Marine Weather Net

Southern US Virgin Islands, Vieques and Eastern Puerto Rico out 10nm Marine Forecast


REST OF TODAY

SW
WINDS
5 - 10
KNOTS

TONIGHT

W
WINDS
5 - 10
KNOTS

THURSDAY

W
WINDS
5 - 10
KNOTS

THURSDAY NIGHT

N
WINDS
10 - 15
KNOTS

The Marine Weather Forecast In Detail:
AMZ725 Forecast Issued: 929 AM AST Wed Mar 08 2023

Rest Of Today...Southwest Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 11 Seconds. Isolated Showers.
Tonight...West Winds 5 To 10 Knots. Seas 1 To 3 Feet. Dominant Period 10 Seconds. Isolated Showers.
Thursday...West Winds 5 To 10 Knots. Seas 2 To 4 Feet With Occasional Seas Around 5 Feet. Dominant Period 10 Seconds. Numerous Showers.
Thursday Night...North Winds 10 To 15 Knots. Seas 4 To 6 Feet With Occasional Seas Up To 8 Feet. Dominant Period 11 Seconds. Scattered Showers.
Friday...North Winds 10 To 15 Knots With Gusts Up To 25 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 11 Seconds. Isolated Showers.
Saturday...Southeast Winds 5 To 10 Knots. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 12 Seconds. Isolated Showers.
Sunday...South Winds 5 To 10 Knots, Becoming East. Seas 3 To 5 Feet With Occasional Seas Up To 6 Feet. Dominant Period 12 Seconds.
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Area Forecast Discussion
National Weather Service San Juan PR
449pm AST Monday Jun 24 2024

Synopsis
A dense plume of Saharan dust is expected to arrive on Tuesday morning along with a very dry airmass. These conditions will promote hazy skies and hot temperatures from Tuesday through Thursday. Significant rainfall activity is not anticipated due to the presence of the dust particles.

.SHORT TERM...Tonight through Wednesday... Bands of showers and thunderstorms associated to a passing tropical wave affected Puerto Rico and the USVI during the day. The strongest activity was observed during the afternoon hours across the northwestern municipalities of Puerto Rico, and the San Juan metro area. Doppler radar estimated between 1.0 to 2.5 inches of rain across the mentioned sectors. It was very hot today too, with maximum temperatures reaching the lower 90s across the lower elevations. Heat indices were seen between 105 to 110 degrees Fahrenheit along the coastal and urban areas.

The tropical wave is forecast to exit the local area by this evening. Then, a drier airmass with a dense Saharan Air Layer will arrive and persist through at least Thursday. Moderate to severe concentrations of Saharan Dust will result in hazy skies and lower visibilities across Puerto Rico and the USVI.

Hot temperatures are anticipated for Tuesday through Wednesday. Maximum temperatures could reach the mid 90s across the coastal and urban sectors.
Excessive Heat Warning...d Heat Advisories are anticipated. A Heat Watch will be in effect starting on TUesday morning for Puerto Rico and the USVI. Afternoon convection will remain possible for northwestern Puerto Rico, but conditions aloft and the presence of Saharan Dust will not favor widespread rainfall activity.

Long Term
Thursday through Monday... ./FROMIssued at 439am AST Monday Jun 24 2024/

Through early in the weekend, there will be a mid-to upper-level ridge across the northeastern Caribbean. Its still possible that afternoon showers will form across the western sections of Puerto Rico. Instability will slightly increase from late Thursday and Friday as an induced low-level trade wind perturbation streams across the local area raising moisture content that will increase the chance of isolated thunderstorms and showers.

A trade wind pattern due to an established surface high across the Atlantic basin will drag tropical moisture into the islands through the weekend into next week. According to global model guidance, PWAT (Precipitable Water) values will fluctuate from 1.70 to 2.10 inches, just above seasonal climatological values for the region. That moisture, along with diurnal heating, will promote the development of afternoon showers and isolated thunderstorms each day across the western interior sections of Puerto Rico. The arrival of drier air on Monday may reduce the chance of showers, however do still expect a typical seasonal pattern of passing showers and afternoon convection for the start of the following week.

Marine
A surface high pressure over the central Atlantic will promote light to moderate southeasterly winds. Trade wind showers will move across the regional waters from time to time. Increasing winds and showers with thunderstorms are expected through tonight across the local waters. Hazy skies are expected from Tuesday through Thursday due to Saharan dust.

Beach Forecast

There is a low to moderate risk of rip currents across PR and the U.S. Virgin Islands.

.SJU WATCHES/WARNINGS/ADVISORIES... PR...Excessive Heat Watch from Tuesday morning through Tuesday afternoon for PRZ001>003-005-007-008-010-011.

VI...Excessive Heat Watch from Tuesday morning through Tuesday afternoon for VIZ001-002.

AM...None.