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The Weather of June 2006

    June 2006 was wetter and cloudier than usual. The total rainfall of 469.2 millimetres in the month was 93.2 millimetres above the normal figure. The accumulated rainfall since 1 January amounted to 1202.3 millimetres, 21 percent more than the normal of 992.5 millimetres for the same period. Dominated by rainy and cloudy weather, the total bright sunshine duration in the month was only 107.8 hours, the tenth lowest for June.

    Affected by an active trough of low pressure, the weather was unsettled with heavy showers and squally thunderstorms on the first three days of the month. The heavy downpour on 2 June brought over 150 millimetres of rainfall to Tsuen Wan, Sha Tin, Sai Kung and the northern part of Lantau Island. The southwest monsoon set in and showery weather prevailed from 4 to 8 June.

    Heavy rain and squally thunderstorms returned on 9 June as a trough of low pressure over southern China moved towards the coast. More than 100 millimetres of rainfall was recorded over most parts of Hong Kong and there were over 50 reports of flooding. On that night, a squall line developed over the Pearl River Estuary and swept across Hong Kong, bringing heavy rain and severe squalls. Peak gusts of 77 and 101 kilometres per hour were recorded at Central and Shek Kwu Chau respectively. About 20 trees were blown down at Ap Lei Chau. The weather remained showery with a few thunderstorms in the next four days.

    Local weather improved on 14 June when the trough of low pressure moved away from the south China coast. In the following eight days, the weather was characterized by periods of sunshine and occasional showers.

    Under the influence of a ridge of high pressure over southeastern China, it was fine and hot on 23 June. Temperature rose to 32.9 degrees, the highest in this month. Apart from a few isolated showers, sunny and hot weather persisted in the ensuing four days.

    On 27 June, a tropical depression developed over the south China sea and intensified into a tropical storm. Named Jelawat, it moved northwest the next day and skirted the northeastern part of Hainan in the evening. Jelawat weakened into an area of low pressure over the western part of Guangdong on 29 June. The outer rain band of Jelawat brought scattered squally showers and thunderstorms to Hong Kong on 28 and 29 June. The weather turned mainly fine on the last day of the month.

    Two tropical cyclones occurred in the western North Pacific and the South China Sea in the month.


The radar image captured by the Doppler weather radar at Tai Mo Shan at 9:12 p.m. on 9 June 2006. The squall line has just passed Ap Lei Chau and rain started falling there.

 

    Details of issuance and cancellation of various warnings/signals in the month are summarized in Tables 1.1 to 1.6.  Monthly meteorological figures and departures from normal for June are tabulated in Table 2.


 

Warnings and Signals issued in June 2006


Table 1.1   Tropical Cyclone Warning Signals

Name of
Tropical Cyclone		 Signal
Number		 Beginning Time Ending Time
Day/Month HKT Day/Month HKT
JELAWAT 1 27 / 6 0940 28 / 6 1840


Table 1.2   Rainstorm Warning Signals

Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Amber 2 / 6 1035 2 / 6 1055
Red 2 / 6 1055 2 / 6 1445
Amber 2 / 6 1445 2 / 6 1530
Amber 9 / 6 0200 9 / 6 0300
Amber 9 / 6 1025 9 / 6 1055
Red 9 / 6 1055 9 / 6 1115
Black 9 / 6 1115 9 / 6 1330
Red 9 / 6 1330 9 / 6 1420
Amber 9 / 6 1420 9 / 6 1520
Amber 9 / 6 2040 9 / 6 2230
Amber 13 / 6 0335 13 / 6 0415
Red 13 / 6 0415 13 / 6 0535


Table 1.3   Landslip Warning

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
2 / 6 1400 2 / 6 2215
9 / 6 1430 9 / 6 1720


Table 1.4   Thunderstorm Warning

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
1 / 6 0430 1 / 6 0900
1 / 6 1120 1 / 6 1445
2 / 6 0005 2 / 6 0200
2 / 6 0715 2 / 6 1515
2 / 6 1615 2 / 6 1645
2 / 6 1740 2 / 6 2100
2 / 6 2215 3 / 6 0600
3 / 6 1050 3 / 6 1400
3 / 6 1530 3 / 6 1630
5 / 6 0745 5 / 6 0845
6 / 6 0910 6 / 6 1015
7 / 6 0925 7 / 6 1030
8 / 6 2250 9 / 6 0600
9 / 6 0725 9 / 6 1520
9 / 6 1800 9 / 6 2300
12 / 6 0930 12 / 6 1030
12 / 6 1335 12 / 6 1445
13 / 6 0215 13 / 6 0700
18 / 6 1330 18 / 6 1430
18 / 6 1450 18 / 6 1700
18 / 6 2130 18 / 6 2300
19 / 6 0600 19 / 6 0900
19 / 6 1115 19 / 6 1315
20 / 6 1055 20 / 6 1200
20 / 6 1320 20 / 6 1630
20 / 6 1810 20 / 6 1915
20 / 6 2345 21 / 6 0500
21 / 6 1040 21 / 6 1245
21 / 6 1320 21 / 6 1430
21 / 6 1535 21 / 6 1645
22 / 6 0830 22 / 6 1500
26 / 6 1313 26 / 6 1415
27 / 6 0640 27 / 6 0900
27 / 6 1215 27 / 6 1415
28 / 6 0905 28 / 6 1600
28 / 6 1620 28 / 6 1800
29 / 6 0820 29 / 6 1000
29 / 6 1120 29 / 6 1230
30 / 6 0145 30 / 6 0600
30 / 6 1040 30 / 6 1145


Table 1.5   Very Hot Weather Warning

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
23 / 6 1630 25 / 6 1620


Table 1.6   Special Announcement on Flooding
in the Northern New Territories

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
9 / 6 1040 9 / 6 1600


Table 2   Figures and Departures from Normal - June 2006

Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 29.9 degrees C 0.4 degree below normal
Mean Air Temperature 28.0 degrees C 0.2 degree above normal
Mean Daily Minimum Air Temperature 26.3 degrees C 0.4 degree above normal
Mean Dew Point Temperature 25.1 degrees C 0.7 degree above normal
Mean Relative Humidity 85 % 3 % above normal
Mean Cloud Amount 77 % 2 % above normal
Total Rainfall 469.2 mm 93.2 mm above normal
Number of hours of Reduced VisibilityΔ 9 hours 16.2 hours below normal§
Total Bright Sunshine Duration 107.8 hours 53.3 hours below normal
Mean Daily Global Solar Radiation 13.03 Megajoule / square metre 3.52 Megajoule below normal
Total Evaporation 97.7 mm 46.2 mm below normal


  Remarks : All measurements were made at the Hong Kong Observatory except sunshine, solar radiation and evaporation which were recorded at King's Park Meteorological Station and visibility which was observed at the Hong Kong International Airport.
  Δ

The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.

Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10-minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.


 

The calibration factors of the pyranometer at King's Park in 2006 and 2007 have been re-computed based on the results of a regional instrument comparison in Asia in 2007. The readings of total global solar radiation at King's Park in 2006 and 2007 displayed in this web page before 13 June 2008 have been revised on 13 June 2008 using the new calibration factors.

  *   Departure from 1961-1990 climatological normal, except for number of hours of reduced visibility.
  §   Departure from mean value between 1997 and 2005.


daily values of selected meteorological elements for HK for June 2006

Extract of Meteorological Observations in Hong Kong for June 2006