Hazardous Weather Outlook
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
816 FLCA42 TJSJ 220840 HWOSJU Hazardous Weather Outlook National Weather Service San Juan PR 440 AM AST Fri Aug 22 2025 AMZ711>745-PRZ001>013-231000- San Juan and Vicinity-Northeast-Southeast-Eastern Interior- North Central-Central Interior-Ponce and Vicinity-Northwest- Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques- The nearshore and off shore Atlantic and Caribbean Coastal Waters- 440 AM AST Fri Aug 22 2025 This Hazardous Weather Outlook is for portions of Puerto Rico. .DAY ONE...Today and Tonight .Lightning...Isolated thunderstorms, spreading westward across the region from a passsing tropical wave. A higher risk is likely across southwestern Puerto Rico in the afternoon. Stay alert and be prepared to take shelter if storms develop. .Excessive Rainfall...Flooding in urban areas, roads, small streams, and washes, particularly across southwestern Puerto Rico this afternoon and northeastern Puerto Rico tonight. There is a low chance of isolated flash floods. Elsewhere, plan for water ponding on roads and in poorly drained areas. .Excessive Heat...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Those extremely sensitive to heat face the highest risk. Some health systems and heat-sensitive industries could be affected. These conditions are most likely across most lower elevations and urban areas of Puerto Rico. .Marine Conditions...Small craft should exercise caution, particularly across the Atlantic waters. .Rip Currents...Life-threatening rip currents are likely in the surf zone, particularly across northern Puerto Rico. These life- threatening conditions are possible across western Puerto Rico, Vieques and Culebra, with isolated stronger rip currents possible elsewhere, especially near piers, jetties and channels. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Excessive rainfall from a passing tropical wave (99L) is expected to continue on Saturday, then become more localized with afternoon convection. Excessive heat risks persist through the period. Swells from Hurricane Erin will maintain a high rip current risk through midweek, with hazardous seas expected to develop from Saturday night through Tuesday. Breezy to locally windy conditions are expected to exacerbate marine hazards, particularly on Sunday into Monday. A Saharan Air Layer is expected to bring hazy skies and reduced air quality from Sunday through Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. $$ AMZ716-726-VIZ001-002-231000- St. Thomas St. John adjacent Islands-St Croix- Nearshore Atlantic and adjacent Caribbean Coastal Waters- 440 AM AST Fri Aug 22 2025 This Hazardous Weather Outlook is for portions of USVI. .DAY ONE...Today and Tonight .Lightning...Isolated thunderstorms, associated to a passing tropical wave. Stay alert and be prepared to take shelter if storms develop. .Excessive Rainfall...Ponding of water in roads and poorly drained areas. There is a low chance of localized urban and small streams flooding. .Excessive Heat...This level of heat affects primarily those individuals extremely sensitive to heat, especially when outdoors without effective cooling and/or adequate hydration. .Marine Conditions...Small craft should exercise caution, particularly across the Atlantic waters. .Rip Currents...Life-threatening rip currents are possible in the surf zone, particularly across St Thomas and St John. Isolated stronger rip currents may occur elsewhere, especially near piers, jetties, and channels. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Excessive rainfall from a passing tropical wave (99L) is expected to continue on Saturday. Excessive heat risks are expected to persist throughout the forecast period. Swells from Hurricane Erin will maintain a moderate rip current risk through Saturday, increasing to high on Sunday, with hazardous seas developing Saturday night through Tuesday. Breezy to locally windy conditions will exacerbate marine hazards, particularly Sunday into Monday. A Saharan Air Layer is expected to bring hazy skies and reduced air quality from Sunday through Tuesday. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. $$