A fast, reactive screen for momentum / velocity / acceleration of price and volume across the US tape — built to catch names where the impulse is JUST starting to fire, while an entry still exists. Stocks that already ran are demoted, not surfaced. Reactive timing context, regime-aware; not a validated alpha signal and never a P(up) — short-horizon direction is a coin-flip and momentum decays in stress.一个对全美股价格与成交量的动量／速度／加速度进行快速、灵敏扫描的工具 — 专门捕捉冲量刚刚启动、入场窗口仍在的个股。已经大涨的股票会被降权而非展示。这是对时机的灵敏背景判断，并感知市场状态；并非经验证的阿尔法信号，也从不给出涨跌概率 — 短周期方向接近抛硬币，且动量在承压行情中衰减。
Acceleration turning up NOW with volume confirming, and the move has not yet run (small 20-day gain, not stretched above its averages). Ranked by impulse score; “NEW today” = the acceleration first fired this session.加速度此刻转向上行、成交量确认，且涨势尚未展开（20日涨幅小、未明显高于均线）。按冲量分排序；“今日新”= 本交易日首次点火。
Still accelerating, but already up enough that the freshest entry has passed. Trail / wait for a pullback.仍在加速，但已上涨到错过最佳入场点。可跟踪或等回调。
Quiet price, but volume is starting to perk up — a base that may be about to fire. Watchlist, not a buy yet.价格安静，但成交量开始活跃 — 可能即将启动的基底。观察名单，尚非买入。
Accelerating, but the move has ALREADY happened (big 20-day gain / stretched above the averages). Shown for awareness — wait for a pullback, do not chase.正在加速，但涨势已经发生（20日大涨／远高于均线）。仅作提示 — 等回调，勿追高。
Acceleration is turning down / the trend is weakening. The opposite of an entry — avoid.加速度转向下行／趋势走弱。与入场相反 — 回避。
Method & honesty: scores are a within-universe percentile of a fixed, legible composite (no learned weights). Computed on daily end-of-day bars across the S&P-1500 breadth universe; the public site rebuilds once daily after the US close, so this is the night-before tape, not an intraday feed. Direction is never claimed — engine/velocity.py and the signal lab record that short-horizon P(up) is a measured coin-flip and momentum’s edge is regime-switched (it decays in stress). Treat this as a reactive timing/context screen to narrow where to look, confirmed on your own chart before acting. Nothing here is investment advice or a scored input to any other model.方法与诚实声明：分数是固定、可读的合成指标在全样本中的百分位（无学习权重）。基于标普1500广度样本的日终数据计算；公开站点每日美股收盘后重建一次，因此这是“前一晚”的行情，并非盘中实时数据。从不声称方向 — engine/velocity.py 与信号实验室已记录：短周期涨跌概率接近抛硬币，且动量优势随市场状态切换（承压时衰减）。请将其视为缩小关注范围的灵敏时机／背景工具，在自己的图表上确认后再行动。本页内容均非投资建议，也不作为任何其他模型的评分输入。