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Bulletin issued at 12:16 HKT 04/May/2017

At noon at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 94 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.1. The intensity of UV radiation was low.

Announcement on Localised Heavy Rain: More than 70 millimetres of rainfall were recorded in Tsuen Wan District in the past 1 hour ending at 10:20 a.m. and may cause serious flooding.

Though rainstorm warning has been cancelled, people should stay alert to the danger that may be brought about by river flooding.

Please be reminded that:

The Thunderstorm Warning has been issued. It will remain effective until 1:45 p.m. today. A few squally thunderstorms are expected to occur over Hong Kong.
The Special Announcement of Flooding in Northern New Territories has been issued.

The air temperatures at other places were:

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

Between 10:45 and 11:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Sai Kung 21 to 42 mm;
Kowloon City 24 to 37 mm;
Yau Tsim Mong 27 to 37 mm;
Kwun Tong 25 to 33 mm;
Central & Western District 13 to 28 mm;
Eastern District 19 to 26 mm;
Wong Tai Sin 19 to 25 mm;
Wan Chai 21 to 25 mm;
Tai Po 9 to 24 mm;
Southern District 12 to 23 mm;
Sha Tin 10 to 22 mm;
Sham Shui Po 15 to 21 mm;
Kwai Tsing 5 to 16 mm;
North District 4 to 15 mm;
Islands District 2 to 14 mm;
Tsuen Wan 0 to 14 mm;
Yuen Long 3 to 13 mm;
Tuen Mun 4 to 6 mm.

35.7 millimetres of rainfall were recorded at the Hong Kong Observatory between midnight last night and midday today.


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


Climatological Information for 4 May

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


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 12:10 HKT 04/May/2017

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

A band of thundery showers associated with a trough of low pressure is affecting the vicinity of the Pearl River Estuary. Locally, more than 30 millimetres were recorded over widespread areas, and rainfall even exceeded 70 millimetres over Tsuen Wan, Yuen Long and Sai Kung.

Weather forecast for this afternoon and tonight

Cloudy with showers and a few squally thunderstorms. Light to moderate southerly winds.

Outlook : Remaining showery tomorrow. Showers will ease off with sunny intervals over the weekend.


(The above forecast period is valid up to 23:59 HKT today, 04/05/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
Traditional Chinese Simplified Chinese

Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 09:00 HKT 04/May/2017

N0 WARNING.

GENERAL SITUATION AT 032100 UTC:
TROUGH 22N 108E 23N 113E 30N 118E SE SLOWLY.

MARINE FORECAST FOR 24 HOURS FROM 040100 UTC:

HONG KONG= S 4, OCNL 5. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. TEMP 29-23 C. =
KWANGTUNG= S TO SE 4, OCNL 5. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. =
TAIWAN STRAIT= S TO SW 4. ISOL SHOWERS. =
BASHI= E TO SE 4. ISOL SHOWERS. =
PRATAS= S TO SE 4. ISOL SHOWERS. =
BALINTANG= E TO SE 4. ISOL SHOWERS. =
SCARBOROUGH= E TO SE 4. ISOL SHOWERS. =
PARACEL= S TO SE 4, OCNL 5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= S TO SE 4-5. ISOL SHOWERS AND SQUALLY TS. SEA UP TO 2 M. =
DANANG= S TO 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.


  • Map showing the 10 forecast areas
  • Tidal Information

    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

    Current Weather | Local Weather Forecast | Regional Temperature Forecast in HK
    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 12:30 HKT 04/May/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 12:30 p.m. on 04 May 2017

    Weather Situation:
    A band of thundery showers associated with a trough of low pressure is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    South force 4, occasionally force 5.
    Isolated showers and squally thunderstorms.
    Moderate seas.

    Nan'ao and Shanwei:
    South to southeast force 4.
    Isolated showers and squally thunderstorms.
    Moderate seas.

    South of Hong Kong:
    South to southeast force 4, occasionally force 5.
    Isolated showers and squally thunderstorms.
    Moderate seas.

    Shangchuan Dao:
    South to southeast force 4 to 5.
    Isolated showers and squally thunderstorms.
    Moderate seas.

    Outlook for the next 48 hours
    South to southeasterly winds of force 4 to 5, becoming easterly winds of force 4 to 5 later. Isolated showers and thunderstorms.

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

    Waglan Island Wind west-northwest force 2
      Visibility 9 Kilometres

    Shantou Wind east-southeast force 2
      Visibility 12 Kilometres

    Huangmaozhou Wind northwest force 4

    Macau Wind west-southwest force 2
      Visibility 7 Kilometres in thunderstorms

    Xisha Wind south force 2
      Visibility 29 Kilometres

  • Explanation of Seas or Sea Waves
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  • Visibility Readings in Hong Kong Waters
  • Map showing forecast areas
  • Tidal Information

    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 09:00 HKT 04/MAY/2017
    (Next update at 17:30 HKT 04/MAY/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A BAND OF THUNDERY SHOWERS ASSOCIATED WITH A
     TROUGH OF LOW PRESSURE IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  160/5-10
                  TEMPO VRB/20G35 IN TS
       OFFSHORE:  160/10-15                            27-29
   B.   2000 FT:  170/10-15 OCNL 20                    22
   C.   5000 FT:  250/20                               18
   D.  10000 FT:  260/20                               10
   E.  18000 FT:  260/25                               MS3
   F.  24000 FT:  270/30                               MS15
   G.  30000 FT:  290/30                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY WITH SHOWERS. SHOWERS WILL BE FREQUENT
      AT TIMES WITH SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT. TEMPO FEW CB 800 FT
      SCT 2000 FT BKN 4000 FT
   K. VISIBILITY    : 9 KM.  TEMPO 3000 M IN SHOWERS. TEMPO 1500 IN TS
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 10000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.  MOD NEAR HILLS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 24 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE SOUTHERLY WINDS.  MAINLY CLOUDY WITH
     SHOWERS AND ISOLATED 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.

    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 08:55 HKT on 04 May 17

    VHHK SIGMET 1 VALID 040055/040455 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11130 - N2124 E11130 - N2230 E11342 - N2330 E11700 - N2142 E11700 - N2000 E11130 TOP FL420 MOV SE 15KT 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

    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 04/May/2017 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.3 C
Minimum Air Temperature                     25.6 C
Grass Minimum Temperature                   25.0 C
Relative Humidity                        66 - 89 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           134.5 mm
Against an average of                      368.7 mm

Other Stations                Min                  Max
King's Park                  25.3 C               31.2 C
Wong Chuk Hang               25.0 C               28.1 C
Ta Kwu Ling                  25.2 C               31.6 C
Lau Fau Shan                 25.2 C               30.8 C
Tai Po                       25.1 C               30.1 C
Sha Tin                      25.7 C               30.4 C
Tuen Mun                     25.5 C               29.7 C
Tseung Kwan O                24.7 C               30.1 C
Sai Kung                     24.9 C               27.6 C
Cheung Chau                  24.0 C               28.2 C
Chek Lap Kok                 26.0 C               30.1 C
Tsing Yi                     25.8 C               30.7 C
Shek Kong                    25.3 C               31.0 C
Tsuen Wan Ho Koon            24.4 C               28.7 C
Tsuen Wan Shing Mun Valley   25.2 C               30.0 C
Hong Kong Park               25.7 C               28.5 C
Shau Kei Wan                 24.1 C               29.5 C
Kowloon City                 25.2 C               30.6 C
Happy Valley                 26.2 C               30.4 C
Wong Tai Sin                 25.5 C               30.2 C
Stanley                      24.9 C               29.4 C
Kwun Tong                    25.4 C               30.0 C
Sham Shui Po                 26.0 C               31.2 C
Kai Tak Runway Park          25.1 C               28.7 C
Yuen Long Park               25.5 C               31.0 C
Tai Mei Tuk               24.9 C               29.9 C

Duration of sunshine (King's Park):              3.9 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.
 

Yesterday's (03 May 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                               0.09
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 03 May
     2003copy right image | Important notices | Privacy policy Last revision date: <04 May 2017> 

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