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Bulletin issued at 21:02 HKT 28/Sep/2016

At 9 p.m. at the Hong Kong Observatory the air temperature was 30 degrees Celsius and the relative humidity 57 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.

The air temperatures at other places were:

King's Park 30 degrees;
Wong Chuk Hang 31 degrees;
Ta Kwu Ling 30 degrees;
Lau Fau Shan 29 degrees;
Tai Po 30 degrees;
Sha Tin 30 degrees;
Tuen Mun 30 degrees;
Tseung Kwan O 28 degrees;
Sai Kung 31 degrees;
Cheung Chau 29 degrees;
Chek Lap Kok 30 degrees;
Tsing Yi 30 degrees;
Shek Kong 29 degrees;
Tsuen Wan Ho Koon 29 degrees;
Tsuen Wan Shing Mun Valley 29 degrees;
Hong Kong Park 30 degrees;
Shau Kei Wan 30 degrees;
Kowloon City 29 degrees;
Happy Valley 31 degrees;
Wong Tai Sin 30 degrees;
Stanley 30 degrees;
Kwun Tong 30 degrees;
Sham Shui Po 31 degrees;
Kai Tak Runway Park 31 degrees;
Yuen Long Park 30 degrees.

Here is the information on Tropical Storm Megi:
Location: 25.4 degrees north, 116.3 degrees east; Maximum sustained wind near its centre: 65 km/h.


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


Climatological Information for 28 Sep

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 20:45 HKT 28/Sep/2016

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

Weather forecast for tonight and tomorrow

Mainly cloudy with a few showers. Becoming cooler tomorrow. Temperatures will fall from about 29 degrees at first to around 24 degrees tomorrow night. Moderate to fresh northwesterly winds, occasionally strong offshore and on high ground at first.

Outlook : Slightly cooler with a few showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT tomorrow, 29/09/2016; 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 28/Sep/2016

GALE WARNING AREAS: KWANGTUNG AND TAIWAN STRAIT.

GENERAL SITUATION AT 280900 UTC:
FOR DETAILS ON TROPICAL STORM MEGI (1617), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 281300 UTC:

HONG KONG= NW 4-5, UP TO 6 AT FIRST. ISOL SHOWERS. SEA 2 M. TEMP 24-29 C. =
KWANGTUNG= NW 5-6, SW 7-8 IN E AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS IN E. SEA 2-3 M, UP TO 6 M IN E AT FIRST. SWELL SW 2 M. =
TAIWAN STRAIT= S TO SW 6-7, UP TO 8 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M AT FIRST. SWELL SW 2-3 M. =
BASHI= S TO SW 5-6, OCNL 7 AT FIRST. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3 M. SWELL SW 2-3 M. =
PRATAS= W TO SW 5-6. ISOL SHOWERS AND TS. SEA 2-3 M. SWELL SW 2 M. =
BALINTANG= S TO SW 5-6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL SW 2-3 M. =
SCARBOROUGH= SW 4-5. OCNL 6. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 2 M. SWELL SW 2 M. =
PARACEL= SW 4-5. ISOL SHOWERS AND TS. SEA UP TO 2 M. =
TONKIN= N TO NW 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= NW 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.


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    • 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 19:30 HKT 28/Sep/2016

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 7:30 p.m. on 28 September 2016

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

    Weather Situation:
    At 7 p.m., Tropical Storm Megi with maximum sustained winds of about 75 kilometres per hour near its centre was located at 25.2 degrees north, 116.4 degrees east. It is forecast to move northwest at about 12 kilometres per hour across the inland areas of Fujian and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northwest force 4 to 5, up to force 6 at first.
    A few showers.
    Moderate to rough seas.

    Nan'ao:
    Southwest force 7 to 8, force 5 to 6 later.
    Occasional squally showers and thunderstorms.
    Very rough seas, becoming moderate to rough later.

    Shanwei:
    Southwest force 7 to 8, becoming northwest force 5 to 6 later.
    Scattered squally showers and thunderstorms.
    Very rough seas, becoming moderate to rough later.

    South of Hong Kong:
    Northwest force 4 to 5, up to force 6 at first.
    Moderate to rough seas.

    Shangchuan Dao:
    Northwest force 4 to 5.
    Moderate seas.

    Outlook for the next 48 hours
    North to northeasterly winds of force 5 to 6, southwesterly winds of force 5 to 6 in east at first. Isolated showers and thunderstorms.

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

    Waglan Island Wind west-northwest force 4
      Visibility 18 Kilometres

    Shantou Wind west-southwest force 3
      Visibility 15 Kilometres in showers

    Huangmaozhou Wind west-northwest force 4

    Macau Wind west-northwest force 3
      Visibility 9 Kilometres

    Xisha Wind west-southwest force 3
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
    Traditional Chinese Simplified Chinese

    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 28/SEP/2016
    (Next update at 01:30 HKT 29/SEP/2016)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS, SEV TURB AND SEV GUSTS.

II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., TROPICAL STORM MEGI WAS CENTRED NEAR
     25.1 DEGREES NORTH 116.5 DEGREES EAST AND IS
     FORECAST TO MOVE WEST-NORTHWEST AT ABOUT 8 KNOTS
     ACROSS THE INLAND AREAS OF FUJIAN AND WEAKEN
     GRADUALLY.

III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  320/10-15
       OFFSHORE:  320/15-20, OCNL 25                   32-27
   B.   2000 FT:  320/20-25                            26-23
   C.   5000 FT:  350/25                               21
   D.  10000 FT:  330/20                               12
   E.  18000 FT:  330/35                               MS2
   F.  24000 FT:  350/30                               MS10
   G.  30000 FT:  330/20                               MS24
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      4500 - 5000 FT.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT SCT 4000 FT.
   K. VISIBILITY    : 9 KM.  TEMPO 4000 M IN SHOWERS.
   L. 0 DEG. C LEVEL: 17500 FT      10 DEG. C LEVEL(S) : 12200 FT
   M. TURBULENCE    : MOD TO SEV.
   N. SEA STATE     : 2.0-3.0 M     SEA TEMPERATURE    : 29 DEG

IV.  FURTHER OUTLOOK: 
     MODERATE TO FRESH NORTHWESTERLY WINDS,
     OCCASIONALLY STRONG OFFSHORE AND ON HIGH GROUND
     AT FIRST.  MAINLY CLOUDY WITH A FEW 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 14:03 HKT on 28 Sep 16

    VHHK SIGMET 2 VALID 280605/281005 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2248 E11442 - N2342 E11730 - N2136 E11730 - N2130 E11448 - N2248 E11442 TOP FL420 MOV SSE 10KT NC=

    Please click here for more about the SIGMET

    TROPICAL CYCLONE WARNING Skip to main content
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    Tropical Cyclone Warnings

    Bulletin issued at 20:45 HKT 28/Sep/2016

    Tropical Cyclone Bulletin

    Here is the latest Tropical Cyclone Bulletin issued by the Hong Kong Observatory.

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone now centred within about 800 kilometres of Hong Kong may affect us.

    At 9 p.m., Tropical Storm Megi was estimated to be about 410 kilometres north-northeast of Hong Kong (near 25.4 degrees north 116.3 degrees east) and is forecast to move northwest at about 12 kilometres per hour across the inland areas of Fujian and weaken gradually.

    With Megi gradually moving away from Hong Kong and further weakening, its threat to Hong Kong has diminished significantly. The Observatory will cancel all Tropical Cyclone Warning Signals shortly.

    The northeast monsoon is expected to reach the South China coastal areas. The Observatory will then consider issuing the Strong Monsoon Signal depending on local wind conditions.

    (Precautionary Announcements with No. 1 Signal)

    1. Listen to radio, watch TV or browse the Hong Kong Observatory's web site for information on the tropical cyclone.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

    Tropical Cyclone Warning |  Track and Positions of Tropical Cyclones
    Current Weather |  Local Weather Forecast |  9-day Weather Forecast
    South China Coastal Waters |  Marine Forecast
    Severe Weather Information Centre

    Bulletin issued at 21:30 HKT 28/Sep/2016


    Tropical Cyclone Warning

    At 281200 UTC, Tropical Storm Megi (1617) with central pressure 994 hectopascals was centred within 60 nautical miles of two five point four degrees north (25.4 N) one one six point three degrees east (116.3 E) and is forecast to weaken and move northwest at about 6 knots for the next 12 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 60 nautical miles.
    Radius of over 2 metre waves 210 nautical miles.

    No further warnings on this Tropical Storm will be issued by the Hong Kong Observatory unless re-intensification takes place.

    Forecast position and intensity at 290000 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    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 28/Sep/2016 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     34.9 C
Minimum Air Temperature                     27.7 C
Grass Minimum Temperature                   26.7 C
Relative Humidity                        48 - 93 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2263.8 mm
Against an average of                     2212.4 mm

Other Stations                Min                  Max
King's Park                  27.2 C               34.9 C
Wong Chuk Hang               26.4 C               35.4 C
Ta Kwu Ling                  24.8 C               35.8 C
Lau Fau Shan                 26.6 C               34.1 C
Tai Po                       26.7 C               34.3 C
Sha Tin                      25.6 C               35.4 C
Tuen Mun                     26.8 C               34.9 C
Tseung Kwan O                25.6 C               35.8 C
Sai Kung                     26.9 C               34.6 C
Cheung Chau                  26.7 C               34.9 C
Chek Lap Kok                 28.0 C               35.3 C
Tsing Yi                     26.1 C               35.2 C
Shek Kong                    25.7 C               35.7 C
Tsuen Wan Ho Koon            25.1 C               33.5 C
Tsuen Wan Shing Mun Valley   25.3 C               35.7 C
Hong Kong Park               26.5 C               34.6 C
Shau Kei Wan                 27.9 C               34.9 C
Kowloon City                 26.9 C               35.8 C
Happy Valley                 26.3 C               36.5 C
Wong Tai Sin                 26.2 C               36.1 C
Stanley                      27.1 C               34.7 C
Kwun Tong                    27.4 C               35.5 C
Sham Shui Po                 26.9 C               35.7 C
Kai Tak Runway Park          27.9 C               35.7 C
Yuen Long Park               25.8 C               35.9 C

Duration of sunshine (King's Park):              10.2 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 7.
Sea surface temperature (Waglan Island):        28.6 C 

Yesterday's (27 Sep 2016) 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                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.10
Kwun Tong                           0.12
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 during
the period 1987-2015, 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 27 Sep
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