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 July 2024

- The monthly anomaly of the average temperature over Japan was +2.16°C (the warmest for July since 1898). Monthly precipitation amounts were significantly above normal on the Sea of Japan side of northern Japan.
- Convective activity was enhanced from the North Indian Ocean to the western equatorial Pacific, indicating active Asian summer monsoon circulation.
- The subtropical jet stream from Japan to the east shifted northward from its normal position.
- In the sea level pressure field, positive anomalies were seen from the south of Japan to the central North Pacific, indicating enhanced westward expansion of the North Pacific Subtropical High. Warm air frequently flowed into northern Japan along with the periphery of the North Pacific Subtropical High and warm air frequently covered eastern/western Japan and Okinawa/Amami. These conditions resulted in record high temperature over Japan.
- Tropospheric thickness temperatures over the Northern Hemisphere mid-latitudes and the tropics were both record high.

Full version (PDF)

Monthly Highlights on the Climate System (July 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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