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

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Weather Information for South China Coastal Waters

Bulletin issued at 05:02 HKT 21/May/2017

At 5 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 91 per cent.

The air temperatures at other places were:

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

Between 3:45 and 4:45 a.m., the rainfall recorded in various regions were:

Sai Kung 0 to 1 mm.


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


Climatological Information for 21 May


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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UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 04:45 HKT 21/May/2017

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

Showers associated with a trough of low pressure is affecting the northern part of the South China Sea and the coast of Guangdong.

Weather forecast for today

Cloudy with a few showers. The maximum temperature will be about 26 degrees. Moderate to fresh easterly winds.

Outlook : Brighter in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 21/05/2017; 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 20/May/2017

N0 WARNING.

GENERAL SITUATION AT 200900 UTC:
TROUGH 20N 110E 19N 115E 21N 130E QSTNR.

MARINE FORECAST FOR 24 HOURS FROM 201300 UTC:

HONG KONG= E 5-6. A FEW SHOWERS. SEA 2-3 M. TEMP 24-27 C. =
KWANGTUNG= E TO SE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL E UP TO 2 M. =
TAIWAN STRAIT= NE 5-6. ISOL SHOWERS. SEA 2-3 M. SWELL NE UP TO 2 M. =
BASHI= E TO NE 5-6, OCNL 7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
PRATAS= E 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
BALINTANG= N 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2 M. =
SCARBOROUGH= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL NE UP TO 2 M. =
PARACEL= S TO SE 4-5, UP TO 6 IN N. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 M. SWELL NE UP TO 2 M. =
TONKIN= SE 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SE 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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9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

Bulletin issued at 05:30 HKT 21/May/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 21 May 2017

Warnings:
Strong winds in all areas.

Weather Situation:
A trough of low pressure is affecting the coastal waters of Guangdong.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
East force 5 to 6, occasionally force 7.
Isolated showers and thunderstorms.
Moderate to rough seas.

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

South of Hong Kong:
East to southeast force 5 to 6, occasionally force 7.
Isolated showers and thunderstorms.
Moderate to rough seas.

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

Outlook for the next 48 hours
East to southeasterly winds of force 5 to 6. Isolated showers and thunderstorms.

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

Waglan Island Wind east force 5
  Visibility 13 Kilometres

Shantou Wind east force 1
  Visibility 21 Kilometres

Dongsha Wind east force 3
  Visibility 8 Kilometres in rain

Huangmaozhou Wind east-northeast force 6

Macau Wind east force 3
  Visibility 10 Kilometres

Xisha Wind south-southwest force 2
  Visibility 30 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 01:30 HKT 21/MAY/2017
(Next update at 9:00-9:30 HKT 21/MAY/2017)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM PERSISTS OVER THE COASTAL
     AREAS OF GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10-15
       OFFSHORE:  090/15-20, OCNL 25                   23-27
   B.   2000 FT:  110/20-25, OCNL 30                   20
   C.   5000 FT:  130/10                               18
   D.  10000 FT:  250/10                               10
   E.  18000 FT:  260/15                               MS4
   F.  24000 FT:  300/25                               MS14
   G.  30000 FT:  300/30                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2000 FT  BKN 6000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 3000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH EASTERLY WINDS, OCCASIONALLY
     STRONG OFFSHORE.  CLOUDY WITH A FEW SHOWERS.=
===================================================================
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 03:00 HKT on 21 May 17

VHHK SIGMET 1 VALID 201630/202030 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1848 E11206 - N1930 E11130 - N2024 E11130 - N2018 E11218 - N1918 E11242 - N1848 E11206 TOP FL450 STNR NC= VHHK SIGMET 2 VALID 201900/202300 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1812 E11242 - N1930 E11130 - N2100 E11130 - N2100 E11212 - N1912 E11348 - N1812 E11242 TOP FL420 STNR 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: <06 May 2017> 

TROPICAL CYCLONE WARNING FOR SHIPPING
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Tropical Cyclone Warning for Shipping

There is no tropical cyclone warning for shipping*.




*Tropical cyclone warnings for shipping are issued by the Hong Kong Observatory for tropical cyclones located within the area bounded by 105E and 125E , 10N and 30N.




For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.


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 21/May/2017
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     24.8 C
Minimum Air Temperature                     22.7 C
Grass Minimum Temperature                   24.0 C
Relative Humidity                        85 - 91 Percent
Rainfall                                     0.3 mm 
Total rainfall since 1st January           246.1 mm
Against an average of                      519.5 mm

Other Stations                Min                  Max
King's Park                  22.1 C               24.9 C
Wong Chuk Hang               22.4 C               24.8 C
Ta Kwu Ling                  21.8 C               25.4 C
Lau Fau Shan                 22.1 C               26.2 C
Tai Po                       21.9 C               24.4 C
Sha Tin                      22.3 C               24.6 C
Tuen Mun                     22.4 C               25.7 C
Tseung Kwan O                21.7 C               23.9 C
Sai Kung                     22.0 C               24.4 C
Cheung Chau                  22.1 C               24.8 C
Chek Lap Kok                 23.3 C               27.3 C
Tsing Yi                     23.0 C               25.8 C
Shek Kong                    22.5 C               25.4 C
Tsuen Wan Ho Koon            21.7 C               25.3 C
Tsuen Wan Shing Mun Valley   22.3 C               25.3 C
Hong Kong Park               22.3 C               24.6 C
Shau Kei Wan                 21.6 C               23.8 C
Kowloon City                 21.7 C               25.2 C
Happy Valley                 22.4 C               24.8 C
Wong Tai Sin                 22.2 C               25.6 C
Stanley                      22.1 C               24.2 C
Kwun Tong                    22.1 C               24.8 C
Sham Shui Po                 22.6 C               26.0 C
Kai Tak Runway Park          22.4 C               24.7 C
Yuen Long Park               22.3 C               25.5 C
Tai Mei Tuk               21.6 C               24.1 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
Sea surface temperature (Waglan Island):        25.6 C 

Yesterday's (20 May 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                           0.08
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                        0.15

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 20 May
Last revision date: <21 May 2017> 

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