Asia Demand Note, Friday 24 July 2026
Generated 21:40 UTC · For JST and AEST market opens
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Central Japan is running a 15-day CDD anomaly of +47.6 against normal while Queensland heating degree-days push +25.9 above seasonal norms, the two bookends of this note, and a reminder that the hemispheres are running their winters and summers simultaneously with notable divergence from expectation.
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Japan
The Pacific High that drives Japan's summer heat load is not uniformly applied across the archipelago this week, and that split is the defining feature of the JP picture. The HEAT_SURGE regime flag has been earned at the national level, the gridded 15-day CDD anomaly sits at +13.0, comfortably clearing the +10.0 threshold, but the spatial texture beneath that headline number is striking. Chubu is the clear epicentre: a CDD of 213.8 against a normal of 166.2 represents an anomaly of +47.6, with the 15-day accumulation running ahead of the prior period's 200.0 as well. The Pacific High's western ridge is pressing warmest air into the interior of Honshu rather than along the coastal plain, and that positioning tends to keep Nagoya and the Tokai corridor in the hottest fetch while marine-influenced sites moderate slightly.
Tokyo presents the inverse story. The capital's CDD at 145.1 sits -10.5 below normal and has stepped back sharply from the prior period's 160.0. That reversal is consistent with a temporary incursion of lower-level moisture and cloud, the kind of suppression that can arrive when the ridge axis is positioned slightly west of the Kanto plain, allowing remnant frontal cloud to linger. Tokyo's aircon load, which is the dominant driver of JEPX Tokyo evening peak sensitivity, will feel that -10.5 anomaly. Kansai at 203.0 is essentially flat versus normal (+29.0 anomaly but just -1.95 off the prior period's 204.95), sitting on the boundary between the two air-mass regimes.
The macro climate state reinforces the HEAT_SURGE read. Nino3.4 at +2.30 is a firm El Niño signal, and the positive AO at +1.23 suggests the polar vortex is well-contained, no cold-surge risk from residual Siberian High pressure reaching southward into Japan in this configuration. The combination argues that the heat in Chubu is not an artefact of a blocking event about to break; it is embedded in a larger-scale pattern with some persistence. The IOD at +0.22 is weakly positive, adding marginal warmth bias at the regional scale. Demand-side, the Chubu anomaly is the zone to watch: at +47.6, industrial and aircon load there is materially elevated, and the region's generation-demand balance will reflect that pressure through the weekend.
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Australia
Australia's NEM is reading a BENIGN regime classification, no tripwire cleared, but benign in classification does not mean uniform. The HDD pattern across the southeast is running above normal in two of the four major zones, and Queensland's anomaly is the sharpest single-zone signal in the entire AU picture.
Queensland at HDD 54.8 versus a normal of 28.9 is a +25.9 anomaly, and the trajectory is accelerating: the prior period sat at 49.2, meaning the heating degree-day accumulation is building, not fading. The mechanism is a cross-Tasman trough that has pushed a cold, dry airmass across the Queensland interior further north than is typical for this point in the austral winter. Queensland heating load in July is structurally a gas-dominated story in the residential and commercial sectors, and an anomaly of this magnitude in a region not normally exposed to sustained cold is worth tracking closely as the 15-day window advances.
New South Wales at +19.7 above normal (HDD 93.4 against a normal of 73.7) confirms the cold airmass extends well down the eastern seaboard. The prior period at 90.85 shows the state is in an accelerating phase here too, with the accumulation adding roughly 2.5 HDD per day beyond what the week before was delivering. Victoria at +7.0 anomaly is a smaller deviation, that state's normal heating base is higher and the incremental cold-surge effect is proportionally smaller, while South Australia at +1.2 is effectively tracking normal.
The large-scale indices shape the interpretation. SAM at +2.79 is strongly positive, which in austral winter tends to tighten the westerly belt around 50–60°S and push frontal systems on a more northerly track before they accelerate east, consistent with Queensland seeing cold air that would typically be moderated by a more zonal circulation. The positive AO at +1.23 and the El Niño background (Nino3.4 +2.30) argue against a rapid breakdown of the pattern, though El Niño's direct influence on Australian winter demand is more through reduced rainfall and clearer skies, both of which can amplify overnight cooling and morning ramp demand in Queensland and NSW.
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What to Watch
The ECMWF 00Z run due early Saturday JST will be the key model update for the Chubu heat event, specifically whether the Pacific High ridge axis holds its westward position or nudges toward the Kanto plain, which would shift the +47.6 anomaly zone eastward and draw Tokyo CDD back toward normal. In Australia, Queensland HDD is the metric on the clock: another day above the current trajectory will push the 15-day anomaly beyond +25.9 and could challenge the BENIGN regime classification depending on where the national gridded threshold sits. Watch whether the cross-Tasman trough shows signs of retreating northeastward in weekend model runs or anchoring further, which would extend the heating load signal into next week.