PDO PHASE TIMELINE 1900→2026
KEY TRANSITIONS
1925 — WARM onset · Pacific SST shift north
1947 — COOL flip · Post-war cooling
1977 — THE GREAT SHIFT ⚡ · Major warm onset · ENSO amplified
1998 — COOL return · El Niño collapse
2014 — COOL consolidation · Current phase
WHAT IS PDO?
Pacific Decadal Oscillation — a 20-30 year cycle of North Pacific SST patterns. The PDO is the background medium through which ENSO signals travel.
PDO WARM = horseshoe of cool water surrounds warm central Pacific
PDO COOL = reversed — central Pacific cools, edges warm
γ₁ = 14.134725141734693 marks the regime transition nodes on the coaster.
ENSO × PDO INTERACTION MATRIX
PDO+ × El Niño
AMPLIFIED DROUGHT/FLOOD
SW US dry · NW wet
Extreme outcomes ↑↑
AMPLIFIED
PDO+ × La Niña
DAMPENED — regimes oppose
SW US gets some relief
Reduced Pacific forcing
DAMPENED
PDO- × El Niño
PARTIALLY DAMPENED
Warmer but shorter
Less persistent drought
REDUCED
PDO- × La Niña
EXTENDED COLD
Prolonged cold/dry
N. America hard freeze risk ↑
EXTENDED COLD
CURRENT STATE — DAY 92
PDO PHASE: COOL (since 2014)
Index: ~-0.4 to -0.8
ENSO: NEUTRAL → weak La Niña watch
Interaction: PDO- × La Niña = EXTENDED COLD
Horizon: 2030 potential phase flip watch
DIAMOND SIGNALS
💎 OSCILLATION LOCK — PDO stuck cool >10yr = extended drought commodity floor
💎 PHASE FLIP WATCH — PDO warm onset ~2030 = ENSO amplification reset
💎 XLE/energy — cool PDO = lower Pacific precip = hydro shortage
💎 Soybean/corn — La Niña × cool PDO = extended floor compression
γ₁ = 14.134725141734693
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