XN000022-1991-05-11 — Page 4

SATURDAY, MAY 11, 1991

THE RAIN BASED OFF AFTER THE CLOUDS DID NOT BREAK UNTIL, APRIL 23.

MORNING OF APRIL 21, BUT THE

FINE WEATHER PREVAILED FOR THE NEXT THREE DAYS WITH TEMPERATURES GENERALLY ON THE RISE. THE MAXIMUM DEGREES ON APRIL 26 WAS THE HIGHEST FOR THE WARMEST SO FAR THIS YEAR.

TEMPERATURE OF 30.4 MONTH AND ALSO THE

CLOUD AMOUNT INCREASED ON APRIL 27, LEADING TO MISTY CONDITIONS THE NEXT DAY AND MORE FREQUENT OCCURRENCE OF DRIZZLE. THE DRIZZLE TURNED INTO RAIN IN THE EVENING OF APRIL 29 AS CLOUDS ASSOCIATED WITH THE REMNANT OF TROPICAL STORM VANESSA SPREAD TOWARDS THE SOUTH CHINA COASTAL AREAS.

HEAVY DOWNPOUR AND THUNDERSTORMS OCCURRED OVER THE SOUTHERN PART OF THE TERRITORY IN THE MORNING OF APRIL. 30. ALTHOUGH THE RAINFALL AMOUNT RECORDED AT THE ROYAL OBSERVATORY FOR THE DAY WAS NO MORE THAN 30 MILLIMETRES, OVER 100 MILLIMETRES WERE RECORDED AT VARIOUS LOCATIONS IN HONG KONG ISLAND.

TROPICAL STORM VANESSA WAS THE ONLY TROPICAL CYCLONE THAT OCCURRED OVER THE WESTERN NORTH PACIFIC AND THE SOUTH CHINA SEA IN THE MONTH OF APRIL.

OF THE 24 AIRCRAFT DIVERSIONS IN APRIL, MOST WERE DUE ΤΟ THE FOGGY WEATHER ON APRIL 9. THE YELLOW FIRE DANGER WARNING WAS

IN EFFECT ON APRIL 5. THUNDERSTORM WARNING WAS ISSUED ON APRIL 30.

THE ONLY SIGNAL HOISTED DURING THE MONTH WAS AS FOLLOWS:

WEATHER

SYSTEM

SIGNAL

DATE & TIME

OF HOISTING

DATE & TIME OF LOWERING

WINTER

MONSOON

STRONG MONSOON

MARCH 31 4.05 PM

APRIL 1 7.30 AM

THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE:

TOTAL BRIGHT SUNSHINE

128.7 HOURS ; 19.8 HOURS ABOVE

NORMAL

MRAN DAILY GLOBAL SOLAR RADIATION 13.44 MJ/SQ.M.; 0.30 MJ/SQ.M.

TOTAL RAINFALL

MEAN AMOUNT OF CLOUD

MEAN RELATIVE HUMIDITY

MEAN DAILY MAXIMUM

AIR TEMPERATURE

ABOVE NORMAL

34.7 MM; 126.8 MM BELOW

NORMAL

73 PER CENT ; 5 PER CENT LESS

THAN NORMAL

81 PER CENT; 2 PER CENT LOWER

THAN NORMAL

25.6 DEGREES CELCIUS; 0.7 DEGREE CELCIUS

ABOVE NORMAL.

/MEAN AIR