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Bulletin issued at 23:02 HKT 12/Sep/2017

At 11 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 73 per cent.

The air temperatures at other places were:

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

Here is the information on Tropical Depression Doksuri at 11 p.m.:
Location: 15.1 degrees north, 119.2 degrees east.


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


Climatological Information for 12 Sep


Local Weather Forecast
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Local Weather Forecast

Automatic Regional Weather Forecast in Hong Kong & Pearl River Delta Region

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Bulletin updated at 23:15 HKT 12/Sep/2017

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

An easterly airstream gradually affected the coast of Guangdong today. Locally, it was mainly fine, hazy and very hot, but convective activities triggered by high temperatures brought thundery showers to the territory in the afternoon. More than 10 millimetres of rainfall were recorded over many places in the New Territories, Lantau Island and the Central and Western District. The easterly airstream will continue to affect the coast of Guangdong tomorrow.

Besides, the area of low pressure near the Philippines intensified into a tropical depression today and was named Doksuri. At 11 p.m., Doksuri was centred about 200 kilometres west-northwest of Manila. It is forecast to move west-northwest at about 18 kilometres per hour across the South China Sea and intensify gradually. Meanwhile, Typhoon Talim was centred about 660 kilometres east-southeast of Taibei. It is forecast to intensify gradually and move northwest or west-northwest at about 22 kilometres per hour towards the East China Sea.

Weather forecast for Hong Kong (Wednesday, 13 Sep 2017)

Mainly cloudy with a few showers and some haze. Temperatures will range between 27 and 32 degrees. Temperatures over the New Territories will be a couple of degrees higher than that over the urban areas. Sunny intervals during the day. Moderate to fresh east to northeasterly winds.

Outlook : Very hot with sunny periods on Thursday. There will be squally showers in the latter part of this week.


(The above forecast period is valid up to 23:59 HKT tomorrow, 13/09/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)



MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 12/Sep/2017

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND SCARBOROUGH.

GENERAL SITUATION AT 120900 UTC:
FOR DETAILS ON THE TROPICAL DEPRESSION NEAR THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 121300 UTC:

HONG KONG= E TO NE 4-5, OCNL 6. DOWN TO 5000 M IN HAZE. A FEW SHOWERS.. SEA 2 M. TEMP 27-32 C. =
KWANGTUNG= E TO NE 5-6, OCNL 7. ISOL SHOWERS AND TS. SEA 3 M. =
TAIWAN STRAIT= NE 6-7, 8 LATER. ISOL SHOWERS AND TS. SEA 3-4 M, 6 M LATER. =
BASHI= E TO NE 6-7, 8 IN E LATER. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M, 6 M IN E LATER. SWELL E TO NE 3-5 M. =
PRATAS= E TO NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 2 M. =
BALINTANG= E TO NE 6-7. DOWN TO 1000 M IN OCNL SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL E TO NE 3 M. =
SCARBOROUGH= CYCLONIC 6-7, 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, 6-8 M LATER. SWELL NE 3-5 M. =
PARACEL= N TO NE 5-6, 7 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. SWELL E TO NE 2 M. =
TONKIN= NE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= N TO NE 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.



SOUTH CHINA COASTAL WATERS
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South China Coastal Waters

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Bulletin issued at 23:30 HKT 12/Sep/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 12 September 2017

Warnings:
Strong winds in all areas.

Weather Situation:
At 11 p.m., Tropical Depression Doksuri with maximum sustained winds of about 55 kilometres per hour near its centre was located at 15.1 degrees north, 119.2 degrees east. It is forecast to move west-northwest at about 18 kilometres per hour across the South China Sea and intensify gradually. Meanwhile, Typhoon Talim with maximum sustained winds of about 140 kilometres per hour near its centre was located at 22.9 degrees north, 127.6 degrees east. It is forecast to intensify gradually and move northwest or west-northwest at about 22 kilometres per hour towards the East China Sea.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
East to northeast force 4 to 5, occasionally force 6.
Some haze. A few showers.
Moderate to rough seas.

Nan'ao, Shanwei and South of Hong Kong:
East to northeast force 5 to 6, occasionally force 7.
Isolated showers and thunderstorms.
Moderate to rough seas.

Shangchuan Dao:
East to northeast force 5 to 6.
Isolated showers and thunderstorms.
Moderate to rough seas.

Outlook for the next 48 hours
East to southeasterly winds of force 7 to 8. Scattered squally showers and thunderstorms.

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

Waglan Island Wind northeast force 4
  Visibility 28 Kilometres

Shantou Wind east force 2
  Visibility 30 Kilometres

Dongsha Wind north-northeast force 3
  Visibility 10 Kilometres

Macau Wind northeast force 1
  Visibility 10 Kilometres

Xisha Wind north-northeast force 3
  Visibility 30 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 17:30 HKT 12/SEP/2017
(Next update at 01:30 HKT 13/SEP/2017)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THUNDERY SHOWERS TRIGGERED BY HIGH TEMPERATURES
     ARE AFFECTING GUANGDONG.
     AT 4 P.M., THE TROPICAL DEPRESSION OVER THE
     PHILIPPINES WAS CENTRED NEAR 14.6 DEGREES NORTH,
     120.6 DEGREES EAST.  IT IS FORECAST TO MOVE WEST
     OR WEST-NORTHWEST AT ABOUT 10 KNOTS ENTERING THE
     SOUTH CHINA SEA AND INTENSIFYING GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5-10 BEC 060/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  060/5-10 BEC 060/15, OCNL 20         32-27
   B.   2000 FT:  150/10 BEC 060/15, OCNL 20           24
   C.   5000 FT:  050/15                               20
   D.  10000 FT:  070/15                               12
   E.  18000 FT:  100/15                               MS2
   F.  24000 FT:  130/10                               MS13
   G.  30000 FT:  060/20                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.  ISOLATED
      THUNDERSTORMS AT FIRST.  LOCALIZED HAZE/MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/HAZE/MIST.
                      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     : 1.0BEC2.0 M   SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EAST TO NORTHEASTERLY WINDS.
     SUNNY INTERVALS AND A FEW SHOWERS.  LOCALIZED
     HAZE.=
===================================================================
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 15:26 HKT on 09 Sep 17

VHHK SIGMET 2 VALID 090717/091115 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2036 E11430 - N2036 E11130 AND W OF E11430 TOP FL350 MOV NE 10KT NC= VHHK SIGMET 4 VALID 090726/091115 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N2030 W OF E11430 TOP FL350 MOV NE 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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Last revision date: <12 Sep 2017> 

TROPICAL CYCLONE WARNING FOR SHIPPING
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Tropical Cyclone Warning for Shipping

Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
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South China Coastal Waters |  Marine Forecast
Severe Weather Information Centre

Bulletin issued at 21:55 HKT 12/Sep/2017


Tropical Cyclone Warning

The tropical depression near the Philippines was named Doksuri(1719). At 121200 UTC, Doksuri with central pressure 998 hectopascals was centred within 90 nautical miles of one four point nine degrees north (14.9 N) one one nine point six degrees east (119.6 E) and is forecast to move west-northwest at about 10 knots for the next 24 hours..

Maximum winds near the centre are estimated to be 30 knots.

Radius of over 2 metre waves 180 nautical miles.

Forecast position and intensity at 131200 UTC
One six point one degrees north (16.1 N)
One one six point four degrees east (116.4 E)
Maximum winds 50 knots.

Forecast position and intensity at 141200 UTC
One seven point two degrees north (17.2 N)
One one three point zero degrees east (113.0 E)
Maximum winds 70 knots.

Forecast position and intensity at 151200 UTC
One eight point six degrees north (18.6 N)
One zero nine point seven degrees east (109.7 E)
Maximum winds 70 knots.

Forecast position and intensity at 161200 UTC
Two zero point four degrees north (20.4 N)
One zero four point nine degrees east (104.9 E)
Maximum winds 40 knots.

Forecast position and intensity at 171200 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 12/Sep/2017
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     27.6 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        61 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2348.1 mm
Against an average of                     2031.2 mm

Other Stations                Min                  Max
King's Park                  27.3 C               32.5 C
Wong Chuk Hang               26.1 C               32.1 C
Ta Kwu Ling                  24.7 C               34.7 C
Lau Fau Shan                 26.1 C               32.4 C
Tai Po                       25.7 C               32.8 C
Sha Tin                      26.1 C               33.9 C
Tuen Mun                     26.1 C               33.4 C
Tseung Kwan O                25.9 C               32.9 C
Sai Kung                     26.7 C               32.3 C
Cheung Chau                  26.6 C               34.4 C
Chek Lap Kok                 27.0 C               33.5 C
Tsing Yi                     26.0 C               32.4 C
Shek Kong                    25.5 C               34.6 C
Tsuen Wan Ho Koon            24.9 C               31.5 C
Tsuen Wan Shing Mun Valley   25.3 C               33.3 C
Hong Kong Park               26.5 C               32.6 C
Shau Kei Wan                 27.0 C               32.3 C
Kowloon City                 27.2 C               34.1 C
Happy Valley                 26.4 C               33.8 C
Wong Tai Sin                 26.1 C               33.5 C
Stanley                      26.7 C               32.8 C
Kwun Tong                    27.4 C               32.6 C
Sham Shui Po                 27.2 C               33.4 C
Kai Tak Runway Park          27.4 C               32.9 C
Yuen Long Park               26.1 C               35.1 C
Tai Mei Tuk               26.2 C               34.2 C

Duration of sunshine (King's Park):              10.8 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        27.5 C 

Yesterday's (11 Sep 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                         0.11
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
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 11 Sep
Last revision date: <12 Sep 2017> 

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