Skip Navigation Links www.nws.noaa.gov 
NOAA logo - Click to go to the NOAA home page National Weather Service   NWS logo - Click to go to the NWS home page
Climate Prediction Center

 
 

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

AUGUST 2016

1

Extratropical Highlights ľAugust 2016

 

1. Northern Hemisphere

The 500-hPa circulation during August featured above-average heights over the high latitudes of both the western and eastern North Pacific, the northeastern U.S., Europe, and western Russia, and below-average heights over the central North Atlantic and the polar region (Fig. E9). This overall pattern projected strongly onto several teleconnection patterns, including the positive phase of the East Atlantic (+2.1) and Polar/Eurasia (+2.4) patterns and the negative phase of the North Atlantic Oscillation (NAO, -2.2) and East Atlantic/ West Russia (-3.3) pattern (Table E1, Fig. E7).

The main land-surface temperature signals during August included above-average temperatures in Alaska, western Canada, the eastern U.S., Europe, western Russia, and China (Fig. E1). The main precipitation signals included above-average totals in the southern and central U.S., and below-average totals in the Pacific Northwest and northeastern U.S. (Fig. E3).

 

a. North America

The 500-hPa circulation during August featured above-average heights over the Gulf of Alaska and the northeastern U.S., along with a broad trough across central North America (Fig. E9). This pattern was associated with above-average surface temperature in Alaska, western Canada, and the eastern U.S. (Fig. E1), with departures exceeding the 90th percentile of occurrences in both southwestern Alaska and the eastern U.S.

Precipitation during August was above average across the southeastern and central U.S. (Fig. E3), with area-average totals exceeding the upper 90th percentile of occurrences in the Great Plains, Midwest, and Gulf Coast regions (Fig. E5). Precipitation was below average in the Pacific Northwest and northeastern U.S., with monthly totals in both areas falling into the lowest 10th percentile of occurrences.

According to the U.S. Drought Monitor, exceptional or extreme drought continued across central and southern California during August. Extreme drought also persisted in portions of northern Georgia and northeastern Wyoming, and developed in western New York and portions of New England. Severe drought was evident in eastern Oregon, western Nevada, and northern Mississippi. Moderate drought was evident in eastern Oregon, the southern half of New Mexico, and western Arizona.

 

b. Europe/ western Russia

The 500-hPa circulation during August featured above-average heights over Europe and western Russia, and below-average heights over the central North Atlantic and the polar region (Fig. E9). This pattern projected strongly onto several teleconnection patterns, including the positive phase of the East Atlantic (+2.1) and Polar/Eurasia (+2.4) patterns and the negative phase of the North Atlantic Oscillation (NAO, -2.2) and East Atlantic/ West Russia (-3.3) pattern (Table E1, Fig. E7).

This overall pattern was associated with a continuation of above-average surface temperatures across Europe and western Russia, with the most significant departures exceeding the 90th percentile of occurrences in western Russia (Fig. E1). Western Europe also recorded below-average precipitation during August, with totals in some locations falling into the lowest 10th percentile of occurrences.

 

 

c. Northern Africa

The West African monsoon season, which lasts from June-September, has been well above average so far this year (Fig. E3). Area-averaged totals were above average during June, July, and August, with the June and July totals nearing the 100th percentile of occurrences (Fig. E4).

 

2. Southern Hemisphere

The mean 500-hPa circulation during August featured above-average heights over Antarctica and south of Australia, and below-average heights over the high latitudes of the South Pacific and the central South Atlantic Ocean (Fig. E15). Surface temperature signals during August included above-average temperatures in southern South America and South Africa (Fig. E1).

 

The Antarctic ozone hole typically develop rapidly during August and reaches its peak size in September. The ozone hole then gradually decreases during October and November, and dissipates in early December (Fig. S8). During August 2016, the ozone hole intensified and reached 15 million square kilometers by the end of the month. This size is roughly the average for the 2006-2015 period.

 

 

 

 


NOAA/ National Weather Service
NOAA Center for Weather and Climate Prediction
Climate Prediction Center
5830 University Research Court
College Park, Maryland 20740
Page Author: Climate Prediction Center Internet Team
Page Last Modified: September 2016
Disclaimer
Information Quality
Credits
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities