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SIGNIFICANT WEATHER - MAY 1998

Introduction Bushfires Tornadoes Thunderstorms Wind Temperature Rainfall

INTRODUCTION

With the onset of winter, southern states experienced episodes of gale force winds and cool season waterspouts and tornadoes. Slow-moving rainbands moved across the continent, bringing heavy rain and thunderstorms to some areas.

TORNADOES

Victoria

A waterspout formed out to sea and tracked over Wonthaggi causing damage to approximately 25 homes. Trees and power lines were also brought down.

South Australia

On the afternoon of the 19th, a small tornado tore the roof off a small shop and some tiles off an adjacent house in Ascot Park, a suburb of Adelaide, as a cold front moved through the area.

THUNDERSTORMS

Queensland

A severe thunderstorm caused wind damage to a hospital and school on Bribie Island (48km north of Brisbane) late on the evening of the 4th.

New South Wales

On the 2nd at Port Macquarie, 30mm of rain fell in 20 minutes which caused localised flash flooding.

South Australia

On the afternoon of the 16th, thunderstorms developed in a moist easterly airstream, coupled with an upper level low over northeastern South Australia, producing some flash flooding. 38mm of rain fell in less than an hour around Booleroo (Mid North).

BUSHFIRES

South Australia

On the 13th of May a grass fire burnt 140 hectares of Hinks Conservation Park, 35km southwest of Cleve on Eyre Peninsula. At Carey Gully, in the Adelaide Hills, 30 hectares of grass and scrub was burnt when a "burn-off" got out of control.

Northern Territory

A fire which spread from an untended campfire threatened homes in the Darwin suburb of Palmerston on the 7th and burnt about 100 hectares of scrub. Fires were also reported near Humpty Doo, 40 km east of Darwin on the same day.

A fire threatened homes in the Darwin suburb of Leanyer on the 28th and burnt 16 hectares of grassland.

WIND

Tasmania

Gales on the 23rd caused damage to a house in Devonport and blew down trees in various locations in the northwest and north of the state.

A wind gust unroofed a house in Glenorchy early on the morning of the 28th.

Western Australia

On the 26th a rapidly deepening low pressure system off the lower west coast produced very strong winds with notable gusts recorded at Cape Naturaliste (111 km/h), Cape Leeuwin (107 km/h) and Jandakot (suburban Perth, 98 km/h). There were reports of minor damage to roofs and numerous tree limbs which fell across roads in the southwest.

On the 28th during the passage of a series of active cold fronts Cape Leeuwin registered mean wind speeds of 102 km/h and gusts to 126 km/h. Cape Naturaliste reported gusts to 100km/h. Roof damage was sustained at several properties in the Bunbury area (south of Perth). Falling tree limbs caused interruption to some electricity supplies and blocked roads for short periods of time.

TEMPERATURE

Highest Mean Maximum Temperature for May

                           Previous                Years of
Station          Actual     Highest      Year       Record
                   C          C
Queensland

Double Island Pt 23.8 23.7 1973 57
New South Wales
Cabramurra 10.2 9.9 1996 43 Western Australia
Newman 30.1 28.6 1994 31 Wittenoom 31.5 30.4 1990 45
Northern Territory
Darwin Airport 33.4 33.3 1969 56

Highest Mean Minimum Temperature for May

                             Previous              Years of
Station           Actual      Highest    Year       Record
                    C           C
Queensland

Musgrave 19.5 18.4 1920 30
Western Australia
Carnarvon 17.4 17.0 1980 51 Geraldton 15.7 15.1 1963 57 Merredin 12.5 10.9 1972 32 Newman 17.2 15.8 1984 31 Onslow 21.7 20.0 1984 108 Wittenoom 19.8 18.4 1954 45
Northern Territory
Jabiru Airport 24.0 22.8 1978 20 Elcho Island 23.8 23.3 1968 28 Warruwi 25.5 25.2 1992 32

Highest Daily Maximum Temperature for May

                             Previous              Years of
Station         Actual Date   Highest    Year       Record
                  C             C
Queensland

Hughenden 35.6 2 33.6 1996 34 Collinsville 33.2 1 32.5 1973 41
Western Australia
Cocos Island 31.5 12 31.4 1952 47

Highest Daily Minimum Temperature for May

                             Previous              Years of
Station        Actual  Date  Highest     Year       Record
                 C              C
Queensland

Coen Airport 24.8 2 24.7 1979 31 Burketown 26.4 3 26.1 1968 40 Innisfail 24.0 1 23.5 1986 42 Clermont 21.4 2 20.5 1987 37 Baralaba 22.1 3 21.5 1980 31 Rockhampton 21.8 2 21.7 1988 60
Western Australia
Cocos Island 28.1 13 27.3 1952 47 Geraldton 23.8 8 21.1 1946 56
RAINFALL

Western Australia

A slow moving rainband produced very heavy rains over a small area of the Pilbara from the 26th to the 29th. Onslow registered a daily total of 184.3mm on the 28th contributing to the town's highest May monthly total on record of 373.5mm.

Highest Monthly Rainfall on Record for May

                               Previous              Years of
Station              Actual     Highest     Year      Record
                       mm         mm
Queensland

Proston 172.0 165.4 1983 62 Dunollie 205.2 168.6 1955 49 Hillgrove 111.8 96.8 1983 100 Mundubbera 233.0 191.0 1983 88
New South Wales
Williamtown 340.0 235.5 1962 56 Parramatta 228.6 198.1 1988 33 Frenchs forest 340.8 324.9 1962 41
Western Australia
Onslow 393.7 259.1 1900 110

Highest Daily Rainfall on Record for May

                                  Previous        Years of
Station              Actual  Date  Highest  Year   Record
                       mm            mm
Queensland

Forsayth 43.0 5 35.1 1974 42 Upperstone 116.2 15 102.8 1981 60 Glenwood 102.4 5 67.0 1996 43
Western Australia
Cocos Island 168.2 28 168.1 1956 84

Note: Some statistical records mentioned in this report are based on data that have yet to be fully validated.



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