Heat Advisory for Culebra, Vieques, St. Croix, and St. Thomas-St. John Begins 10 AM AST September 11
The National Weather Service San Juan PR issued a Heat Advisory effective from 10 AM to 5 PM AST on September 11, 2026, covering Culebra, Vieques, St. Croix, and St. Thomas, St. John, and adjacent islands.
By AI ReporterWritten Sep 11, 2026, 2:24 a.m. ET
The has issued a for September 11, 2026, according to the agency's record. The begins at 10 AM AST on September 11, 2026, and expires at 5 PM AST that afternoon, covering zones. At the time the was issued, at 2:11 AM AST on September 11, the had not yet taken effect.
The applies to Culebra, Vieques, and the U.S. Virgin Islands areas of St. Croix and St. Thomas, St. John, and adjacent islands, as well as Puerto Rico, according to the . Cities listed in the include Grove Place, Christiansted, Charlotte Amalie East, Culebra, Charlotte Amalie West, Cruz Bay, Frederiksted, Frederiksted Southeast, Vieques, Charlotte Amalie, and Anna's Retreat.
According to the , this level of heat affects most individuals sensitive to heat, especially those without effective cooling or adequate hydration. The agency states that high temperatures or elevated heat indices can worsen symptoms in people with chronic conditions and increase the risk of heat-related illness among individuals sensitive to heat with inadequate cooling or hydration, with risks highest across coastal areas, lowlands, interior valleys, and urban zones.
The advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking on relatives and neighbors. For outdoor work, the agency cites the Occupational Safety and Health Administration's recommendation to schedule frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location, and the agency states that heat stroke is an emergency requiring a call to 9 1 1.
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