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Red flag (idiom), a literal or metaphorical warning Red flag (American slavery), signal of an upcoming slave sale Red flag warning, issued by the National Weather Service in the United States
The term "red flag" is used, e.g., during screening of communications, and refers to specific words or phrases encountered that might indicate relevance to the case. For example, email spam filters make use of such "red flags". A red flag can also be used to indicate a small problem that could lead to larger problems in the future. [6]
The PDS red flag warning below was issued by the National Weather Service in Reno, Nevada, on December 19, 2017. [7] On August 3, 2018, the National Weather Service in Reno, Nevada, issued another PDS red flag warning to communicate the threat of life-threatening fire danger due to strong gusty winds and low humidity.
“A Red Flag Warning is in effect for today, meaning conditions will be favorable for extreme fire behavior. Avoid all outside burning and welding.” The warning is in effect from 1 p.m. Tuesday ...
In politics, a red flag is predominantly a symbol of left-wing ideologies, including socialism, communism, anarchism, and the labour movement. The originally empty or plain red flag has been associated with left-wing politics since the French Revolution (1789–1799). The red flag and red as a political colour are the oldest symbols of socialism.
Following a red flag being shown, the exit of the pit lane is closed and cars must proceed to the pit lane slowly without overtaking, lining up at the pit exit. [7] From 2005, a ten-minute warning is given before the race is resumed behind the safety car , which leads the field for a lap before it returns to the pit lane. [ 8 ]
Red flag criteria is generally when relative humidity is at 15% or less, combined with sustained winds and/or gusts of 25 mph or greater. Both of these conditions must occur simultaneously for at ...
[5] [6] However, the use of a red flag to signal no quarter does not appear to have been universal among combatants. Black flags have been used to signify that quarter would be given if surrender was prompt; the best-known example is the Jolly Roger used by pirates to intimidate a target crew into surrender. By promising quarter, pirates ...