He sees a warning flag in the fact that a good portion of the IPO proceeds were targeted at cashing out earlier investors.
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But having that central controller of what can appear on iOS devices essentially banning material on taste grounds raises a little warning flag.
Large-short positions that have been building in some big-bank stocks could be a warning flag to investors who saw a nice performance in the financial sector last year and are trawling for their next big winner.
What is relatively new is the zeal in medical-research circles to use extensive biomarker testing as a quantifiable measure of a person's overall health and, possibly, as a warning flag for potential health problems down the road.
The National Weather Service said a red flag warning was in effect until Friday evening.
Generally, a bearish momentum divergence is a red flag warning signal, which often presages a pullback or correction.
The National Weather Service in San Diego said a red flag warning was in effect until Friday evening.
And, this whole medication-forgetting incident is a red flag warning.
The blaze quickly moved through the area as Southwest Idaho remained under a red flag warning Sunday and Monday because of high temperatures, low humidity and high winds conditions conducive to explosive and destructive fires.
"It also is kind of a warning sign or red flag that hey, we really need to tackle this problem, " he said.
Friday's warning was "a major red flag" and "quite a bit more expansive" than past alerts, said Kathleen Fairfax, vice president for global education at Arizona State University.
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