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MediumVI Energy Politics & Supply Security7 October 2026, Wednesday

Storm Isaias shuts a quarter of Gulf of Mexico oil output

Tropical Storm Isaias had shut in 25.08% of oil production and 16.37% of gas production in the Gulf of Mexico as of 7 October, according to the US regulator. The Anchorage Daily News puts that at about 511,000 barrels a day.

Location: GULF OF MEXICO

A Reuters report carried by BOE Report said the US Marine Minerals Administration (MMA) reported that 8 of 371 manned platforms (2.16%) had been evacuated as of 7 October. Two of 11 rigs without dynamic positioning (18.8%) were evacuated, and one rig was moved off location as a precaution. Traders Agency said the share shut in on 6 October had been 9.24%, or 185,120 barrels a day, so the figure roughly tripled in a day. Offshore fields in the Gulf of Mexico supply 15% of US crude output and 5% of its natural gas.

Isaias was upgraded to a tropical storm at 04:00 CDT on 7 October. The Anchorage Daily News said it was moving with winds of 50 miles an hour, and a hurricane watch was issued between Bay St. Louis and Indian Pass. Transport Topics reported that the storm is expected to make landfall near Mobile on the morning of 10 October as a Category 2 hurricane with winds of 110 miles an hour. The same report said the National Hurricane Center rated confidence in the track as below average. Traders Agency said six refineries in the storm's path could be affected; Gulf Coast refineries account for about 50% of US refining capacity.

The timing makes the constraint tighter. According to a Reuters report cited by FXStreet, US crude output set a record for a second straight week, while Gulf Coast gasoline stocks fell to their lowest since September 2017. The loss of Hormuz has made the US the supplier of last resort, and Isaias has temporarily knocked out about 511,000 barrels a day of that capacity.

Talay assessment

Bottom line

The roughly 511,000 barrels a day shut in by Isaias hit the very US supply that has been offsetting the loss of Hormuz. Offshore output usually returns within days once a storm passes. The real risk is that six Gulf Coast refineries are affected while product stocks are already at rock bottom. The most likely path is a brief loss of crude followed by a more lasting squeeze in gasoline and diesel.

Likely effects

  • US product pricesNegativeWeeks

    With Gulf Coast gasoline stocks at their lowest since 2017, refinery outages feed quickly into gasoline and diesel prices.

  • Crude supplyNegativeWeeks

    A 25% output loss curbs US export capacity while the storm lasts and pushes Atlantic Basin buyers to seek alternative supply.

  • Türkiye's diesel importsNegativeWeeks

    If diesel flows from US Gulf refineries to Europe are disrupted, the Mediterranean diesel market on which Türkiye also depends will tighten.

Possibilities, ranked

  1. 1
    Brief outage, quick return55%

    Isaias makes landfall on 10 October, offshore output largely returns within a week and refineries suffer light damage.

    Watch: The MMA's daily shut-in share falling below 5%

  2. 2
    Refinery damage drags on30%

    Refineries and ports along the Mobile–Pensacola stretch are disrupted for weeks and US product stocks hit new lows.

    Watch: Gulf Coast refinery utilisation and gasoline stocks in the EIA weekly report

  3. 3
    Storm weakens15%

    Isaias comes ashore weaker than expected and shut-in output returns within two to three days.

    Watch: A category downgrade in the National Hurricane Center's 9 October forecasts

Probabilities are calibrated judgement based on the sources, not measurement, and are revised as new information arrives. Not investment advice.

Market reaction

Indicators affected

  • Oil output shut in▼ 25.08%
  • Daily loss (ADN)▼ ~511,000 barrels
  • Gas output shut in▼ 16.37%

Sources

  1. BOE Report (Reuters) — About 25% of Gulf of Mexico oil output shut in due to Isaias
  2. Anchorage Daily News — Tropical Storm Isaias is forecast to become a hurricane and hit the Gulf Coast
  3. Traders Agency — NHC upgrades Gulf system to Tropical Storm Isaias
  4. Transport Topics — Isaias to menace U.S. oil assets as Category 2 hurricane
  5. FXStreet — IEA pushes to accelerate release of 100 million barrels of oil stocks