3:00 p.m. EDT Tuesday:
According to Bloomsberg, Isaac has now shut down 93 percent of oil output and 67 percent of natural gas output in the Gulf of Mexico.
As Isaac impacts the Gulf of Mexico, oil and gas companies have evacuated workers and shut down production.
Isaac's disruption of oil production makes oil and gas prices uncertain. One factor that could make the prices rise is the limited supply with Gulf oil production shutting down. The price of oil could drop, however, if the United States government releases oil from the Strategic Petroleum Reserve.
Based on Bureau of Safety and Environment Enforcement (BSEE) data from offshore operator reports submitted Sunday morning, one in 10 oils rigs and around one in 20 manned oil platforms evacuated workers.
Estimates from the BSEE Sunday had around a quarter of oil production closed in the Gulf of Mexico. Isaac halted less than 10 percent of natural gas production so far.
Map of oil rigs and platforms in the Gulf of Mexico in 2008 from GeoCommons.com. The map was produced and published by William Benjamin.
Conditions will deteriorate across Hawaii this weekend as Darby delivers locally heavy rain and rough surf. But the tropical storm will provide long-term benefits.
The midwestern United States will be in the crosshairs of potent thunderstorms into Saturday night.
Much of the eastern United States will continue to swelter with above-average temperatures into the end of the month.
Stifling heat has been baking the central United States but will finally ease across northern areas this weekend.
Lightning killed a teenager on Friday, the second teen lightning death in three days. With thunderstorms continuing to rattle several parts of the nation, more lives will be at risk.
The more than 100,000 people expected to attend the annual Glorious Goodwood festival next week will want to keep a brolly handy.
Seattle, WA (1991)
99 degrees, all-time record high for July.
Heat Wave: Location New Record(F): Old Record(F)/Year: Washington, D.C. 101 100/1987 Philadelphia, PA 99T 99/1978 Atlantic City, NJ 100 96/1987 Harrisburg, PA 103 98/1987 Baltimore, MD 103 98/1987 (Custom House)
New Zealand (1995)
Extreme cold - a bay in Littleton Harbor froze for the first time in "living memory".