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

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9-day Weather Forecast | UV Index Forecast
Weather Information for South China Coastal Waters

Bulletin issued at 09:16 HKT 24/May/2017

At 9 a.m. at the Hong Kong Observatory the air temperature was 26 degrees Celsius and the relative humidity 98 per cent.
During the past hour the mean UV Index recorded at King's Park was 0.0. The intensity of UV radiation was low.

Please be reminded that:

The Red Rainstorm Warning Signal was issued at 9:15 a.m.
The Thunderstorm Warning has been issued. It will remain effective until 11:00 a.m. today. Squally thunderstorms are expected to occur over Hong Kong.

The air temperatures at other places were:

King's Park 25 degrees;
Wong Chuk Hang 26 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 25 degrees;
Tai Po 25 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 25 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 26 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 24 degrees;
Tsuen Wan Shing Mun Valley 25 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 25 degrees;
Kowloon City 25 degrees;
Happy Valley 26 degrees;
Wong Tai Sin 25 degrees;
Stanley 27 degrees;
Kwun Tong 25 degrees;
Sham Shui Po 25 degrees;
Kai Tak Runway Park 26 degrees;
Yuen Long Park 25 degrees;
Tai Mei Tuk 25 degrees.

Between 7:45 and 8:45 a.m., lightning was detected over all regions. The rainfall recorded in various regions were:

Kwai Tsing 39 to 78 mm;
Islands District 0 to 55 mm;
Tuen Mun 15 to 52 mm;
Sha Tin 12 to 48 mm;
Tsuen Wan 6 to 46 mm;
Sai Kung 4 to 44 mm;
Sham Shui Po 32 to 44 mm;
Kowloon City 26 to 43 mm;
Yau Tsim Mong 22 to 35 mm;
Kwun Tong 10 to 34 mm;
Wong Tai Sin 30 to 33 mm;
Yuen Long 0 to 27 mm;
Tai Po 7 to 25 mm;
Central & Western District 5 to 20 mm;
North District 3 to 15 mm;
Eastern District 4 to 14 mm;
Wan Chai 7 to 11 mm;
Southern District 0 to 5 mm.

Between midnight and 9 a.m. the minimum temperature was 25.2 degrees Celsius at the Hong Kong Observatory.


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


Climatological Information for 24 May


Local Weather Forecast
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Local Weather Forecast

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

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

Bulletin updated at 09:30 HKT 24/May/2017

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

The thundery showers associated with a trough of low pressure are affecting the coastal areas of Guangdong. Locally, more than 50 millimetres of rainfall were recorded over many places in the territory this morning, and rainfall even exceeded 100 millimetres in Kwai Tsing and Sham Shui Po.

Weather forecast for today

Cloudy to overcast with occasional heavy showers and squally thunderstorms. Moderate southerly winds, becoming northerlies gradually.

Outlook : Becoming fine gradually in the next few days.


(The above forecast period is valid up to 23:59 HKT today, 24/05/2017; 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 09:00 HKT 24/May/2017

N0 WARNING.

GENERAL SITUATION AT 232100 UTC:
TROUGH 22N 105E 22N 109E 29N 124E S 10KT.

MARINE FORECAST FOR 24 HOURS FROM 240100 UTC:

HONG KONG= S 4, BEC N 5. DOWN TO 1000 M IN OCNL HEAVY SHOWERS AND SQUALLY TS. SEA UP TO 2 M. TEMP 28-24 C. =
KWANGTUNG= S 4, BEC N 5. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
TAIWAN STRAIT= SW 4, BEC NE 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. =
BASHI= W TO NW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PRATAS= S TO SW 4-5, NE 5 LATER. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
BALINTANG= W TO SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
SCARBOROUGH= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
PARACEL= S TO SW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
TONKIN= NE 5, OCNL 6. ISOL SHOWERS AND TS. SEA 2 M. =
DANANG= S 4, BEC N 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

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

Bulletin issued at 09:30 HKT 24/May/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 24 May 2017

Weather Situation:
The thundery showers associated with a trough of low pressure are affecting the coastal waters of Guangdong.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
South force 4, becoming north force 5.
Occasional heavy showers and squally thunderstorms.
Moderate seas.

Nan'ao, Shanwei, South of Hong Kong and Shangchuan Dao:
South to southwest force 4, becoming north force 5.
Scattered showers and squally thunderstorms.
Moderate seas.

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

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

Waglan Island Wind southwest force 4
  Visibility 7 Kilometres

Shantou Wind southwest force 1
  Visibility 12 Kilometres

Dongsha Wind south-southwest force 1
  Visibility 10 Kilometres

Huangmaozhou Wind south force 3

Macau Wind south-southwest force 1
  Visibility 4200 Metres in rain

Xisha Wind south-southwest force 3
  Visibility 20 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 09:30 HKT 24/MAY/2017
(Next update at 17:30 HKT 24/MAY/2017)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE THUNDERY SHOWERS ASSOCIATED WITH A TROUGH OF
     LOW PRESSURE ARE AFFECTING THE COASTAL AREAS OF
     GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/5-10
                  BEC 360/10
                  TEMPO VRB/15G25 IN TS
       OFFSHORE:  180/10
                  BEC 360/10-15                        26-28
   B.   2000 FT:  180/10
                  BEC 360/10-15                        23
   C.   5000 FT:  240/10                               20
   D.  10000 FT:  260/10                               12
   E.  18000 FT:  280/15                               MS1
   F.  24000 FT:  280/20                               MS10
   G.  30000 FT:  280/20                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      CLOUDY TO OVERCAST WITH OCCASIONAL HEAVY
      SHOWERS AND SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1000 FT  SCT 2500 FT. 
      TEMPO FEW CB 800 FT  SCT 2000 FT BKN 8000 FT.
   K. VISIBILITY    : 7 KM. TEMPO 3500 M IN SHOWERS. 
                      TEMPO 1500 M IN TS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 11000 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS. MAINLY CLOUDY WITH A
     FEW 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 07:35 HKT on 24 May 17

VHHK SIGMET 3 VALID 232335/240335 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF N2154 AND W OF E11524 TOP FL400 MOV E 05KT 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 24/May/2017
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        85 - 99 Percent
Rainfall                                     4.1 mm 
Total rainfall since 1st January           260.2 mm
Against an average of                      547.1 mm

Other Stations                Min                  Max
King's Park                  24.4 C               29.6 C
Wong Chuk Hang               24.5 C               28.9 C
Ta Kwu Ling                  24.1 C               30.7 C
Lau Fau Shan                 23.9 C               30.9 C
Tai Po                       23.9 C               27.6 C
Sha Tin                      24.5 C               29.9 C
Tuen Mun                     24.7 C               30.9 C
Tseung Kwan O                24.3 C               27.7 C
Sai Kung                     24.6 C               28.0 C
Cheung Chau                  24.6 C               28.7 C
Chek Lap Kok                 24.9 C               32.0 C
Tsing Yi                     24.7 C               30.6 C
Shek Kong                    24.6 C               32.6 C
Tsuen Wan Ho Koon            23.9 C               30.1 C
Tsuen Wan Shing Mun Valley   24.5 C               30.4 C
Hong Kong Park               24.3 C               27.9 C
Shau Kei Wan                 24.3 C               27.2 C
Kowloon City                 24.2 C               29.5 C
Happy Valley                 25.0 C               30.2 C
Wong Tai Sin                 24.4 C               29.5 C
Stanley                      24.9 C               28.8 C
Kwun Tong                    24.7 C               29.6 C
Sham Shui Po                 24.7 C               31.0 C
Kai Tak Runway Park          25.2 C               28.1 C
Yuen Long Park               24.4 C               30.7 C
Tai Mei Tuk               23.9 C               28.7 C

Duration of sunshine (King's Park):              4.8 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):        25.4 C 

Yesterday's (23 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                         0.11
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 23 May
Last revision date: <24 May 2017> 

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