This is the 'canary in the coal mine' for stocks, market analyst warns

Stocks are taking a breather after a monster rally to begin the second quarter.

Major gains in the first three months of the year also brought indexes back within range of record levels with the Dow Jones Industrial Average less than 800 points from its high.

Gina Sanchez, CEO of Chantico Global, said be wary of the market bounce as there are troubling developments on the horizon.

"We're back to the levels as if the December decline never happened and I think what's interesting is what's pushing that is the Fed has decided to not hike for the rest of 2019 and only once in 2020. Now that is a double-edged sword, that's a canary in the coal mine," Sanchez said Monday on CNBC's "Trading Nation" segment.

After hiking in December, the Federal Reserve turned dovish at its March meeting with members signalling no rate increases this year. While a patient Fed has been taken as a market positive, Sanchez sees its pause as a warning sign of a coming slowdown.

"Look at economic surprises that are deeply negative right now, economists continue to ratchet down their expectations for growth in 2019 and growth in 2020 and we did see the yield curve flashing a negative sign," she said.

While Sanchez does see trouble ahead, she said investors could still squeeze returns out of the market, at least in the near term.

"Earnings are still cycling high because of the tax cut," she said. "That will buoy the market for some time but I think at some point we're going to have to face the fact that we're on the back end of this extension of the markets and we're headed for a downturn at some point, but this rally could continue for a couple of quarters."

The stock market flashed one bullish signal to begin the second quarter: a golden cross, where its 50-day moving average crosses above its 200-day moving average, indicating a change in trend. The last time that happened in mid-2016, the S&P 500 rallied roughly 15 percent in 12 months.

Ari Wald, head of technical analysis at Oppenheimer, sees a far more bullish underlying signal in the market.

"We prefer looking at internal breadth indicators. I think that's where the value add is when talking about technical measures. Looking at the participation of the market, typically rallies with many stocks participating are the rallies that can continue; those with more narrow participations are the ones that are prone to reverse," said Wald during Monday's segment.

"One great tool to look at is the NYSE advance-decline line. It made a new cycle high in February, close to making yet another one. It's something we're going to be watching for. If it does that would indicate to us that the rally is healthy in the S&P 500 and likely to continue," he said.

The S&P 500 is less than 3 percent from its record high set in September. It has bounced 22 percent off its late-December low.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Michael Santoli

Michael Santoli joined CNBC in October 2015 as a Senior Markets Commentator, based at the network's Global Headquarters in Englewood Cliffs, N.J.  Santoli brings his extensive markets expertise to CNBC's Business Day programming, with a regular appearance on CNBC's Closing Bell (M-F, 3PM-5PM ET). In addition, he contributes to CNBC and CNBC PRO, writing regular articles and creating original digital videos.

Previously, Santoli was a Senior Columnist at Yahoo Finance, where he wrote analysis and commentary on the stock market, corporate news and the economy. He also appeared on Yahoo Finance video programs, where he offered insights on the most important business stories of the day, and was a regular contributor to CNBC and other networks.

Follow Michael Santoli on Twitter @michaelsantoli

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