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Bulletin issued at 03:02 HKT 04/May/2018

At 3 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 88 per cent.

Please be reminded that:

The Strong Monsoon Signal has been issued.

The air temperatures at other places were:

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

Between 1:45 and 2:45 a.m., the rainfall recorded in various regions were:

Tai Po 0 to 15 mm;
Kowloon City 0 to 1 mm;
North District 0 to 1 mm;
Sai Kung 0 to 1 mm;
Eastern District 0 to 1 mm;
Sha Tin 0 to 1 mm;
Yuen Long 0 to 1 mm;
Southern District 0 to 1 mm;
Kwun Tong 0 to 1 mm.


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


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Bulletin updated at 02:45 HKT 04/May/2018

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

A strong easterly airstream is affecting the coast of Guangdong.

Weather forecast for today

Mainly cloudy. A few rain patches at first. Temperatures will range between 22 and 25 degrees. Fresh easterly winds, strong offshore at first.

Outlook : Sunny periods over the weekend. The weather will be unsettled with showers next week.


(The above forecast period is valid up to 23:59 HKT today, 04/05/2018; 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 21:00 HKT 03/May/2018

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

GENERAL SITUATION AT 030900 UTC:
AN EASTERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 031300 UTC:

HONG KONG= E 6-7. A FEW SHOWERS. SEA 3-4 M. SWELL E TO NE UP TO 2 M. TEMP 23-26 C. =
KWANGTUNG= E 6-7, OCNL 8. ISOL SHOWERS. SEA UP TO 6 M. SWELL E TO NE 2 M. =
TAIWAN STRAIT= NE 7, 8 AT FIRST. ISOL SHOWERS. SEA 4 M, 6 M AT FIRST. SWELL NE 3 M. =
BASHI= E TO NE 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 2-3 M. =
PRATAS= E 6-7, OCNL 8. ISOL SHOWERS. SEA UP TO 6 M. SWELL NE 2 M. =
BALINTANG= E 7-8. ISOL SHOWERS. SEA 4-6 M. SWELL NE 2-3 M. =
SCARBOROUGH= E TO NE 5-6. ISOL SHOWERS. SEA 2-3 M. SWELL NE 2 M. =
PARACEL= E 5-6, OCNL 7. ISOL SHOWERS. SEA UP TO 4 M. SWELL E TO NE 2 M. =
TONKIN= SE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= E TO SE 4-5. ISOL SHOWERS. 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

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    9-day Weather Forecast | UV Index Forecast | Weather Information for Fishermen

    Bulletin issued at 03:30 HKT 04/May/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 3:30 a.m. on 04 May 2018

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

    Weather Situation:
    An easterly airstream is affecting the south China coastal waters.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East force 6 to 7, occasionally force 8.
    A few rain patches.
    Rough to very rough seas.

    Nan'ao, Shanwei and South of Hong Kong:
    East force 6 to 7, occasionally force 8.
    Rough to very rough seas.

    Shangchuan Dao:
    East force 6 to 7.
    Rough seas.

    Outlook for the next 48 hours
    Southeasterly winds of force 5 to 6.

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

    Waglan Island Wind northeast force 5
      Visibility 14 Kilometres

    Shantou Wind northeast force 1
      Visibility 20 Kilometres

    Huangmaozhou Wind east force 7

    Macau Wind east force 4
      Visibility 12 Kilometres

    Xisha Wind east-northeast force 2
      Visibility 29 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 04/MAY/2018
    (Next update at 9:00-9:30 HKT 04/MAY/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB. 
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A FRESH TO STRONG EASTERLY AIRSTREAM IS AFFECTING THE COAST
     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, OCNL 20
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  090/20-25, OCNL 30                   22-27
   B.   2000 FT:  100/20-25, OCNL 30                   20
   C.   5000 FT:  140/15                               18
   D.  10000 FT:  220/10                               10
   E.  18000 FT:  240/15                               MS3
   F.  24000 FT:  240/25                               MS13
   G.  30000 FT:  260/25                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      2900-3700 FT.
   I. WEATHER       : 
      MAINLY CLOUDY WITH ISOLATED SHOWERS. A FEW THUNDERSTORMS
      OVER INLAND AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1500 FT  SCT 2500 FT
      TEMPO  FEW CB 800 FT  SCT 1500 FT  BKN 4000 FT.
   K. VISIBILITY    : 8 KM. TEMPO 4000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16000 FT      10 DEG. C LEVEL(S) : 9800 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS AND AT LOW LEVELS.
   N. SEA STATE     : 2.5-3.5 M     SEA TEMPERATURE    : 26 DEG
IV.  FURTHER OUTLOOK: 
     FRESH EASTERLY WINDS, OCCASIONALLY STRONG OFFSHORE.
     MAINLY CLOUDY WITH A FEW ISOLATED 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 21:45 HKT on 03 May 18

    VHHK SIGMET 1 VALID 031345/031745 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N2200 AND E OF E11430 AND W OF E11630 TOP FL400 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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    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/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     33.5 C
Minimum Air Temperature                     22.9 C
Grass Minimum Temperature                   23.0 C
Relative Humidity                        56 - 91 Percent
Rainfall                                     1.9 mm 
Total rainfall since 1st January           119.4 mm
Against an average of                      368.7 mm

Other Stations                Min                  Max
King's Park                  22.2 C               33.0 C
Wong Chuk Hang               22.4 C               32.1 C
Ta Kwu Ling                  21.2 C               33.7 C
Tai Po                       21.9 C               31.2 C
Sha Tin                      22.8 C               32.5 C
Tuen Mun                     23.6 C               33.3 C
Tseung Kwan O                21.9 C               32.9 C
Sai Kung                     22.2 C               31.7 C
Cheung Chau                  22.8 C               31.6 C
Chek Lap Kok                 23.9 C               32.4 C
Tsing Yi                     23.5 C               33.1 C
Shek Kong                    23.1 C               33.0 C
Tsuen Wan Ho Koon            22.0 C               30.1 C
Tsuen Wan Shing Mun Valley   22.7 C               32.7 C
Hong Kong Park               22.0 C               33.4 C
Shau Kei Wan                 21.8 C               32.1 C
Kowloon City                 22.3 C               33.0 C
Happy Valley                 22.7 C               32.4 C
Wong Tai Sin                 22.1 C               32.6 C
Stanley                      22.2 C               31.4 C
Kwun Tong                    22.0 C               32.7 C
Sham Shui Po                 23.4 C               32.9 C
Kai Tak Runway Park          22.8 C               31.7 C
Yuen Long Park               23.9 C               34.0 C
Tai Mei Tuk               21.4 C               33.6 C

Duration of sunshine (King's Park):              7.0 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.
Sea surface temperature (Waglan Island):        23.8 C 

Yesterday's (03 May 2018) 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                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.15
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 in the
past, the hourly mean ambient gamma radiation dose rate may
vary between 0.06 and 0.3 microsievert per hour. (1
microsievert = 0.000001 sievert = 0.001 millisievert)

    2. Temporal variations are generally caused by changes in
meteorological conditions such as rainfall, wind and
barometric pressure.

    3. Spatial variations are generally caused by differences in
the radioactive content of local rock and soil.

    4. The data displayed is provisional. Only limited data
validation has been carried out.
    Climatological Information for 03 May
     2003copy right image | Important notices | Privacy policy Last revision date: <04 May 2018> 

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