I am a bit confused here. If you read the whole paragraph in the link, it appears to contradict itself. Can somebody clue me in? Is this a roundabout way to say cooler fall and winters after a dry, hot summer?
A warm-phase ENSO event, or El Niño, strengthens the subtropical jet stream and typically keeps it just to our south, which means a moisture-rich storm track through the Gulf of Mexico and off our coast. South-central Texas and the southeast US will be mostly cool and wet because the cold, moist air from the Pacific Ocean entering the southern states enhances clouds and rainfall and cools temperatures due to lack of direct sunlight. In turn, much of the northern United States and Canada will be warm during an El Niño event because the polar jet stream swings farther east over the northeastern United States. For much of the southeastern United States during the summer of an El Niño event, the climate is usually warmer and drier.
(emphasis mine)