By Wallace Witkowski, MarketWatch

SAN FRANCISCO (MarketWatch) -- February job numbers and continued fallout from harsh winter weather over much of the country will have a big hand in deciding whether the recent recovery in stocks has legs to run further.

The S&P 500 Index (SPX) finished the month up 4.3% to close at a record high of 1,859.53. The index is up 0.6% gain on the year. The Dow Jones Industrial Average (DJI) finished February 4% higher, paring its loss on the year to 1.5%. The Nasdaq Composite Index (RIXF) finished up 5% for the month and is currently up 3.2% for the year.

Thursday will also mark the fifth anniversary of the current bull market. Back on March 6, 2009, the S&P 500 closed at of 683.38, its lowest level since the financial crisis began. With stocks poised to continue gains realized in 2013 following a setback early in 2014 from an emerging market scare, many strategists are not expecting a bullish break out but more reserved gains with higher volatility.

"There seems to be a consistent trend of investor complacency," said Belski. "We have to be careful after the market has gone up so much. The market desperately needs a rest and a reset."

A jump in short positions over the past two weeks as stocks have rallied suggests that some investors are concerned the bull market is looking long in the tooth as it approaches its fifth birthday with so-called momentum stocks figuring prominently.

Even large-cap stocks are not immune. While the percent of short-interest positions in large caps tends to be in the low single-digit-range of outstanding shares, several companies saw jumps of 20% or more in the number of shares shorted over the past two weeks.

Heavyweights in the S&P 500 such as Apple Inc. (AAPL), Microsoft Corp. (MSFT) , Comcast Corp. (CMCSA), Cisco Systems Inc. (CSCO), AbbVie Inc.(ABBV), Honeywell Corp. (HON), Priceline.com Inc. (PCLN), DuPont (DD), Dow Chemical Co. (DOW), Monsanto Co. (MON), and Starbucks Corp. (SBUX) all saw a 20% or more jump in the number of short-interest positions in the past two weeks alone, according to FactSet data.

Exchange-traded funds following the S&P 500 and the Dow also saw a big jump with the number of shorts in the SPDR S&P 500 ETF (SPY) and the SPDR Dow Jones Industrial Average ETF (DIA) both growing more than 8% over the past two weeks to 29% and 19% of outstanding shares, respectively.

An exercise in caution, as the market recovers from its pullback, is one big reason BMO's Belski is holding onto his S&P 500 target for 2014 of 1,900, just 2.2% shy of Friday's close.

It all comes down to jobs and the weather

Markets finished higher Friday after fourth-quarter GDP growth was scaled back as expected to 2.4% from its initial reading of 3.2%, with gains in the Chicago PMI, consumer sentiment, and pending home sales offsetting tensions in Ukraine.

Ruling out a situation that spirals out of control in Ukraine, the jobs number on Friday will be the biggest driver of where the market heads, along with how adverse winter weather is disrupting businesses and hiring.

"There's the expectation that jobs are going to get dinged by the weather," said Dan Greenhaus, chief global strategist at BTIG.

Economists surveyed by MarketWatch expect a slight rise in added jobs to 140,000, with national unemployment rate unchanged at 6.6%.

Harsh winter weather and how it affect the first quarter is likely going to remain with us for several more weeks, and might add a level of volatility to markets, Greenhaus said. By volatility, Greenhaus means where the CBOE Volatility Index (VIX) is in the range of 15. In other words, where the VIX has averaged over the past three years, excluding the big surges from 2010 and 2011.

"Jobs are key to the entire thing, a strong number would diffuse the cold weather thing," Belski said.

Markets are already "priced to perfection" on the current rate of Federal Reserve tapering. That should hold barring a misstep in wording out of the Fed that could trigger a sell off, Belski said. Investors, however, have also become a little more comfortable with buying on the dips given that mini corrections are a part of most bull markets, he added.

"It's pretty clear that investors are comfortable with the notion of tapering but not with the longer-term vision of [Federal Reserve Chairwoman Janet] Yellen," Belski said. "What if something changes? What then? Everyone is giving them so much credit that they can only misstep from here."

Other than that, the situation in the Ukraine could boil over, introducing volatility. After the market close on Friday, President Barack Obama warned Russia that any troop intervention in Ukraine would have a destabilizing effect. "It's never good when you have Russia flexing its muscles," Belski said.

Other data this week includes ISM manufacturing data on Monday, ISM service and ADP unemployment on Wednesday, and factory orders on Thursday.

Any one of those one-day data points has the potential to give markets a boost, Greenhaus said., but for the most part, stock levels are going to remain dictated by earnings, and how companies maneuver the first quarter leading up to the next earnings season.

With 97% of companies in the S&P 500 having reported this season, fourth-quarter earnings growth stands at 8.5% with revenue up 0.7%, according to John Butters, senior earnings analyst for FactSet. Negative outlook for the first quarter is still running high with 83% of companies providing an earnings forecast below the Wall Street consensus, but that less than the 88% from this time in the previous quarter.

Companies reporting quarterly earnings this week include AutoZone Inc. (AZO), Costco Wholesale Corp. (COST), Kroeger Co. (KR) , and Staples Inc. (SPLS)

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