预报说了什么，没说什么
中国气象局城市预报于9月19日20时发布：西安20日小雨、21日仍可能有雨，此后一周还将多次出现降水；汉中20日至21日有小雨，23日前后降水更明显。预报会滚动调整，本页不能替代当天临行查询。
小雨不等于所有地点安全，也不等于一定看不到迁徙鸟。城市公园的铺装路与秦岭沟谷风险完全不同；是否出发要同时看降雨强度、预警、能见度、道路和保护地开放状态。
把山地目标改成低风险观察
降雨日优先选择有管理、可快速撤离的城市公园或正规湿地栈道，把秦岭山脊、沟谷和土路行程延期。汉中或洋县若持续降雨，不要为朱鹮等目标种进入稻田机耕路、河岸泥地或村庄生产区域。
清晨能见度差时降低车速，不在桥面、弯道或路肩突然停车看鸟。团队设置明确折返点；出现雷声、涨水、落石、浓雾、封路或手机失去稳定信号中的任何一项，就应立即撤回。
雨天记录和装备清单
使用有帽檐的防水外层、防滑鞋、镜头雨罩、干燥袋和备用保暖层；雨伞在山路和群体观察中容易遮挡视线，不应替代防水衣。避免在雷雨中使用高位三脚架，也不要站在孤立高树或水边。
雨后鸟类可能短时集中取食，但不能以此诱发追逐。留在步道，先听后看，用较低快门或提高感光度解决弱光，而不是靠近鸟。记录预报发布时间和现场天气，便于日后解释观察偏差。
What the forecast says—and does not say
The CMA city forecast issued at 20:00 on September 19 showed light rain in Xi'an on the 20th and possible rain on the 21st, with several more wet periods during the week. Hanzhong showed light rain on the 20th–21st and stronger showers around the 23rd. Forecasts update continuously, so this page cannot replace a departure-day check.
Light rain does not make every site safe, nor does it guarantee poor migration. A paved city park and a Qinling gully carry different risks. Decide from rainfall intensity, warnings, visibility, roads and protected-area access together.
Replace mountain targets with lower-risk observation
On wet days prefer managed city parks or formal wetland boardwalks with quick exits, and postpone ridges, gullies and dirt tracks. Around Hanzhong or Yangxian, persistent rain is never a reason to enter farm tracks, muddy riverbanks or village working land for Crested Ibis or another target.
Reduce speed in poor dawn visibility and never stop suddenly on a bridge, bend or shoulder for a bird. Set a clear turnaround point. Thunder, rising water, falling rocks, dense fog, a road closure or loss of stable phone signal should each trigger immediate retreat.
Rain equipment and field records
Carry a hooded waterproof shell, grippy shoes, lens cover, dry bag and spare warm layer. Umbrellas obstruct sightlines on paths and in groups and are not a substitute for rainwear. Do not use a high tripod in thunder or stand beside isolated trees or water.
Birds may feed intensely after rain, but that never justifies pursuit. Stay on paths, listen before looking, and solve low light with support or camera settings rather than distance. Record the forecast issue time and field weather so later interpretation includes observer conditions.