Monday, 3 December 2012 - Monthly Climate Summary for Tasmania - Product code IDCKGC27R0
Tasmania in November 2012: Warm and dry, with tornadoes
Temperatures were very warm on the last two days of November, reaching into the mid-thirties in the east during the day and not dropping below 20 °C at night at some site. November was drier than average in most areas, particularly so across the western half of Tasmania. Three tornadoes were observed in the Hobart area on the 9th, though no damage was reported.
- A very warm finish
- Warmest November day on record at Strahan and Lake St Clair
- Warmest November night on record for some
- On the dry side, particularly in the west
- Unusual (but weak) tornadoes in the Hobart area
A hot finish after a cool start, and warm overall
The last 11 days of November were warmer than average in most areas, with this warmth culminating in summer-like heat on the last two days of the month. Although Tasmania mostly escaped the heatwave conditions across the southeast mainland, maximum temperatures approached the high twenties and low thirties on the 29th when both Strahan and Lake St Clair recorded their highest November temperature on record. On the 30th temperatures reached into the mid-thirties across the east, peaking at 34.2 °C at Orford, it's warmest November day in 30 years (since 24 November 1982).
In contrast, maximum temperatures were much cooler than average at the start of the month; most sites observed their coldest day of November on either the 1st, 2nd or 3rd. Mount Wellington's maximum of 2.4 °C on the 1st was the coldest day overall, with other areas in the southeast observing maximum temperatures up to 12 degrees below average.
Overall, maximum temperatures were up to one degree warmer than average in most areas, but were not as warm as in November last year.
Very mild night to end the month
The very warm air that was brought over Tasmania for the last two days of the month saw the temperature not drop below 15 °C at most sites on the morning of the 30th, remaining above 20 °C at some sites; both Strahan and Hobart stayed above 22 °C on the morning of the 30th. Although it was a very warm morning, minimum temperatures are measured over the 24 hours to 9 am. For many places the minimum occurred at 9 am on the 29th and that number has gone into the climate records. Cape Bruny, Dover, Strathgordon, Lake St Clair and Bull Bay all recorded their warmest November night (highest daily minimum temperature) on record on the 30th. Strahan Aerodrome's minimum of 19.3 °C was the warmest standard minimum of the month.
There were also a few cold nights during the month, with central parts of the state recording sub zero temperatures on the 3rd when Liawenee dropped to -4.5 °C.
Minimum temperatures were generally warmer than average overall.
Dry, especially in the west
November rainfall was below average in most areas of Tasmania and particularly so in the western half of the state, due to less rain-bearing cold fronts than usual. This continues a pattern seen in October, and is in stark contrast to the generally wet November last year. The wettest days clustered around the start of the month, generally associated with the passage of troughs of low pressure on the 1st, 5th, 8th and 9th. Thunderstorms on the 8th brought moderate falls to the southeast, with Birralee Creek recording 36 mm in the 24 hours to 9 am on the 9th, much of it falling in short bursts. Cold fronts around the 12th, 14th and 21st did see a few other wet days in the west, but daily rainfall totals tended to be less than 5 mm in other areas throughout the rest of the month.
The wettest overall was Mount Read with at least 191 mm (some snow is likely to have been lost), followed by Lake Margaret Power Station with 158 mm. New Norfolk (West) was the driest site with only 18 mm.
Tornadoes in Hobart, hail in the southeast
In a highly unusual event, at least three weak tornadoes were seen in the Hobart area on the 9th: one between the City and Mount Wellington just before 10 am, and two others over eastern suburbs around midday. The tornadoes were small and do not appear to have caused any damage, but they are quite rare: the last confirmed impact from a tornado around Hobart was in 1971. The same group of thunderstorms brought pea-sized hail to the southeast, with deep "drifts" of hail around Kingston and some instances of buildings being flooded when hail blocked roof guttering.
Warm and dry in Hobart
Hobart was almost 2 degrees warmer than normal by day, and 1 degree warmer than normal by night. The 29th and 30th were especially warm. Having dipped to 18.8 °C at 9 am on the 29th, it rose to 30.2 °C that afternoon. The night of the 29th/30th was very warm, with the temperature only falling to 22.1 °C around 6 am on the 30th, and by the afternoon of the 30th, it had reached 33.7 °C. The overnight minimum of 22.1 °C is not an "official" record, but the 18.8 °C is still Hobart's 4th-warmest November minimum. The 33.7 °C is well short of the record 36.8 °C on 26 November 1937.
Rainfall of 24.8 mm was about half the long-term average for November. 10 mm of that fell on the evening of the 8th, and a further 8 mm during the day on the 9th, when hail also fell across the city and some weak tornadoes were spotted.
|Extremes in November 2012|
|Hottest day||34.2 °C at Orford (Aubin Court) on the 30th|
|Warmest days on average||22.8 °C at Ouse Fire Station|
|Coolest days on average||11.4 °C at Mount Wellington|
|Coldest day||2.4 °C at Mount Wellington on the 1st|
|Coldest night||-4.5 °C at Liawenee on the 3rd|
|Coolest nights on average||2.9 °C at Liawenee|
|Warmest nights on average||12.2 °C at Swan Island|
|Warmest night||19.3 °C at Strahan Aerodrome on the 30th|
|Warmest on average overall||15.6 °C at Larapuna (Eddystone Point)|
|Coolest on average overall||7.3 °C at Mount Wellington|
|Wettest overall||191.2 mm at Mount Read*|
158.0 mm at Lake Margaret Power Station
|Driest overall||18.4 mm at New Norfolk (West)|
|Wettest day||35.6 mm at Birralee Creek on the 9th|
|Highest wind gust||135 km/h at Hogan Island on the 1st|
120 km/h at Maatsuyker Island Lighthouse on the 21st
* The true total at Mount Read is probably higher, as it is likely some snow was lost.
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|Record highest November temperature|
in November 2012 (°C)
|Lake St Clair National Park||28.7||on the 29th||28.0||on the 8th in 2009||23||15.5|
|Strahan Aerodrome||32.7||on the 29th||31.9||on the 22nd in 1997||22||17.8|
|Record highest November daily minimum temperature|
Highest daily minimum
in November 2012 (°C)
|Cape Bruny Lighthouse||17.7||on the 30th||17.2||on the 18th in 1978||56||9.0|
|Strathgordon Village||17.8||on the 30th||16.2||on the 3rd in 2005||31||7.1|
|Dover||17.2||on the 30th||16.2||on the 26th in 1991||23||7.8|
|Lake St Clair National Park||15.6||on the 30th||14.2||on the 30th in 2003||23||3.6|
|Bull Bay (Lauriston)||17.0||on the 30th||= 17.0||on the 27th in 1993||22||9.3|
|Summary statistics for November 2012|
|Northern (district 91)|
|Bridport (Sea View Villas)||18.4||0.0||23.0||30th||9.9||0.0||3.8||16th||29.8||52.9||low||56%|
|Burnie (Round Hill)||19.0||+1.2||25.8||30th||10.9||+1.2||5.6||13th||34.7||68.7||low||51%|
|Cape Grim BAPS (Comparison)||16.8||+0.8||22.0||30th||11.0||+0.4||7.7||3rd||47.0||53.8||average||87%|
|Cressy Research Station||20.8||+0.3||29.9||30th||6.7||-0.5||0.0||16th||31.6||52.7||low||60%|
|Launceston (Ti Tree Bend)||21.5||+1.1||28.1||30th||9.3||+0.3||3.2||13th||59.0||51.8||average||114%|
|Luncheon Hill (Forestry)||18.7||+1.4||25.5||30th||8.3||+0.7||3.6||3rd||64.8||93.7||low||69%|
|Scottsdale (West Minstone Road)||19.4||+0.6||27.7||30th||8.1||+0.3||1.2||16th||43.4||70.1||low||62%|
|Sheffield School Farm||18.7||+0.7||26.3||30th||7.9||+0.3||2.2||17th|
|East Coast (district 92)|
|Bicheno (Council Depot)||18.4||0.0||25.8||30th||10.5||+0.4||5.2||13th||54.4||58.5||average||93%|
|Fingal (Legge Street)||20.3||+0.7||31.6||30th||6.5||-0.6||0.6||17th||37.6||44.8||average||84%|
|Lake Leake (Elizabeth River)||16.9||+1.2||27.0||30th||5.4||0.0||-1.5||17th||27.7||63.7||low||43%|
|Larapuna (Eddystone Point)||20.0||+2.1||26.9||30th||11.3||+0.5||5.5||2nd||48.2||60.4||average||80%|
|Maria Island (Point Lesueur)||18.4||30.8||30th||11.2||6.4||3rd||31.8|
|Orford (Aubin Court)||19.2||+0.5||34.2||30th||9.7||+0.6||4.3||3rd||43.2||64.9||average||67%|
|St Helens Aerodrome||19.5||+0.2||29.1||30th||10.3||+0.1||5.5||2nd||44.8||70.6||average||63%|
|Swansea (Francis Street)||19.7||33.4||30th||8.9||3.4||3rd||28.2|
|Midlands (district 93)|
|Ross (The Boulevards)||21.0||+1.1||30.9||30th||6.6||-0.2||-2.2||17th||32.4||48.6||average||67%|
|Southeast (district 94)|
|Bull Bay (Lauriston)||18.7||+0.8||32.7||30th||10.1||+0.8||6.0||3rd||40.2||52.0||low||77%|
|Cape Bruny (Cape Bruny)||17.8||+1.0||28.6||30th||9.9||+0.3||7.1||2nd||76.6||55.6||high||138%|
|Cape Bruny Lighthouse||17.0||+1.4||28.4||30th||10.1||+1.1||5.8||2nd||73.4||75.3||average||97%|
|Dunalley (Stroud Point)||19.4||34.1||30th||10.8||6.1||3rd||25.8|
|Geeveston (Cemetery Road)||19.8||+1.5||29.2||30th||7.8||+0.2||1.7||3rd||49.8||70.0||low||71%|
|Grove (Research Station)||20.3||31.0||30th||7.1||0.3||3rd||45.0|
|Hobart (Ellerslie Road)||20.4||+1.7||33.7||30th||10.4||+1.1||4.1||3rd||24.8||54.1||low||46%|
|Maatsuyker Island Lighthouse||15.5||+1.1||26.2||29th||9.4||+1.0||5.8||1st||56.2||91.7||low||61%|
|Melton Mowbray (North Stockman)||20.4||+0.6||31.5||30th||7.3||-0.1||-0.1||3rd||41.2||42.1||average||98%|
|Tunnack Fire Station||17.8||+0.5||29.9||30th||6.2||+0.1||-2.5||3rd||63.4||62.3||average||102%|
|Derwent Valley (district 95)|
|Bushy Park (Bushy Park Estates)||22.2||+2.3||32.0||30th||7.6||+0.1||0.4||3rd||28.0||52.9||low||53%|
|Maydena Post Office||19.7||+1.7||30.6||29th||6.9||+0.4||-1.0||3rd||56.1||90.9||low||62%|
|Ouse Fire Station||22.8||+1.8||32.6||29th||7.0||-0.1||-0.7||3rd||19.8||40.3||low||49%|
|Central Plateau (district 96)|
|Butlers Gorge||17.0||+2.4||29.0||29th||4.6||+0.7||-2.7||3rd||62.2||138.5||v low||45%|
|Lake St Clair National Park||17.3||+1.8||28.7||29th||4.3||+0.7||-1.6||3rd||86.8||134.2||low||65%|
|West Coast (district 97)|
|Hartz Mountain (Keoghs Pimple)||15.2||+1.4||27.1||29th||5.1||+0.8||-0.4||3rd||60.0||74.3||low||81%|
|Low Rocky Point||17.7||26.1||29th||9.6||5.3||3rd||61.0||83.1||low||73%|
|Scotts Peak Dam||20.1||+2.5||33.8||29th||7.3||+0.4||2.0||3rd||87.8||98.4||average||89%|
|King Island (district 98)|
|King Island Airport||17.9||+0.5||23.7||24th||10.0||-0.1||5.2||19th||34.6||56.5||low||61%|
|Flinders Island (district 99)|
|Flinders Island Airport||19.7||+1.2||30.2||30th||10.1||-0.1||2.1||11th|
|Antarctica and Macquarie Island (district 300)|
A Monthly Climate Summary is prepared to list the main features of the weather in Tasmania 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 9 am on Monday 3 December 2012. 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 site.
They are not shown for sites with less than 10 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
(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.