A worker builds a Ford Expedition SUV as it goes through the assembly line at the Ford Kentucky Truck Plant in Louisville, Kentucky.

A reading of the economy from Morgan Stanley is signaling "June gloom."

Morgan Stanley's Business Conditions Index, which captures turning points in the economy, fell by 32 points in June, to a level of 13 from a level of 45 in May. This drop is the largest one-month decline on record and the lowest level since December 2008 during the financial crisis, according to the firm.

"The decline shows a sharp deterioration in sentiment this month that was broad-based across sectors,' economist Ellen Zentner said in a note to clients. "Fundamental indicators point to a broad softening of activity, but analysts did not widely attribute the weakening to trade policy."

Fears of a possible economic slowdown were raised last week after a much worse than expected jobs report. The economy added just 75,000 jobs in May, according to the Labor Department last Friday. A report Thursday showed a spike in jobless claims last week. Manufacturing activity last month grew at the slowest pace in two years.