The most predominant group was the utilities, which are all on fire. It didn't matter which one was bought, but Cramer considered the best to be American Electric Power, Consolidated Edison and Dominion.
The second group was the auto repair shops and parts retailers, as they are benefitting from the trend of people holding their cars for longer periods of time. With the average age of a car on the road now up to 12 years, Cramer added that this is why O'Reilly Automotive, Genuine Parts and Autozone have all done so well.
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The third sector screaming to be bought were steel stocks. Ever since the government introduced a stiff tariff on Chinese steel at the beginning of the month, this group has been bullish.
"I think this move, which has allowed the stocks of US Steel and AK Steel to double, has mostly run its course, although the staying power of the speculative steel names is pretty amazing here," Cramer said.
The next group was unexpected for Cramer. The medical device stocks have been on the rise with Stryker, Zimmer Biomet, Bard and Cramer's favorite, Edward Lifesciences, all roaring.
The fifth group blazing a trail was the food sector. Cramer thinks these stocks are benefiting from the dramatic decline in commodity prices as the ingredients, packaging and transportation of goods all require fuel.
He's got his eye on Coca-Cola and PepsiCo, too.
"Here is a cohort that is so ridiculously strong you can assume there has to be both impending consolidation and a spur related to the embrace of natural and organic products," Cramer said.
The last red-hot group Cramer found was related to the home, just not homebuilders. The good news is that he thinks it can still be exploited without too much risk, though the Fed does pose a hazard.
Cramer focused on Home Depot and RPM International. He will also be watching Stanley Black & Decker and Newell-Rubbermaid.
"When you are buying a strong group that is filled with great charts, you are buying stocks with the wind at their backs," Cramer said.
So with a Fed meeting in sight that could cause a sell-off, Cramer recommended for investors to keep these groups in mind — and pounce at a market-wide pullback.