Hot, dry conditions in the Midwest may be a symptom of an emerging La Nina. After months of weakening, the La Nina footprint has re-emerged in the United States. It is hard to know if this is a short-term fluctuation or a resurgent La Nina. For its part, the Climate Prediction Center now expects a new La Nina to develop, though the full-blown event may not occur until later this fall.
The La Nina footprint never entirely vanished. The Climate Prediction Center said that "atmospheric circulation anomalies still reflect aspects of La Nina” in the July 18 weekly ENSO report... subscribers continue to full report...