12
THURSDAY, JUNE 13, 1991
OVER
THERE WERE SOME BRIEF HEAT SHOWERS WHICH OCCURRED MOSTLY AREAS IN THE NEW TERRITORIES. OFFSHORE WATERS TO THE EAST WERE AFFECTED BY MIST PATCHES.
VISIBILITY WAS EVEN POORER IN THE EARLY HOURS OF MAY 21 AS THE OFFSHORE MEST THICKENED INTO FOG.
THE SOUTHWEST MONSOON BECAME ACTIVE ON MAY 22, AND SHOWERY ACTIVITY ALSO INCREASED.
HOWEVER, THE SHOWERS REMAINED LIGHT AND ISOLATED IN NATURE AGAINST A MAINLY FINE SETTING. WINDS WERE RATHER GUSTY AT TIMES, AND GUSTS APPROACHING 60 KILOMETRES PER HOUR WERE REPORTED INSIDE THE HARBOUR.
THE
AFTER SOME BRIEF SHOWERS IN THE KARLY HOURS OF MAY 26, SOUTHWEST MONSOON SUBSIDED DURING THE DAY AND ALONG WITH IT THE SHOWERS.
WITH LONG PERIODS OF SUNSHINE, THE HEAT CONTINUED TO BUILD UP AND THE TEMPERATURE CLIMBED TO THE MONTH'S HIGHEST OF 33.4 DEGREES ON MAY 28.
THIS WAS SOON FOLLOWED BY A FRESHENING OF THE EASTERLIES LATER THAT DAY AND CONSEQUENTLY A SLIGHT DROP IN TEMPERATURES THE NEXT DAY.
DESPITE SOME ISOLATED THUNDERSTORMS ON THE MORNING OF MAY 29 AND FURTHER SPORADIC SHOWERS OVER THE NEXT TWO DAYS, HOURS OF SUNSHINE CONTINUED TO INCREASE TOWARDS THE END OF MAY AS THE FINE SPELL PREVAILED.
DURING THE MONTH OF MAY, ONLY, ONE TROPICAL CYCLONE, NAMELY TYPHOON WALT, OCCURRED OVER THE WESTERN NORTH PACIFIC AND THE SOUTH CHINA SEA.
THERE WERE ALTOGETHER FOUR AIRCRAFT DIVERSIONS IN MAY. THUNDERSTORM WARNINGS WERE ISSUED FOR MAY 1, 15-16, 27, AND 29. FLOOD WARNING WAS IN EFFECT ON MAY 15.
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
MAY 2 9.50 PM
MAY 4 3.30 PM
THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE:
TOTAL BRIGHT SUNSHINE
MEAN DAILY GLOBAL,
SOLAR RADIATION
TOTAL RAINFALL
201.3 HOURS; 47.5 HOURS ABOVE NORMAL
16.13 MJ/8Q.M. ; 0.01 MJ/SQ.M.
ABOVE NORMAL
60.9 MM : 255.8 MM BELOW NORMAL
/MEAN AMOUNT
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