The estimated U.S. CDD forecast for week 3-5 ahead remains hot according to ECM while AI models are consistently much cooler. Interestingly, CFS V2 is sharply cooler for week-3 then bounces hotter for week-4/week-5. The primary issue is whether the East U.S. is hot (or not). The East cools off later July but should gradually reheat although not as aggressively as ECM. CFS V2 has the right “trend” and AI models are too cool.

During late June/early July, emergence of a strong positive phase global atmospheric angular momentum (++GLAAM) regime has returned. The new surge of +GLAAM is related to the onset of an El Nino climate. Previously, a pulse of ++GLAAM was observed during late May/early June, elated to a strong Madden Julian oscillation (MJO) episode, and the correlating U.S. temperature anomalies were extremely warm, especially for the Central U.S.