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The month started with cloudy and patchy rain conditions dominating the northern half of the state for a few days due to the interaction between a mid level ridge over the Coral Sea and a mid level trough moving into southeast Australia. Rain areas became heavy through the southern Gulf to central areas, with moderate to locally heavy falls about the tropical coastal areas. There were scattered showers along the southern coast due to the fresher south to southeast airflow.
From the 5th, a fairly strong and very slow moving high in the Bight extended a firm ridge up the east coast of Queensland for the next few days. Strong winds persisted along the tropical and central coasts and rain areas contracted north. Isolated showers persisted along the southeast coast from the 5th to 7th due to the passage of a weak surface trough.
From the 9th to the 11th, the firm east coast ridge started to weaken from the south and strong winds contracted north. A surface trough moved over the southwestern border early on the 10th, swept through the southern districts during the 11th, then crossed the southeast coast on the 12th. Scattered showers and isolated thunderstorms occurred over the southern parts of the state during the 10th and the 11th, then increased to scattered showers and thunderstorms over the Southeast Coast districts on the 12th. Showers persisted over the Cape York Peninsula during this period.
There were fairly stable conditions over most of the state between the 13th to the 14th, apart from isolated showers over the southern and central coasts and scattered showers and thunderstorms over Cape York Peninsula.
A surface trough, coupled with an upper trough, approached the southwestern districts early on the 15th and quickly swept through the southern parts of the state on the 16th. Isolated showers over the southwestern districts on the 15th increased to scattered showers and thunderstorms over the southern interior on the 16th. The upper trough intensified into a cut off low and moved into the central interior during the 17th. Scattered showers and thunderstorms caused moderate to localised heavy falls over the eastern parts of the Central West District. Scattered showers also fell over the Sunshine Coast area and reduced to isolated over the Southeast Coast inland parts as well as over the Darling Downs region.
The upper cutoff low moved towards the southwest into the southern interior on the 18th, while intensifying. Showers and thunderstorms were over most of the Central Coast and the central interior areas, whilst thickening cloud and rain areas developed over the southeast interior. Showers and isolated thunderstorms were over the southwest under the cold mid level trough but rainfall was limited by the lack of lower level moisture. On the 19th, the upper low moved east over the central interior. More widespread and heavier thundery rain areas developed mostly over the southern and central interior as well as the southeast coast, mainly due to the low level convergence of the easterly and northeasterly winds. The Roma area was affected by flooding. The upper level low, or trough, moved off the central coast on the 20th. Scattered showers persisted along the southeast coast during the morning and eased to more isolated during the afternoon. A weak coastal ridge developed along the east coast. The lingering moisture delivered very isolated showers over inland parts. Showers and thunderstorms continued over the Cape York Peninsula during this period.
The east coast ridge continued to develop from the 21st to the 25th and some isolated showers appeared along the central coast. On the 22nd, thunderstorms extended from the southern border ranges through to the Gold Coast Hinterland and then to the southern Brisbane area. Some flash flooding was reported over the Logan and Underwood/Springwood area. On the 23rd, heavy showers and thunderstorms formed near Toowoomba and the western Lockyer Valley during the afternoon.
From the 26th, the strengthening ridge and south to southeasterly winds persisted along the east coast. This combined with an upper level trough that moved over southern and central Queensland. Cloudy conditions with high based thunderstorms were observed over the southwestern districts during the 26th and the 27th. Isolated showers along the east coast during early 26th increased to rain areas and scattered showers from the afternoon of the 26th through to the 27th. Some moderate falls were recorded over the Gold Coast, the northern tropical coast and the southeast of the Upper Flinders. Showers and isolated thunderstorms continued along most parts of the east coast on the 28th, with moderate falls around the Cardwell area and exposed parts and coastal islands of the southern coast.
Showers eased to isolated over the southeast coast, the tropical coast and some exposed parts of the central coast during the last two days of the month.
Heavy rain between the 18th and the 19th caused flooding over the Roma area.
The state averaged April monthly rainfall was 36.74 mm which was slightly below the long-term (1961-1990) April mean rainfall of 41.88 mm. 3.3% of the state received very much above the average rainfall (decile 10 range). These areas included the northwestern parts of the Darling Downs and the southern parts of the Central Coast.
Most of the eastern half of the state as well as the tropical region received above the average rainfall, apart from the northern Tropical Coast between Cairns and Ingham which was below the average. The rainfall over the western and southwestern districts was below the long-term mean with large parts recording no rain.
The wettest overall was Daradgee with 618.4 mm, followed by Bingil Bay with 606.1 mm, then Innisfail with 562.8 mm.Some sites had their highest total April rainfall for at least 20 years.
The wettest single day was at Coconut Island with 180.0 mm on the 18th, followed by Plane Creek Sugar Mill with 160.0 mm on the 2nd, then Daradgee with 155.4 mm on the 2nd.Some sites had their highest April daily rainfall on record. See a map of total rainfall. See a map of rainfall deciles.
The state averaged mean temperature in April was 22.48 °C, which was 1.12 °C below the long-term (1961-1990) average of 23.60 °C. This figure was ranked the 6th coldest April since the area-averaged dataset records started in 1950 and was the coldest since 2008 (4th).
The warmest on average was Coconut Island with 28.1 °C, followed by Scherger RAAF with 27.6 °C, then Horn Island with 27.5 °C.
The coolest on average was Applethorpe with 15.1 °C, followed by Stanthorpe Leslie Parade with 15.7 °C, then Toowoomba Airport with 17.7 °C.
The state averaged maximum temperature in April was 28.89 °C, which was 0.98 °C below the long-term mean of 29.87 °C. This figure was ranked the 11th coldest April since the area-averaged dataset records started in 1950 and was the coldest since 2000 (9th).
The hottest day with 34.7 °C was at Century Mine on the 15th and at Burketown Airport on the 21st, followed by 34.5 °C at Urandangi on the 8th and at Burketown Airport on the 15th, then 34.3 °C at Burketown Airport on the 22nd and at Century Mine on the 22nd.
The warmest days on average were at Burketown Airport with 32.9 °C, followed by Kowanyama Airport with 32.5 °C, then Scherger RAAF with 32.2 °C.
The coolest days on average were at Applethorpe with 20.0 °C, followed by Stanthorpe Leslie Parade with 20.9 °C, then Toowoomba Airport with 22.0 °C.
The coldest day was at Charleville Aero with 15.5 °C on the 15th, followed by Applethorpe with 15.9 °C on the 27th, then Applethorpe with 16.0 °C on the 16th.Some sites had their coldest April day (lowest maximum temperature) on record. Some sites had their lowest April mean daily maximum temperature for at least 20 years. See a map of mean maximum temperatures. See a map of maximum temperature anomalies.
The state averaged minimum temperature in April was 16.09 °C, which was 1.25 °C below the long-term mean of 17.34 °C. This figure was ranked the 8th coldest April since the area-averaged dataset records started in 1950 and was the coldest since 2008 (2nd).
The coldest night was at Applethorpe with 2.5 °C on the 13th, followed by Stanthorpe Leslie Parade with 2.5 °C on the 13th, then Stanthorpe Leslie Parade with 3.2 °C on the 14th.
The coolest nights on average were at Applethorpe with 10.3 °C, followed by Stanthorpe Leslie Parade with 10.5 °C, then Mitchell Post Office and Tambo Post Office with 10.9 °C.
The warmest nights on average were at Coconut Island with 25.1 °C, followed by Horn Island with 25.1 °C, then Willis Island with 25.0 °C.
The warmest nights on average were at Coconut Island and Horn Island with 25.1 °C, followed by Willis Island with 25.0 °C, then with 24.1 °C at Cape Flattery, Low Isles Lighthouse and Sweers Island.The warmest night with 27.2 °C was at Willis Island on the 1st and at Coconut Island on the 21st, followed by 26.8 °C at Coconut Island on the 6th and at Willis Island on the 10th, then Horn Island with 26.7 °C on the 21st.
The strongest wind gust was at Hamilton Island Airport with 91 km/h on the 26th, followed by Cape Moreton Lighthouse with 89 km/h on the 8th, then Double Island Point Lighthouse with 87 km/h on the 5th.
|Extremes in April 2011|
34.7 °C at Century
Mine on the 15th|
34.7 °C at Burketown Airport on the 21st
34.5 °C at Urandangi on the 8th
34.5 °C at Burketown Airport on the 15th
34.3 °C at Burketown Airport on the 22nd
34.3 °C at Century Mine on the 22nd
|Warmest days on average||
32.9 °C at Burketown
32.5 °C at Kowanyama Airport
32.2 °C at Scherger RAAF
|Coolest days on average||
20.0 °C at Applethorpe|
20.9 °C at Stanthorpe Leslie Parade
22.0 °C at Toowoomba Airport
15.5 °C at Charleville
Aero on the 15th|
15.9 °C at Applethorpe on the 27th
16.0 °C at Applethorpe on the 16th
2.5 °C at Applethorpe
on the 13th|
2.5 °C at Stanthorpe Leslie Parade on the 13th
3.2 °C at Stanthorpe Leslie Parade on the 14th
|Coolest nights on average||
10.3 °C at Applethorpe|
10.5 °C at Stanthorpe Leslie Parade
10.9 °C at Mitchell Post Office
10.9 °C at Tambo Post Office
|Warmest nights on average||
25.1 °C at Coconut
25.1 °C at Horn Island
25.0 °C at Willis Island
24.1 °C at Cape Flattery
24.1 °C at Low Isles Lighthouse
24.1 °C at Sweers Island
27.2 °C at Willis
Island on the 1st|
27.2 °C at Coconut Island on the 21st
26.8 °C at Coconut Island on the 6th
26.8 °C at Willis Island on the 10th
26.7 °C at Horn Island on the 21st
|Warmest on average overall||
28.1 °C at Coconut
27.6 °C at Scherger RAAF
27.5 °C at Horn Island
27.5 °C at Weipa Aero
|Coolest on average overall||
15.1 °C at Applethorpe|
15.7 °C at Stanthorpe Leslie Parade
17.7 °C at Toowoomba Airport
618.4 mm at Daradgee|
606.1 mm at Bingil Bay
562.8 mm at Innisfail
180.0 mm at Coconut
Island on the 18th|
160.0 mm at Plane Creek Sugar Mill on the 2nd
155.4 mm at Daradgee on the 2nd
|Highest wind gust||
91 km/h at Hamilton
Island Airport on the 26th|
89 km/h at Cape Moreton Lighthouse on the 8th
87 km/h at Double Island Point Lighthouse on the 5th
|Record highest April daily rainfall|
in April 2011 (mm)
|Rosedale Post Office||149.6||on the 19th||141.0||on the 12th in 1953||113|
|Wallumbilla Post Office||82.4||on the 19th||69.6||on the 28th in 1942||112|
|Monto Township||68.0||on the 19th||64.4||on the 28th in 1983||70|
|Gladstone Radar||97.8||on the 19th||93.4||on the 25th in 1989||53|
|Highest total April rainfall for at least 20 years|
for April 2011 (mm)
|Most recent April
at least this wet
|Anakie Richardson St||101.0||227.8||in 1983||28||34.5|
|Glenlyon Dam||59.4||134.8||in 1990||21||36.3|
|Mt Perry The Pines||130.8||195.6||in 1990||21||56.9|
|Pacific Heights||261.8||448.2||in 1990||21||107.6|
|Rosedale Post Office||168.0||177.4||in 1990||21||69.3|
|Springbrook Road||273.9||551.5||in 1990||21||227.5|
|The Head||177.8||189.6||in 1990||21||81.4|
|Taroom Post Office||114.6||141.4||in 1990||20||35.6|
|Record lowest April daily maximum temperature|
in April 2011 (°C)
|Charleville Aero||15.5||on the 15th||= 15.5||on the 26th in 1983||70||28.1|
|Lowest April mean daily maximum temperature for at least 20 years|
for April 2011 (°C)
|Most recent April
at least this cool
|Clermont Sirius St||26.8||26.3||in 1941||65||29.5|
|Mornington Island||30.3||=30.3||in 1985||24||31.5|
|Baralaba Post Office||28.0||27.9||in 1983||23||30.4|
|Lowest April mean daily minimum temperature for at least 20 years|
for April 2011 (°C)
|Most recent April
at least this cool
|Boulia Airport||15.7||14.5||in 1978||33||17.1|
|Windorah Post Office||13.9||13.0||in 1978||33||16.1|
|Camooweal Township||15.3||14.9||in 1978||31||18.0|
|Summary statistics for April 2011|
|North Peninsula (district 27)|
|Coconut Island||31.1||-0.1||33.7||28th||25.1||-0.6||22.8||18th||546.4||165.6||v high||330%|
|Weipa Aero||31.8||-0.5||33.2||13th||23.2||+0.4||20.5||30th||321.6||106.8||v high||301%|
|South Peninsula (district 28)|
|Lockhart River Airport||29.2||-0.6||30.5||21st||22.9||0.0||19.7||30th||439.2||302.0||high||145%|
|Lower Carpentaria (district 29)|
|Burketown Airport||32.9||-1.4||34.7||21st||20.0||-1.9||16.4||19th||0||64.2||v low||0%|
|Julia Creek Airport||30.8||-4.0||33.8||15th||15.1||-2.7||10.2||12th||0.2||16.3||average||1%|
|Mount Isa Aero||29.6||-2.3||31.8||24th||16.1||-2.4||8.2||13th||6.8||15.5||average||44%|
|Upper Carpentaria (district 30)|
|Richmond Post Office||30.8||-1.9||34.2||15th||16.6||-0.4||12.4||30th||9.3||22.6||average||41%|
|Barron North Coast (district 31)|
|Low Isles Lighthouse||28.7||-0.7||30.9||22nd||24.1||0.0||22.8||29th||99.4||231.8||low||43%|
|Walkamin Research Station||26.3||-0.2||28.8||22nd||18.1||-0.1||14.7||16th||11.0||51.4||v low||21%|
|Herbert North Coast (district 32)|
|Cardwell Marine Pde||28.0||-1.2||29.2||7th||17.4||29th||68.8||210.1||low||33%|
|South Johnstone Exp Stn||27.7||-0.5||31.4||22nd||21.1||+0.7||18.4||16th||462.4||397.3||average||116%|
|East Central Coast (district 33)|
|Ayr DPI Research Stn||29.0||-0.5||31.7||21st||19.1||+0.1||15.4||29th||25.0||48.6||average||51%|
|Collinsville Post Office||28.7||-1.6||31.1||23rd||16.7||-0.3||11.8||30th||68.0||42.0||high||162%|
|Hamilton Island Airport||25.7||-1.3||27.3||24th||22.0||-0.7||19.0||29th||314.8||139.7||v high||225%|
|Mackay M.O||25.9||-0.8||27.5||14th||19.9||-0.3||16.1||30th||36.8||144.7||v low||25%|
|Samuel Hill Aero||26.4||-1.0||29.1||22nd||18.5||+0.5||14.5||30th||205.6||126.8||high||162%|
|St Lawrence Post Office||27.9||-1.4||31.0||22nd||18.5||+0.1||14.5||30th||40.7||59.3||average||69%|
|Yeppoon The Esplanade||25.9||-0.8||27.4||21st||19.3||-0.4||16.5||30th||159.0||70.4||high||226%|
|West Central Coast (district 34)|
|Charters Towers Airport||27.9||-2.4||30.9||22nd||17.6||-0.8||14.3||30th||66.2||29.4||high||225%|
|Central Highlands (district 35)|
|Clermont Sirius St||26.8||-2.7||30.5||14th||15.2||-0.5||10.5||30th||80.0||38.8||high||206%|
|Springsure Comet St||26.9||-2.1||29.9||22nd||14.7||-0.1||11.0||19th||71.6||40.1||high||179%|
|Tambo Post Office||27.7||-1.4||30.4||21st||10.9||-1.8||6.0||13th||20.4||37.3||average||55%|
|Taroom Post Office||27.7||-1.1||31.0||14th||14.1||0.0||11.0||17th||114.6||35.6||v high||322%|
|Central Lowlands (district 36)|
|Barcaldine Post Office||28.9||-1.1||32.9||15th||15.5||-1.3||10.9||12th||52.7||36.7||high||144%|
|Isisford Post Office||30.4||-0.3||33.9||14th||14.1||-1.9||8.0||12th||4.0||36.9||average||11%|
|Upper Western (district 37)|
|The Monument Airport||30.1||-2.6||33.0||14th||14.6||-2.8||8.7||13th||0.2||17.6||low||1%|
|Trepell Airport||29.9||-3.4||32.7||24th||14.3||-3.7||9.7||13th||0||16.9||v low||0%|
|Winton Post Office||30.4||-1.7||33.1||14th||16.6||-0.6||12.2||13th||5.2||22.4||average||23%|
|Lower Western (district 38)|
|Bedourie Police Station||28.9||-3.4||32.2||5th||17.2||-0.2||13.9||13th||1.3||10.0||average||13%|
|Birdsville Airport||29.1||-3.0||32.4||21st||15.5||-1.7||10.2||12th||0||1.3||v low||0%|
|Windorah Post Office||29.1||-1.1||32.0||1st||13.9||-2.2||9.0||12th||0.4||19.8||low||2%|
|Port Curtis South Coast (district 39)|
|Baralaba Post Office||28.0||-2.4||30.7||22nd||16.4||+0.4||13.2||30th||43.2||45.2||average||96%|
|Gladstone Radar||27.4||-1.0||29.7||22nd||19.2||-0.4||16.0||30th||107.6||48.7||v high||221%|
|Lady Elliot Island||26.2||-0.3||28.3||15th||22.0||+0.2||19.1||14th||82.2||102.7||average||80%|
|Monto Township||26.1||-1.6||29.0||23rd||14.5||+0.8||9.4||30th||94.8||44.8||v high||212%|
|Sandy Cape Lighthouse||26.2||-0.6||28.6||13th||20.2||+0.3||17.2||30th||158.0||121.2||high||130%|
|Moreton South Coast (district 40)|
|Beaudesert Drumley Street||25.9||29.6||21st||14.6||10.3||10th||78.2|
|Beerburrum Forest Station||25.7||-0.8||29.2||14th||16.3||+0.6||14.0||30th||132.2||115.5||high||114%|
|Cape Moreton Lighthouse||24.8||+0.6||26.7||21st||19.8||+0.7||17.2||29th||79.8||146.7||average||54%|
|Double Island Point Lighthouse||25.0||+0.1||28.9||11th||20.0||+0.2||17.4||28th||77.8||131.9||average||59%|
|Gold Coast Seaway||25.8||+0.1||28.4||14th||18.2||-0.1||16.7||28th||205.8||111.8||high||184%|
|Hervey Bay Airport||26.4||-0.5||28.4||15th||18.1||+0.2||15.2||30th||89.2||72.4||high||123%|
|Logan City Water Treatment Plant||25.6||-0.8||29.0||14th||16.6||+0.7||14.0||10th||151.0||78.9||v high||191%|
|Maleny Tamarind St||22.6||-1.0||26.4||14th||15.8||+0.9||13.8||30th||278.4||193.7||high||144%|
|Nambour DPI - Hillside||25.4||28.6||14th||17.2||15.5||10th||196.6|
|Sunshine Coast Airport||25.5||-0.3||27.7||11th||17.7||+0.8||16.2||28th||245.6||160.6||high||153%|
|Tewantin RSL Park||25.1||-0.7||28.0||14th||18.3||+0.3||16.4||28th||297.4||173.3||high||172%|
|University of Queensland Gatton||26.4||-0.7||29.5||21st||14.2||+0.5||10.3||13th||73.6||49.8||high||148%|
|East Darling Downs (district 41)|
|Stanthorpe Leslie Parade||20.9||-1.2||25.1||15th||10.5||+1.0||2.5||13th||44.2||42.3||average||104%|
|Texas Post Office||26.4||-1.2||30.1||3rd||11.9||+0.2||7.9||13th||60.2||34.2||high||176%|
|West Darling Downs (district 42)|
|Miles Constance Street||26.4||-1.6||29.6||15th||13.0||-0.4||9.1||13th||72.6||34.1||high||213%|
|Maranoa (district 43)|
|Injune Post Office||25.8||-1.9||29.6||22nd||11.3||-0.7||7.2||13th||118.2||42.6||high||277%|
|Mitchell Post Office||26.5||-1.0||29.8||1st||10.9||-0.6||5.3||12th||33.3||34.7||average||96%|
|St George Airport||27.4||-0.7||31.2||1st||13.0||-0.9||6.9||13th||32.6||20.8||high||157%|
|Warrego (district 44)|
|Bollon Mary St||27.8||0.0||33.2||1st||12.5||-0.7||6.0||24th||24.1||31.5||average||77%|
|Cunnamulla Post Office||27.9||0.0||32.7||1st||14.1||0.0||8.3||12th||1.0||27.5||low||4%|
|Far Southwest (district 45)|
|Ballera Gas Field||28.1||31.9||5th||9.5||12th||0||12.2||v low||0%|
|Offshore Islands (district 200)|
|Middle Percy Island||25.2||27.1||11th||20.6||17.5||19th||135.8||127.8||average||106%|
A Monthly Climate Summary is prepared to list the main features of the weather in Queensland using the most timely and accurate information available on the date of publication; it will generally not be updated. Later information, including data that has had greater opportunity for quality control, will be presented in the Monthly Weather Review, usually published in the fourth week of the month.
This statement has been prepared based on information available at 10 am on Tuesday 3 May 2011. Some checks have been made on the data, but it is possible that results will change as new information becomes available.
Averages are long-term means
based on observations
from all available years of record, which vary widely from site to
They are not shown for sites with less than 9 years of record, as they
cannot then be calculated reliably.
The median is sometimes more representative than the mean of long-term average rain.
The Rank indicates how rainfall
this time compares
with the climate record for the site,
based on the decile
ranking (very low rainfall is in decile 1,
low in decile 2 or 3,
average in decile 4 to 7, high
in decile 8 or 9 and very high is in decile 10).
The Fraction of average shows how much rain has fallen this time as a percentage of the long-term mean.