CHRISTIANSTED — Today St. Croix will be partly sunny with a thunderstorm in spots this morning followed by showers in the afternoon and a high of 91, AccuWeather said.
Tonight St. Croix will experience mainly clear conditions and a low of 78, according to AccuWeather.
Outlook on Tropical Weather Conditions at 8 AM 
Tropical Central Atlantic:
A tropical wave moving off the west coast of Africa is currently producing only limited rain activity, the National Weather Service said.
In a few days, environmental conditions are forecast to become favorable for the gradual development of this system, according to the NWS.
A tropical depression could form for the latter stretch of this week as it generally moves west-northwest across the Tropical Central Atlantic, the NWS said.
Probability of training in 48 hours… get down… close to 0 percent.
Formation probability in 7 days… medium… 50 per cent.
Saharan dust will bring hazy skies across the islands today, along with breezy E-SE winds, especially in coastal areas, the National Weather Service said.
“Be sure to secure any loose objects,” the NWS said on Facebook.
HEAT ADVISORY IN EFFECT
10 AM – 5 PM AST
Coastal & Urban Areas of Puerto Rico
A Heat Advisory has been issued today for many parts of Puerto Rico, especially coastal and urban zones. 
Stay safe and take precautions:
Drink plenty of water – even if you’re not thirsty
Avoid strenuous activity during peak heat hours
Rest in the shade or air conditioning
Wear lightweight, light-colored, and loose clothing
Meanwhile, Weather conditions should gradually improve tonight, as the afternoon shower and thunderstorm activity dissipates and Saharan Dust particles depart from our region.
More info: weather.gov/SJU
A Heat Advisory remains in effect for urban and coastal areas of Puerto Rico, with limited heat risk elsewhere, according to the NWS.
Isolated afternoon showers and thunderstorms are possible, with a limited to elevated flood risk over northwestern Puerto Rico, the NWS said.
