Monthly Highlights on the Climate System

'Monthly Highlights on the Climate System' has been issued in PDF format since March 2007 as a monthly bulletin focusing on the monthly highlights of the monitoring results.

Highlights in June 2024

- Monthly mean temperatures were significantly above normal in northern/eastern Japan, and were above normal in western Japan and Okinawa/Amami, Monthly precipitation amounts were significantly below normal on the Pacific side of northern Japan. On the other hand, monthly precipitation amounts were significantly above normal on the Pacific side of eastern Japan and in Okinawa/Amami.
- Convective activity was enhanced from Indonesia to India, and suppressed in and around the Arabian Sea and in a wide area of the tropical Pacific. The subtropical jet stream shifted southward from its normal position from the Middle East to East Asia, corresponding to the delay in the climatological northward progression of the Baiu-front.
- In the lower troposphere, anti-cyclonic circulation anomalies were seen in the subtropical North Pacific, effectively bringing humid air to the Baiu-front.
- In the 500-hPa height field, negative anomalies over the Sakhalin, and positive anomalies were also seen over wide areas in the mid-latitude including Japan. These atmospheric conditions resulted in above normal temperatures over a wide area of Japan.

Full version (PDF)

Monthly Highlights on the Climate System (June 2024)
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The descriptions from May-2011 to April-2021 issue are based on the former climatological normal (1981-2010 average).
In the descriptions until April-2011 issue, 1979-2004 average is used as climatological normal unless otherwise stated.
The descriptions until January-2014 issue are based on the JRA-25/JCDAS datasets.
The descriptions from February-2014 to April-2023 issue are based on the JRA-55 reanalysis.

Figures and Tables

Notice: Products based on JRA-3Q were updated to those with improved quality in terms of tropical cyclone analysis. OLR-related products from January 1991 are based on NOAA CPC Blended OLR (CBO).

Notice: Figures of 'Atmospheric Circulation', 'Time Cross Section', and 'Indices' have been revised with improved quality data regarding tropical cyclone analysis. (18 June 2024)

Notice: Depending on the availability of NOAA CPC Blended OLR (CBO) data, updates may be delayed or figures may be filled with gray indicating data missing.

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Tokyo Climate Center, Climate Prediction Division.
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