[NASA] Tropical Storm Arthur

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3. Tropical Storm Arthur

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Natural color

brightness temperature

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Tropical Storm Arthur’s white storm clouds cover the waters off the U.S. Gulf Coast. Some clouds extend inland over parts of Texas and Louisiana.

NASA Earth Observatory/Michala Garrison

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White and purple areas of cloud off the Gulf Coast indicate the cooler areas of cloud tops associated with Tropical Storm Arthur.

NASA Earth Observatory/Michala Garrison

Natural colorbrightness temperature

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Tropical Storm Arthur’s white storm clouds cover the waters off the U.S. Gulf Coast. Some clouds extend inland over parts of Texas and Louisiana.

NASA Earth Observatory/Michala Garrison

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White and purple areas of cloud off the Gulf Coast indicate the cooler areas of cloud tops associated with Tropical Storm Arthur.

NASA Earth Observatory/Michala Garrison

Natural color

brightness temperature

CurtainToggle2-Up

Image Details

Images from the 

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 (Moderate Resolution Imaging Spectroradiometer) on NASA’s

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satellite show Tropical Storm Arthur on the morning of June 17, 2026. The left image is natural color; the right shows infrared signals known as brightness temperature. NASA Earth Observatory images by Michala Garrison.

Tropical Storm Arthur, the first named storm of the 2026 Atlantic hurricane season, brought high winds and heavy rain to the U.S. Gulf Coast in mid-June.

NASA’s

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satellite captured this natural-color image (left) at 10:30 a.m. Central Time (15:30 Universal Time) on June 17. The second image (right) depicts infrared signals known as brightness temperature, which help distinguish cooler cloud tops (white and purple) from the warmer surface below (yellow and orange). Around the time these images were acquired, the system had just recently been designated a tropical storm, according to the

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(NHC).

Though Arthur stayed below hurricane strength, it still delivered strong winds to parts of the Gulf Coast as it tracked northeast. The storm had maximum sustained winds of 40 miles (65 kilometers) per hour around the time these images were captured. Tropical-storm-force winds extended 175 miles (280 kilometers) from the storm’s center, the

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. Measurements at Galveston, Texas, for instance, showed a gust of 48 miles per hour.

The storm also produced heavy rainfall that the

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could lead to life-threatening flash flooding. Estimates from 

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 (the Integrated Multi-Satellite Retrievals for GPM), a product of the 

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 (Global Precipitation Measurement) mission, showed

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over Gulf waters and extending inland on June 17.

As Arthur weakened and became less organized, it continued to bring abundant moisture to central Gulf Coast states on June 18. The National Weather Service reported rainfall rates of 3 inches (7.6 centimeters) per hour in southeastern Louisiana. Forecasts indicated that storm-total rainfall amounts could exceed 12 inches (30 centimeters) in areas, with some locations seeing totals approaching 20 inches (51 centimeters).

NASA Earth Observatory images by Michala Garrison, using MODIS data from NASA 

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 and 

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. Story by Kathryn Hansen.

Downloads

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June 17, 2026: Natural color

JPEG (2.94 MB)

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June 17, 2026: Brightness temperature

JPEG (2.51 MB)

References & Resources

• National Hurricane Center (2026, June 17)
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  . Accessed June 18, 2026.
• National Public Radio (2026, June 17)
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  . Accessed June 18, 2026.
• National Weather Service, Office of Water Prediction (2026, June 18)
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  . Accessed June 18, 2026.

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