US Morning Demand Note, Monday, July 06, 2026
A sustained continental heat pattern has pushed the national 15-day gas-weighted cooling degree day load to 223, or 99 CDD above the seasonal norm, with model runs holding flat from the prior cycle across all four demand zones.
The synoptic setup points to a high-amplitude ridge dominating the mid-level flow across the continental interior, suppressing frontal activity and maintaining elevated temperatures through the 15-day forecast window. Run-to-run stability, zero delta across the national aggregate and each zone individually, indicates the pattern is not in an active revision phase; models are converging on a persistent heat regime rather than debating the timing of a break. The main forward risk is not a directional flip but whether downstream troughs can erode the ridge periphery, and nothing in the current runs suggests that is resolving within the window.
The heat footprint is broadest and most extreme across ERCOT and the South/West region. ERCOT, HSC, and Waha are running 445 CDD against a 15-day normal of 167, an anomaly of 278 CDD consistent with a deep-summer heat dome entrenched over Texas and the southern plains. The South/West catchment, Transco Zone 4 and SoCal, shows 378 CDD against a normal of 161, a 217 CDD departure consistent with ridging extending from the Basin and Range into the Gulf Coast corridor and compressing overnight recovery at both the California and Southeast ends of the zone.
The northern tier is running above seasonal norms but with smaller absolute departures. The Midwest, covering Chicago Citygate and MISO, shows 165 CDD against a 79 CDD baseline, a gap of 86 that places the ridge axis over the southern and central plains, delivering above-normal but not extreme conditions to the Chicago catchment. The Northeast, covering Algonquin and TETCO M3, is at 154 CDD versus a 106 norm, an anomaly of 48 consistent with the zone sitting on the cooler edge of the heat pattern where coastal influence and frontal proximity limit the upside.
The setup now turns on whether the ridge axis begins to retrograde or amplifies further, particularly over the southern tier where ERCOT and Waha are already carrying anomalies far outside the historical distribution. Any run-to-run shift toward the ridge shedding eastward would begin to erode the ERCOT and South/West departures first. Until that resolves, the national and zone-level CDD signals remain supportive for Henry Hub front-month gas and regional power demand, with the heavier weight on the southern hubs where the pattern concentration is greatest.