Wind shear eased off the Gulf Coast long enough for Isaias to form in a quiet Atlantic season
Hurricane Isaias killed at least four people after landfall on the U.S. Gulf Coast as a Category 2 storm with 105 mph winds, Scientific American reported. Two meteorologists quoted there say a quiet season narrows where storms can form without softening the one that does.
The Scientist · Science desk
Three figures. Isaias reached Category 3 after an overnight upgrade before landfall. It made landfall on the U.S. Gulf Coast as a Category 2 hurricane. It had been Category 1 before the upgrade.
| Figure | Value | Note | Claim |
|---|---|---|---|
| Rating after overnight upgrade, before landfall | 3 Category | 18 | |
| Rating at landfall | 2 Category | 1 | |
| Rating before the upgrade | 1 Category | 18 |
What happened
- Isaias was the first hurricane of the season and by far the latest first hurricane for an Atlantic season on record.
- It developed after wind shear briefly died down off the Gulf Coast, and extremely warm Atlantic water helped it grow fast.
- The storm was upgraded from Category 1 to Category 3 overnight, before it made landfall.
- Isaias spawned tornadoes, destroyed buildings and downed power lines across the Gulf region.
- Thousands of people were still without power as of Tuesday.
Why it matters
- Who's exposed exposure Remaining Atlantic risk this season concentrates where Isaias already struck: McNoldy expects any further hurricane to land on the Gulf Coast, and the Caribbean's high shear makes storms there unlikely.
- What doesn't add up contradiction The article has Isaias at Category 3 before landfall and Category 2 at landfall, two categories apart, and does not say when it weakened, so 105 mph may not be its peak.
- Who has to decide decision In our view, a low seasonal count is the wrong signal for pausing storm preparation at a Gulf Coast site: the shear that kept the count low still left an opening, and Isaias formed in it.
Wind shear ties the quiet season and the storm together. The El Nino that raised shear over the Atlantic lowered it over the Pacific, where the season has produced historically high numbers of hurricanes over warm water [7]. Brian McNoldy is a hurricane researcher at the University of Miami [16]. He described how little room the Atlantic left: "It found one of the few spots in the Atlantic where a hurricane could have formed; there was a pretty small window of opportunity," he said [8].
So the quiet season cut the number of places a storm could form. The landfall itself looks ordinary. The article calls the destruction typical for a hurricane [15], and McNoldy said the impact was relatively on par with a Category 2 hurricane [14]. He added: "no hurricane is a small ordeal" [11].
Meteorologist Alan Gerard described the National Weather Service's phrase for this situation. Gerard said that when he worked for the National Weather Service, the agency started using a phrase meant to warn people that one storm can do enormous damage even in a hurricane season that is otherwise quiet. He added: "2026 and Isaias is a perfect example of that" [12]. McNoldy made the same point: "No matter what the season is doing, you always have to be paying attention because you don't know when a storm has your name on it" [13].
One storm cannot show whether storms in quiet seasons differ in strength or damage from those in busy ones. The article also does not include a damage estimate. The account rests on a single publication quoting two meteorologists, so the claim it supports is narrow: a low seasonal count did not discount the harm from this landfall.
What to watch
- Whether a second Atlantic hurricane forms this season and whether it lands on the Gulf Coast, as McNoldy expects.
- Whether Atlantic wind shear stays high under the El Niño, which McNoldy says keeps storms out of the Caribbean.
- Updated death and outage figures, since the article's counts are as of Tuesday.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence45
- Adoption
- Not scored
- Hype gap+8
- Incentives
- Not scored
- Confidence50
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
Hurricane Isaias made landfall as a Category 2 hurricane on Saturday with 105 mph winds on the U.S. Gulf Coast.
- [2]
As of Tuesday, the storm had killed at least four people.
- [3]
Thousands of people remained without power as of Tuesday.
- [4]
Isaias spawned tornadoes, destroyed buildings and downed power lines across the Gulf region.
- [5]
Isaias was the first hurricane of an eerily quiet Atlantic season and by far the latest first hurricane for an Atlantic season on record.
- [6]
This year's super El Niño made it difficult for hurricanes to form in the Atlantic because of high wind shear.
- [7]
The Pacific has seen historically high numbers of hurricanes because of low wind shear and warm ocean water, conditions also created by the El Niño.
- [8]
Brian McNoldy said: "It found one of the few spots in the Atlantic where a hurricane could have formed; there was a pretty small window of opportunity."
- [9]
McNoldy said that if another hurricane forms this season, it will likely land somewhere on the Gulf Coast.
- [10]
The Caribbean has especially high wind shear from the El Niño, so storms are not expected there.
- [11]
McNoldy said: "no hurricane is a small ordeal."
- [12]
Alan Gerard said: "When I worked for [the National Weather Service], the agency started using the phrase 'it only takes one' to remind people that even during a quiet hurricane season, a single storm can have tremendous impacts. 2026 and Isaias is a perfect example of that."
- [13]
McNoldy said: "No matter what the season is doing, you always have to be paying attention because you don't know when a storm has your name on it."
- [14]
McNoldy said Isaias' impact is relatively on par with a Category 2 hurricane.
- [15]
The destruction from Isaias is typical for a hurricane.
- [16]
Brian McNoldy is a hurricane researcher at the University of Miami.
- [17]
Isaias developed after wind shear briefly died down off the Gulf Coast, and with the help of extremely warm Atlantic water it grew fast.
- [18]
Isaias was upgraded from Category 1 to Category 3 overnight before it made landfall.
- [19]
Isaias rose two hurricane categories overnight, from Category 1 to Category 3.
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Sources
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Entities
- National Weather ServiceFollow
- University of MiamiFollow
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