US Morning Demand Note, Friday, July 31, 2026
The signal that matters heading into the weekend: the national 15-day gas-weighted CDD print has shed 28 units run-over-run, a meaningful trim, but at 195 against a normal of 116, the anomaly remains deeply positive at +79. The curve is backing off a peak, not breaking down.
The synoptic read is one of a high-amplitude summer ridge under pressure at the margins. The core heat mass remains anchored, ERCOT's 15-day CDD held virtually unchanged at 413 against a normal of 175, an anomaly of 238 standard-deviation units above climatology, but the flanks are adjusting. The widest single-day run-to-run shift lands on August 12 at -8 CDDs, pointing to a trough intrusion or ridge retrogression in the Day 10-15 window rather than an immediate breakdown. That's the hinge: if the ridge axis holds its current longitude through the medium range, the August 12 gap stays isolated and the pattern recovers; if the ridge sheds eastward, or the downstream trough digs more aggressively, that date becomes the leading edge of a broader correction. Runs are not yet converging on one scenario for that window, which argues for keeping the medium-range signal conditional rather than directional.
The zone picture makes clear where this pattern is actually being priced. ERCOT is the structural anchor: an anomaly of +238 CDDs against a sigma of 25 is not a short-term aberration, it is a persistent regime signal, and the flat run-to-run delta confirms the core Texas heat load is not moving. The South/West zone, Transco Z4 and SoCal, carries a +153 CDD anomaly with a -17 delta, a modest trim that still leaves the region running more than 150 units above normal; the desert Southwest ridge contribution is intact. The Northeast is the most stable relative to last run, shedding only 7 CDDs while sitting +78 above normal on Algonquin and TETCO M3, that stickiness reflects a coastal ridge influence that has been slow to respond to upstream adjustments. The Midwest is the zone to watch: a -72 CDD revision is the largest absolute swing across the complex, pulling Chicago Citygate and MISO from 171 to 98. That revision still carries a +29 anomaly versus a sigma of only 16, so the zone remains demand-supportive, but the run-to-run move signals that the northern tier is most exposed to the August 12 trough threat.
Market read is supportive across Henry Hub and regional power, the cooling burn anomaly is too wide and too broad-based to read otherwise at this window. All four demand-supportive regions have instrument chips lit.
What changes the picture: a second consecutive southward revision in the Midwest, particularly if the August 12 gap deepens and spreads into the Day 8-10 range, would signal the trough is arriving earlier and the northern flank heat is not recovering. Conversely, any run that firms the Northeast above its current +78 anomaly while ERCOT holds would reinforce the multi-regional support structure into August. The regime call is suspended this run; resolution of that model uncertainty is itself a market catalyst.