XN000022-1991-07-13 — Page 3

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SATURDAY, JULY 13, 1991

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HOWEVER, UNLIKE THE FINE SPELL EARLIER IN THE MONTH, THERE WERE SOME SHOWERS AROUND. THE SHOWERS WERE MOSTLY BRIEF AND LOCALISED DURING THE PERIOD, EXCEPT ON THE MORNING OF JUNE 18 WHEN THUNDERSTORMS WERE REPORTED.

THE WEATHER TURNED FOR THE WORSE ON JUNE 19 AS A TROUGH OF LOW PRESSURE DEVELOPED OVER GUANGDONG. THE TROUGH SUBSEQUENTLY LINGERED FOR DAYS NEAR THE SOUTH CHINA COAST, MAINTAINING A PROLONGED PERIOD OF RAINY WEATHER WHICH LASTED TILL JUNE 27.

THUNDERY ACTIVITY WAS MOST RAMPANT TORRENTIAL RAIN OVER THE WESTERN PART OF THE CAUSED WIDESPREAD FLOODING AND PARALYSED ROAD DURING THE EVENING RUSH HOURS.

FROM JUNE 19 TO 22. TERRITORY ON JUNE 21 TRAFFIC IN TSUEN WAN

LOW

ENHANCED CONVECTIVE ACTIVITY ASSOCIATED WITH AN AREA OF PRESSURE ALONG THE TROUGH TO THE EAST OF HONG KONG CAUSED A MOMENTARY STRENGTHENING OF THE NORTHEASTERLIES LATER ON JUNE 24.

AS A RESULT, COOLER AND DRIER AIR FROM INLAND AREAS WAS DRAWN IN, LEADING TO THE MONTH'S LOWEST TEMPERATURE OF 22.8 DEGREES ON THE DAY AND A. CLEARANCE OF CLOUDS THE NEXT MORNING.

CLOUDS THOUGH

THE SUNNY SKY WAS, HOWEVER, SHORT-LIVED AS RAIN ASSOCIATED WITH THE TROUGH BOON RETURNED. THE TROUGH, WEAKENING AT THE TIME, BROUGHT A DAY OF NEARLY CONTINUOUS RAIN ON JUNE 26.

THE TROUGH EVENTUALLY DISSIPATED AND THE WEATHER BBGAN TO IMPROVE ON JUNE 28. SUNNY AND HOT CONDITIONS THEN PREVAILED FOR THE REST OF THE MONTH.

DURING THE MONTH OF JUNE, ONLY ONE TROPICAL CYCLONE, NAMELY TYPHOON YUNYA, OCCURRED OVER THE WESTERN NORTH PACIFIC AND THE SOUTH CHINA SEA.

THERE WERE TWO AIRCRAFT DIVERSIONS DUE TO INCLEMENT WEATHER

IN

JUNE.

19,

THUNDERSTORM WARNINGS WERE ISSUED ON JUNE 8, 9, 10, 11, 18, 21, 22, AND 23. FLOOD WARNINGS WERE IN EFFECT ON JUNE 8, 9, 20, AND 22.

20.

NO TROPICAL CYCLONE OR STRONG MONSOON SIGNALS WERE HOISTED DURING THE MONTH,

THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE:

TOTAL BRIGHT SUNSHINE

MEAN DAILY GLOBAL

SOLAR RADIATION

TOTAL RAINFALL

MEAN AMOUNT OF CLOUD

163.9 HOURS; 2.8 HOURS ABOVE NORMAL

14.52 MJ/SQ.M. ; 2.03 MJ/SQ.M. BELOW

NORMAL

371.7 MM; 4.3 MM BELOW NORMAL

74 PER CENT ONE PER CENT LESS THAN

NORMAL

/MEAN RELATIVE