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灾害 · Moenkopi Wash

Moenkopi Wash 洪水警报延长至上午 7 点；水位计读数远高于重大洪水水位

夜间两度延长警报，使 Moenkopi Wash 洪水警报持续时间超过原定截止时间和预报的洪峰时间。实际洪峰仍未得到确认。

文字 阅读需 4 分钟 · 23 个来源

HeyDex

原语言视频

译自英文原文。

山地标准时间周一上午 7 点是 Moenkopi Wash 洪水警报的最新截止时间——并非解除警报。国家气象局弗拉格斯塔夫办事处两度在夜间延长警报后称，强降雨过后，水位计读数已“远高于重大洪水水位”。警报目前比原定到期时间延长了六小时；原始警报指出，Moenkopi Village 下游低洼地带的住宅和农田易受洪水影响。⁠14⁠1

截至本报道于 11 月 2 日山地标准时间上午 6:27 的信息快照，最新警报距离到期约还有 33 分钟。比倒计时更重要的是，仍未得到确认的情况：水位是否已达峰并开始下降。最新警报摘录未提供具体水位数值，也未确认已观测到洪峰。⁠14⁠20

远离河道，不要步行或驾车进入洪水中。靠近河道查看渡口或检查田地，会使人置身于警报所描述的危险之中。警报预定到期，并不保证洪水已经退去，也不代表被淹道路已经安全。

此次警报涉及亚利桑那州中北部科科尼诺县的 Moenkopi Wash。水位计的参考地点是 Tuba City；这并不意味着 Tuba City 全市都遭遇洪水。原始警报明确提及受威胁住宅和农业用地的区域，主要是 Moenkopi Village 下游地带。⁠1

同一警报，夜间两度延长

  1. 11 月 1 日星期日，山地标准时间下午 4:58

    国家气象局弗拉格斯塔夫办事处发布山洪警报，称洪水已经发生，并将初始到期时间定为周一凌晨 1 点。

    1
  2. 11 月 2 日星期一，山地标准时间凌晨 12:37

    预报人员将警报延长至凌晨 4 点。

    12
  3. 11 月 2 日星期一，山地标准时间凌晨 3:55

    警报进一步延长，持续至上午 7 点；警报称水位计读数远高于重大洪水水位。

    1314

这是同一警报的连续延长，并非两起独立事件之间有一段安全间隔。原定凌晨 1 点的截止时间已被取代，之后的凌晨 4 点截止时间也同样如此。因此，只载有第一条警报的网页并未完整呈现夜间的危险情况。⁠12⁠13

三个含义不同的数字

原始警报包含一项观测值、一项阈值和一项预报。三者不应混为一谈，当作河道当前状况的单一描述。周日下午 4:45 山地标准时间，Tuba City 附近的水位计读数为 26.0 英尺。警报列出的洪水水位为 27.0 英尺，并预报周一山地标准时间凌晨 5 点将出现 29.45 英尺的洪峰。⁠1

26 英尺的观测值比所列洪水水位阈值低 1 英尺，但这次观测发生在原始警报发布之前，且比之后所称的重大洪水水位高出许多小时。它只是历史背景，并非当前水位；它描述的也是水位计所测的水位，而非住宅内、道路上或农田中的积水深度。⁠1⁠14

原始警报最初称河道水位已高于行动水位。按照国家气象局的一般术语，行动水位是需要为可能出现的高水位采取预防措施的水位；它不能与洪水水位互换使用。之后关于水位远高于重大洪水水位的描述，意味着情况严重得多，尽管现有摘录没有为其提供具体读数。⁠1⁠4⁠14

预报中的洪峰水位比原始警报所列的洪水水位高出 2.45 英尺。但到了凌晨 5 点，并不意味着这项预报就成了观测结果。没有观测到峰值及其后的读数，就无法确认水位已经转而下降。较晚发布的警报原定持续至预报洪峰时间之后两小时。⁠1⁠13

威胁比损失情况更明确

原始警报指出，水位达到 27 英尺时，洪水便开始逼近 Moenkopi Village 下游的住宅，并淹没河沿岸的农田。这说明了风险所在：随着冲刷河道水位上涨，住所和耕地都面临威胁。但这本身并不能证实某一处住宅已经进水，也无法确定有多少农田被淹。⁠1

本报道所依据的现有记录中，没有任何经独立确认的报告称住宅被淹、道路封闭、人员撤离或有人获救。检索到的警报摘录也没有提供完整的、针对特定社区的防护指示。这些是现有信息中的缺漏，并不代表没有造成影响，也不代表不存在进一步指示。

下一个关键进展是山地标准时间上午 7 点对警报的处置决定：预报人员是否再次延长警报、取消警报，或任其到期。居民还需要了解一份显示河道水势变化方向的最新观测。警报状态改变和水位下降是两件不同的事。只有后者才能开始说明住宅、农田和道路面临的威胁是否正在减弱。

来源10

在此处引用的来源中，National Weather Service最先发布，比本报道播出早15小时。
  1. National Weather Service
  2. HeyDay News

1篇早期文章作为背景资料参阅。8家媒体未注明日期：forth.newsNOAAAtmostormfloodriskhere.comgovonestop.comStorm Station 247

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来自 10 家媒体的 23 个来源· 引用最多的优先

播出原貌
  1. Moenkopi Wash has risen well above major flood stage.
  2. Low-lying homes and crop fields are at risk, with the flash flood warning extended until seven a.m. Mountain Standard Time.
  3. People near the wash still need to know whether the water has peaked and begun to fall.
  4. Moenkopi Wash is in Coconino County, in north-central Arizona. The original warning identified lower Moenkopi Village homes and agricultural land as vulnerable. Tuba City is the reference location for the gauge monitoring the rising water.
  5. Stay clear of the wash, and don't enter floodwater on foot or in a vehicle. Approaching the water to check a crossing or a nearby field puts you in the area the warning says is dangerous.
  6. The weather service described the gauge as having risen “well above major flood stage” after heavy rain. That's a more serious description than the earlier rise above action stage, which signals a need for precautions as water rises.
  7. Flash flooding was already occurring when the original warning went out Sunday afternoon. Forecasters then extended the same warning twice overnight, keeping it in force beyond both its original deadline and the time they had forecast for the peak.
  8. The original warning ran until one a.m. Monday. The first overnight extension moved that deadline to four a.m. The next moved it to seven a.m. The danger continued through those earlier deadlines as forecasters kept the warning in force.
  9. At six twenty-seven Monday morning, the latest warning still had about thirty-three minutes to run. Seven a.m. marks the warning's expiration. Floodwater can remain dangerous beyond that deadline, and a flooded crossing can still be unsafe.
  10. The gauge near Tuba City recorded its earlier reading Sunday afternoon, before either overnight extension. That location identifies where the water was measured. The warning's specific concern for homes and fields centers on lower Moenkopi Village.
  11. The original figures describe three different things: an earlier water level, the flood-stage threshold, and a forecast peak. Keeping those separate is essential because the later major-flood-stage warning describes conditions many hours after that first measurement.
  12. The gauge read 26 feet Sunday afternoon. The original warning set flood stage at 27 feet. It forecast a 29.45-foot crest for five a.m. Monday. Those figures pair an earlier observation with a threshold and a prediction.
  13. The earlier reading was one foot below that flood-stage threshold. The predicted crest would be 2.45 feet above it. But the five a.m. forecast time has passed, and a forecast alone can't tell residents whether the water has turned downward.
  14. The original warning identifies 27 feet as the level where water begins encroaching on lower Moenkopi Village homes and flooding crop fields along the river. That threshold describes the threat to shelter and cultivated land as the wash rises.
  15. A current numerical gauge reading and the actual crest's height and time haven't been confirmed. The next warning decision is due at seven a.m., when forecasters could extend or cancel the alert. Fresh observations are still needed to show whether the water threatening homes, fields and routes has begun to recede.

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