TELECONNECTION INDICES

MONTH NAO EA EA-

JET

WP
APR 99 -0.6 1.0 1.4 0.2
MAR 99 -0.4 -1.2 --- 0.3
FEB 99 1.8 -0.9 --- 0.8
JAN 99 1.3 -0.3 --- -0.2
DEC 98 1.0 1.0 --- 0.9
NOV 98 -0.7 0.9 --- 1.5
OCT 98 0.0 1.1 --- 0.0
SEP 98 -2.4 -0.6 -- -3.7
AUG 98 -0.5 --- 1.9 -1.5
JULY 98 -2.0 --- 1.6 -0.6
JUNE 98 -2.4 --- 1.2 -2.6
MAY 98 0.1 -- -1.3 2.2
APR 98 -0.2 1.1 2.1 1.6

Standardized amplitudes of selected Northern Hemisphere teleconnection patterns for the most recent thirteen months. Pattern names and abbreviations are: North Atlantic Oscillation (NAO); East Atlantic pattern (EA); East Atlantic Jet pattern (EA-JET); West Pacificn pattern (WP). No value is plotted when a pattern does not appear as a leading mode in that month.