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Bulletin issued at 17:31 HKT 01/Sep/2017

At 5 p.m. at the Hong Kong Observatory the air temperature was 29 degrees Celsius and the relative humidity 78 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.5. The intensity of UV radiation was low.

Mawar moved generally northward today, adopting a track farther away from Hong Kong. Mawar is expected to intensify progressively and make landfall over the coast of eastern Guangdong on Sunday. Since Mawar's track is farther away, its threat to Hong Kong is relatively low in the short term. Depending on Mawar's intensity change and movement, the Observatory will consider whether or not to issue the Standby Signal No. 1 tomorrow (Saturday). Members of the public should take note of the latest weather situation in planning outdoor activities on Saturday and Sunday.

Gusts reaching 70 kilometres per hour or above may affect Hong Kong.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 7:00 p.m. today. Squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 29 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 32 degrees;
Lau Fau Shan 31 degrees;
Tai Po 29 degrees;
Sha Tin 29 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 30 degrees;
Sai Kung 31 degrees;
Cheung Chau 25 degrees;
Chek Lap Kok 31 degrees;
Tsing Yi 28 degrees;
Shek Kong 30 degrees;
Tsuen Wan Ho Koon 27 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 28 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 28 degrees;
Happy Valley 29 degrees;
Wong Tai Sin 29 degrees;
Stanley 26 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 28 degrees;
Kai Tak Runway Park 30 degrees;
Yuen Long Park 31 degrees;
Tai Mei Tuk 29 degrees.

Between 3:45 and 4:45 p.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Tsuen Wan 0 to 33 mm;
Islands District 0 to 28 mm;
Central & Western District 0 to 25 mm;
Sha Tin 0 to 6 mm;
Southern District 0 to 4 mm;
Tuen Mun 0 to 3 mm;
Kowloon City 0 to 1 mm;
Wong Tai Sin 0 to 1 mm.

Here is the information on Tropical Depression Mawar at 4 p.m.:
Location: 20.4 degrees north, 118.5 degrees east.


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


Climatological Information for 1 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 16:45 HKT 01/Sep/2017

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

A continental airstream is affecting Guangdong. Meanwhile, thundery showers triggered by the high temperatures are affecting the region.

At 4 p.m., Tropical Depression Mawar was centred about 190 kilometres east of Dongsha. It is forecast to be slow-moving and lingering over the northeastern part of the South China Sea.

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. Showers will be heavier at times with squally thunderstorms tonight and later tomorrow. The minimum temperature will be about 27 degrees. Hazy with sunny intervals tomorrow. The maximum temperature will be around 32 degrees. Moderate northerly winds, occasionally fresh offshore later.

Outlook : Windier with occasional squally showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 02/09/2017; 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 01/Sep/2017

GALE WARNING AREAS: KWANGTUNG, BASHI, PRATAS AND BALINTANG.

GENERAL SITUATION AT 312100 UTC:
FOR DETAILS ON TROPICAL DEPRESSION MAWAR (1716), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 010100 UTC:

HONG KONG= N 4-5. DOWN TO 4000 M IN SOME HAZE. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. TEMP 33-27 C. =
KWANGTUNG= N TO NE 6-7, OCNL 8 IN E LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M IN E LATER. SWELL NE 2 M. =
TAIWAN STRAIT= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
BASHI= E TO SE 6-7, OCNL 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3 M. =
PRATAS= NE 7, OCNL 8, BEC CYCLONIC UP TO 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M, BEC 8 M. SWELL NE 3 M. =
BALINTANG= CYCLONIC 7, OCNL 8, BEC S UP TO 8. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 6 M. SWELL NE 3 M. =
SCARBOROUGH= W TO SW 6-7. DOWN TO 1000 M IN SCT HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL NE 2 M. =
PARACEL= W TO NW 4-5, OCNL 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE 2 M. =
TONKIN= NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= NW 4-5. ISOL SHOWERS AND TS. SEA 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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    South China Coastal Waters

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    Bulletin issued at 16:30 HKT 01/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 01 September 2017

    Warnings:
    Storm force winds in Nan'ao and Shanwei. Strong winds in Hong Kong adjacent waters, south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    At 4 p.m., Tropical Depression Mawar with maximum sustained winds of about 55 kilometres per hour near its centre was located near 20.4 degrees north, 118.5 degrees east. It is forecast to be moving slowly and lingering over the northeastern part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 4 to 5, up to force 6 later.
    Scattered heavy squally showers and thunderstorms. Some haze later.
    Moderate seas, becoming rough seas later.

    Nan'ao and Shanwei:
    North to northeast force 7 to 8, becoming cyclonic up to force 10 later.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas, becoming high seas later.

    South of Hong Kong:
    North to northwest force 6 to 7.
    Scattered heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    Northwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Cyclonic winds up to force 12 in east. Becoming southwesterly winds of force 7 to 8 later. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind southwest force 3
      Visibility 16 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind north force 4
      Visibility 8 Kilometres in rain

    Macau Wind southeast force 2
      Visibility 7 Kilometres

    Xisha Wind west force 2
      Visibility 30 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 01/SEP/2017
    (Next update at 01:30 HKT 02/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 4 P.M., TROPICAL DEPRESSION MAWAR WAS CENTRED
     NEAR 20.4 DEGREES NORTH, 118.5 DEGREES EAST. IT
     IS FORECAST TO BE MOVING SLOWLY AND LINGERING
     OVER THE NORTHEASTERN PART OF THE SOUTH CHINA
     SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  340/5-10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  340/10                               30-27
   B.   2000 FT:  010/10                               24
   C.   5000 FT:  030/20                               19
   D.  10000 FT:  020/20                               11
   E.  18000 FT:  020/20                               MS3
   F.  24000 FT:  030/20                               MS12
   G.  30000 FT:  090/15                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH SHOWERS. SHOWERS WILL BE
      HEAVIER AT TIMES AT FIRST. ISOLATED SQUALLY
      THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 3500 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 10200 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHWESTERLY WINDS, OCCASIONALLY
     FRESH OFFSHORE.  HAZY WITH SUNNY INTERVALS. A
     FEW SHOWERS. SHOWERS WILL BE HEAVIER AT TIMES
     WITH SQUALLY THUNDERSTORMS LATER.=

    ===================================================================
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 17:00 HKT on 01 Sep 17

    VHHK SIGMET 4 VALID 010900/011300 VHHH- VHHK HONG KONG FIR EMBD TS FCST NE OF LINE N1848 E11542 - N2236 E11400 TOP FL420 MOV SW 10KT NC= VHHK SIGMET 5 VALID 010900/011300 VHHH- VHHK HONG KONG FIR EMBD TS FCST NE OF LINE N1848 E11542 - N2236 E11400 TOP FL420 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.

    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 15:30 HKT 01/Sep/2017


    Tropical Cyclone Warning

    At 010600 UTC, Tropical Depression Mawar (1716) with central pressure 998 hectopascals was centred within 90 nautical miles of two zero point three degrees north (20.3 N) one one eight point five degrees east (118.5 E) and is forecast to be slow moving 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 over eastern semicircle, 90 nautical miles elsewhere.

    Forecast position and intensity at 020600 UTC
    Two one point three degrees north (21.3 N)
    One one seven point seven degrees east (117.7 E)
    Maximum winds 45 knots.

    Forecast position and intensity at 030600 UTC
    Two two point six degrees north (22.6 N)
    One one six point five degrees east (116.5 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 040600 UTC
    Two four point nine degrees north (24.9 N)
    One one four point nine degrees east (114.9 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 050600 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 01/Sep/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.8 C
Minimum Air Temperature                     26.2 C
Grass Minimum Temperature                   24.7 C
Relative Humidity                        65 - 91 Percent
Rainfall                                     4.1 mm 
Total rainfall since 1st January          2248.9 mm
Against an average of                     1905.5 mm

Other Stations                Min                  Max
King's Park                  25.9 C               32.6 C
Wong Chuk Hang               24.9 C               32.3 C
Ta Kwu Ling                  24.7 C               34.4 C
Sha Tin                      25.9 C               34.6 C
Tuen Mun                     24.5 C               33.5 C
Tseung Kwan O                24.4 C               33.6 C
Sai Kung                     25.8 C               33.0 C
Cheung Chau                  24.3 C               33.6 C
Chek Lap Kok                 24.7 C               33.4 C
Tsing Yi                     24.8 C               32.6 C
Shek Kong                    24.2 C               34.6 C
Tsuen Wan Ho Koon            24.2 C               31.3 C
Tsuen Wan Shing Mun Valley   24.3 C               32.8 C
Hong Kong Park               24.8 C               33.5 C
Shau Kei Wan                 25.7 C               33.6 C
Kowloon City                 25.7 C               33.5 C
Happy Valley                 25.5 C               34.5 C
Wong Tai Sin                 25.1 C               33.5 C
Stanley                      25.8 C               33.1 C
Kwun Tong                    25.9 C               33.8 C
Sham Shui Po                 25.5 C               33.7 C
Kai Tak Runway Park          25.8 C               32.3 C
Yuen Long Park               24.8 C               34.7 C
Tai Mei Tuk               26.3 C               34.0 C

Duration of sunshine (King's Park):              6.9 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 9.
Sea surface temperature (Waglan Island):        26.4 C 

Yesterday's (31 Aug 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                             0.09
Kat O                               0.08
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 31 Aug
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