The momentum stocks TheStreet's founder Jim Cramer has christened "FAAA" --Facebook (FB) - Get Report , Alibaba (BABA) - Get Report , Amazon.com (AMZN) - Get Report and Alphabet (GOOGL) - Get Report  -- have two things in common from a technical standpoint: They are trading above "golden cross" formations on their daily charts and each has positive but overbought weekly charts, the true definition of strong momentum.

A "golden cross" occurs when a stock's 50-day simple moving average rises above its 200-day simple moving average and indicates that higher prices lie ahead.

Facebook has been above its "golden cross" since Aug. 8, 2013 when the stock was closed at $38.54. The company reports earnings after the closing bell on Nov. 2 and analysts expect Facebook to earn 76 cents a share. Cramer, whose Action Alerts PLUS portfolio holds Facebook, recently wrote, "We continue to appreciate the management team's drive for innovation as they are never comfortable with their current position -- this should help the company remain a leader in the tech space for years to come.

Alibaba has been above its "golden cross" since April 25 when the stock closed at $78.84. Alibaba reports earnings before the opening bell on Nov. 2 and analysts expect the company to earn 47 cents a share.

Amazon.com has been above its "golden cross" since April 22 when the stock closed at $620.50. Amazon reports earnings after the closing bell on Thursday and analysts expect the company to earn 86 cents a share.

Alphabet has been above its "golden cross" since August 16 when the stock closed at $801.19. Alphabet reports earnings after the closing bell on Thursday and analysts expect the company to earn $6.64 a share. Cramer and co-portfolio manager Jack Mohr said of this AAP holding, "We understand there can be some bumps along the road as tough comps remain a lingering concern, but we are confident in the growth prospects of the company over the long term."

Facebook and Alphabet set new all-time intraday highs of $133.50 and $838.50, respectively, on Tuesday with Alphabet ending the day with a "key reversal" where the stock's close was below Monday's low. This is the first warning for these mojo names.

The weekly charts shown below show a red line through the price bars, which is the key weekly moving average (a five-week modified moving average). The green line is the 200-week simple moving average, which is considered the "reversion to the mean." The study in red along the bottom of the chart is weekly momentum (a 12x3x3 weekly slow stochastic), which scales between 00.00 and 100.00, where readings above 80.00 indicates overbought and readings below 20.00 indicates oversold.

The charts below are positive but overbought with each stock above its key weekly moving average with weekly momentum above the overbought threshold of 80.00.

By observing stochastic readings momentum investors can judge when to reduce long positions. The 12x3x3 weekly slow stochastic is based upon the last 12 weeks of data -- each week's high, low and last prices. This measure of momentum rises as new weekly highs occur when the last prices closer to the highs. When this pattern changes and weekly last prices are closer to the lows, the stochastic reading will begin to decline providing an early warning to reduce holdings.

Here's the FAAA scorecard.

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Here's the weekly chart for Facebook.

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Courtesy of MetaStock Xenith

Facebook stock trades around $132, up 26.4% year to date and in bull market territory 48% above its Jan. 20 low of $89.37. The stock set an all-time intraday high of $133.50 on Tuesday, Oct. 25.

The weekly chart for Facebook is positive but overbought with the stock above its key weekly moving average of $128.77 and well above the 200-week simple moving average of $75.69. The weekly momentum reading is projected to rise to 82.58 this week up from 80.66 on Oct. 21, moving further above the overbought threshold of 80.00.

Investors looking to buy Facebook should consider buying weakness to $127.41 and $126.62, which are key levels on technical charts until the end of October and to the end of 2016, respectively. Investors looking to reduce holdings should consider selling strength to $146.75, which are key levels on technical charts until the end of 2016.

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Here's the weekly chart for Alibaba.

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Courtesy of MetaStock Xenith

Alibaba trades at $104, up 28.2% year to date and in bull market territory 75.9% above its Feb. 9 low of $59.25. The stock set an all-time intraday high of $109.87 on Sept. 28.

The weekly chart for Alibaba is positive but overbought with the stock above its key weekly moving average of $101.98. The stock has not been publicly-traded long enough to have a 200-week simple moving average. The weekly momentum reading is projected to end the week at 81.75 down from 84.72, becoming less overbought versus the threshold of 80.00.

Investors looking to buy Alibaba should consider doing so on weakness to $84.45, which is a key level on technical charts until the end of 2016. The $105.76 level should be a magnet until the end of the month. Investors looking to reduce holdings should sell strength to $115.93, which is a key level on technical charts until the end of 2016.

Here's the weekly chart for Amazon.com.

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Courtesy of MetaStock Xenith

Amazon trades around $835, up 23.6% year to date and in bull market territory 76.2% above its Feb. 9 low of $474. The stock set an all-time intraday high of $847.21 on Oct. 6.

The weekly chart for Amazon is positive but overbought with the stock above its key weekly moving average of $810.07 and well above the 200-week simple moving average of $439.16. The last time that Amazon was trading around its 200-week SMA was during the week of Feb. 6, 2009, when the average was $54.44. The weekly momentum reading is projected to slip to 84.98 this week down from 87.97 on Oct. 21, becoming less overbought versus the 80.00 threshold. Momentum has been above 80.00 since the week of May 6.

Investors looking to buy Amazon should consider doing so on weakness to $721.28, which is a key level on technical charts until the end of 2016. Investors looking to reduce holdings should sell strength to $845.61 and $852.72, which are key levels on technical charts until the end of October, and until the end of 2016, respectively. The all-time intraday high of $847.21 on Oct. 6 was an opportunity to reduce holdings.

Here's the weekly chart for Alphabet.

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Courtesy of MetaStock Xenith

Alphabet trades at $828.55, up 6.5% year to date and in bull market territory 23.2% above its June 27 low of $672.66. The stock set an all-time intraday high of $838.50 on Tuesday. The close was below the Oct. 24 low of $829.04, which defines a "key reversal" day.

The weekly chart for Alphabet is positive but overbought with the stock above its key weekly moving average of $807.66 and well above the 200-week simple moving average of $589.90. The weekly momentum reading is projected to slip to 83.20 this week down from 83.68 on Oct. 21, becoming less overbought versus the threshold of 80.00.

Investors looking to buy Alphabet should consider doing so on weakness to $770.77 and $756.36, which are key levels on technical charts until the end of 2016, and until the end of October, respectively. Investors looking to reduce holdings should consider selling strength to $854.86, which is a key level on technical charts until the end of 2016.

This article is commentary by an independent contributor. At the time of publication, the author held no positions in the stocks mentioned.