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Bulletin updated at 17:45 HKT 19/Apr/2018

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

An easterly airstream is affecting the coast of Guangdong. Meanwhile, a band of clouds is covering the region.

Weather forecast for tonight and tomorrow

Mainly cloudy. One or two showers tomorrow. Bright periods during the day. Temperatures will range between 22 and 26 degrees. Moderate easterly winds.

Outlook : Hot with sunny periods in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 20/04/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 17:30 HKT 19/APR/2018
(Next update at 01:30 HKT 20/APR/2018)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AN EASTERLY AIRSTREAM IS AFFECTING THE COAST OF
     GUANGDONG. MEANWHILE, A BAND OF CLOUDS IS
     COVERING THE REGION.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  090/10
       OFFSHORE:  090/15-20                            26-23
   B.   2000 FT:  120/10-15                            17
   C.   5000 FT:  160/10                               14
   D.  10000 FT:  220/15                               7
   E.  18000 FT:  240/25                               MS6
   F.  24000 FT:  250/40                               MS19
   G.  30000 FT:  270/45                               MS30
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY. ISOLATED SHOWERS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3000 FT
   K. VISIBILITY    : 9 KM. TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 14500 FT      10 DEG. C LEVEL(S) : 7400 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, OCCASIONALLY FRESH
     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 13:35 HKT on 15 Apr 18

VHHK SIGMET 3 VALID 150345/150745 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2000 E11130 - N2124 E11130 - N2230 E11342 - N2336 E11712 - N2242 E11712 - N2000 E11130 - N2000 E11130 TOP FL400 MOV NE 15KT NC= VHHK SIGMET 5 VALID 150535/150935 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2248 E11442 - N2342 E11730 - N2248 E11730 - N2154 E11442 - N2248 E11442 TOP FL400 MOV NE 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.

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 19/Apr/2018 
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     25.6 C
Minimum Air Temperature                     21.1 C
Grass Minimum Temperature                   20.3 C
Relative Humidity                        68 - 86 Percent
Rainfall                                     0.1 mm 
Total rainfall since 1st January           108.9 mm
Against an average of                      260.5 mm

Other Stations                Min                  Max
King's Park                  20.5 C               24.9 C
Wong Chuk Hang               20.4 C               24.9 C
Ta Kwu Ling                  20.2 C               25.9 C
Lau Fau Shan                 19.0 C               25.7 C
Tai Po                       20.4 C               23.6 C
Sha Tin                      20.2 C               25.3 C
Tuen Mun                     19.8 C               25.3 C
Tseung Kwan O                18.8 C               24.2 C
Sai Kung                     20.0 C               23.4 C
Cheung Chau                  20.0 C               24.8 C
Chek Lap Kok                 21.3 C               26.5 C
Tsing Yi                     21.2 C               25.2 C
Shek Kong                    19.3 C               26.3 C
Tsuen Wan Ho Koon            18.5 C               24.6 C
Tsuen Wan Shing Mun Valley   19.4 C               24.8 C
Hong Kong Park               20.5 C               24.2 C
Shau Kei Wan                 19.9 C               23.6 C
Kowloon City                 20.1 C               25.5 C
Happy Valley                 20.8 C               25.5 C
Wong Tai Sin                 20.3 C               25.0 C
Stanley                      20.4 C               23.9 C
Kwun Tong                    20.2 C               23.7 C
Sham Shui Po                 20.7 C               25.4 C
Kai Tak Runway Park          20.8 C               23.9 C
Yuen Long Park               19.1 C               25.8 C
Tai Mei Tuk               20.2 C               25.1 C

Duration of sunshine (King's Park):              3.1 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 9.
Sea surface temperature (Waglan Island):        22.5 C 

Yesterday's (18 Apr 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                               0.10
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 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 18 Apr
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