Hurricane Rosa will cause heavy rains in the southwestern United States after landfall in Mexico

Hurricane Rosa will not be a hurricane until it reaches the southwest, but the storm will bring heavy rains to Arizona, Southern California and Nevada earlier this week next.

Rosa weakens Saturday morning with sustained maximum winds of 100 mph. An additional weakening is expected for the weekend and Rosa will likely become a tropical storm on Sunday or Monday. The storm was located 625 miles south-southwest of Punta Eugenia, Mexico, and was moving north at 9 mph from 5 am.

The storm will continue in this direction on Saturday before heading northeast on Monday. Rosa is expected to land in Baja California on Monday.

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After touching down, Rosa will continue to weaken as a true tropical cyclone. However, Rosa or her remains will enter the southwestern United States late Monday and Tuesday.

The main threat of Rosa in the United States will be very heavy rainfall. In the southwestern United States, abundant tropical moisture from Rosa will cause very heavy rains, possibly with total rainfall of 1 to 6 inches, locally. This rain could cause flash floods and dangerous debris flows. Landslides in mountainous terrain are also possible.

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A new flash flood watch has been posted for parts of Arizona, Nevada and California starting Monday.

Large waves are possible off the south coast of California until Monday, with waves reaching 10 feet on the south-facing beaches. Surf notices have been issued for parts of Southern California.

A trough heading towards California will help pull what remains of Rosa to the north, where it will interact with tropical moisture to bring a large area of ​​heavy rains to parts of the southwest during the early days of next week.

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Heavy rain showers with isolated thunderstorms will develop in parts of the southwest on Monday and Tuesday, particularly in Arizona and southern Nevada.

Precipitation rates of 1 to 3 inches per hour are likely, which could lead to a possible "flash flood," according to the National Weather Service. Local rainfall of 2 to 4 inches is possible early next week, especially in parts of Arizona and southern Nevada, including Phoenix, Flagstaff and parts of the Las Metropolitan area. Vegas. For this region of the country, it would be an important rainy event.

Los Angeles and San Diego could see some of the first rains of the season, with half an inch of rain possible locally.

Future temperature change for the east and central United States

A rapid fall snowfall accumulated more than 6 inches in parts of eastern Wyoming and western South Dakota on Friday. A new disruption will move to parts of the Midwest late Saturday and Sunday and bring a new rain shower to parts of the area, particularly in Iowa and northern Illinois. The rain could become locally heavy Monday with possible rainfall greater than 1 inch.

A dry weekend is coming to the northeast.

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Another series of cool fall temperatures moved to parts of the northern plains on Saturday morning, with temperatures in the 1930s in many places in the Dakotas, Minnesota and Wisconsin. Some of the first frosts of the season occur in parts of the Upper Midwest, particularly in the suburbs of Des Moines, in Iowa; Chicago; and Milwaukee, Wisconsin.

However, it seems that another dramatic rise in temperatures is likely in most of the country over the coming week. When a trough interacts with the remnants of Rosa in the southwestern United States, the strong pressures will dissipate to the east and result in significant warming of the central and eastern states. -United.

Temperatures could be in the upper 80s across the central plains for some parts of the week. In parts of the Midwest, there could be a temperature rise of nearly 20 degrees by Wednesday. Part of this hot air is in the northeast with temperatures around 80 degrees before the first days of October.

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