Crude oil futures exploded higher Monday, with WTI jumping 9.2% to $77.99 and Brent surging 9.59% to $83.30, after President Trump announced a full naval blockade of Iran — an escalation that puts roughly 20% of the world's daily oil supply at direct risk of disruption through the Strait of Hormuz. Iran Blockade Returns and Oil Jumps 9% — But Can Crude Stay Above $80 or Will Oversupply Cap the Rally?
Crude oil futures posted their biggest single-day gain since May 2020 after President Trump announced the reinstatement of a naval blockade on Iran, sending WTI to $78.14 (+9.4%) and Brent to $83.30 (+9.6%). The blockade begins at 4 p.m. ET Tuesday, July 14, and covers all vessels transiting to or from Iranian ports.
Even before Monday's announcement, Strait of Hormuz traffic had already plunged 52% week-over-week. For anyone who drives a car, heats a home, or owns equities, this matters immediately.
A Collapsed Ceasefire Puts One-Fifth of Global Oil Back at Risk. Over the weekend, the U.S. struck roughly 140 targets inside Iran; Tehran retaliated by firing on U.S. bases and infrastructure inside neighboring Gulf nations.
On Sunday, only 14 ships crossed Hormuz — down from more than 100 daily before the war — with just four carrying crude.
The strait normally handles about 20 million barrels per day, roughly 20% of global seaborne oil trade. Any sustained disruption here hits global supply in a way no pipeline can replace.
Gasoline Prices Are About to Follow — and the Fed Is Watching. GasBuddy analyst Patrick De Haan expects "the national average price of gasoline to reach $4 per gallon in the next 7-10 days, if not sooner." Higher fuel costs feed directly into inflation. Money markets are already pricing in roughly 50% odds of a Federal Reserve rate hike in July — a prospect that dragged equities lower, with the S&P 500 losing 0.79% and the Nasdaq dropping 1.55%.
The Ceiling on This Rally May Already Be in Sight. Prices remain well below their March wartime highs above $100, and futures markets still expect Brent near $80 in December. Why? The global economy entered this conflict oversupplied with oil, and China — the world's largest crude importer — has sharply slowed purchases.
After five months of conflict, however, government and private oil inventories have been largely drawn down , meaning any further supply shock hits a thinner cushion than before.
The Bottom Line for Investors. One analyst noted that oil's slide back to pre-war levels in June "reflected markets pricing in a best-case outcome" for the U.S.-Iran truce — and last week's re-escalation "exposes how fragile that assumption was." Energy stocks rallied Monday, but the broader market paid the price. Until Hormuz traffic normalizes, expect elevated volatility, higher pump prices, and a Fed increasingly boxed in between fighting inflation and protecting growth.