As is usually the case with land-falling tropical systems, isolated tornadoes are possible along the southern Texas coast through Saturday evening.

Hanna will begin to rapidly weaken Saturday tonight and Sunday morning as it moves into northern Mexico. However, it will continue to bring widespread heavy rain and the threat of dangerous flash flooding across the Rio Grande Valley even as the wind speeds go down.

\"PHOTO:
Eric Gay/AP
PHOTO: A man jumps from a wave as Hurricane Hanna begins to make landfall, Saturday, July 25, 2020, in Corpus Christi, Texas.
>

An excessive amount of rain is forecast for extreme southern Texas, south of Corpus Christi, including Port Mansfield, Brownsville and down along parts of the Rio Grande Valley. Rainfall totals of 6 to 12 inches are expected which could produce widespread flash flooding.

Isolated rain totals of over a foot are possible into early Sunday as Hanna begins to moves into northern Mexico.

\"PHOTO:
NASA/Handout/EPA via Shutterstock
PHOTO: A satellite image shows Tropical Storm Hanna as it moves trough the Gulf of Mexico and approaches Texas, July 24, 2020. Tropical Storm Hanna is expected to reach hurricane strength upon making landfall in Texas by nightfall on July 25.
>

Hurricane Douglas approaches Hawaii

Meanwhile near Hawaii, Hurricane Douglas weakened to a Category 1 hurricane with sustained winds down to 90 mph Saturday afternoon local time. It was moving west-northwest at 16 mph and was about 300 miles east of the Big lsland at 4 p.m.

A hurricane warning is in effect for Oahu, including Honolulu. A tropical storm warning is in effect for the Big Island and Maui, while a tropical storm watch is in effect for Kauai.

The weakening trend will continue as it closes in on Hawaii and Douglas will pass near the islands on Sunday. It will likely pass close enough for heavy rain, strong winds and rough surf to impact parts of the state. However, a slight shift in the track could change impacts either way.

\"PHOTO:
ABC News
PHOTO: Hurricane Douglas is expected to bring heavy rain and rough surf to the Hawaiian Islands over the next two days.
>

Douglas will impact the islands as a low-end Category 1 hurricane. While wind and coastal impacts are a concern, very heavy rain will likely be the biggest impact with several inches possible and the potential for flash flooding, landslides and mudslides.

On the current track, the island of Maui and higher elevations have the greatest chance of bearing the worst impact.

On Saturday, President Donald Trump approved Hawaii's emergency declaration request in response to Hurricane Douglas. The request allows Federal Emergency Management Agency to coordinate emergency response efforts.

ABC News' Allison Pecorin contributed to this report.

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