Tropical Storm Arthur

Earth Observatory 

2 min read

Tropical Storm ArthurImage of the Day for June 19, 2026

The first named storm of the 2026 Atlantic hurricane season brought intense rainfall and the threat of flash flooding to the U.S. Gulf Coast.

NASA Earth Observatory

Jun 19, 2026 Article

View more Images of the Day:Jun 18, 2026Instruments:

• Terra — MODIS

Topics:

• Cyclones

Natural color brightness temperature 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 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 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 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 MODIS (Moderate Resolution Imaging Spectroradiometer) on NASA’s Terra 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 Terra 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 National Hurricane Center (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 NHC reported. Measurements at Galveston, Texas, for instance, showed a gust of 48 miles per hour.

The storm also produced heavy rainfall that the National Weather Service warned could lead to life-threatening flash flooding. Estimates from IMERG (the Integrated Multi-Satellite Retrievals for GPM), a product of the GPM (Global Precipitation Measurement) mission, showed high rainfall rates 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 EOSDIS LANCE and GIBS/Worldview. Story by Kathryn Hansen.

Downloads

June 17, 2026: Natural color

JPEG (2.94 MB)

June 17, 2026: Brightness temperature

JPEG (2.51 MB)

References & Resources

• National Hurricane Center (2026, June 17) Tropical Storm ARTHUR Advisory Archive. Accessed June 18, 2026.
• National Public Radio (2026, June 17) Tropical Storm Arthur is the first named storm of the Atlantic hurricane season. Accessed June 18, 2026.
• National Weather Service, Office of Water Prediction (2026, June 18) Experimental: Tropical Flood Hazard Outlook Product Archive. Accessed June 18, 2026.

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