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Bulletin issued at 00:02 HKT 15/Sep/2018

At midnight at the Hong Kong Observatory the air temperature was 28 degrees Celsius and the relative humidity 78 per cent.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Very Hot Weather Warning is now in force. Very hot weather might cause adverse health effects. Members of the public should take care to avoid heatstroke.

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

Here is the information on Super Typhoon Mangkhut:
Location: 17.8 degrees north, 123.0 degrees east; Maximum sustained wind near its centre: 250 km/h.


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


Climatological Information for 15 Sep

Regional Weather in Hong Kong

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Bulletin updated at 00:00 HKT 15/Sep/2018

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

The outer subsiding air of Super Typhoon Mangkhut brought very hot weather to Guangdong yesterday. Locally, temperatures over many places rose to 33 degrees or above in the afternoon. Mangkhut took a northwestward track towards Luzon, the threat to the vicinity of the Pearl River Delta has increased. Mangkhut is expected to edge closer to the coast of Guangdong on Sunday. The weather will deteriorate significantly with frequent heavy rain, squalls and storm surge over the region.

Weather forecast for Hong Kong (Saturday, 15 Sep 2018)

Mainly fine and very hot but hazy. A few showers and thunderstorms later. Temperatures will range between 27 and 35 degrees. Light to moderate northeasterly winds, strengthening later. Seas will be rough with swells.

Outlook : Weather will be adverse with storm surge on Sunday. Seas will be high. Winds will moderate gradually later on Monday but there will still be heavy squally showers.


(The above forecast period is valid up to 23:59 HKT today, 15/09/2018; 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 14/Sep/2018

HURRICANE WARNING AREAS: BASHI, PRATAS, BALINTANG AND SCARBOROUGH.
STORM WARNING AREA: KWANGTUNG.
GALE WARNING AREAS: TAIWAN STRAIT AND PARACEL.

GENERAL SITUATION AT 140900 UTC:
FOR DETAILS ON SUPER TYPHOON MANGKHUT (1822), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 141300 UTC:

HONG KONG= NE 4-5, 6-7 LATER. DOWN TO 4000 M IN HAZE. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M, 3-4 M LATER. SWELL E 2-3 M. TEMP 27-35 C. =
KWANGTUNG= NE 5-6, 10-11 IN E LATER. DOWN TO 500 M IN FREQ SQUALLY SHOWERS AND TS LATER. SEA 2-3 M, 10-12 M IN E LATER. SWELL E 3 M, 5-7 M IN E. =
TAIWAN STRAIT= NE 6-7, 8 IN S LATER. DOWN TO 500 M IN SQUALLY SHOWERS AND TS LATER. SEA 3-4 M, 6 M IN S LATER. SWELL E 3 M IN S. =
BASHI= E TO NE 8-9, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 14 M LATER. SWELL E 5-7 M. =
PRATAS= NE 5-6, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 2-3 M, 14 M LATER. SWELL E 5-7 M. =
BALINTANG= E TO NE 12, CYCLONIC 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 14 M. SWELL E 5-7 M. =
SCARBOROUGH= N TO NE 7-8, 12 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, 14 M LATER. SWELL E TO NE 5-7 M. =
PARACEL= N TO NE 4-5, 8-9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS LATER. SEA UP TO 2 M, 6-8 M LATER. SWELL E 3 M. =
TONKIN= N TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. =
DANANG= N TO NE 4-5. ISOL SHOWERS. SEA UP TO 2 M. SWELL E 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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    Bulletin issued at 23:30 HKT 14/Sep/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:30 p.m. on 14 September 2018

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

    Weather Situation:
    At 11 p.m., Super Typhoon Mangkhut with maximum sustained winds of about 240 kilometres per hour near its centre was located near 17.6 degrees north, 123.2 degrees east. It is forecast to move northwest or west-northwest at about 28 kilometres per hour towards the northern part of Luzon and enter the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    Northeast force 5, force 6 to 7 later.
    Hazy, isolated squally showers and thunderstorms later.
    Rough seas.

    Nan'ao and Shanwei:
    Northeast force 5 to 6, force 10 to 11 later.
    Frequent heavy squally showers and thunderstorms later.
    Moderate to rough seas, becoming high to very high later.

    South of Hong Kong:
    Northeast force 5 to 6, force 8 to 9 later.
    Frequent heavy squally showers and thunderstorms later.
    Moderate to rough seas, becoming very rough to high later.

    Shangchuan Dao:
    Northeast force 4 to 5, force 6 later.
    Heavy squally showers and thunderstorms later.
    Moderate seas, becoming rough later.

    Outlook for the next 48 hours
    Northeasterly winds of force 10 to 11, up to force 12 in east, becoming cyclonic winds of force 12. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind east force 1

    Shantou Wind east-northeast force 1
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 4
      Visibility 10 Kilometres

    Huangmaozhou Wind east-southeast force 3

    Xisha Wind northeast force 2
      Visibility 24 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 17:30 HKT 14/SEP/2018
    (Next update at 01:30 HKT 15/SEP/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 5 P.M., SUPER TYPHOON MANGKHUT WAS CENTRED
     NEAR 17.2 DEGREES NORTH, 124.9 DEGREES EAST AND
     IS FORECAST TO MOVE NORTHWEST OR WEST-NORTHWEST
     AT ABOUT 15 KNOTS TOWARDS THE NORTHERN PART OF
     LUZON AND ENTER THE SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 1800 TO 0400 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  030/5-10
       OFFSHORE:  030/10                               32-26
   B.   2000 FT:  030/10                               24
   C.   5000 FT:  040/20                               19
   D.  10000 FT:  060/25                               12
   E.  18000 FT:  070/25                               MS2
   F.  24000 FT:  070/30                               MS12
   G.  30000 FT:  080/25                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY FINE. 
      ISOLATED SHOWERS AND THUNDERSTORMS AT FIRST.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2500 FT  SCT 4000 FT. 
      TEMPO FEW CB 1000 FT  SCT 2000 FT  BKN 4000 FT
   K. VISIBILITY    : 10 KM. TEMPO 4000 M IN SHOWERS. 
                      TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 17000 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    : 27 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTH TO NORTHEASTERLY WINDS, FRESH
     OFFSHORE. MAINLY FINE APART FROM A FEW SHOWERS.
     LOCALISED HAZE.=

    ===================================================================
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.

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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 17:32 HKT on 13 Sep 18

    VHHK SIGMET 2 VALID 130540/130940 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2124 E11636 - N2000 E11600 - N2048 E11130 - N2130 E11130 - N2206 E11254 - N2124 E11636 TOP FL400 MOV WNW 10KT NC= VHHK SIGMET 3 VALID 130940/131340 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1954 E11636 - N1830 E11530 - N2018 E11342 - N1930 E11130 - N2118 E11130 - N2200 E11506 - N1954 E11636 TOP FL400 MOV WNW 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 23:45 HKT 14/Sep/2018

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 is in force.

    This means that a tropical cyclone will come within 800 kilometres of Hong Kong and may affect us.

    At midnight, Super Typhoon Mangkhut was estimated to be about 1050 kilometres east-southeast of Hong Kong (near 17.8 degrees north 123.0 degrees east) and is forecast to move northwest or west-northwest at about 28 kilometres per hour towards the northern part of Luzon and enter the South China Sea.
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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Severe Weather Information Centre

    Bulletin issued at 00:30 HKT 15/Sep/2018


    Tropical Cyclone Warning

    At 141500 UTC, the super typhoon Mangkhut (1822) with central pressure 900 hectopascals was centred within 30 nautical miles of one seven point seven degrees north (17.7 N) one two three point two degrees east (123.2 E) and is forecast to move northwest or west-northwest at about 15 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 135 knots.

    Radius of over 33 knot winds 270 nautical miles.
    Radius of over 47 knot winds 150 nautical miles.
    Radius of over 63 knot winds 90 nautical miles.
    Radius of over 2 metre waves 360 nautical miles.

    Forecast position and intensity at 151500 UTC
    One nine point five degrees north (19.5 N)
    One one seven point four degrees east (117.4 E)
    Maximum winds 115 knots.

    Forecast position and intensity at 161500 UTC
    Two one point seven degrees north (21.7 N)
    One one one point zero degrees east (111.0 E)
    Maximum winds 90 knots.

    Forecast position and intensity at 171500 UTC
    Two two point four degrees north (22.4 N)
    One zero four point six degrees east (104.6 E)
    Maximum winds 30 knots.

    Forecast position and intensity at 181500 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 15/Sep/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.7 C
Grass Minimum Temperature                   25.8 C
Relative Humidity                        69 - 88 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          1676.2 mm
Against an average of                     2076.9 mm

Other Stations                Min                  Max
King's Park                  26.2 C               32.2 C
Wong Chuk Hang               26.3 C               31.8 C
Ta Kwu Ling                  24.3 C               34.8 C
Lau Fau Shan                 24.7 C               31.7 C
Tai Po                       25.4 C               31.8 C
Sha Tin                      25.5 C               33.5 C
Tuen Mun                     25.7 C               32.5 C
Tseung Kwan O                25.1 C               33.1 C
Sai Kung                     25.9 C               31.3 C
Cheung Chau                  25.5 C               30.8 C
Chek Lap Kok                 26.3 C               33.8 C
Tsing Yi                     25.7 C               32.4 C
Shek Kong                    24.8 C               33.3 C
Tsuen Wan Ho Koon            24.3 C               30.8 C
Tsuen Wan Shing Mun Valley   24.8 C               33.7 C
Hong Kong Park               25.9 C               31.5 C
Shau Kei Wan                 25.8 C               31.9 C
Kowloon City                 26.3 C               33.5 C
Happy Valley                 26.1 C               33.5 C
Wong Tai Sin                 26.8 C               33.3 C
Stanley                      26.3 C               31.7 C
Kwun Tong                    26.3 C               32.5 C
Sham Shui Po                 26.2 C               33.7 C
Kai Tak Runway Park          26.7 C               32.3 C
Yuen Long Park               24.5 C               34.4 C
Tai Mei Tuk               25.6 C               32.6 C

Duration of sunshine (King's Park):              7.0 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):        27.3 C 

Yesterday's (14 Sep 2018) 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                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
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 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 14 Sep
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