Marine Weather and Tide Forecast for Las Marķas, PR
May 21, 2024 8:26 PM AST (00:26 UTC) Change Location
 | Sunrise 5:52 AM Sunset 6:58 PM Moonrise 5:27 PM Moonset 4:17 AM |
AMZ742 Coastal Waters Of Northwestern Puerto Rico Out 10 Nm- 403 Pm Ast Tue May 21 2024
Tonight - East winds around 5 knots, increasing to 5 to 10 knots late this evening and overnight. Seas around 2 feet. Wave detail: south 2 feet at 6 seconds and north 1 foot at 7 seconds. Scattered showers with isolated Thunderstorms early this evening, then isolated showers late this evening and early morning.
Wednesday - East winds 5 to 10 knots. Seas around 2 feet. Wave detail: southeast 2 feet at 6 seconds and north 1 foot at 7 seconds. Showers and scattered Thunderstorms in the afternoon.
Wednesday night - Northeast winds 10 to 15 knots, becoming east 15 to 20 knots after midnight. Seas 2 to 3 feet, occasionally to 4 feet. Wave detail: northeast 3 feet at 4 seconds and north 1 foot at 7 seconds. Scattered showers.
Thursday - East winds 10 to 15 knots with gusts up to 25 knots. Seas 2 to 3 feet, occasionally to 4 feet. Wave detail: northeast 3 feet at 6 seconds. Showers.
Thursday night - East winds 10 to 15 knots with gusts up to 20 knots, diminishing to 5 to 10 knots after midnight. Seas 2 to 3 feet, occasionally to 4 feet. Wave detail: southeast 3 feet at 6 seconds and north 1 foot at 7 seconds. Scattered showers.
Friday - Southeast winds 10 to 15 knots with gusts up to 20 knots. Seas 2 to 3 feet, occasionally to 4 feet. Wave detail: southeast 2 feet at 5 seconds and north 1 foot at 7 seconds. Scattered showers in the morning, then numerous showers and scattered Thunderstorms in the afternoon.
Friday night - East winds 5 to 10 knots. Seas around 2 feet. Numerous showers and scattered Thunderstorms.
Saturday - East winds 5 to 10 knots. Seas around 2 feet. Numerous showers and scattered Thunderstorms in the morning, then scattered showers in the afternoon.
Saturday night - East winds around 5 knots. Seas around 2 feet. Scattered showers.
Sunday - East winds around 5 knots. Seas around 2 feet. Scattered showers in the afternoon.
Sunday night - East winds 5 to 10 knots. Seas around 2 feet.
winds and seas higher in and near Thunderstorms.
winds and seas higher in and near Thunderstorms.
AMZ700 403 Pm Ast Tue May 21 2024
Synopsis for puerto rico and the uS. Virgin islands waters - . The interaction of an induced surface trough to the west and a weakening surface high pressure to the east will promote moderate east-southeast winds through midweek. As the surface trough moves closer to the region expect increasing shower and Thunderstorm activity across the local waters from Wednesday onward. This trough may increase winds across the Mona passage and atlantic waters late Wednesday night into Friday. Winds will slow down again by the weekend.
FXCA62 TJSJ 212040 AFDSJU
Area Forecast Discussion National Weather Service San Juan PR 440 PM AST Tue May 21 2024
SYNOPSIS
A wet and unstable weather pattern is expected to begin on Wednesday, as a trough in all levels approaches the Hispaniola from the south. This trough in combination with moisture from a trade wind perturbation will enhance the potential for heavy rains and thunderstorms through Friday. Therefore, the risk for urban and stream flooding is elevated.
SHORT TERM
Tonight through Thursday...
Mostly clear to partly cloudy skies were observed across the local islands. By mid-morning temperatures began to rise due to the combination of southeast winds and warm moist air. As a result above- normal temperatures were observed across the coastal and urban areas. The Luis Munoz Marin International Airport in San Juan weather station reported 95 degrees Fahrenheit, which ties the old record of 95 degrees in 2005. An Excessive Heat Warning was in effect for the northern, western and southwestern coast of Puerto Rico and St. Croix. A Heat Advisory was in effect elsewhere. In addition a maximum heat index of 116 degrees Fahrenheit was reported in Hatillo by a local emergency manager at around noon. Despite the warm and hot conditions, moderate to locally heavy showers were seen across the northwestern and north- central municipalities of Puerto Rico. Doppler radar estimated rainfall accumulations of 0.5 to 1.0 inches across the mentioned sectors.
The ongoing shower activity across western Puerto Rico is expected to end by sunset. Overall, tranquil weather conditions are anticipated during the overnight hours for all the local islands. By Wednesday onward, an approaching deep-layer trough aloft will increase instability across the local area. Sufficient moisture from a trade wind perturbation and tropical moisture pulled from northern South America with precipitable water content above 2.4 inches will enhance the rainfall activity across the region through the rest of the period. This event is expected to start by Wednesday afternoon and lasting through the end of the workweek. Squally weather conditions and thunderstorms are anticipated during this period.
Therefore, a Hydrologic Outlook (ESFSJU) was issued for Wednesday through Friday for Puerto Rico and the Virgin Islands due to an increased risk of flooding.
LONG TERM
Friday through Tuesday...
PREV DISCUSSION.../issued 416 AM AST Mon May 20 2024/
An unsettled weather environment is expected to persist on Friday, with a surface low now centered north of Hispaniola, and still under the influence of a mid to upper level trough. The low will drive the winds from the south at the surface, and from the southwest a little bit above that. Pulses of clouds, showers and thunderstorms are expected to move from the Caribbean Sea into portions of Puerto Rico and the U.S. Virgin Islands. The Galvez-Davison Index indicate the potential for scattered thunderstorms and heavy rain at times. It is possible that these thunderstorms will bring gusty winds at times.
On Saturday, the islands will be in between a moist channel near the Mona Passage, and a mid level high pressure centered just to the east of the Leeward Islands. This high will push some drier air closer to the Virgin Islands, possibly with some Saharan dust.
Nevertheless, sunshine will begin to peek across the region, and with all the available moisture, convection will fire up in the afternoon, favoring portions of eastern and northeastern Puerto Rico, then moving into the waters of Vieques, Culebra and the Virgin Islands. With enough sunshine, heat indices will creep again above 100 F.
The pattern becomes more seasonal on Sunday and early in the workweek. The trough will gradually lose influence in the region, while a mid to upper ridge gets established across the northeastern Caribbean. The pressure gradient will remain weak on Sunday, with a low level steering flow out of the southeast on Sunday, at around 6- 9 kts, and recovering speeds on Monday and Tuesday, generally from the east at 10 to 12 knots. Each of these days, enough sunshine will trigger afternoon convection, with the potential for heavy showers and isolated thunderstorms across the interior, northwestern and north-central Puerto Rico. Passing showers will move across the Virgin Islands and eastern Puerto Rico at times too.
In summary, the main risk on Friday and Saturday will be flooding and mudslides, as well as rapid river rises in areas that receive heavy rain. Then, for Sunday and early next week, the flooding threat will be limited for the northwestern quadrant of Puerto Rico.
It will become hot too, as heat indices go above 102 degrees each afternoon.
AVIATION
(18Z TAFS)
Mainly VFR conditions expected to prevail. TSRA will develop across the interior, N and NW PR thru 21/23z. This activity may impact TJBQ, where TS are possible to bring periods of reduced VIS and low ceilings. Winds will blow from SE at 8-15 kts, with stronger wind gusts and sea breezes variations. Unsettled weather conditions will develop tomorrow, especially aft 22/16z, affecting the local flying area.
MARINE
The interaction of an induced surface trough to the west and a weakening surface high pressure to the east will promote moderate east-southeast winds through midweek. As the surface trough moves closer to the region expect increasing shower and thunderstorm activity across the local waters from Wednesday onward. This trough may increase winds across the Mona Passage and Atlantic waters late Wednesday night into Friday. Winds will slow down again by the weekend.
BEACH FORECAST
Increasing winds across southwestern Puerto Rico and near St.
Croix will make the rip current risk to reach moderate for St.
Croix by late tonight into Wednesday. Elsewhere, a low rip current risk will continue.
SJU WATCHES/WARNINGS/ADVISORIES
PR...Excessive Heat Warning until 6 PM AST this evening for PRZ001- 005-008-010-011.
Heat Advisory until 6 PM AST this evening for PRZ002-003-012-013.
VI...Excessive Heat Warning until 6 PM AST this evening for VIZ002.
Heat Advisory until 6 PM AST this evening for VIZ001.
AM...None.
Area Forecast Discussion National Weather Service San Juan PR 440 PM AST Tue May 21 2024
SYNOPSIS
A wet and unstable weather pattern is expected to begin on Wednesday, as a trough in all levels approaches the Hispaniola from the south. This trough in combination with moisture from a trade wind perturbation will enhance the potential for heavy rains and thunderstorms through Friday. Therefore, the risk for urban and stream flooding is elevated.
SHORT TERM
Tonight through Thursday...
Mostly clear to partly cloudy skies were observed across the local islands. By mid-morning temperatures began to rise due to the combination of southeast winds and warm moist air. As a result above- normal temperatures were observed across the coastal and urban areas. The Luis Munoz Marin International Airport in San Juan weather station reported 95 degrees Fahrenheit, which ties the old record of 95 degrees in 2005. An Excessive Heat Warning was in effect for the northern, western and southwestern coast of Puerto Rico and St. Croix. A Heat Advisory was in effect elsewhere. In addition a maximum heat index of 116 degrees Fahrenheit was reported in Hatillo by a local emergency manager at around noon. Despite the warm and hot conditions, moderate to locally heavy showers were seen across the northwestern and north- central municipalities of Puerto Rico. Doppler radar estimated rainfall accumulations of 0.5 to 1.0 inches across the mentioned sectors.
The ongoing shower activity across western Puerto Rico is expected to end by sunset. Overall, tranquil weather conditions are anticipated during the overnight hours for all the local islands. By Wednesday onward, an approaching deep-layer trough aloft will increase instability across the local area. Sufficient moisture from a trade wind perturbation and tropical moisture pulled from northern South America with precipitable water content above 2.4 inches will enhance the rainfall activity across the region through the rest of the period. This event is expected to start by Wednesday afternoon and lasting through the end of the workweek. Squally weather conditions and thunderstorms are anticipated during this period.
Therefore, a Hydrologic Outlook (ESFSJU) was issued for Wednesday through Friday for Puerto Rico and the Virgin Islands due to an increased risk of flooding.
LONG TERM
Friday through Tuesday...
PREV DISCUSSION.../issued 416 AM AST Mon May 20 2024/
An unsettled weather environment is expected to persist on Friday, with a surface low now centered north of Hispaniola, and still under the influence of a mid to upper level trough. The low will drive the winds from the south at the surface, and from the southwest a little bit above that. Pulses of clouds, showers and thunderstorms are expected to move from the Caribbean Sea into portions of Puerto Rico and the U.S. Virgin Islands. The Galvez-Davison Index indicate the potential for scattered thunderstorms and heavy rain at times. It is possible that these thunderstorms will bring gusty winds at times.
On Saturday, the islands will be in between a moist channel near the Mona Passage, and a mid level high pressure centered just to the east of the Leeward Islands. This high will push some drier air closer to the Virgin Islands, possibly with some Saharan dust.
Nevertheless, sunshine will begin to peek across the region, and with all the available moisture, convection will fire up in the afternoon, favoring portions of eastern and northeastern Puerto Rico, then moving into the waters of Vieques, Culebra and the Virgin Islands. With enough sunshine, heat indices will creep again above 100 F.
The pattern becomes more seasonal on Sunday and early in the workweek. The trough will gradually lose influence in the region, while a mid to upper ridge gets established across the northeastern Caribbean. The pressure gradient will remain weak on Sunday, with a low level steering flow out of the southeast on Sunday, at around 6- 9 kts, and recovering speeds on Monday and Tuesday, generally from the east at 10 to 12 knots. Each of these days, enough sunshine will trigger afternoon convection, with the potential for heavy showers and isolated thunderstorms across the interior, northwestern and north-central Puerto Rico. Passing showers will move across the Virgin Islands and eastern Puerto Rico at times too.
In summary, the main risk on Friday and Saturday will be flooding and mudslides, as well as rapid river rises in areas that receive heavy rain. Then, for Sunday and early next week, the flooding threat will be limited for the northwestern quadrant of Puerto Rico.
It will become hot too, as heat indices go above 102 degrees each afternoon.
AVIATION
(18Z TAFS)
Mainly VFR conditions expected to prevail. TSRA will develop across the interior, N and NW PR thru 21/23z. This activity may impact TJBQ, where TS are possible to bring periods of reduced VIS and low ceilings. Winds will blow from SE at 8-15 kts, with stronger wind gusts and sea breezes variations. Unsettled weather conditions will develop tomorrow, especially aft 22/16z, affecting the local flying area.
MARINE
The interaction of an induced surface trough to the west and a weakening surface high pressure to the east will promote moderate east-southeast winds through midweek. As the surface trough moves closer to the region expect increasing shower and thunderstorm activity across the local waters from Wednesday onward. This trough may increase winds across the Mona Passage and Atlantic waters late Wednesday night into Friday. Winds will slow down again by the weekend.
BEACH FORECAST
Increasing winds across southwestern Puerto Rico and near St.
Croix will make the rip current risk to reach moderate for St.
Croix by late tonight into Wednesday. Elsewhere, a low rip current risk will continue.
SJU WATCHES/WARNINGS/ADVISORIES
PR...Excessive Heat Warning until 6 PM AST this evening for PRZ001- 005-008-010-011.
Heat Advisory until 6 PM AST this evening for PRZ002-003-012-013.
VI...Excessive Heat Warning until 6 PM AST this evening for VIZ002.
Heat Advisory until 6 PM AST this evening for VIZ001.
AM...None.
| Stations | Dist | Age | Wind | Air Temp | Water Temp | Waves | inHg | DewPt |
| MGZP4 - 9759394 - Mayaguez, PR | 8 mi | 68 min | NE 1.9G | 81°F | 87°F | 29.95 | ||
| MGIP4 - 9759110 - Magueyes Islands, PR | 17 mi | 68 min | ESE 2.9G | 85°F | 29.94 | |||
| 41115 - Rincon, Puerto Rico (181) | 18 mi | 90 min | 86°F | 2 ft | ||||
| 42085 - Southeast of Ponce, PR | 34 mi | 46 min | E 9.7G | 85°F | 29.92 |
toggle option: (graph/table)
| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Temp | DewPt | RH | inHg |
| TJBQ RAFAEL HERNANDEZ,PR | 20 sm | 36 min | calm | 7 sm | Overcast | Rain | 75°F | 72°F | 89% | 29.96 |
Mayaguez
Click for Map
Tue -- 01:51 AM AST 0.42 feet Low Tide
Tue -- 04:18 AM AST Moonset
Tue -- 05:53 AM AST Sunrise
Tue -- 06:14 AM AST 0.78 feet High Tide
Tue -- 12:34 PM AST -0.10 feet Low Tide
Tue -- 05:26 PM AST Moonrise
Tue -- 06:56 PM AST Sunset
Tue -- 07:46 PM AST 1.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:51 AM AST 0.42 feet Low Tide
Tue -- 04:18 AM AST Moonset
Tue -- 05:53 AM AST Sunrise
Tue -- 06:14 AM AST 0.78 feet High Tide
Tue -- 12:34 PM AST -0.10 feet Low Tide
Tue -- 05:26 PM AST Moonrise
Tue -- 06:56 PM AST Sunset
Tue -- 07:46 PM AST 1.58 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Mayaguez, Puerto Rico, Tide feet
| 12 am |
| 0.6 |
| 1 am |
| 0.5 |
| 2 am |
| 0.4 |
| 3 am |
| 0.5 |
| 4 am |
| 0.6 |
| 5 am |
| 0.7 |
| 6 am |
| 0.8 |
| 7 am |
| 0.8 |
| 8 am |
| 0.6 |
| 9 am |
| 0.5 |
| 10 am |
| 0.2 |
| 11 am |
| 0 |
| 12 pm |
| -0.1 |
| 1 pm |
| -0.1 |
| 2 pm |
| 0 |
| 3 pm |
| 0.3 |
| 4 pm |
| 0.7 |
| 5 pm |
| 1 |
| 6 pm |
| 1.3 |
| 7 pm |
| 1.5 |
| 8 pm |
| 1.6 |
| 9 pm |
| 1.5 |
| 10 pm |
| 1.3 |
| 11 pm |
| 1 |
Puerto Real
Click for Map
Tue -- 01:46 AM AST 0.31 feet Low Tide
Tue -- 04:18 AM AST Moonset
Tue -- 05:53 AM AST Sunrise
Tue -- 06:11 AM AST 0.57 feet High Tide
Tue -- 12:29 PM AST -0.07 feet Low Tide
Tue -- 05:26 PM AST Moonrise
Tue -- 06:56 PM AST Sunset
Tue -- 07:43 PM AST 1.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Click for Map
Tue -- 01:46 AM AST 0.31 feet Low Tide
Tue -- 04:18 AM AST Moonset
Tue -- 05:53 AM AST Sunrise
Tue -- 06:11 AM AST 0.57 feet High Tide
Tue -- 12:29 PM AST -0.07 feet Low Tide
Tue -- 05:26 PM AST Moonrise
Tue -- 06:56 PM AST Sunset
Tue -- 07:43 PM AST 1.15 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Puerto Real, Puerto Rico, Tide feet
| 12 am |
| 0.4 |
| 1 am |
| 0.3 |
| 2 am |
| 0.3 |
| 3 am |
| 0.4 |
| 4 am |
| 0.4 |
| 5 am |
| 0.5 |
| 6 am |
| 0.6 |
| 7 am |
| 0.5 |
| 8 am |
| 0.5 |
| 9 am |
| 0.3 |
| 10 am |
| 0.2 |
| 11 am |
| 0 |
| 12 pm |
| -0.1 |
| 1 pm |
| -0.1 |
| 2 pm |
| 0 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.5 |
| 5 pm |
| 0.8 |
| 6 pm |
| 1 |
| 7 pm |
| 1.1 |
| 8 pm |
| 1.1 |
| 9 pm |
| 1.1 |
| 10 pm |
| 0.9 |
| 11 pm |
| 0.7 |
Virgin,Islands/San,Juan/Cayey,PR
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