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Monthly Weather Review Australia September 2020

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Monthly Weather Review Australia September 2020 Monthly Weather Review Australia September 2020 The Monthly Weather Review - Australia is produced by the Bureau of Meteorology to provide a concise but informative overview of the temperatures, rainfall and significant weather events in Australia for the month. To keep the Monthly Weather Review as timely as possible, much of the information is based on electronic reports. Although every effort is made to ensure the accuracy of these reports, the results can be considered only preliminary until complete quality control procedures have been carried out. Any major discrepancies will be noted in later issues. We are keen to ensure that the Monthly Weather Review is appropriate to its readers' needs. If you have any comments or suggestions, please contact us: Bureau of Meteorology GPO Box 1289 Melbourne VIC 3001 Australia [email protected] www.bom.gov.au Units of measurement Except where noted, temperature is given in degrees Celsius (°C), rainfall in millimetres (mm), and wind speed in kilometres per hour (km/h). Observation times and periods Each station in Australia makes its main observation for the day at 9 am local time. At this time, the precipitation over the past 24 hours is determined, and maximum and minimum thermometers are also read and reset. In this publication, the following conventions are used for assigning dates to the observations made: Maximum temperatures are for the 24 hours from 9 am on the date mentioned. They normally occur in the afternoon of that day. Minimum temperatures are for the 24 hours to 9 am on the date mentioned. They normally occur in the early morning of that day. Mean temperatures are the average of the daily maximum and daily minimum temperatures. Daily rainfall is for the 24 hours to 9 am on the date mentioned. This means a significant fraction of the rain may have occurred on the previous calendar day. Monthly rainfall is for the period from 9 am on the last day of the previous month to 9 am on the last day of this month. Maximum daily wind gusts are in the 24 hours from midnight to midnight. Climatological values The climatological averages shown in the text and tables are generally long-term means based on observations from the years 1961–1990. They are not shown for sites with less than 25 years of record in that time, as they cannot then be calculated reliably. Climatological extremes are generally taken from all available years of record; the number of years can vary markedly from site to site. Records The tables of records are not exhaustive, as they only show sites with at least 30 years of record. This may exclude locations where a new site has been established; this means even some major cities and towns may not be listed. Maps The temperature and rainfall maps are intended to give an overview of the country. There could be discrepancies between the values shown on these maps and those at individual locations, as a result of the way the maps are generated. A wide range of maps of rainfall, temperature and other variables, covering the whole country and smaller regions can be found at www.bom.gov.au/climate/maps. Accessing data Tables of daily values for selected sites are included toward the back of the Monthly Weather Review. Data from many more sites and for other times are available from www.bom.gov.au/climate/data/. Copyright © Commonwealth of Australia 2020 This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced without prior written permission from the Bureau of Meteorology. Requests and enquiries concerning reproduction and rights should be addressed to: Publishing Unit, Bureau of Meteorology, GPO Box 1289, Melbourne VIC 3001 Product code IDCKGC11R1. Prepared on 26 October 2020 Cover photograph Snow falling on the Stevenson screen (which houses the thermometers) at Lake St Clair. Photograph by Maren Goerne (Visitor Reception Officer, Lake St Clair National Park), 9 am on 16 August 2010. Used with permission. Overview • Australia's second-warmest September on record in the north-west, and overall Australia's overall second-warmest September days on record • Mean minimum temperatures were very much • September rainfall was close to average for warmer than average for most of the country and Australia overall overall it was Australia's warmest September • It was below average rainfall in the south-west and nights on record south-east, but above average rainfall for large • Mean maximum temperatures were very much areas of the Northern Territory, central and warmer than average for most of the western western Queensland, western New South Wales, two-thirds of the country, and warmest on record pastoral South Australia, and the north-east Kimberley in Western Australia Areal averages in September 2020 Rainfall anomaly Mean maximum Mean minimum Mean temperature temperature anomaly temperature anomaly anomaly Australia −0.3% +2.62 °C +2.51 °C +2.57 °C 2nd-highest highest 2nd-highest Western Australia −34% +2.75 °C +1.99 °C +2.37 °C equal 2nd- highest highest highest Northern Territory +13% +3.28 °C +3.28 °C +3.28 °C 2nd-highest highest 2nd-highest South Australia +46% +2.99 °C +2.64 °C +2.82 °C equal 4th-highest 2nd-highest 2nd-highest Queensland +27% +2.08 °C +3.08 °C +2.58 °C 9th-highest 3rd-highest 2nd-highest New South Wales −3% +2.27 °C +2.08 °C +2.18 °C 5th-highest 4th-highest Victoria −22% +1.58 °C +1.03 °C +1.31 °C 10th-highest 6th-highest Tasmania −21% +0.70 °C +0.56 °C +0.63 °C 1 Monthly Weather Review - Australia - September 2020 Extremes in September 2020 Hottest day Coldest night Wettest day Warmest overall Coolest overall Wettest overall Strongest wind gust Australia 41.8 °C −8.1 °C 170.0 mm 31.7 °C 1.9 °C 645.0 mm 146 km/h at Mandora (WA) at Perisher Valley at Bellenden Ker at Argyle at Thredbo AWS at Bellenden Ker at Maatsuyker on the 14th AWS (NSW) on the Top Stn (Qld) on the Aerodrome (WA) (NSW) Top Stn (Qld) Island Lighthouse 1st and Thredbo 18th (Tas.) on the 14th AWS (NSW) on the 26th Western 41.8 °C −1.0 °C 60.4 mm 31.7 °C 12.3 °C 197.1 mm 119 km/h Australia at Mandora on the at York on the 11th at Collie East on the at Argyle at Bridgetown and at Pemberton at Kununurra Aero 14th 7th and Huntly on Aerodrome Wandering on the 30th the 7th Northern 40.8 °C 5.0 °C 77.6 mm 31.4 °C 21.8 °C 118.2 mm 83 km/h Territory at Victoria River at Arltunga on the at Dum In Mirrie at Bradshaw at Arltunga at Charles Darwin at Walungurru Downs on the 20th 2nd Airstrip on the 25th University Airport on the 17th South 38.6 °C −2.1 °C 98.5 mm 21.9 °C 10.8 °C 147.2 mm 104 km/h Australia at Nullarbor on the at Murray Bridge at Mount Eba on at Oodnadatta at Mount Lofty at Piccadilly at Cape 10th (Pallamana the 19th Airport (Woodhouse) Willoughby on the Aerodrome) on the 1st 1st Queensland 40.5 °C −3.8 °C 170.0 mm 29.0 °C 13.5 °C 645.0 mm 102 km/h at Julia Creek at Applethorpe on at Bellenden Ker at Normanton at Applethorpe at Bellenden Ker at Thargomindah Airport on the 21st the 27th Top Stn on the 18th Airport Top Stn Airport on the 21st New South 34.7 °C −8.1 °C 68.0 mm 20.1 °C 1.9 °C 139.4 mm 128 km/h Wales at Menindee Post at Perisher Valley at Meldrum at Tibooburra at Thredbo AWS at Careys Peak at Thredbo AWS Office on the 8th AWS on the 1st and (Coolawarrah) on Airport (Barrington Tops) on the 8th and Wilcannia Thredbo AWS on the 11th Aerodrome AWS on the 26th the 8th Victoria 29.6 °C −6.9 °C 47.0 mm 15.7 °C 2.3 °C 149.6 mm 117 km/h at Mildura Airport at Mount Hotham at Dromana Sussex at Mildura Airport at Mount Hotham at Grampians at Wilsons on the 18th on the 26th Farm on the 13th (Mount William) Promontory Lighthouse on the 26th Tasmania 23.4 °C −7.5 °C 74.0 mm 12.3 °C 2.9 °C 349.6 mm 146 km/h at Bushy Park at Liawenee on the at Mount Read on at Friendly Beaches at Mount Read at Mount Read* at Maatsuyker (Bushy Park Estates) 1st the 23rd and Hogan Island Island Lighthouse on the 7th and larapuna on the 14th (Eddystone Point) In this table Hottest day is the highest daily maximum temperature, Coldest night is the lowest daily minimum temperature, Wettest day is the highest daily rainfall total, Warmest overall is the highest mean monthly temperature, Coolest overall is the lowest mean monthly temperature and Wettest overall is the highest total monthly precipitation. *note: true precipitation should be higher due to undercatch of snow in strong winds and missing rainfall on the 12th 2 Monthly Weather Review - Australia - September 2020 Significant weather Western Australia and 13th; York's minimum temperature of −1.0 °C on the 11th was the lowest temperature in WA for the Widespread rainfall and a possible tornado in month. Perth suburb A cold front produced widespread rainfall above South Australia 25 mm across south-west Western Australia with Heavy rainfall and snow isolated totals of almost 60 mm on the 7th.
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