12
FR. Y, MAY 10, 1985
A TROUGH OF LOW PRESSURE FORMED OVER CENTRAL CHINA ON APRIL 19 AND IT MOVED SOUTHEASTWARDS CROSSING THE EASTERN COAST OF CHINA LATE ON APRIL 20. OCCASIONAL HEAVY SHOWERS AND ISOLATED THUNDERSTORMS OCCURRED ON APRIL 20 UNDER THE INFLUENCE OF THIS
TROUGH
A SPELL OF FINE AND SUNNY WEATHER PREVAILED FROM APRIL 21 TO 25 APART FROM THE OCCURRENCE OF MORNING FOG ON APRIL 21, 23 AND 25 AND SOME MIST ON APRIL 22.
A TROUGH OF LOW PRESSURE FORMED OVER CENTRAL CHINA ON APRIL 24. IT MOVED STEADILY SOUTHWARDS AND DEVELOPED INTO A COLD FRONT ON APRIL 25.
THE WEATHER WAS FINE IN THE MORNING OF APRIL 26 BUT IT TURNED CLOUDY WITH SCATTERED SHOWERS AS THE COLD FRONT CROSSED HONG KONG IN THE EARLY AFTERNOON. THE TEMPERATURE ROSE TO A MAXIMUM OF 27.5 DEGREES CELSIUS ON APRIL 26, THE HIGHEST OF THE MONTH, BEFORE THE ARRIVAL OF THE COLD FRONT.
IT WAS OVERCAST WITH PATCHES OF LIGHT RAIN ON APRIL 27 AND 28. THE WEATHER REMAINED CLOUDY ON APRIL 29 AND 30 BUT THERE WERE ALSO SOME SUNNY INTERVALS.
ONLY ONE TROPICAL CYCLONE OCCURRED OVER THE WESTERN NORTH
A TROPICAL PACIFIC AND THE SOUTH CHINA SEA DURING THE MONTH. DEPRESSION FORMED ABOUT 460 NAUTICAL MILES EAST OF LUZON ON APRIL 22. IT MOVED EAST-NORTHEASTWARDS AND DISSIPATED ABOUT 480 NAUTICAL MILES NORTH-NORTHWEST OF GUAM ON APRIL 24.
DURING THE MONTH EIGHT AIRCRAFT WERE DIVERTED FROM HONG KONG DUE TO ADVERSE WEATHER. THE YELLOW FIRE DANGER WARNING WAS IN EFFECT ON APRIL 5 AND 6. THUNDERSTORM WARNINGS WERE ISSUED ON APRIL 8, 9, 10, 11, 12, 13, 14, 19 AND 20. FLOOD WARNINGS WERE ISSUED ON APRIL 9, 10 AND 11.
SIGNALS HOISTED DURING THE MONTH WERE AS FOLLOWS:
WEATHER SYSTEM
SIGNAL
DATE AND TIME OF HOISTING
DATE AND TIME OF LOWERING
MARCH 31 11.00 PM WINTER MONSOON STRONG MONSOON WINTER MONSOON STRONG MONSOON APRIL 12 WINTER MONSOON STRONG MONSOON APRIL 26
APRIL 1
8.10 AM
5.00 AM 9.05 PM
APRIL 12
4.40 PM
APRIL 27
2.10 AM
/THE MONTH'S