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

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

Bulletin issued at 16:02 HKT 21/Apr/2017

At 4 p.m. at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 83 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.

Gusts reaching 90 kilometres per hour or above may continue to affect Hong Kong.

Please be reminded that:

The Amber Rainstorm Warning Signal has been issued.
The Thunderstorm Warning has been issued. It will remain effective until 5:00 p.m. today. Squally thunderstorms are expected to occur over Hong Kong.

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 23 degrees;
Tai Po 27 degrees;
Sha Tin 28 degrees;
Tuen Mun 24 degrees;
Tseung Kwan O 27 degrees;
Sai Kung 28 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 23 degrees;
Tsing Yi 27 degrees;
Shek Kong 28 degrees;
Tsuen Wan Ho Koon 26 degrees;
Tsuen Wan Shing Mun Valley 27 degrees;
Hong Kong Park 27 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 27 degrees;
Wong Tai Sin 28 degrees;
Stanley 26 degrees;
Kwun Tong 28 degrees;
Sham Shui Po 27 degrees;
Kai Tak Runway Park 28 degrees;
Yuen Long Park 27 degrees;
Tai Mei Tuk 26 degrees.

Between 2:45 and 3:45 p.m., lightning was detected within Lantau, New Territories West, Hong Kong and Kowloon. The rainfall recorded in various regions were:

Tuen Mun 0 to 4 mm;
Tai Po 0 to 3 mm;
Sai Kung 0 to 1 mm;
Yuen Long 0 to 1 mm.


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


Climatological Information for 21 Apr


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 16:15 HKT 21/Apr/2017

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

An intense band of thundery showers is affecting the coastal areas of Guangdong. Meanwhile, a cold front over inland Guangdong will move across the coast tonight.

Weather forecast for tonight and tomorrow

Cloudy. Heavy showers and squally thunderstorms at first. Becoming moderate to fresh northerly winds overnight with temperatures falling appreciably to about 19 degrees. Bright periods tomorrow with a maximum temperature of around 24 degrees.

Outlook : Mainly cloudy in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 22/04/2017; 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 21/Apr/2017

N0 WARNING.

GENERAL SITUATION AT 202100 UTC:
A SOUTHERLY AIRSTREAM IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 210100 UTC:

HONG KONG= S 4-5, BEC N UP TO 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, BEC 3 M. TEMP 28-22 C. =
KWANGTUNG= S TO SW 4-5, BEC N 6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2 M, BEC 3 M. =
TAIWAN STRAIT= SW 5-6, BEC NE 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. =
BASHI= W TO SW 5-6 , N 6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS LATER. SEA 2-3 M. =
PRATAS= S TO SW 4-5, N 6 LATER. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS LATER. SEA 2 M, 3 M LATER. =
BALINTANG= SW 4-5. ISOL SHOWERS LATER. SEA UP TO 2 M. =
SCARBOROUGH= S TO SW 4-5. ISOL SHOWERS LATER. SEA UP TO 2 M. =
PARACEL= S 5-6, NW 6 IN N LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. =
TONKIN= S 5-6, BEC N 6-7. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M, 4 M LATER. =
DANANG= S 5-6, N 6 IN N LATER. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 3 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 16:30 HKT 21/Apr/2017

Weather information for south China coastal waters issued by the Hong Kong Observatory at 4:30 p.m. on 21 April 2017

Warnings:
Strong winds in all areas.

Weather Situation:
A cold front over the northern part of Guangdong is moving southwards gradually. The associated thundery showers are affecting the coastal waters of Guangdong.

Area forecasts for the next 24 hours

Hong Kong Adjacent Waters:
South force 5 to 6, becoming north up to force 6.
Isolated squally showers and thunderstorms. Showers will be heavy at times.
Moderate to rough seas.

Nan'ao and Shanwei:
Southwest force 5 to 6, becoming north force 6.
Scattered squally showers and thunderstorms.
Moderate to rough seas.

South of Hong Kong:
South to southwest force 5 to 6, becoming north force 6.
Isolated squally showers and thunderstorms.
Moderate to rough seas.

Shangchuan Dao:
South force 5 to 6, becoming north force 6.
Isolated squally showers and thunderstorms.
Moderate to rough seas.

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

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

Waglan Island Wind southwest force 5
  Visibility 7 Kilometres

Shantou Wind south force 2
  Visibility 30 Kilometres

Dongsha Wind southwest force 3
  Visibility 10 Kilometres

Huangmaozhou Wind west-southwest force 4

Xisha Wind south-southwest force 4
  Visibility 19 Kilometres


WEATHER FORECAST FOR LOCAL AVIATION
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Weather Forecast for Local Aviation

Bulletin issued at 09:30 HKT 21/APR/2017
(Next update at 17:30 HKT 21/APR/2017)
I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     A SOUTHERLY AIRSTREAM IS AFFECTING THE COASTAL
     WATERS OF GUANGDONG. MEANWHILE, PRESSURE IS
     RISING OVER CENTRAL CHINA. A COLD FRONT IS
     EXPECTED TO REACH THE COASTAL AREAS OF GUANGDONG
     OVERNIGHT.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1000 TO 2000 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  180/10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  160/15-20                            26-28
   B.   2000 FT:  220/20                               22
   C.   5000 FT:  230/20                               18
   D.  10000 FT:  250/30                               9
   E.  18000 FT:  250/45                               MS6
   F.  24000 FT:  260/45                               MS16
   G.  30000 FT:  260/60                               MS29
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS. 
      ISOLATED SQUALLY THUNDERSTORMS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 1200 FT  SCT 2500 FT.  
      TEMPO FEW CB 800 FT SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS.  
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 15000 FT      10 DEG. C LEVEL(S) : 9400 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 23 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHERLY WINDS. CLOUDY WITH A
     FEW SHOWERS AND ISOLATED SQUALLY 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 14:50 HKT on 21 Apr 17

VHHK SIGMET 1 VALID 210650/211050 VHHH- VHHK HONG KONG FIR EMBD TS FCST N OF LINE N2242 E11730 - N2036 E11130 TOP FL380 MOV ESE 10KT 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: <18 Apr 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 21/Apr/2017
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     27.5 C
Minimum Air Temperature                     25.1 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        78 - 93 Percent
Rainfall                                     3.1 mm 
Total rainfall since 1st January           101.4 mm
Against an average of                      277.4 mm

Other Stations                Min                  Max
King's Park                  24.6 C               27.7 C
Wong Chuk Hang               23.6 C               25.7 C
Ta Kwu Ling                  23.8 C               29.4 C
Lau Fau Shan                 23.7 C               28.8 C
Tai Po                       23.8 C               28.3 C
Sha Tin                      24.8 C               28.3 C
Tuen Mun                     24.0 C               28.0 C
Tseung Kwan O                23.5 C               27.3 C
Sai Kung                     24.3 C               26.8 C
Cheung Chau                  23.5 C               26.2 C
Chek Lap Kok                 24.5 C               29.0 C
Tsing Yi                     24.3 C               27.7 C
Shek Kong                    24.1 C               29.4 C
Tsuen Wan Ho Koon            23.5 C               25.3 C
Tsuen Wan Shing Mun Valley   24.4 C               27.4 C
Hong Kong Park               24.4 C               27.0 C
Shau Kei Wan                 23.4 C               26.8 C
Kowloon City                 24.1 C               27.5 C
Happy Valley                 24.8 C               27.5 C
Wong Tai Sin                 24.7 C               27.8 C
Stanley                      23.7 C               26.2 C
Kwun Tong                    24.4 C               27.4 C
Sham Shui Po                 24.6 C               28.4 C
Kai Tak Runway Park          24.6 C               27.0 C
Yuen Long Park               24.0 C               29.2 C
Tai Mei Tuk               23.6 C               28.3 C

Duration of sunshine (King's Park):              1.2 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
 

Yesterday's (20 Apr 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                             0.09
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 20 Apr
Last revision date: <21 Apr 2017> 

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