Sunrise 6:07 AM   Sunset 6:46 PM Moonrise 2:41 PM   Moonset 3:01 AM

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AMZ735 Coastal Waters Of Southern Puerto Rico Out 10 Nm- 959 Am Ast Thu Apr 18 2024
Rest of today - East winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.Tonight - Northeast winds 5 to 10 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Isolated showers.Friday - Northeast winds 5 to 10 knots, becoming east in the afternoon. Seas around 2 feet or less. Dominant period 7 seconds. Isolated showers.Friday night - Northeast winds 5 to 10 knots. Seas around 2 feet or less. Dominant period 7 seconds. Isolated showers.Saturday - Northeast winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 7 seconds. Scattered showers.Sunday - East winds 10 to 15 knots with gusts up to 25 knots. Seas 1 to 3 feet. Dominant period 6 seconds. Isolated showers.Monday - East winds 10 to 15 knots. Seas 1 to 3 feet. Dominant period 6 seconds. Isolated showers.

AMZ700 959 Am Ast Thu Apr 18 2024
Synopsis for puerto rico and the uS. Virgin islands waters - . A set of surface troughs, one to the northwest and other to the northeast of the islands will promote light to locally moderate northeast winds today. A small northeasterly swell will move across the atlantic waters from today onward. The surface trough northeast of the region and a surface high pressure building across the western atlantic will promote moderate to locally fresh trades by the weekend.

FXCA62 TJSJ 180910 AFDSJU

Area Forecast Discussion National Weather Service San Juan PR 510 AM AST Thu Apr 18 2024

SYNOPSIS

Trofiness aloft will persist through next week; thus, afternoon convection due to local effects may result in thunderstorms across the interior and western sections. Any persistent moderate to locally heavy rain over the already saturated soils may result in river flooding or sudden mudslides along steep terrains this afternoon. A surface high-pressure migrating from the western Atlantic to the Central Atlantic from this weekend into next will promote an advective pattern from Sunday onward.

SHORT TERM
Today through Saturday...

Showers developed over Puerto Rico and the USVI throughout the early morning hours, with up to half an inch near Trujillo Alto and less elsewhere. Winds lightened and became variable with speeds around 3 mph at 4am this morning. Heavy rainfall yesterday caused Rio Grande de Manati and Rio Cibuco at Vega Baja to overflow their banks, causing flooding on the roads they intersect. Due to this Flood Warnings were issued until the morning.

As the mid to upper-level and associated surface trough continue to pass through region unstable conditions will persist. By this morning, the surface trough has already moved past the USVI and due to it's positioning the surface winds will prevail from the NE today with light to moderate speeds, with stronger gust during the afternoon. By this afternoon the area will be under the stable side of the upper-level trough, however diurnal heating, local effects and lingering moist air will allow convection to bring heavy rainfall mainly across the interior to western sections of Puerto Rico. Due to previous days of heavy rainfall soils are already saturated which will increase the chance of runoff resulting in flash flooding and possible mudslides across areas with steep elevation.

By tonight, conditions will begin to improve overall with the exiting of the upper-level trough and the mixing of drier air into the region as northerly winds prevail. A surface high begins to build in the western Atlantic, causing wind speeds to increase from the NE to N. Besides ongoing passing showers throughout the morning for northern and eastern PR and the USVI, Friday afternoon still holds a good chance to bring noticeable rainfall for southwestern to interior sections of Puerto Rico. A similar pattern will prevail on Saturday with southwestern Puerto Rico having the best chance of heavier rain. Temperatures are expected to be slightly cooler for northern coastal areas these days due to northerly wind. Again, for these days, flooding of small streams and urban areas remains totally possible with the heaviest activity mainly across the interior to western sections of PR during the afternoon hours.


LONG TERM
Sunday through Thursday...

A surface high-pressure building north of the islands, promoting an advective pattern, will bring occasional moisture surges across the USVI and PR from Sunday onward. The winds will persist mainly from the east to east-northeast, which may result in the areas affected by passing showers being the islands' north and east windward sections, especially during the night and morning hours.
These showers will bring periods of moderate to locally heavy rains at times. The afternoon convection will be driven mainly by local effects, diurnal heating, and sea breeze variations across the interior and western sections daily. Additionally, the latest model guidance suggests maximum temperatures near the normal climatological values during the long term.

Around mid-week, an upper-level trough will approach from the west, increasing the local instability, which, combined with the sea breeze, orographic effects and diurnal heating could result in the typical strong afternoon convection of a wet April.

AVIATION
(06z)

VCSH are expected to continue across the local area through at least tonight. Periods of reduced VIS and low CIGs are possible during the afternoon with thunderstorm development. Winds are light and variable this morning and then will become NE at 10-15 kts aft 18/14z, with stronger gusts.

MARINE
A set of surface troughs, one to the northwest and other to the northeast of the islands will promote light to locally moderate northeast winds today. A small northeasterly swell will move across the Atlantic water from today onward. The surface trough northeast of the region and a surface high pressure building across the western Atlantic will promote moderate to locally fresh trades by the weekend.

BEACH FORECAST
A northeasterly swell, spreading across the local Atlantic, and the locally wind-seas will result in a moderate risk of rip currents along the north and east facing beaches in PR and the USVI. The northeasterly swell will continue throughout the weekend.

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

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Thu -- 03:00 AM AST     Moonset
Thu -- 06:07 AM AST     Sunrise
Thu -- 07:00 AM AST     0.72 feet High Tide
Thu -- 09:15 AM AST     0.54 feet Low Tide
Thu -- 02:40 PM AST     Moonrise
Thu -- 05:28 PM AST     0.70 feet High Tide
Thu -- 06:44 PM AST     Sunset
Thu -- 09:02 PM AST     0.25 feet Low Tide
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Playa de Ponce, Puerto Rico, Tide feet

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