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Weather Information for South China Coastal Waters

Bulletin issued at 05:02 HKT 18/Nov/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 92 per cent.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 21 degrees;
Ta Kwu Ling 20 degrees;
Lau Fau Shan 22 degrees;
Tai Po 21 degrees;
Sha Tin 22 degrees;
Tuen Mun 22 degrees;
Tseung Kwan O 21 degrees;
Sai Kung 22 degrees;
Cheung Chau 22 degrees;
Chek Lap Kok 24 degrees;
Tsing Yi 22 degrees;
Shek Kong 21 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 21 degrees;
Hong Kong Park 22 degrees;
Shau Kei Wan 22 degrees;
Kowloon City 22 degrees;
Happy Valley 22 degrees;
Wong Tai Sin 22 degrees;
Stanley 22 degrees;
Kwun Tong 23 degrees;
Sham Shui Po 23 degrees;
Kai Tak Runway Park 23 degrees;
Yuen Long Park 21 degrees;
Tai Mei Tuk 22 degrees.

Here is the information on Tropical Depression at 5 a.m.:
Location: 10.8 degrees north, 115.4 degrees east.


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


Climatological Information for 18 Nov


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

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Bulletin updated at 04:45 HKT 18/Nov/2017

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

The cold front now over northern Guangdong is moving southwards gradually. It is expected to reach the south China coastal areas today.

At 5 a.m., the tropical depression over the southern part of the South China Sea was centred about 120 kilometres east-northeast of Nansha Dao. It is forecast to move west-northwest at about 18 kilometres per hour in the general direction of southern Vietnam.

Weather forecast for today

Mainly fine apart from rather low visibility in the morning. Light winds. The maximum temperature will be around 25 degrees. Becoming cloudy with a few rain patches after midday, winds strengthening from the north. Temperatures falling appreciably to around 19 degrees at night.

Outlook : Windy with light rain tomorrow. Cool early next week.


(The above forecast period is valid up to 23:59 HKT today, 18/11/2017; 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 21:25 HKT 17/Nov/2017

GALE WARNING AREAS: TAIWAN STRAIT, BASHI AND TONKIN.

GENERAL SITUATION AT 170900 UTC:
THE NORTHEAST MONSOON IS EXPECTED TO AFFECT THE FORECAST AREAS. COLD FRONT 28N 110E 30N 116E S 12KT. FOR DETAILS ON TROPICAL DEPRESSION NEAR THE PHILIPPINES, PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 171325 UTC:

HONG KONG= E 4-5, BEC N 6. DOWN TO 4000 M IN MIST, RAIN PATCHES LATER. SEA UP TO 2 M, BEC 3 M. SWELL NE UP TO 2 M. TEMP 19-25 C. =
KWANGTUNG= E TO NE 4-5, BEC N TO NE 6-7. RAIN PATCHES. SEA UP TO 2 M, BEC 3-4 M. SWELL NE 2 M. =
TAIWAN STRAIT= E TO NE 4-5, BEC N TO NE 8-9. RAIN PATCHES. SEA UP TO 2 M, BEC 6-8 M. SWELL NE 2 M, UP TO 3 M LATER. =
BASHI= E 4-5, N TO NE 7-8 LATER. RAIN PATCHES. SEA UP TO 2 M, 4-6 M LATER. SWELL NE 2 M, UP TO 3 M LATER. =
PRATAS= E TO NE 4-5, N TO NE 6 LATER. RAIN PATCHES. SEA UP TO 2 M, 3 M LATER. SWELL NE 2 M. =
BALINTANG= E 4-5, N TO NE 6-7 LATER. RAIN PATCHES. SEA UP TO 2 M, 3-4 M LATER. SWELL NE 2 M, UP TO 3 M LATER. =
SCARBOROUGH= E TO NE 4-5, N TO NE 5-6 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M, 2-3 M LATER. SWELL NE 2 M. =
PARACEL= E TO NE 4-5, N TO NE 6 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M, 3 M LATER. SWELL NE 2 M. =
TONKIN= E TO SE 4-5, N TO NE 7-8 LATER. RAIN PATCHES. SEA UP TO 2 M, 4-6 M LATER. SWELL E UP TO 2 M. =
DANANG= E TO SE 4-5, N TO NE 6-7 LATER. ISOL SHOWERS AND TS IN S. SEA UP TO 2 M, 3-4 M LATER. SWELL NE 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 05:30 HKT 18/Nov/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 18 November 2017

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

Weather Situation:
The cold front over northern Guangdong is moving southwards gradually. The associated northeast monsoon will reach the south China coastal waters today.

At 5 a.m., Tropical Depression over the southern part of the South China Sea with maximum sustained winds of about 55 kilometres per hour near its centre was located near 10.8 degrees north, 115.4 degrees east. It is forecast to move west-northwest at about 18 kilometres per hour in the general direction of southern Vietnam.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
East force 4, becoming north force 6.
Visibility rather low in some areas in the morning, a few rain patches later.
Moderate seas, becoming rough.

Nan'ao:
East force 4, becoming north to northeast force 7 to 8.
Moderate seas, becoming rough to very rough.

Shanwei:
East force 4, becoming north to northeast force 6 to 7.
Moderate seas, becoming rough.

South of Hong Kong and Shangchuan Dao:
East force 4, becoming north to northeast force 6.
Moderate seas, becoming rough.

Outlook for the next 48 hours
North to northeasterly winds of force 6 to 7, force 8 in east. Isolated showers and thunderstorms.

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

Waglan Island Wind calm
  Visibility 7 Kilometres

Shantou Wind calm
  Visibility 5000 Metres in mist

Huangmaozhou Wind calm

Macau Wind southwest force 1
  Visibility 6 Kilometres

Xisha Wind calm
  Visibility 30 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 01:30 HKT 18/NOV/2017
(Next update at 9:00-9:30 HKT 18/NOV/2017)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A COLD FRONT HAS FORMED OVER CENTRAL CHINA AND IS MOVING
     SOUTHWARD GRADUALLY. THE ASSOCIATED NORTHEAST MONSOON WILL
     REACH THE SOUTH CHINA COAST TODAY.
     AT 11 P.M. LAST NIGHT, THE TROPICAL DEPRESSION NEAR THE
     PHILIPPINES WAS CENTRED NEAR 10.3 DEGREES NORTH, 116.2
     DEGREES EAST. IT IS FORECAST TO MOVE WEST-NORTHWEST AT ABOUT
     10 KNOTS ACROSS THE SOUTHERN PART OF THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  VRB/5
                  BEC 360/10-15
       OFFSHORE:  080/10
                  BEC 020/15-20                        22-25
   B.   2000 FT:  220/5-10
                  BEC 020/15-20                        20-18
   C.   5000 FT:  280/5
                  BEC 020/15                           16
   D.  10000 FT:  260/20                               11
   E.  18000 FT:  280/20                               MS1
   F.  24000 FT:  300/25                               MS14
   G.  30000 FT:  280/35                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4400-5000 FT.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW RAIN PATCHES. LOCALIZED MIST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 3000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 3000 M IN RAIN/MIST.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12000 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 1.0-2.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTH TO NORTHEASTERLY WINDS, OCCASIONALLY 
     STRONG OFFSHORE. MAINLY CLOUDY WITH A FEW RAIN PATCHES.=
===================================================================
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 10:00 HKT on 15 Nov 17

VHHK SIGMET Z99 VALID 150200/150210 VHHH- VHHK HONG KONG FIR THIS IS A TEST SIGMET, PLEASE DISREGARD=

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: <18 Nov 2017> 

TROPICAL CYCLONE WARNING FOR SHIPPING
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Tropical Cyclone Warning for Shipping

Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
Current Weather |  Local Weather Forecast |  9-day Weather Forecast
South China Coastal Waters |  Marine Forecast
Severe Weather Information Centre

Bulletin issued at 03:30 HKT 18/Nov/2017


Tropical Cyclone Warning

At 171800 UTC, Tropical Depression near the Philippines with central pressure 998 hectopascals was centred within 90 nautical miles of one zero point five degrees north (10.5 N) one one five point eight degrees east (115.8 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 60 nautical miles.

Forecast position and intensity at 181800 UTC
One one point four degrees north (11.4 N)
One one one point six degrees east (111.6 E)
Maximum winds 45 knots.

Forecast position and intensity at 191800 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 18/Nov/2017
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     26.2 C
Minimum Air Temperature                     22.9 C
Grass Minimum Temperature                   22.3 C
Relative Humidity                        74 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2568.9 mm
Against an average of                     2358.4 mm

Other Stations                Min                  Max
King's Park                  22.4 C               27.3 C
Wong Chuk Hang               22.4 C               27.9 C
Ta Kwu Ling                  21.0 C               28.8 C
Lau Fau Shan                 20.9 C               29.3 C
Tai Po                       21.5 C               25.8 C
Sha Tin                      22.1 C               29.0 C
Tuen Mun                     21.4 C               29.1 C
Tseung Kwan O                21.7 C               27.3 C
Cheung Chau                  21.7 C               26.8 C
Chek Lap Kok                 22.8 C               29.9 C
Tsing Yi                     22.4 C               29.9 C
Shek Kong                    20.7 C               31.1 C
Tsuen Wan Ho Koon            20.2 C               28.1 C
Tsuen Wan Shing Mun Valley   20.7 C               30.4 C
Hong Kong Park               22.4 C               27.7 C
Shau Kei Wan                 22.2 C               25.7 C
Kowloon City                 21.6 C               28.4 C
Happy Valley                 22.7 C               29.3 C
Wong Tai Sin                 21.7 C               28.6 C
Stanley                      22.3 C               26.7 C
Kwun Tong                    22.2 C               27.2 C
Sham Shui Po                 22.5 C               28.9 C
Kai Tak Runway Park          23.2 C               26.1 C
Yuen Long Park               20.7 C               29.9 C
Tai Mei Tuk               21.4 C               27.7 C

Duration of sunshine (King's Park):              9.8 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 7.
Sea surface temperature (Waglan Island):        23.8 C 

Yesterday's (17 Nov 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                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
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 17 Nov
Last revision date: <18 Nov 2017> 

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