A series of slow-moving weather systems has precipitated extensive flood watches and warnings across a dozen U.S. states, spanning from the Southern Plains to the Mid-Atlantic region.

一系列移動緩慢的天氣系統導致美國十幾個州發布廣泛的洪水監測與警告，範圍從南部大平原延伸至中大西洋地區。

The current atmospheric instability is characterized by 'training' storms, wherein convective cells repeatedly traverse the same geographical coordinates. This phenomenon, coupled with previously saturated soil profiles in regions such as Eastern Kentucky and the Deep South, has heightened the probability of rapid runoff and flash flooding. In the Southern Plains, specifically within the Texas Hill Country and the Austin-San Antonio corridor, the National Weather Service (NWS) has identified potential for life-threatening flooding, with isolated precipitation totals estimated up to five inches. Concurrently, southwest Texas faces additional risks involving damaging hail and tornadic activity.

目前的大氣不穩定特徵為「訓練式」風暴，即對流單元重複經過相同的地理座標。這種現象，加上肯塔基州東部與深南方地區的土壤先前已趨於飽和，增加了快速逕流與快閃洪水的機率。在南部大平原，特別是德州丘陵地區與奧斯汀-聖安東尼奧走廊，國家氣象局 (NWS) 已指出可能出現危及生命的洪水，局部地區估計降雨量高達五英吋。同時，德州西南部還面臨破壞性冰雹與龍捲風活動的額外風險。

In the Lower Mississippi Valley and the Gulf Coast, a stalled boundary is projected to maintain storm activity, particularly impacting urban centers such as New Orleans and Atlanta. The NWS has indicated that hourly rainfall rates of one to three inches may occur, potentially compromising structural integrity and rendering transportation arteries impassable. Further north, a warm front is facilitating the movement of heavy precipitation into the Ohio Valley and Central Appalachians, with flood watches extending into southwestern Pennsylvania and western Maryland due to the risk of rapid accumulation in mountainous terrain.

在密西西比河下游谷與墨西哥灣沿岸，一個停滯的鋒面預計將維持風暴活動，對紐奧良與亞特蘭大等城市中心影響尤深。NWS 指出，每小時降雨量可能達到一至三英吋，可能危及建築結構完整性並導致交通主幹道無法通行。再往北，一個暖鋒正將強降雨帶入俄亥俄谷與中阿巴拉契山脈，由於山區有快速積水的風險，洪水監測範圍已延伸至賓夕法尼亞州西南部與馬里蘭州西部。

Conversely, in Middle Tennessee, the NWS Nashville office reports a persistent rainy pattern through the end of May. While this system is not expected to produce widespread flooding, the anticipated accumulation of up to three inches is projected to mitigate existing severe and extreme drought conditions identified by the U.S. Drought Monitor. This regional variance underscores a dichotomy between the acute flash-flood risks in the Southeast and the gradual hydrological recovery in the Tennessee Valley.

相反地，在田納西州中部，NWS 納什維爾辦公室報告指出，直到五月底將維持持續降雨模式。雖然該系統預計不會導致廣泛洪水，但預計高達三英吋的積雨量將緩解美國乾旱監測器所識別的嚴重及極端乾旱狀況。這種區域差異凸顯了東南部急性快閃洪水風險與田納西谷逐漸恢復水文狀態之間的對比。

The region remains under significant hydrological threat as multiple rounds of precipitation continue to interact with slow-moving fronts over the next 48 hours.

由於未來 48 小時內多輪降雨將持續與移動緩慢的鋒面相互作用，該地區仍處於嚴重的水文威脅之下。