It’s peak hurricane season, as Hurricane Dorian has been reminding us.
But Dorian isn’t the only strong storm swirling: Four cyclones churned over the oceans this week. On Sep. 4, 2019, they lined up for a satellite camera.
The GOES 16 satellite, operated by that National Oceanic and Atmospheric Administration (NOAA) with help from NASA, captured the above image of the Western Hemisphere on Sep. 4, 2019. It shows Hurricane Juliette, Tropical Storm Fernand, Hurricane Dorian, and Tropical Storm Gabrielle lined up across the globe.
At the time the photo was taken, Juliette in the East Pacific and Dorian in the Atlantic were Category 2 hurricanes. Fernand and Gabrielle were tropical storms with sustained wind speeds 45 mph and 50 mph, respectively.
Labeled image of the chain of tropical cyclones lined up across the Western Hemisphere on Sep. 4, 2019.
The image shows 2 hurricanes and 2 tropical storms
Dorian made a record-tying landfall in the northwestern Bahamas on Sep.1, 2019, as a Category 5 hurricane with 185-mph sustained winds. It ground to a halt on Sep. 2, 2019, flooding islands with a wall of water up to 23 feet high, ripping buildings apart with wind gusts as strong as 220 mph, and killing at least 23 people.
In the NOAA image, Dorian can be seen traveling north along Florida’s east coast, towards Georgia and the Carolinas. Since then, it has brought heavy rains and flash floods, lashed the southeastern US coast with powerful winds, caused tornadoes, and even caused bricks of cocaine to wash up on a beach. One man was reported dead in North Carolina after falling off a ladder while preparing for the storm.
Tropical Storm Fernand, meanwhile had just made landfall over northeastern Mexico at the time of this satellite image. The storm caused heavy rainfall, with a threat of flash flooding and mudslides, but it has since dissipated.
Hurricane Juliette has stuck to the open ocean in the East Pacific, and is expected to weaken over the next few days.
Tropical Storm Gabrielle has wandered harmlessly through the open Atlantic, and on Sep. 5, 2019, was “struggling to maintain thunderstorms near its center,” the National Hurricane Center (NHC) reported.
Hurricane Dorian moves slowly past Grand Bahama Island on Sep. 2, 2019.
An above-average hurricane season in the Atlantic
NOAA recently revised its forecast for this year’s Atlantic hurricane season — it now projects a 45% chance that this year will see above-average activity. That could mean five to nine hurricanes in the Atlantic, with two to four of those expected storms becoming major hurricanes (defined as Category 3 or above, with winds greater than 110 miles per hour).
On average, the Atlantic sees six hurricanes in a season, with three developing into major hurricanes (defined as Category 3 or above). Hurricane season peaks in August through October, with especially high activity around September 10. The season ends November 30.
Hurricane category numbers don’t necessarily indicate the full destructive power of a storm, however, as they’re based solely on wind speeds. In Hurricane Dorian’s case, the storm has traveled slowly, so its effects have been prolonged.
Slower, wetter storms like this are becoming more common as the planet warms. Over the past 70 years or so, the speed of hurricanes and tropical storms has slowed about 10% on average, a 2018 study found.
Dorian is now the fifth hurricane to reach Category 5 over the past four hurricane seasons in the North Atlantic. In the last 95 years, there have been only 35 Category 5 hurricanes in the North Atlantic, so this frequency of strong storms is far above average.
This article originally appeared on Insider. Follow @thisisinsider on Twitter.