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SUNDAY, MAY 10, 1987
OVERNIGHT ON APRIL 26, WINDS FRESHENED FROM THE EAST, GIVING RISE TO SLIGHTLY COOLER AND CLOUDY CONDITIONS WITH SOME LIGHT RAIN. HOWEVER, ON APRIL 27, WINDS BECAME MODERATE AND SUNNY PERIODS RETURNED BETWEEN APRIL 28 AND 30.
IN APRIL, ONLY ONE TROPICAL CYCLONE OCCURRED OVER THE WESTERN NORTH PACIFIC. TROPICAL STORM PERCY DEVELOPED OVER THE PACIFIC ABOUT 510 KM EAST OF YAP ON THE MORNING OF APRIL 11. IT MOVED NORTHWESTWARDS AND DISSIPATED AT ABOUT 330 KM NORTHEAST OF YAP THE NEXT DAY.
DURING THE MONTH. SEVEN AIRCRAFT WERE DIVERTED FROM HONG KONG DUE TO ADVERSE WEATHER. THUNDERSTORM WARNINGS WERE ISSUED ON APRIL 5, 6, 7 AND 12. FLOOD WARNINGS WERE ISSUED ON APRIL 5, 6 AND 12 AND A LANDSLIP WARNING WAS ISSUED ON APRIL 6. THE YELLOW FIRE DANGER WARNING WAS IN EFFECT FROM APRIL 17 TO 19.
SIGNALS HOISTED DURING THE MONTH WERE AS FOLLOWS:
WEATHER
SYSTEM
SIGNAL
DATE AND TIME OF HOISTING
DATE AND TIME OF LOWERING
WINTER
STRONG
MARCH 31
11 PM
APRIL 1 6.05 AM
MONSOON
MONSOON
WINTER
STRONG
APRIL 11
11 PM
APRIL 13
6 PM
MONSOON
MONSOON
WINTER
STRONG
APRIL 27
5 AM
APRIL 27 12 NOON
MONSOON
MONSOON
THE MONTH'S FIGURES AND DEPARTURES FROM NORMAL WERE:
SUNSHINE
130.2 HOURS 10.0 HOURS ABOVE NORMAL
GLOBAL SOLAR RADIATION
12.53 MJ/SQ.M
-
RAINFALL
CLOUD INESS
RELATIVE HUMIDITY
MEAN MAXIMUM TEMPERATURE
MEAN TEMPERATURE
MEAN MINIMUM TEMPERATURE
MEAN DEW POINT
TOTAL EVAPORATION
1.2 MJ/SQ.M BELOW NORMAL
277.8 MM - 138.4 MM ABOVE NORMAL
79 % = 3 % MORE THAN NORMAL
86 % 3 % HIGHER THAN NORMAL
24.3 DEGREES C - 0.7 DEGREE C BELOW NORMAL
21.9 DEGREES C - 0.2 DEGREE C BELOW NORMAL
20.2 DEGREES C - 0.2 DEGREE C ABOVE NORMAL
19.3 DEGREES C = 0,4 DEGREE C ABOVE NORMAL
-
83.4 MM 30.1 MM BELOW NORMAL
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