Puerto Rico, US Virgin Islands: High temperatures forecast across the region through at least June 13

High temperatures are forecast to persist across Puerto Rico and the US Virgin Islands through at least June 13. As of June 11, the US National Weather Service (NWS) has issued excessive heat warnings for all coastal areas and areas of lower elevation in Puerto Rico and heat advisories across the US Virgin Islands. Excessive heat watches are in place across the region June 12. Authorities will likely issue new alerts or update/rescind existing advisories as weather conditions change over the coming days.

The high temperatures may result in increased energy and water demand and a heightened risk of heat-related illnesses, such as heat exhaustion and heat stroke. Authorities have advised the public, especially those with chronic diseases, the elderly, and children, to avoid being outdoors during the hottest parts of the day.

The extended period of oppressive heat and dry conditions may produce ideal circumstances for wildfire growth throughout the affected areas. Heatwaves also pose a threat to vulnerable groups - such as the elderly, children, pregnant women, and those with respiratory illnesses - due to the increased possibility of heat stroke or heat exhaustion during prolonged exposure to high temperatures. These health risks could also extend to relatively healthy individuals during significant heatwave events. In addition to significantly impacting athletes and those who work outdoors, high temperatures can cause problems for people using mass transit. The lack of air conditioning and cramped vehicles during rush hour may lead to some passengers being hospitalized for dehydration.

Very high temperatures may warp rail tracks and force passenger and freight trains to operate at reduced speeds. Road surface damage is also possible, and overheated vehicles may worsen traffic problems in urban areas where congestion is already a problem. Commercial trucking disruptions might occur, as very high temperatures put more stress on vehicles, making tire blowouts more common. Major flight disruptions are unlikely at regional airports, but general aviation disruptions are possible, and some airfreight carriers could reduce cargo loads. High temperatures could lead to an increased demand for electricity, which might trigger localized brownouts or blackouts, exacerbating hazardous conditions when air conditioning is no longer possible.