Hazardous Weather Outlook
Issued by NWS San Juan, PR
Issued by NWS San Juan, PR
687 FLCA42 TJSJ 160919 HWOSJU Hazardous Weather Outlook National Weather Service San Juan PR 519 AM AST Wed Jul 16 2025 AMZ711>745-PRZ001>013-170930- 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- 519 AM AST Wed Jul 16 2025 This Hazardous Weather Outlook is for portions of Puerto Rico. .DAY ONE...Today and Tonight .Lightning...Isolated thunderstorms, particularly across the coastal waters, the interior and western PR. Stay alert and be prepared to take shelter if storms develop. .Excessive Rainfall...Flooding in urban areas, roads, small streams, and washes, particularly across portions of PR during the afternoon. There is a low chance of isolated flash floods. Elsewhere, plan for water ponding on roads and in poorly drained areas. .Excessive Heat...If prolonged period of heavy rain do not happen across the lower elevations and urban areas of Puerto Rico during the peak heating hours, we can observe an elevated heat risk. Stay tuned for any forecast update. 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. .Wind...Breezy conditions (18-22 kts | 21-25 mph), particularly across the coastal areas. Unsecured items could blow around. .Marine Conditions...Small craft should exercise caution, particularly across the Atlantic Waters. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday An elevated excessive heat threat will continue through at least early next week across most urban coastal locations. Isolated thunderstorms are expected each afternoon over portions of the interior and western PR. Breezy conditions and a moderate risk of rip currents will prevail through the workweek. A dense Saharan Air Layer will return on Thursday and Friday, promoting hazy skies and reduced visibilities. .SPOTTER INFORMATION STATEMENT... Spotter activation is encouraged. Please relay any information about flooding, winds, waves, and rip currents to the National Weather Service in San Juan. $$ AMZ716-726-VIZ001-002-170930- St. Thomas St. John adjacent Islands-St Croix- Nearshore Atlantic and adjacent Caribbean Coastal Waters- 519 AM AST Wed Jul 16 2025 This Hazardous Weather Outlook is for portions of USVI. .DAY ONE...Today and Tonight .Lightning...Isolated thunderstorms, particularly across the surrounding waters. Stay alert and be prepared to take shelter if storms develop. .Excessive Rainfall...Ponding of water in roads and poorly drained areas. There is a low chance of localized urban and small streams flooding. .Excessive Heat...If prolonged period of heavy rain do not happen across the lower elevations and urban areas of the US Virgin Islands during the peak heating hours, we can observe a slight heat risk. This level of heat affects primarily those individuals extremely sensitive to heat, especially when outdoors without effective cooling and/or adequate hydration. .Wind...Breezy conditions (18-22 kts | 21-25 mph), particularly across the coastal locations. Unsecured items could blow around. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday An elevated excessive heat threat will continue through at least early next week across most urban coastal locations. Breezy conditions and a moderate risk of rip currents will prevail through the workweek. A dense Saharan Air Layer will return on Thursday and Friday, promoting hazy skies and reduced visibilities. .SPOTTER INFORMATION STATEMENT... Spotter activation is encouraged. Please relay any information about flooding, winds, waves, and rip currents to the National Weather Service in San Juan. $$