Going into the close of trading on Tuesday, a good stock remained good, a bad stock stayed bad, and a trio of stocks moved from "average" to "avoid."

Our Short Term PowerRatings Upgrades and Downgrades table lets short term traders see the largest changes in Short Term PowerRatings as those changes happen intraday. Our Upgrades and Downgrades table, which updates at 10:30 a.m., 1:30 p.m., and 3:45 p.m. Eastern, is a good way for traders to find out if a stock that began the day with a high Short Term PowerRating is still a good opportunity.

Traders looking to short stocks can use the table to make sure that the low PowerRating stock they wanted to bet against last night is still showing a low PowerRating, signifying that the stock may have moved too far too fast.

We are big fans of buying weakness and selling strength. And one of our favorite forms of weakness to buy is intraday weakness. Often, when stocks reverse and begin moving higher, the change in sentiment from bullish to bearish occurs after yet another bearish session has begun. For traders who look to buy with a limit order below the previous day's close—another preferred way to buy pullbacks—this intraday weakness helps establish positions at what tend to be very favorable prices. Traders can use our Short Term PowerRatings Upgrades and Downgrades table to see when a stock's PowerRating ticks into the 8 or higher, "consider buying," zone that many times reflects just that sort of buyable intraday weakness.

Knowing intraday changes in Short Term PowerRatings can be helpful for betting against stocks as well. When a stock's Short Term PowerRating slips from the "average" range into the low, "avoid buying" area of 3 or less, a trader knows instantly that the stock is vulnerable to correction and worth a look as a potential short selling candidate.

TXCO Resources Inc. (TXCO | Quote | Chart | News | PowerRating). Short Term PowerRating 8.

Fannie Mae (FNM | Quote | Chart | News | PowerRating). Short Term PowerRating 3.

Alexander's Inc. (ALX | Quote | Chart | News | PowerRating). Short Term PowerRating 3 (began session at 4)

Empire Resorts (NYNY | Quote | Chart | News | PowerRating). Short Term PowerRating 3 (began session at 4)

Hurco Companies Inc. (HURC | Quote | Chart | News | PowerRating). Short Term PowerRating 3 (began session at 5)

Not only did both Empire Resorts and Hurco Companies end the day with Short Term PowerRatings of 3, but both stocks at one point in the session had Short Term PowerRatings as low as 2. Both TXCO Resources and Fannie Mae held their respectively high and low Short Term PowerRatings for the duration of the trading day.

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David Penn is Senior Editor at TradingMarkets.com.