灾害 · 圣约翰斯河洪水
日内瓦附近圣约翰斯河水位持续上涨，高水位预报时间转至周一
原语言视频
译自英文原文。
周三，即11月4日，美国东部标准时间上午8:30，佛罗里达州塞米诺尔县哈尼湖上游的河流水位测得8.5英尺，比8.0英尺的洪水水位高出半英尺。美国国家气象局墨尔本办公室当时报告称出现轻度洪水，并预报未来几天将出现中度洪水。这是早间观测，并非经确认的晚间或实时读数。6
最新经核实的预报称，11月9日周一上午水位将达到9.8英尺，此后还可能继续上涨。预报水位距离警报所述10英尺影响水位仅差0.2英尺。这并不能证明河水会达到10英尺，但也不能证明水位上涨会在周一上午结束。6
预报时间推迟，不代表警报解除
不应将较低的数字视为已经确定的最终峰值。周三的警报明确表示，周一上午之后水位仍可能继续上涨，并称周末晚些时候至下周初可能接近重大洪水水位。这是对洪水可能加剧的预报，并非宣布重大洪水已经开始。7
所有这些测量值和水位阈值均适用于日内瓦附近哈尼湖上游的圣约翰斯河。警报另列出6.0英尺的满岸水位和8.0英尺的洪水水位。这是两个不同的标记；周三早间的水位已经超过两者。6
出行通道也可能中断
对于居住在低洼地带房屋中的人来说，重要的不只是水位计上的数字。警报描述了洪水会在何种水位变得更严重地影响住宅区，并使服务这些区域的道路无法通行。达到10英尺时，气象局对影响的描述十分明确：6
低洼地区的住宅遭受的洪水影响会变得更加严重。许多次要道路将无法通行，限制居民进出住宅。
下一次公告计划于周三，即11月4日，美国东部标准时间晚上11点发布。这次更新将是下一次明确的获取最新观测、澄清警报状态，以及查看预报水位是接近还是远离10英尺影响水位的机会。本文未能确认此后有新的读数或警报取消。6
眼下的安全指示不取决于水位差几分之一英尺：不要开车穿过被淹区域或绕过路障，并在河岸附近步行时保持谨慎。预报时间已推迟，但核心关切依然是：上涨的水位是否会让低洼地带的住宅更难居住，也更难抵达或离开。6
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来自 10 家媒体的 17 个来源· 引用最多的优先
Air Sports Netusairnet.com1
Arizona Water Observatoryasu.edu1
Central Florida Public Mediacfpublic.org1
Defcon Leveldefconlevel.com1
Storm Station 247stormstation247.com1
Warning Vectorwarningvector.com1
- 首次报道于
- Flood Warning
播出原貌
- The St. Johns River climbed half a foot above flood stage.
- The forecast brings it close to a level where flooding worsens for low-lying homes and roads become impassable. Residents along this reach face rising water into early next week.
- Will the river reach the point where more significant flooding threatens homes and cuts off road access?
- Heavy rainfall pushed the river higher near Geneva, in Florida's Seminole County. The affected stretch is the St. Johns above Lake Harney. The measurements and flood thresholds here apply to that reach of the river.
- The river measured 8.5 feet at eight-thirty Wednesday morning, November fourth. Flood stage here is 8.0 feet. That puts the observation half a foot above the flooding threshold. Minor flooding was occurring, with moderate flooding forecast.
- That measurement describes Wednesday morning's conditions. A fresher reading hasn't been confirmed, so it doesn't tell us how high the water stands this evening.
- The river rose from 8.3 feet Tuesday evening to 8.5 feet Wednesday morning, a gain of 0.2 feet in twelve hours. Each observation was also the highest reading in its preceding twenty-four-hour period.
- The warning lists bankfull stage at 6.0 feet and flood stage at 8.0 feet. Those are separate markers. Wednesday's water level had passed both, and the forecast called for it to keep climbing over the next few days.
- The earlier forecast put the river at 9.9 feet Sunday evening. Wednesday's revision calls for 9.8 feet Monday morning, November ninth. That's a tenth of a foot lower, with the expected high-water level shifted into early next week.
- The river could rise farther after Monday morning. The outlook also allows for water approaching major flood stage late this weekend into early next week. Monday's forecast level therefore leaves open how high the river will ultimately rise.
- At ten feet, flooding of low-lying homes would become more significant, and many secondary roads would be impassable. That could limit people's access to their homes. These are the expected consequences at that level; those particular impacts haven't been confirmed.
- The Monday forecast is 0.2 feet below that impact level. Further rises could close that gap, but the forecast doesn't yet say the river will reach ten feet.
- The morning bulletin continued the warning until further notice. Its expiration fields conflict, and the warning's live evening status isn't clear. The next statement was scheduled for eleven tonight, when residents could get a newer observation and forecast.
- Motorists should stay out of flooded areas and never drive around barricades. People walking near riverbanks should use caution. The rising water threatens both low-lying homes and the roads people depend on to reach them.
译文更新于
