WINDERMERE, Fla. ( Stockpickr) -- Professional traders running mutual funds and hedge funds don't just look at a stock's price moves; they also track big changes in volume activity. Often when above-average volume moves into an equity, it precedes a large spike in volatility.>>5 "Magic Formula" Stocks for 2013 Major moves in volume can signal unusual activity, such as insider buying or selling -- or buying or selling by "superinvestors." Unusual volume can also be a major signal that hedge funds and momentum traders are piling into a stock ahead of a catalyst. These types of traders like to get in well before a large spike, so it's always a smart move to monitor unusual volume. That said, remember to combine trend and price action with unusual volume. Put them all together to help you decipher the next big trend for any stock. >>5 Stocks Warren Buffett Loves With that in mind, let's take a look at several stocks rising on unusual volume today. Western Digital ( WDC) This company is a developer and manufacturer of storage products that enable people to create, manage, experience and preserve digital content. This stock is trading up 8.8% at $36.56 in recent trading. Today's Volume: 6.15 million Average Volume: 3.80 million Volume % Change: 198% Shares of WDC are soaring today after the company declared a quarterly dividend of 25 cents. From a technical perspective, WDC is bouncing hard right off some near-term support at $33.19 and back above its 50-day at $35.79 with heavy upside volume. This move is quickly pushing WDC within range of triggering a near-term breakout trade. That trade will hit once WDC manages to take out some near-term overhead resistance at $37.16 and then once it clears its 200-day at $37.18 with high volume. Traders should now look for long-biased trades in WDC as long as it's trending above its 50-day at $35.79, and then once it sustains a move or close above those breakout levels with volume that hits near or above 3.80 million shares. If that breakout triggers soon, then WDC will set up to re-test or possibly take out its next major overhead resistance levels at $39 to $40.52.