Hazardous Weather Outlook
Issued by NWS San Juan, PR

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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.

$$