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Bulletin issued at 05:02 HKT 04/Jun/2018

At 5 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 93 per cent.

The air temperatures at other places were:

King's Park 27 degrees;
Wong Chuk Hang 27 degrees;
Ta Kwu Ling 27 degrees;
Lau Fau Shan 26 degrees;
Tai Po 27 degrees;
Sha Tin 27 degrees;
Tuen Mun 27 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 27 degrees;
Cheung Chau 27 degrees;
Chek Lap Kok 29 degrees;
Tsing Yi 26 degrees;
Shek Kong 27 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 26 degrees;
Hong Kong Park 26 degrees;
Shau Kei Wan 26 degrees;
Kowloon City 26 degrees;
Happy Valley 28 degrees;
Wong Tai Sin 27 degrees;
Stanley 28 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 26 degrees.

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

Tsuen Wan 1 to 20 mm;
Yuen Long 0 to 9 mm;
Kwai Tsing 3 to 9 mm;
Sham Shui Po 5 to 8 mm;
Tuen Mun 0 to 6 mm;
Eastern District 0 to 5 mm;
Sha Tin 0 to 4 mm;
Yau Tsim Mong 2 to 3 mm;
Sai Kung 0 to 2 mm;
Kowloon City 1 to 2 mm;
Wong Tai Sin 0 to 1 mm;
Tai Po 0 to 1 mm;
Wan Chai 1 mm;
Central & Western District 0 to 1 mm;
Kwun Tong 0 to 1 mm.

Here is the information on Tropical Depression at 5 a.m.:
Location: 15.7 degrees north, 110.6 degrees east.

Note:

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

Climatological Information for 4 Jun

Local Weather Forecast

Current Weather | Regional Temperature Forecast in HK |  9-day Weather Forecast
UV Index Forecast |  Weather Information for South China Coastal Waters

Bulletin updated at 04:45 HKT 04/Jun/2018

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

An easterly airstream is affecting the coast of Guangdong. Meanwhile, showers are affecting the region. Locally, showers brought more than 5 millimetres of rainfall to many places this morning.

At 5 a.m., the tropical depression over the central part of the South China Sea was centred about 220 kilometres southwest of Xisha. It is forecast to move north at about 10 kilometres per hour towards the vicinity of Hainan Island.

Weather forecast for today

Mainly cloudy with a few showers. Hot with sunny intervals during the day. The maximum temperature will be about 32 degrees. Moderate easterly winds, occasionally fresh offshore.

Outlook : There will be squally showers and thunderstorms in the next couple of days.

(The above forecast period is valid up to 23:59 HKT today, 04/06/2018; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

Marine Forecast

Weather Forecast for Local Aviation

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 :
     AN EASTERLY AIRSTREAM IS AFFECTING THE COAST OF
     GUANGDONG.
     AT 11 P.M., THE TROPICAL DEPRESSION OVER THE
     CENTRAL PART OF THE SOUTH CHINA SEA WAS LOCATED
     AT 15.3 DEGREES NORTH, 110.8 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTH AT ABOUT 5 KNOTS TOWARDS
     THE VICINITY OF HAINAN ISLAND.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  100/10-15
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  100/15-20, OCNL 25                   26-32
   B.   2000 FT:  100/20-25                            23
   C.   5000 FT:  100/15                               19
   D.  10000 FT:  110/10                               12
   E.  18000 FT:  140/10                               MS1
   F.  24000 FT:  180/15                               MS11
   G.  30000 FT:  240/10                               MS23
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY CLOUDY AT NIGHT,  SUNNY INTERVAL DURING
      THE DAY.  THERE WILL BE A FEW ISOLATED SHOWERS
      AND SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 6000 FT TEMPO FEW CB 1500 FT
      SCT 2500 FT BKN 4000 FT.
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. TEMPO 2500 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11400 FT
   M. TURBULENCE    : MOD TO SEV
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE EASTERLY WINDS, OCNL FRESH OFFSHORE.
     MAINLY CLOUDY WITH ISOLATED SHOWERS.=

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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.