TUESDAY, JULY 10, 1979
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THE PASSAGE OF A TROUGH OF LOW PRESSURE FROM SOUTH CHINA ON JUNE 7 MARKED THE COMMENCEMENT OF A PERIOD OF UNSETTLED WEATHER WHICH LASTED UNTIL JUNE 11, THUNDERSTORMS WERE REPORTED EVERY DAY DURING THIS PERIOD, BRINGING 230.8 MM OF RAINFALL WHICH ACCOUNTED FOR 61 PER CENT OF THE MONTH'S TOTAL.
THREE LANDSLIPS OCCURRED IN THE MORNING OF JUNE 10 AT WONG TAI SIN, SHA TIN PASS ROAD AND CHA KWO LING, NECESSITATING THE EVACUATION OF ABOUT 200 PEOPLE FROM THEIR HOMES. DOWNPOURS WERE HEAVIEST ON JUNE 11 WHEN THE DAILY RAINFALL AMOUNTED TO 113.6 MM.
THE WEATHER IMPROVED THE FOLLOWING DAY, BUT CONDITIONS REMAINED CLOUDY WITH SOME SLIGHT RAIN UNTIL THE MORNING OF JUNE 14 WHEN THE MONTH'S MINIMUM TEMPERATURE OF 22.1 DEGREES CELSIUS WAS RECORDED. IT WAS A SUNNY DAY AFTER A WEEK'S RAINY AND DULL WEATHER, AND THERE WERE SUNNY INTERVALS ON THE NEXT TWO DAYS.
HOWEVER, AN UPPER-AIR DISTURBANCE BROUGHT SOME SHOWERS ON JUNE 17 AND EARLY IN THE FOLLOWING MORNING.
BETWEEN JUNE 19 AND 22, THE WEATHER WAS MAINLY FINE AND SUNNY APART FROM SOME ISOLATED MORNING SHOWERS, ON THE AFTERNOON OF JUNE 21, TEMPERATURES REACHED A MAXIMUM OF 32.3 DEGREES CELSIUS WHICH WAS THE HIGHEST OF THE MONTH.
FROM JUNE 23 TO 26, MAINLY CLOUDY CONDITIONS PREVAILED WITH SOME SHOWERS AND SUNNY INTERVALS.
THE SOUTHWEST MONSOON BECAME ACTIVE OVER THE NORTHERN PART OF THE SOUTH CHINA SEA FROM JUNE 27 ONWARDS, BRINGING MORE FREQUENT AND HEAVIER SHOWERS. THUNDERSTORMS WERE REPORTED IN THE MORNING OF JUNE 29.
DURING THE MONTH, ONLY ONE TROPICAL CYCLONE WAS REPORTED OVER THE SOUTH CHINA SEA. AN AREA OF LOW PRESSURE NEAR PALAWAN STARTED TO MOVE ACROSS THE SOUTH CHINA SEA ON JUNE 17. IT DEEPENED INTO A TROPICAL DEPRESSION ON JUNE 21 AND REMAINED QUASI-STATIONARY OFF THE VIETNAM COAST FOR ABOUT A DAY BEFORE DRIFTING SOUTHWARDS AND DEGENERATING INTO AN AREA OF LOW PRESSURE ABOUT 100 MILES SOUTHEAST OF DANANG ON JUNE 23.
ONLY ONE AIRCRAFT WAS DIVERTED FROM HONG KONG DUE TO ADVERSE WEATHER DURING THE MONTH. THUNDERSTORM AND/OR HEAVY RAIN WARNINGS WERE ISSUED ON JUNE 7, 8, 9, 10, 11, 28, 29 AND 30.
NO TROPICAL CYCLONE WARNING SIGNALS NOR STRONG MONSOON SIGNALS WERE HOISTED, AND NO FIRE DANGER WARNINGS WERE ISSUED.
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