News Release

NASA gives eastern Pacific Ocean's Hurricane Eugene 'eye exam'

Peer-Reviewed Publication

NASA/Goddard Space Flight Center

Satellite image of Eugene

image: NASA-NOAA's Suomi NPP satellite captured this visible light image of Tropical Storm Eugene off the western coast of Mexico on July 9, 2017, at 4:30 p.m. EDT (2030 UTC). The image showed that the eye had become cloud-filled. view more 

Credit: NOAA/NASA Goddard Rapid Response

NASA satellites gave the Eastern Pacific Ocean's Hurricane Eugene an "eye exam" as it studied the storm in infrared and visible light. NASA satellite imagery taken at different times showed Eugene's eye open and closed.

Despite its distance from land, Eugene was causing dangerous ocean swells along the western coast of Baja California on July 10.

Hurricane Eugene formed from a low pressure area that rapidly developed into a tropical storm on Friday, July 7, around 5 p.m. EDT (2100 UTC).

On Sunday, July 9, at 8 a.m. EDT (1200 UTC) NOAA's GOES-West infrared satellite imagery revealed an eye as the storm reached Category 2 status on the Saffir-Simpson Hurricane Wind Scale. Eugene as located about 565 miles (185 km) southwest of the southern tip of Baja California, Mexico, at the time.

It was another eye-opening experience at 2:15 p.m. EDT (1815 UTC) when the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Terra satellite captured visible-light image of a clear-eyed Hurricane Eugene. The image showed powerful, high thunderstorms surrounding an eye and cloud tops colder than minus 94 degrees Fahrenheit (minus 70 degrees Celsius) had at times completely encircled the eye. When Terra passed overhead Eugene had already intensified further into a Category 3 hurricane on the Saffir-Simpson Hurricane Wind Scale, packing maximum sustained winds near 115 mph (185 kph).

The Visible Infrared Imaging Radiometer Suite (VIIRS) instrument aboard NASA-NOAA's Suomi NPP satellite captured a visible light image of Tropical Storm Eugene off the western coast of Mexico on July 9 at 4:30 p.m. EDT (20:30 UTC). The image showed that the eye was becoming cloud-filled. Six and a half hours later at 11 p.m. EDT the National Hurricane Center noted that the strengthening trend of Eugene appeared to have ended. The eye of the hurricane had become cloud-filled and ragged, and the convection in the eyewall is not quite as symmetric as it was earlier on July 9.

On Monday, July 10, at 11 a.m. EDT (1500 UTC), NOAA's National Hurricane Center (NHC) noted that Eugene continued weakening as it was moving parallel to the west coast of Baja California. However, NHC cautioned that "high surf and rip currents are likely along the west coast of the Baja California peninsula and southern California."

NHC forecaster Chris Landsea noted in the 11 a.m. EDT discussion that swells generated by Eugene are affecting portions of the west coast of the Baja California peninsula and will spread northward to portions of southern California by tonight and Tuesday (July 11). These swells are likely to cause life-threatening surf and rip current conditions.

The center of Hurricane Eugene was located near 18.7 degrees north latitude 18.7 and 117.2 degrees west longitude. That's about 555 miles (890 km) west-southwest of the southern tip of Baja California. Eugene was moving toward the northwest near 10 mph (17 kph) and this motion is expected to continue during the next couple of days.

Maximum sustained winds have dropped to near 85 mph (140 kph) with higher gusts. Continued weakening is forecast during the next 48 hours. Eugene is expected to become a tropical storm by Tuesday and a remnant low by Wednesday, July 12.


For updated forecasts on Eugene, visit:

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.