Hazardous Weather Outlook
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
940 FLCA42 TJSJ 110903 HWOSJU Hazardous Weather Outlook National Weather Service San Juan PR 503 AM AST Mon Aug 11 2025 AMZ711>745-PRZ001>013-120915- 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- 503 AM AST Mon Aug 11 2025 This Hazardous Weather Outlook is for portions of Puerto Rico. .DAY ONE...Today and Tonight .Lightning...Isolated thunderstorms, particularly across interior to W-NW PR and possibly downwind of El Yunque. Stay alert and be prepared to take shelter if storms develop. .Excessive Rainfall...Flooding in urban areas, roads, small streams, and washes, particularly across interior to W-NW PR and possibly downwind of EL Yunque. 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 urban and coastal areas of PR. .Rip Currents...Life-threatening rip currents are possible in the surf zone, particularly across northern to eastern PR and Culebra. Isolated stronger rip currents may occur elsewhere, especially near piers, jetties, and channels. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Excessive heat and excessive rainfall concerns are expected to persist throughout the forecast period. However, excessive rainfall hazard risks will likely increase tonight into Tuesday, as trailing moisture from Invest 96L heighten the potential for showers and thunderstorms, thereby raising the risk of flooding. A moderate risk of rip currents will continue, possibly becoming high on Saturday and Sunday. By late tonight through at least early Thursday, a Saharan Air Layer (SAL) with moderate to high concentrations of Saharan Dust will move over the region, promoting hazy skies and deteriorating air quality. Invest 97L over the eastern tropical Atlantic currently has a high cyclonic formation chance during the next 2 to 7 days. Residents and visitors should monitor the development of this tropical wave as the system moves across a favorable area of formation. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. $$ AMZ716-726-VIZ001-002-120915- St. Thomas St. John adjacent Islands-St Croix- Nearshore Atlantic and adjacent Caribbean Coastal Waters- 503 AM AST Mon Aug 11 2025 This Hazardous Weather Outlook is for portions of USVI. .DAY ONE...Today and Tonight .Excessive Rainfall...Ponding of water in roads and poorly drained areas. There is a low chance of localized urban and small streams flooding. .Excessive Heat...This level of heat affects primarily those individuals extremely sensitive to heat, especially when outdoors without effective cooling and/or adequate hydration. .Rip Currents...Life-threatening rip currents are possible in the surf zone, particularly across beaches of St. Thomas and St. John. Isolated stronger rip currents may occur elsewhere, especially near piers, jetties, and channels. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Excessive heat concerns are expected to persist throughout the forecast period. However, excessive rainfall hazard risks will likely increase tonight into Tuesday, as trailing moisture from Invest 96L heighten the potential for showers and thunderstorms, thereby raising the risk of flooding. A moderate risk of rip currents will continue, possibly becoming high on Saturday and Sunday. By late tonight through at least early Thursday, a Saharan Air Layer (SAL) with moderate to high concentrations of Saharan Dust will move over the region, promoting hazy skies and deteriorating air quality. Invest 97L over the eastern tropical Atlantic currently has a high cyclonic formation chance during the next 2 to 7 days. Residents and visitors should monitor the development of this tropical wave as the system moves across a favorable area of formation. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed. $$