因應暴雨可能持續影響薩爾瓦多及尼加拉瓜各地,當地官員疏散了約2000人[16]。為應對本次災情,薩爾瓦多政府對境內發出了黃色預警,並按國家防災民防系統(西班牙语:Sistema Nacional de Protección Civil de El Salvador)指示分配約52000名警員、緊急救援人員及軍人戒備[17]。
當地政府提醒,阿加莎所帶來的暴雨可能引發火山泥流,並加劇災情;不過,在咖啡田工作的人認為,降雨能沖走咖啡樹上的火山灰,對他們有幫助[19]。危地馬拉國家地震、火山、氣象和水文研究所(西班牙语:Instituto Nacional de Sismología, Vulcanología, Meteorología e Hidrología)表示,當地在5月29日的總雨量達360毫米[20]。南部地區出現小規模的山泥傾瀉,阻塞了道路交通[21]。
5月30日下午,當地傳媒報導,瓜地馬拉一共15人死亡,22人失蹤[26]。初部報告顯示,至少3500所房屋受損[27],超過11萬人需要撤離[28],逾2萬人無家可歸[29]。部分地區錄得超過910毫米雨量,是逾60年來最高的雨量紀錄,令阿加莎成為有史以來吹襲該國造成最高總雨量的熱帶氣旋,比1998年颶風米奇更多[30] 。翌日,死亡人數增至92人,另有95人受傷[31]。根據危地馬拉國家減災協調中心(西班牙语:Coordinadora Nacional para la Reducción de Desastres)於災後發表的報告,超過34萬人受災,約10萬人流離失所[32]。
災後,多國向瓜地馬拉提供援助。當中巴西贈送了2萬噸玉米及5千噸飯,而古巴亦派遣了一隊醫療隊協助救災。此外,歐盟對瓜地馬拉提拱了240萬美元援助,世界銀行則考慮借出8500萬美元,作災後重建等[37]。經歷颶風斯坦及颶風米奇後,瓜地馬拉遭受重大損失,加劇了國內社會混亂的狀況和經濟的不穩定性,並大幅增加了國內的孤兒人數,並導致中美洲三角(英语:Northern Triangle of Central America)(即瓜地馬拉、薩爾瓦多及宏都拉斯三國)出現一波兒童移居潮[32]。2011年,共有4059名兒童為了移民至墨西哥及美國,在中美洲三角地區邊境被拘捕,數字逐年上升,在2014年升至超過6萬9千人;同時,從該三國遷至墨西哥的人口在2009年至2014年間上升了7至13倍[32]。
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