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Bulletin issued at 09:02 HKT 31/Oct/2018

At 9 a.m. at the Hong Kong Observatory the air temperature was 23 degrees Celsius and the relative humidity 42 per cent.
During the past hour the mean UV Index recorded at King's Park was 1. The intensity of UV radiation was low.

Please be reminded that:

The Tropical Cyclone Signal No. 1 has been issued.
The Fire Danger Warning is Red and the fire risk is extreme.

The air temperatures at other places were:

King's Park 23 degrees;
Wong Chuk Hang 24 degrees;
Ta Kwu Ling 23 degrees;
Lau Fau Shan 21 degrees;
Tai Po 22 degrees;
Sha Tin 23 degrees;
Tuen Mun 23 degrees;
Tseung Kwan O 23 degrees;
Sai Kung 23 degrees;
Cheung Chau 22 degrees;
Chek Lap Kok 24 degrees;
Tsing Yi 23 degrees;
Shek Kong 23 degrees;
Tsuen Wan Ho Koon 21 degrees;
Tsuen Wan Shing Mun Valley 22 degrees;
Hong Kong Park 23 degrees;
Shau Kei Wan 24 degrees;
Kowloon City 23 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 23 degrees;
Stanley 24 degrees;
Kwun Tong 23 degrees;
Sham Shui Po 23 degrees;
Kai Tak Runway Park 24 degrees;
Yuen Long Park 23 degrees;
Tai Mei Tuk 23 degrees.

Between midnight and 9 a.m. the minimum temperature was 22.9 degrees Celsius at the Hong Kong Observatory.

Here is the information on Severe Tropical Storm Yutu:
Location: 17.5 degrees north, 118.0 degrees east; Maximum sustained wind near its centre: 110 km/h.


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


Climatological Information for 31 Oct

Regional Weather in Hong Kong

Information on Tropical Cyclones

Hong Kong Climatology


Local Weather Forecast
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Bulletin updated at 08:45 HKT 31/Oct/2018

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

Weather forecast for today

Mainly fine and very dry. The maximum temperature will be around 28 degrees. Moderate to fresh northerly winds, occasionally strong offshore and on high ground.

Outlook : Windy in the next couple of days. Sunny periods over the weekend and early next week.


(The above forecast period is valid up to 23:59 HKT today, 31/10/2018; 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 09:00 HKT 31/Oct/2018

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

GENERAL SITUATION AT 302100 UTC:
THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS. FOR DETAILS ON SEVERE TROPICAL STORM YUTU (1826), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 310100 UTC:

HONG KONG= N TO NE 6-7, UP TO 8 LATER. DOWN TO 2000 M IN ISOL HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 6 M LATER. SWELL NE 2-3 M, SE 2-3 M. TEMP 28-21 C. =
KWANGTUNG= N TO NE 8-9, UP TO 11 IN E LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 12 M IN E LATER. SWELL NE 3 M, SE 3 M. =
TAIWAN STRAIT= NE 8-9, OCNL 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 10 M. SWELL NE 3-5 M, SE 3 M. =
BASHI= E TO NE 9-10, UP TO 11 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 8-10 M, UP TO 12 M LATER. SWELL E TO NE 5 M, S TO SE 5 M. =
PRATAS= N TO NE 10-11, BEC CYCLONIC 12. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M, BEC 14 M. SWELL E TO NE 5-7 M, SE 5-7 M. =
BALINTANG= E TO SE 10-11. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M. SWELL E TO NE 5 M, S TO SE 5 M. =
SCARBOROUGH= CYCLONIC 10-11, SW 9 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 10-12 M, 8 M LATER. SWELL N TO NE 5 M. =
PARACEL= N TO NE 8-9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M. SWELL E TO NE 3-5 M. =
TONKIN= N TO NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL NE UP TO 2 M. =
DANANG= N TO NE 5-6, OCNL 7. FINE. SEA UP TO 4 M. SWELL E TO NE 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.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 09:30 HKT 31/Oct/2018

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 9:30 a.m. on 31 October 2018

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

    Weather Situation:
    The northeast monsoon is affecting the south China coastal waters.

    At 9 a.m., Severe Tropical Storm Yutu with maximum sustained winds of about 110 kilometres per hour near its centre was located near 17.5 degrees north, 118.0 degrees east. It is forecast to move northwest at about 12 kilometres per hour across the northeastern part of the South China Sea.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North to northeast force 6 to 7, up to force 8 later.
    Isolated heavy squally showers and thunderstorms.
    Rough to very rough seas.

    Nan'ao and Shanwei:
    North to northeast force 8 to 9, force 10 to 11 later.
    Frequent heavy squally showers and thunderstorms.
    Very rough seas, becoming very high later.

    South of Hong Kong and Shangchuan Dao:
    North to northeast force 7 to 8, up to force 9 later.
    Scattered heavy squally showers and thunderstorms.
    Very rough seas, becoming high later.

    Outlook for the next 48 hours
    North to northeasterly winds of force 8 to 9, becoming cyclonic winds of force 11 to 12 in east. Frequent heavy squally showers and thunderstorms.

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

    Waglan Island Wind north force 6

    Shantou Wind northwest force 1
      Visibility 30 Kilometres

    Huangmaozhou Wind north force 5

    Macau Wind north force 4
      Visibility 26 Kilometres

    Xisha Wind north-northeast force 3
      Visibility 17 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 04:00 HKT 31/OCT/2018
    (Next update at 9:00-9:30 HKT 31/OCT/2018)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     STRONG WINDS AND SEV TURB.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE COASTAL
     AREAS OF GUANGDONG.
     TYPHOON YUTU HAS WEAKENED INTO A SEVERE TROPICAL
     STORM. AT 3 A.M., YUTU WAS CENTRED NEAR 16.9
     DEGREES NORTH, 118.6 DEGREES EAST. IT IS
     FORECAST TO MOVE NORTHWEST OR WEST-NORTHWEST AT
     ABOUT 8 KNOTS ACROSS THE NORTHERN PART OF THE
     SOUTH CHINA SEA.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0400 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/15
       OFFSHORE:  360/20-25, OCNL 30 LATER             23-27
   B.   2000 FT:  010/25-30, OCNL 35                   21
   C.   5000 FT:  040/20                               17
   D.  10000 FT:  080/15                               7
   E.  18000 FT:  280/10                               MS4
   F.  24000 FT:  330/10                               MS15
   G.  30000 FT:  240/10                               MS28
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      NO CLOUDS OF HEIGHT AT OR BELOW 10000 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 9200 FT
   M. TURBULENCE    : MOD TO SEV OFFSHORE AND NEAR HILLS
   N. SEA STATE     : 2.5-4.0 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     FRESH NORTHERLY WINDS, STRONG OFFSHORE AND ON
     HIGH GROUND. SUNNY PERIODS.=

    ===================================================================
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 12:30 HKT on 20 Oct 18

    VHHK SIGMET 1 VALID 200040/200440 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1706 E11418 - N1642 E11400 - N1930 E11130 - N2042 E11130 - N2012 E11242 - N1706 E11418 TOP FL450 MOV WNW 10KT NC= VHHK SIGMET 2 VALID 200440/200840 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N1718 E11430 - N1642 E11400 - N1930 E11130 - N2042 E11130 - N2024 E11300 - N1718 E11430 TOP FL480 MOV NW 05KT 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 08:45 HKT 31/Oct/2018

    Tropical Cyclone Warning Bulletin

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

    The Standby Signal, No. 1 was issued at 8:40 a.m.

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

    At 9 a.m., Severe Tropical Storm Yutu was estimated to be about 670 kilometres southeast of Hong Kong (near 17.5 degrees north 118.0 degrees east) and is forecast to move northwest at about 12 kilometres per hour crossing the northeastern part of the South China Sea.

    Yutu moved northwest and weakened slightly early this morning. Yutu is forecast to slow down and turn north today and tomorrow, crossing the northeastern part of the South China Sea. According to the present forecast track, Yutu will maintain a distance of over 500 kilometres away from Hong Kong most of the time today. The chance of issuing Strong Wind Signal, No. 3 during the day is not high. With the combined effect of northeast monsoon and Yutu, winds over the coast of Guangdong are expected to strengthen on Thursday and Friday.

    (Precautionary Announcements with No. 1 Signal)

    1. Precautions should be taken. Windows and doors should be checked.

    2. Those who have duties during a tropical cyclone should now remain on call.

    3. People planning to visit Guangdong, Macau, outlying islands or remote parts of Hong Kong should note that changes in weather may affect your trips.

    4. Fishing vessels and low power vessels in open sea should seek shelter as soon as possible and be secured properly with moorings.

    5. Construction and property management practitioners should make sure that overhanging facilities and temporary structures outdoors are securely fastened, and should take precautionary measures.

    6. Listen to radio, watch TV or browse the Hong Kong Observatory's website and mobile app for the latest 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
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    Severe Weather Information Centre

    Bulletin issued at 09:30 HKT 31/Oct/2018


    Tropical Cyclone Warning

    At 310000 UTC, Severe Tropical Storm Yutu (1826) with central pressure 975 hectopascals was centred within 60 nautical miles of one seven point four degrees north (17.4 N) one one eight point zero degrees east (118.0 E) and is forecast to move northwest at about 6 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 60 knots.

    Radius of over 33 knot winds 210 nautical miles over northeast quadrant, 180 nautical miles elsewhere.
    Radius of over 47 knot winds 60 nautical miles.
    Radius of over 2 metre waves 240 nautical miles.

    Forecast position and intensity at 010000 UTC
    One nine point six degrees north (19.6 N)
    One one six point five degrees east (116.5 E)
    Maximum winds 65 knots.

    Forecast position and intensity at 020000 UTC
    Two one point five degrees north (21.5 N)
    One one six point nine degrees east (116.9 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 030000 UTC
    Two two point three degrees north (22.3 N)
    One one seven point eight degrees east (117.8 E)
    Maximum winds 25 knots.

    Forecast position and intensity at 040000 UTC
    Dissipated over sea.



    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 31/Oct/2018 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     28.5 C
Minimum Air Temperature                     23.4 C
Grass Minimum Temperature                   18.0 C
Relative Humidity                        26 - 39 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2077.6 mm
Against an average of                     2333.5 mm

Other Stations                Min                  Max
King's Park                  23.0 C               28.0 C
Wong Chuk Hang               22.7 C               29.5 C
Ta Kwu Ling                  18.7 C               29.1 C
Lau Fau Shan                 18.5 C               28.0 C
Tai Po                       21.2 C               27.0 C
Sha Tin                      23.0 C               28.4 C
Tuen Mun                     19.2 C               29.3 C
Tseung Kwan O                21.0 C               29.3 C
Sai Kung                     22.8 C               27.5 C
Cheung Chau                  20.1 C               30.1 C
Chek Lap Kok                 22.8 C               30.4 C
Tsing Yi                     21.5 C               29.2 C
Shek Kong                    18.4 C               29.8 C
Tsuen Wan Ho Koon            20.5 C               27.3 C
Tsuen Wan Shing Mun Valley   19.5 C               29.7 C
Hong Kong Park               23.1 C               30.1 C
Shau Kei Wan                 23.0 C               29.2 C
Kowloon City                 22.8 C               28.7 C
Happy Valley                 22.6 C               30.4 C
Wong Tai Sin                 23.2 C               29.6 C
Stanley                      23.5 C               29.3 C
Kwun Tong                    23.2 C               28.3 C
Sham Shui Po                 20.4 C               30.5 C
Kai Tak Runway Park          23.4 C               28.4 C
Yuen Long Park               18.5 C               29.7 C
Tai Mei Tuk               22.4 C               28.8 C

Duration of sunshine (King's Park):              10.5 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 7.
 

Yesterday's (30 Oct 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
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 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 30 Oct
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