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Climate Update 1919 The Island 9 April 2002 Climate Update An overview of the present climate in the tropical South Pacific, with an outlook for the coming months, to assist in dissemination of climate information in the Pacific region. Produced by the National March’s climate Institute of Water and An extensive area of enhanced convection occurred over equatorial waters about and west of the Atmospheric Research, date line, from Papua-New Guinea to Western Kiribati, with another convective band associated with New Zealand. a southward displacement of the South Pacific Convergence Zone (SPCZ) extending from the northern Coral Sea southeast to affect Vanuatu and New Caledonia. The SPCZ continued to be more active than usual over southern French Polynesia. Rainfall was more than 200% of average in parts of New Caledonia and southern French Polynesia. Heavy rainfall occurred in New Caledonia during the passage of tropical cyclone ‘Des’, the only occurrence in March, which reached storm force as it Contributors tracked southeast from 5 through 7 March. Dry, sunny conditions prevailed over northern Fiji, much of Tuvalu, Tokelau and many islands in northern French Polynesia. Rainfall less than 50% of average Australian Bureau of continued on the Queensland coast of Australia, extending into the western Coral Sea. March was Meteorology unusually warm in Fiji with mean air temperatures at least 1.5ºC above average at some sites. Meteo France More on Page 2. Fiji Met Service European Centre for Medium Range Forecasting, ECMWF NOAA Climate Prediction Centre UK Meteorological Office International Research Institute for Climate Prediction, IRICP World Meteorological Organisation, WMO Outgoing Long-wave Radiation (OLR) anomalies, in Wm-2 , for February 2002 represented by shaded areas, and rainfall percentage of average, shown by numbers. High radiation levels (yellow) are typically associated with clearer skies and lower rainfall, while cloudy conditions lower the OLR (blue) and typically mean higher rainfalls. The March 2002 position of the South Pacific Convergence Zone (SPCZ), as identified from total rainfall, is indicated by the solid green line. The average SPCZ position is identified by the dashed green line. Data source: NOAA-CIRES Climate Diagnostics Center. ENSO and sea surface temperatures Based on recent observations in the equatorial Pacific, the likelihood of an El Niño developing this year has increased. The equatorial Pacific Ocean is warmer than average especially near South America, the Southern Oscillation Index became negative this month, and enhanced rainfall has been observed off the west coast of South America near Ecuador. The forecast models show a strong consensus. The last El Niño event occurred in 1997/98. The next few months will be critical to the development of an El Niño episode. Details Page 2. The next three months (April to June 2002) Above average rainfall is likely in Kiribati and Vanuatu, with average to above average totals in New Caledonia, Fiji, Niue and Pitcairn Island. Average to below average rainfall is expected in many areas from the Solomon Islands east to the Marquesas including the Northern Cook Islands and central French Polynesia. More on Page 3. SPREP 1 CLIMATE EXTREMES IN MARCH 2002 Climate Country Location Rainfall (mm) % of normal Comments developments in New Caledonia Ile Art, Belep 612 283 Highest March 2002 French Polynesia Tubuai 574 253 Highest Fiji Matei Airfield 44 4 Lowest Active convection over Country Location Mean Departure Comments equatorial waters about and air temperature, ºC from average Fiji Rotuma 28.6 +1.5 Highest west of the date line Fiji Nabouwalu 28.5 +1.9 Highest High rainfall in parts of New French Polynesia Bora bora 29.5 +1.6 Highest Caledonia and southern French French Polynesia Rikitea 26.5 +0.8 Highest Polynesia Country Location Extreme air temperatures, ºC Comments Low rainfall from Tuvalu to French Polynesia Hao Extreme daily maximum 32.9 New record northern French Polynesia Fiji Viwa Highest overnight min. 28.3 New record An extensive area of enhanced convection average in parts of New Caledonia and southern Tuvalu, Tokelau and many islands in northern occurred over equatorial waters about and west of French Polynesia, some sites recording more than French Polynesia. Below normal rainfall (less than the date line, from Papua-New Guinea to Western 400 mm. Rainfall totalling more than 100 mm 50% of average) continued on the Queensland coast Kiribati, with another convective band associated was measured in many parts of New Caledonia of Australia, extending into the western Coral Sea. with a southward displacement of the SPCZ during the passage of tropical cyclone ‘Des’ to the Willis Island, off the Queensland coast, has now extending from the northern Coral Sea southeast southwest from 5 through 7 March. Aoupinié recorded 8 consecutive months with less than 75% to affect Vanuatu and New Caledonia. The SPCZ recorded 275 mm on 6 March and 390 mm in two of average rainfall. was situated near its average position about and days. Some flooding occurred although not major. High mean March air temperatures (1.0ºC or more east of the date line, but was more active than Further high rainfall (at least 100 mm) also occurred above average), associated with warmer than usual over southern French Polynesia (where wet in northern and eastern parts of New Caledonia average sea surface temperatures, were measured conditions continued). Rainfall was at least 125% from 14-15 and 22-24 March. in Fiji and northern and central French Polynesia. of average at many locations within these Sunny conditions, with less than 75% of average Air temperatures were near average in convective regions, but more than 200% of rainfall, prevailed over northern Fiji, much of New Caledonia. Conditions are set for the (to -0.8) in March, from weakly positive values In the tropical Southwest Pacific, a very extensive development of an El Niño over the previous two months. The March OLR area of much warmer than usual water at the data showed extensive positive anomalies surface (at least 1.0ºC above average) extends from Warmer than average seas (indicating decreased convection) from Sumatra New Caledonia through to the region well east of across the whole of the tropical in Indonesia across northern Australia to the Pitcairn Island, encompassing most islands Southwest Pacific western Coral Sea, while enhanced convection and between 15 and 25ºS. A region of positive SST high rainfall was observed off the west coast of anomaly (of at least 1.0ºC above average) is well The likelihood of an El Niño developing this year, South America near Ecuador. The global forecast established around Western Kiribati. The based on recent observations in the equatorial models show a strong consensus. All these factors warmest surface waters (30-31ºC) extend from Pacific, has increased. The equatorial Pacific point to an increased likelihood of an El Niño northern Vanuatu across to Samoa. Sub-surface Ocean temperatures are becoming warmer than developing. There are no significant anomalies in sea temperature observations show positive average especially near South America where the Pacific equatorial trade winds at this stage. anomalies from 160ºW to the coast of South anomalies now exceed +1.0ºC, The Southern The next few months will be critical to the America, with the (relatively) warmest water near Oscillation Index showed a substantial fall development of an El Niño episode. 50 m depth in the far east at 100-120ºW. Sea surface temperature anomalies (°C) for March 2002 Mean sea surface temperatures (°C) for March 2002 The SPCZ was expected to be more active than This scenario was correct for many islands. usual and also further north than average of its However, the SPCZ was further south than Forecast normal location. Rainfall was expected to be predicted resulting in lower than expected validation average to above average in equatorial latitudes rainfall in the Tokelaus, Wallis and Futuna, from Western Kiribati southeast to Tonga and Niue, Northern Cook Islands and Samoa and higher than including Tuvalu, Wallis and Futuna, and Samoa. forecast rainfall in areas of Papua-New Guinea, Forecast period: Average to below average rainfall was expected in New Caledonia, Fiji and the Austral Islands. Vanuatu, Eastern Kiribati, the Society Islands, and Mixed rainfall patterns occurred over Vanuatu. January to March 2002 the Southern Cooks, with below average rainfall The overall ‘hit rate’ for the January to March in the Marquesas. Average rainfall was expected rainfall outlook was about 65%. in most other areas. 2 Rainfall outlook: April to June 2002 Average to below average rainfall from the Solomon Islands to the Marquesas, including the Northern Cook Islands and central French Polynesia Above average rainfall in Kiribati and Vanuatu Mainly average rainfall in other areas Rainfall outlook map for April to June 2002 The South Pacific Convergence Zone Western and Eastern Kiribati and Vanuatu, including the Northern Cooks, and central moved south in March, lying over Fiji, and average to above average in New French Polynesia. Average rainfall is more Tonga and the Southern Cook Islands: Caledonia, Fiji, Niue and Pitcairn Island. likely in other areas. Forecast skill for displaced further to the southwest than Average to below average rainfall is most rainfall outlook models is usually usual in areas west of the dateline. Rainfall projected for much of the region from the lowest at the onset of the South Pacific is projected
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