Yesterday's Weather and Radiation Level

HKO READINGS & RADIATION LEVEL

YESTERDAY'S WEATHER AND RADIATION LEVEL:
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HONG KONG OBSERVATORY
MAXIMUM AIR TEMPERATURE                       22.6 C
MINIMUM AIR TEMPERATURE                       16.6 C
GRASS MINIMUM TEMPERATURE                     14.7 C
RELATIVE HUMIDITY                          45 - 73 PERCENT
RAINFALL                                         0 MM
TOTAL RAINFALL SINCE 1ST JANUARY            3057.2 MM
AGAINST AN AVERAGE OF                       2340.2 MM

OTHER STATIONS                MIN                  MAX
KING'S PARK                  15.8 C               23.4 C
WONG CHUK HANG               17.0 C               24.3 C
TA KWU LING                  10.0 C               25.4 C
LAU FAU SHAN                 14.0 C               23.5 C
TAI PO                       14.8 C               23.6 C
SHA TIN                      14.4 C               23.8 C
TUEN MUN                     15.7 C               26.6 C
TSEUNG KWAN O                15.0 C               24.0 C
SAI KUNG                     15.8 C               21.3 C
CHEUNG CHAU                  16.0 C               23.5 C
CHEK LAP KOK                 17.0 C               23.5 C
TSING YI                     16.5 C               24.8 C
SHEK KONG                    12.7 C               24.8 C
TSUEN WAN                    13.8 C               24.6 C
HONG KONG PARK               16.0 C               25.1 C
SHAU KEI WAN                 16.4 C               22.2 C
KOWLOON CITY                 15.6 C               24.6 C

DURATION OF SUNSHINE (KING'S PARK):              9.9 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 6.
SEA SURFACE TEMPERATURE (WAGLAN ISLAND):        23.4 C

YESTERDAY'S (21 NOV 2008) AVERAGE AMBIENT GAMMA RADIATION
DOSE RATE TAKEN OUTDOORS IN HONG KONG RANGED FROM 0.09 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
(MICROSIEVERTS/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                          0.10
KING'S PARK                         0.14
TSIM BEI TSUI                       0.13

NOTE
1.     FROM READINGS TAKEN AT VARIOUS LOCATIONS IN HONG KONG DURING
THE PERIOD 1987-2007, THE BACKGROUND AMBIENT GAMMA RADIATION
LEVELS MAY VARY BETWEEN 0.06 AND 0.3 MICROSIEVERT PER HOUR.

2.     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.

3.     FOR EXAMPLE, IF AMBIENT GAMMA RADIATION IS THE ONLY FACTOR
CONTRIBUTING TO THE RADIATION DOSE TO A PERSON, THIS DOSE
OF 5000 MICROSIEVERTS MAY BE REACHED WHEN THE AMBIENT GAMMA
DOSE RATE IS 1000 MICROSIEVERTS PER HOUR (MORE THAN 3000
TIMES ABOVE BACKGROUND) AND LASTS FOR 5 HOURS; OR WHEN THE
DOSE RATE IS 200 MICROSIEVERTS PER HOUR (MORE THAN 600
TIMES ABOVE BACKGROUND) AND LASTS FOR 25 HOURS.