Convenience Big Store: Hot Houston weekend has ties to unusual pattern sweeping the U.S.

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This map of the Desert Southwest shows where heat alerts were in effect Thursday. Heat alerts will continue through the end of the week as early season warmth continues.

Photo by: NOAA's National Weather Service / Pivotal Weather

Hot Houston weekend has ties to unusual pattern sweeping the U.S.

Unusual heat is building across Houston this weekend as part of a wider U.S. pattern already bringing record temperatures to California and Arizona.

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