'Seasonal Highlights' has been issued in PDF format since spring 2007 as a seasonal bulletin focusing on the seasonal highlights of the monitoring results. For monthly information, please refer to 'Monthly Highlights on the Climate System.'
Highlights in Summer (June 2024 - August 2024)
- Convective activity was enhanced from eastern North Africa to the western Indian Ocean, from western South Asia to Indonesia and to the southeast of Japan.
- In association with enhanced convection from the Indian Ocean to the Pacific, the southwestward extension of the North Pacific subtropical high was stronger than normal.
- In the 500-hPa height field in the Northern Hemisphere, the polar vortex was shifted toward the western hemisphere, and positive anomalies were seen over northern Eurasia. Positive anomalies were also seen in a wide area of mid-latitudes. Tropospheric thickness temperatures over the Northern Hemisphere mid-latitudes were record high.
- Seasonal mean temperatures were significantly above normal nationwide in Japan, because warm air covered nationwide. Seasonal mean temperatures were the highest in western Japan and Okinawa/Amami and tied with 2023 as the highest in eastern Japan on record for summer since 1946. The seasonal anomaly of the average temperature over Japan was +1.76°C, tied with 2023 as the warmest for the season since 1898.
The descriptions from Spring-2011 to Winter-2021 issue are based on the former climatological normal (1981-2010) unless otherwise stated.
In the descriptions until Winter-2011 issue, 1979-2004 average is used as climatological normal unless otherwise stated.
The descriptions until Autumn-2013 issue are based on the JRA-25/JCDAS datasets.
The descriptions from Winter-2014 to Winter-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.
