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Bulletin issued at 06:02 HKT 20/Nov/2019

At 6 a.m. at the Hong Kong Observatory the air temperature was 20 degrees Celsius and the relative humidity 66 per cent.

The air temperatures at other places were:

King's Park 19 degrees;
Wong Chuk Hang 20 degrees;
Ta Kwu Ling 17 degrees;
Lau Fau Shan 17 degrees;
Tai Po 17 degrees;
Sha Tin 19 degrees;
Tseung Kwan O 18 degrees;
Sai Kung 19 degrees;
Cheung Chau 19 degrees;
Chek Lap Kok 19 degrees;
Tsing Yi 19 degrees;
Shek Kong 17 degrees;
Tsuen Wan Ho Koon 17 degrees;
Tsuen Wan Shing Mun Valley 19 degrees;
Hong Kong Park 20 degrees;
Shau Kei Wan 19 degrees;
Kowloon City 19 degrees;
Happy Valley 20 degrees;
Wong Tai Sin 19 degrees;
Stanley 19 degrees;
Kwun Tong 19 degrees;
Sham Shui Po 19 degrees;
Kai Tak Runway Park 20 degrees;
Yuen Long Park 18 degrees;
Tai Mei Tuk 18 degrees.

Here is the information on Tropical Storm Kalmaegi at 5 a.m.:
Location: 18.1 degrees north, 121.8 degrees east.


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


Climatological Information for 20 Nov

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Bulletin updated at 05:45 HKT 20/Nov/2019

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

A dry northeast monsoon is bringing generally fine weather to southern China.

Severe Tropical Storm Kalmaegi has made landfall over the northern part of Luzon and weakened into a tropical storm. At 5 a.m., Kalmaegi was centred about 410 kilometres north-northeast of Manila. It is forecast to move southwest at about 30 kilometres per hour across Luzon and weaken gradually. Besides, an area of low pressure is bringing unsettled weather to the seas east of the Philippines, and will develop gradually.

Weather forecast for today

Mainly fine and dry. Relatively cool in the morning. The maximum temperature will be about 24 degrees during the day. Moderate northerly winds, becoming fresh easterlies later.

Outlook : Mainly fine and dry with temperatures rising gradually in the next couple of days.


(The above forecast period is valid up to 23:59 HKT today, 20/11/2019; 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 19/Nov/2019

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

GENERAL SITUATION AT 190900 UTC:
FOR DETAILS ON SEVERE TROPICAL STORM KALMAEGI (1926), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS. THE NORTHEAST MONSOON IS AFFECTING THE FORECAST AREAS.

MARINE FORECAST FOR 24 HOURS FROM 191300 UTC:

HONG KONG= N TO NE 4-5, OCNL 6. FINE. SEA UP TO 3 M. SWELL NE 2 M. TEMP 18-24 C. =
KWANGTUNG= NE 5-6, 7-8 IN E. CLD. SEA 2-3 M, 4-6 M IN E. SWELL NE 2-3 M, SE 2-3 M. =
TAIWAN STRAIT= NE 8-9. ISOL SHOWERS. SEA 6-8 M. SWELL NE 3-4 M. =
BASHI= NE 8-9, UP TO 10 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, UP TO 10 M AT FIRST. SWELL NE 4-5 M, SE 4-5 M. =
PRATAS= NE 6-7, OCNL 8. ISOL SHOWERS. SEA UP TO 6 M. SWELL NE 3-4 M, SE 3-4 M. =
BALINTANG= NE 8-9, CYCLONIC 10 AT FIRST. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 6-8 M, 10 M AT FIRST. SWELL NE 4-5 M, SE 4-5 M. =
SCARBOROUGH= NE 7-8, CYCLONIC 7-8 LATER. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M. SWELL NE 3-4 M. =
PARACEL= NE 6-7. RAIN PATCHES. SEA 3-4 M. SWELL NE 2-3 M. =
TONKIN= N TO NE 5-6. RAIN PATCHES. SEA 2-3 M. =
DANANG= NE 5-6. RAIN PATCHES. SEA 2-3 M. SWELL NE 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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    Bulletin issued at 05:30 HKT 20/Nov/2019

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 5:30 a.m. on 20 November 2019

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

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

    Severe Tropical Storm Kalmaegi has weakened into a Tropical Storm. At 5 a.m., Kalmaegi with maximum sustained winds of about 85 kilometres per hour near its centre was located at 18.1 degrees north, 121.8 degrees east. It is forecast to move southwest at about 30 kilometres per hour across Luzon and weaken gradually.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    East to northeast force 4 to 5, occasionally force 6.
    Moderate to rough seas.

    Nan'ao:
    Northeast force 7 to 8.
    Rough to very rough seas.

    Shanwei:
    Northeast force 6 to 7.
    Rough seas.

    South of Hong Kong and Shangchuan Dao:
    Northeast force 5 to 6, occasionally force 7.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Northeasterly winds of force 5 to 6, force 7 to 8 in east.

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

    Waglan Island Wind north force 4
      Visibility 20 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 30 Kilometres

    Dongsha Wind north-northeast force 5
      Visibility 10 Kilometres

    Huangmaozhou Wind northeast force 4

    Macau Wind north force 3
      Visibility 16 Kilometres

    Xisha Wind northeast force 3
      Visibility 13 Kilometres

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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 20/NOV/2019
    (Next update at 9:00-9:30 HKT 20/NOV/2019)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     NIL
II.  SYNOPSIS OF THE WEATHER SITUATION :
     THE NORTHEAST MONSOON IS AFFECTING THE SOUTH
     CHINA COASTAL AREAS.
     SEVERE TROPICAL STORM KALMAEGI HAS WEAKENED INTO
     A TROPICAL STORM. AT 5 A.M., KALMAEGI WAS
     CENTRED AT 18.1 DEGREES NORTH, 121.8 DEGREES
     EAST. IT IS FORECAST TO MOVE SOUTHWEST AT ABOUT
     16 KNOTS ACROSS LUZON AND WEAKEN GRADUALLY.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0500 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  020/10-15
       OFFSHORE:  020/15-20                            18-24
   B.   2000 FT:  060/10-15                            17
   C.   5000 FT:  030/10                               10
   D.  10000 FT:  340/10                               7
   E.  18000 FT:  270/30                               MS3
   F.  24000 FT:  270/30                               MS14
   G.  30000 FT:  250/35                               MS27
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL
   I. WEATHER       : 
      MAINLY FINE.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 3500 FT SCT 4500 FT
   K. VISIBILITY    : 10 KM.
   L. 0 DEG. C LEVEL: 17000 FT      10 DEG. C LEVEL(S) : 5000, 5200, 9000 FT
   M. TURBULENCE    : MOD OFFSHORE AND NEAR HILLS.
   N. SEA STATE     : 2.0-2.5 M     SEA TEMPERATURE    : 25 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, BECOMING FRESH
     EASTERLIES LATER. MAINLY FINE.=

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

    There is no Significant Weather Information (SIGMET)

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    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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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Bulletin issued at 06:30 HKT 20/Nov/2019


    Tropical Cyclone Warning

    Severe Tropical Storm Kalmaegi (1926) has weakened into a Tropical Storm with central pressure 990 hectopascals. At 192100 UTC, it was centred within 90 nautical miles of one eight point one degrees north (18.1 N) one two two point zero degrees east (122.0 E) and is forecast to move southwest at about 15 knots for the next 24 hours.

    Maximum winds near the centre are estimated to be 45 knots.

    Radius of over 33 knot winds 90 nautical miles.
    Radius of over 2 metre waves 180 nautical miles.

    Forecast position and intensity at 202100 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 20/Nov/2019 
    HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     22.7 C
Minimum Air Temperature                     17.9 C
Grass Minimum Temperature                   16.8 C
Relative Humidity                        59 - 68 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2382.7 mm
Against an average of                     2360.9 mm

Other Stations                Min                  Max
King's Park                  16.8 C               22.3 C
Wong Chuk Hang               18.0 C               22.3 C
Ta Kwu Ling                  15.3 C               23.3 C
Lau Fau Shan                 15.6 C               22.8 C
Tai Po                       15.7 C               23.3 C
Sha Tin                      16.4 C               22.6 C
Tseung Kwan O                15.9 C               23.0 C
Sai Kung                     16.7 C               22.0 C
Cheung Chau                  16.2 C               24.2 C
Chek Lap Kok                 16.9 C               23.2 C
Tsing Yi                     17.1 C               22.8 C
Shek Kong                    15.6 C               23.0 C
Tsuen Wan Shing Mun Valley   15.4 C               23.3 C
Hong Kong Park               17.8 C               22.3 C
Shau Kei Wan                 16.4 C               23.2 C
Kowloon City                 16.2 C               22.7 C
Happy Valley                 17.7 C               22.9 C
Wong Tai Sin                 16.6 C               23.4 C
Stanley                      17.6 C               22.7 C
Kwun Tong                    16.8 C               22.7 C
Sham Shui Po                 16.9 C               24.2 C
Kai Tak Runway Park          17.3 C               22.6 C
Yuen Long Park               16.0 C               23.8 C
Tai Mei Tuk               15.8 C               24.1 C

Duration of sunshine (King's Park):              4.3 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
 

Yesterday's (19 Nov 2019) 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                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.15

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 19 Nov
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