OLR: outgoing long wave radiation

wiki, GOES-R, NOAA,

Outgoing Longwave Radiation (OLR) data at the top of the atmosphere are observed from the Advanced Very High Resolution Radiometer (AVHRR) instrument aboard the NOAA polar orbiting spacecraft. Data are centered across equatorial areas from 160°E to 160°W longitude. The raw data are converted into a standardized anomaly index. Negative (Positive) OLR are indicative of enhanced(suppressed) convection and hence more (less) cloud coverage typical of El Niño (La Niña) episodes.More (Less) convective activity in the central and eastern equatorial Pacific implies higher (lower),colder (warmer) cloud tops, which emit much less (more) infrared radiation into space. More information can be found at the Climate Prediction Center OLR page.

Outgoing Longwave Radiation (OLR) Last 12 Months (W/m²)

NOV 2013	DEC 2013	JAN 2014	FEB 2014	MAR 2014	APR 2014	MAY 2014	JUN 2014	JUL 2014	AUG 2014	SEP 2014	OCT 2014
+0.8	+0.9	+0.4	+0.2						+0.4	+0.2
				-1.1	-1.0	-0.1	-0.7	-0.1			-0.1

Source: http://www.cpc.ncep.noaa.gov/data/indices/olr

Outgoing Longwave Radiation (OLR)
Period of Record Time series