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Typhoon Meranti's path in Asia to signal warm official start to autumn in eastern US

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More warmth is in store for the eastern half of the United States during much of the balance of September, due to the path of Typhoon Meranti in Asia.

"Cool shots, like the one spanning Thursday and Friday in the northeastern U.S. this week, will be brief up until around the end of the month," according to AccuWeather Long-Range Meteorologist Mike Doll.

Cool air will generally be bottled up near and north of the Canada border.

"It will not be until around the last week of September, when a large and long-lasting push of cool air may be felt," Doll said.

As normal temperatures trend downward during the month, actual temperatures will climb to above-average levels during multiple days this weekend and next week in many areas.

The warmth will continue past the first official day of Autumn, which is Thursday, Sept. 22.

High temperatures during multiple days will be in the 80s F in cities such as New York City, Philadelphia, Pittsburgh, Washington, D.C., Atlanta, Nashville, Indianapolis, Cleveland and St. Louis. It is possible some locations in the South, mid-Atlantic and the Midwest flirt with 90 on one or more days. Temperatures can reach 80 or higher in Boston during a few days.

The warm surge during the middle and latter part of next week will be largely fueled by the path of Meranti, which blasted Taiwan on Wednesday and made landfall in China early Thursday, local time.

Meranti is forecast to push well inland and dissipate.

When tropical storms and typhoons fail to re-curve to the east and away from Asia, the corresponding weather pattern across the Pacific and North America favors a buildup of warmth in the eastern part of the U.S. six to 10 days later.

The path of Meranti will correlate to the warmth forecast for the middle and latter part of next week.

Conversely, when tropical storms and typhoons take the curved path and avoid hitting mainland Asia, the weather pattern thousands of miles farther to the east tends to deliver much cooler weather in the eastern U.S. six to 10 days later.

"One such typhoon, Malakas, is projected to curve away from Asia this weekend into early next week, which would set into motion much cooler air in the eastern U.S. just prior to the end of September," Doll said.