Info HWO Hazardous Weather Outlook — Fri May 30, 2025 3:33 PM

HWOSJU) and it`s graphical format
(weather.gov/erh/ghwo?wfo=sju) for more information.


.LONG TERM...Monday through Friday...
./FROM PREV DISCUSSION...Issued at 350 AM AST Fri May 30 2025/

The forecast continues on track with the entrance of a dense plume
of Saharan Air Layer (SAL) affecting the northeastern Caribbean
through mid-week. Based on the latest model guidance the higher
concentrations of dust are expected to peak on Monday with aerosol
optical thickness of near 0.5. Hazy skies, deteriorated air quality
and reduced visibilities will continue through late Wednesday.
Despite the higher concentrations are expected by early in the week,
low to moderate concetrations of dust will continue through next
weekend. Residents and visitors are urged to take the necessary
health precautions during this period. At the surface, a high
pressure system will promote southeasterly winds through Tuesday.
The, winds are expected to shift from the east as the surface high
moves towards the northeast Atlantic. A mid-to-upper level ridge
will build over the northeastern Caribbean by Monday, promoting
drier conditions and stability aloft. Under these conditions, very
limited shower activity is anticipated throughout the period with
precipitable water values (PWAT) near below-normal climatological
values (1.5 inches). However, showers and isolated thunderstorms
are possible over western Puerto Rico with the combination of
diurnal heating and local effects. Warm to hot temperatures are
expected too, with temperatures rising to above normal values for
early next week. Highs are expected to be in the upper 80s to low
90s in the coastal and urban areas, and in the low 80s in the
higher elevations. Heat indices could reach values over 108
degrees Fahrenheit on Monday and Tuesday, particularly over north-
central Puerto Rico. Please be aware of these conditions if
planning to do activities outdoors, school summer camps or
construction.

&&

.AVIATION...

(18Z TAFS)

Mainly VFR conditions across the terminals. Any SHRA will move
quickly, without significant impacts to operations for most
terminals. Winds from the ESE at 15-20 kts, with higher gusts,
before decreasing after 22Z and increasing again after 31/13Z.
VCSH will develop near TJBQ during the afternoon hours. High
clouds will can cause BKN060-80 skies through the period. HZ is
forecast by tomorrow evening.

&&

.MARINE...

A surface high pressure building over the Atlantic Basin will
continue to promote moderate to locally fresh trade winds over the
next few days. Small craft should exercise caution across most
offshore waters and local Caribbean passages. Isolated
thunderstorms are expected to affect the western coastal waters of
Puerto Rico and the Mona Passage each afternoon and evening. Low
concentrations of Saharan Dust will remain over the region through
Saturday, then hazy skies and reduced visibilities are expected
from late Saturday through mid-week as another dense plume of
Saharan dust moves toward the area.

&&

.BEACH FORECAST...

There is a low to moderate risk of rip currents tonight for
northern beaches of Puerto Rico, with a moderate risk for St.
Croix. The rest of the area, remains under a low risk of rip
currents. Although the rest of the region is under a low risk of
rip currents, these life- threatening rip currents often occur in
the vicinity of groins, jetties, reefs, and piers. A low to
moderate risk of rip currents is forecast for southern beaches of
Puerto Rico, Vieques, Culebra and St. Croix during the weekend.

&&

.SJU WATCHES/WARNINGS/ADVISORIES...
PR...None.
VI...None.
AM...None.
&&

$$