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IRI Climate Digest July 2001

June Global Climate Summary

Climatological Background In June, the sun's maximum northward location is achieved at 23.6 degrees north. Surface heating of the continents has initiated summer monsoonal
systems or northern hemisphere warm season rains. In the Southern Hemisphere winter is
setting in with fewer daylight hours and cooler temperatures. The southern parts of South
Africa, Australia and South America are now in the path of mid latitude storm tracks.

Monthly Mean Temperature (1961-1990), data from the Climate Research Unit, University of East Anglia
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Monthly Mean Precipitation (1961-1990), data from the Climate Research Unit, University of East Anglia
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Unusually warm conditions continued to dominate much of eastern and central Asia as well as from the Caucasus eastward to Afghanistan. 

Europe:  The Iberian Peninsula was much warmer than average in June while near to slightly below average temperatures prevailed elsewhere.
Asia: Temperatures continued well above average across the Central Siberian Uplands while near average temperatures returned to central Russia after an unusually warm May.  Temperatures were well above average across north-central China eastward to the Korean Peninsula and Japan.
Africa:  From Senegal northward to Morocco, areas along the Atlantic coast of West Africa were much warmer than average in June. 
Australia:  In contrast to the previous month, much of eastern Australia was unseasonably warm in June from Queensland southward to New South Wales.
North America:  Unusually warm conditions persisted across much of the southwestern United States.  Eastern Canada continued to be unseasonably warm while southern sections of Alaska saw an abrupt shift to above average temperatures in June. 
South America:  In northern Argentina and much of Paraguay June brought unseasonably warm conditions.

Temperature Difference from the 1961-1990 mean, with data from NCEP Climate Prediction Center, CAMS.
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June marked a vigorous onset to the summer monsoon in southern Asia and some limited drought relief to northern Pakistan.  Rainfall continued to be well below average across southwest Australia and New Zealand. 

Asia: A vigorous, and early, onset of the South Asia summer monsoon brought much needed rainfall to sections of drought-stricken northern Pakistan and above-average precipitation to most of central and northern India.  Above average rainfall across eastern sections of the North China Plain helped ease drought conditions although western areas continued to be unusually dry.  Beneficial rains fell across much of South Korea helped to ease unusually dry conditions there.
Africa:  Near average rainfall fell across much of the Sahel in West Africa, although unusually dry conditions continued across portions of southern and central Senegal and Guinea Bissau.  In East Africa rainfall was somewhat above average across southern and western Kenya as well as Uganda.  Unusually dry conditions were observed across much of southern Ethiopia.
South America:  Heavy rainfall fell across much of Uruguay and northern Brazil.  Much of Colombia and western Venezuela were unusually dry in June.
North and Central America:  Unusually wet conditions prevailed along the east and Gulf coasts of the United States as well as most of eastern Canada.  Precipitation was well below average across south-central Alaska.  Rainfall was well below average across much of Mexico and Central America.
Europe: Unseasonably dry across the Iberian Peninsula and the Mediterranean coast. 
Australia and New Zealand: Rainfall continued below average across southwestern West Australia as well as Coastal Queensland and New South Wales.  Above average rainfall fell across interior sections of South Australia.

Precipitation Difference from 1961-1990 mean, with data from NCEP Climate Prediction Center, CAMS-OPI.
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Oceanic Conditions

Tropics:   Sea surface temperatures (SSTs) remained near average across the central and eastern equatorial Pacific while below average SSTs persisted along coastal waters of western South America.  Overall, there has been little change in the equatorial Pacific from the previous month and most numerical prediction models are predicting near-neutral to slightly warmer than average conditions to continue over the next 6 to 9 months. 

Much of the tropical Indian Ocean continues to be warmer than average while SSTs in the tropical Atlantic are slightly warmer than average in the tropical North Atlantic and in the Gulf of Guinea.

Mid latitudes:  In the North Pacific, unusually warm waters cover much of western areas at low latitudes with below average SSTs located across much of the north.  In the South Pacific, above average SSTs continue to the east of Australia and in central sections.  In the North Atlantic, a broad band of above average SSTs extended from the West Indies northeastward to Europe.

Monthly Sea Surface Temperature Difference from the 1950-1979 mean, with data from the Environmental Modeling Center, NCEP/NOAA.
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Material for this Global Climate Summary has been extracted from the IRI Climate Data Library, the NOAA NCEP Climate Prediction Center, the Climate Diagnostics Center, and the NOAA ERL Pacific Marine Environmental Laboratories. Additional information has been obtained from the Bureau of Meteorology, Australia, and CPTEC, Brazil

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