A practical map of catalysts that reprice major pairs inside one London–New York overlap — process first, no promised trade.
Start with the calendar, not the chart
Most intraday FX volatility is scheduled: central-bank speakers, CPI and PCE prints, labour reports, and bond auctions. Before you open a platform, list which releases land in your session and which pairs historically whip hardest around them. A blank calendar does not mean a quiet market — equity or oil risk can still spill into currencies without a domestic headline.
Liquidity windows are part of cost
Spreads and slippage often worsen in the Asia open and improve into the London–New York overlap. If your strategy needs tight execution, treat thin hours as a different product. Session quality is part of all-in cost even when the broker’s marketing quote looks unchanged on paper.
Order flow vs. narrative
After a surprise print, the first move is often inventory and stop cascades; the second move is interpretation of the details. Waiting for spreads to normalise is not “missing the trade” — it is refusing to pay a chaos tax. Define in advance whether you trade the spike, the retest, or sit out.
Cross-asset spillovers
USD pairs react to US data, but JPY and CHF can also move with global risk appetite. Watch whether equities, credit, and metals confirm the same story. Conflicting signals usually mean smaller size or no trade.
What this page is not
This is editorial context for how markets behave, not a signal service. Prices can gap, news can leak, and yesterday’s reaction pattern can fail. Size every idea as if a full stop-out is possible.