrees north (20.8 N) one one six point seven degrees east (116.7 E) and is forecast to move west-northwest at about 14 knots for the next 24 hours.

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

    Radius of over 33 knot winds 90 nautical miles over northern semicircle, 60 nautical miles elsewhere.
    Radius of over 47 knot winds 45 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 231500 UTC
    Two two point eight degrees north (22.8 N)
    One one zero point four degrees east (110.4 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 241500 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/Aug/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     36.6 C
Minimum Air Temperature                     28.0 C
Grass Minimum Temperature                   27.8 C
Relative Humidity                        53 - 87 Percent
Rainfall                                     2.0 mm 
Total rainfall since 1st January          1907.3 mm
Against an average of                     1800.0 mm

Other Stations                Min                  Max
King's Park                  27.0 C               36.9 C
Wong Chuk Hang               27.7 C               35.2 C
Ta Kwu Ling                  26.6 C               38.5 C
Lau Fau Shan                 26.7 C               37.4 C
Tai Po                       27.3 C               35.0 C
Sha Tin                      28.5 C               38.1 C
Tuen Mun                     27.2 C               37.4 C
Tseung Kwan O                26.2 C               37.9 C
Sai Kung                     27.4 C               36.1 C
Cheung Chau                  26.8 C               35.3 C
Chek Lap Kok                 26.6 C               37.5 C
Tsing Yi                     28.2 C               37.3 C
Shek Kong                    27.4 C               37.9 C
Tsuen Wan Ho Koon            27.2 C               35.3 C
Tsuen Wan Shing Mun Valley   27.7 C               36.8 C
Hong Kong Park               26.5 C               35.7 C
Shau Kei Wan                 24.8 C               35.8 C
Kowloon City                 27.2 C               37.9 C
Happy Valley                 27.6 C               37.6 C
Wong Tai Sin                 27.6 C               37.9 C
Stanley                      25.3 C               35.1 C
Kwun Tong                    26.4 C               37.0 C
Sham Shui Po                 28.0 C               38.1 C
Kai Tak Runway Park          26.0 C               37.3 C
Yuen Long Park               28.6 C               38.6 C
Tai Mei Tuk               26.1 C               36.4 C

Duration of sunshine (King's Park):              7.3 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 9.
Sea surface temperature (Waglan Island):        25.2 C 

Yesterday's (22 Aug 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 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                           0.09
Tap Mun                             0.09
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                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

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 Aug
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