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Climate Diagnostics Bulletin
Climate Diagnostics Bulletin - Home Climate Diagnostics Bulletin - Tropics Climate Diagnostics Bulletin - Forecast

 

  Extratropical Highlights

  Table of Indices  (Table 3)

  Global Surface Temperature  E1

  Temperature Anomalies (Land Only)  E2

  Global Precipitation  E3

  Regional Precip Estimates (a)  E4

  Regional Precip Estimates (b)  E5

  U.S. Precipitation  E6

  Northern Hemisphere

  Southern Hemisphere

  Stratosphere

  Appendix 2: Additional Figures

Extratropical Highlights

JULY 2019

1

Extratropical Highlights –July 2019

 

1. Northern Hemisphere

The 500-hPa circulation during July featured above-average heights over Alaska, the northeastern U.S., and Greenland, and below-average heights over the central North Atlantic and western Russia (Fig. E9). The main land-surface temperature signals included above-average temperatures in Alaska, the southwestern and eastern U.S., and southern Europe (Fig. E1). The main precipitation signals included above-average totals in southern China, and below-average totals in the northeastern and mid-Atlantic regions of the U.S. (Fig. E3).

 

a. North America

The 500-hPa circulation during July featured above-average heights over Alaska and the northeastern U.S. (Fig. E9). This pattern contributed to above-average surface temperatures in Alaska and in the eastern U.S. (Fig. E1). Much of Alaska recorded temperatures in the upper 90th percentile of occurrences.

Also during July, below-average precipitation was recorded in the northeastern and mid-Atlantic regions of the U.S. (Fig. E3). Area-averaged totals in both regions were in the lowest 20th percentile of occurrences (Fig. E5).

 

2. Southern Hemisphere

The 500-hPa height field during July featured above-average heights over southern Australia, the central South Pacific, the high latitudes of the South Atlantic, and the eastern Indian Ocean. It also featured below-average heights over the high latitudes of the eastern South Pacific and in the area south of Africa (Fig. E15). In southern Australia, the above-average heights contributed to anomalously warm (Fig. E1) and dry (Fig. E3) conditions, with many locations recording rainfall totals in the lower 30th percentile of occurrences.

 


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