A bullish engulfing is often a sign of a short term trend reversal. If you see a bullish engulfing with higher than average volume, that gives more confluence to the trend reversal.
These trend reversals sometimes lead to just a day or two of green followed by more downside or can lead to a few weeks of green.
All of these stocks are in steady downtrends which means stay patient on your long entries, but they are ones to watch tomorrow for continued strength.