National Weather Service United States Department of Commerce

Cold Front to Bring Cooling and Heavy Rain in the East; Building Heat and Monsoon in the West

A slow moving cold front will bring temperatures back to near normal early this week in the East. Strong to severe storms ahead of the front may produce damaging winds and heavy rain that could cause flash flooding. Strengthening high pressure in the West will produce surging monsoon moisture with potential for flash flooding. Heat may become excessive in the Desert Southwest this week. Read More >

Hydrology and River Information


Understanding Floods

Urban and Small Stream Flood Advisory

 

            Carolina, PR

Urban and Small Stream Advisory

Inundaciones Urbanas y de Pequeños Riachuelos

What is it? Flooding of small streams, streets and low lying areas.

What to do? Stay away from areas that are prone to flooding.  Stay clear of rapidly moving water.

¿Qué es? Inundaciones de quebradas, calles y áreas bajas.

¿Qué hacer? Mantenerse lejos de áreas propensas a inundaciones.  Manténgase lejos de agua en movimiento.

 

Flash Flood Warning

            Utuado, PR

Flash Flood Warning

Avisos de Inundaciones Repentinas

What is it? Flood impacts are occurring or imminent.

What to do? Stay alert for inundated roadways and follow instructions from authorities. Additional impacts include structures that could become flooded and need to be evacuated.

¿Qué es? Inundaciones están ocurriendo o son inminentes.

¿Qué hacer? Manténgase informado sobre carreteras inundadas y siga las instrucciones de las autoridades. Impactos adicionales incluyen estructuras que podrían inundarse y podrían ser evacuadas.

 

Flash Flood Emergency

                         Comerio, PR

Flash Flood Emergency

Emergencia de Inundaciones Repentinas

What is it? Flash flood situations that represent extreme danger.

What to do? Immediately reach higher ground by any means possible.

¿Qué es? Inundaciones repentinas que representan extremo peligro.

¿Qué hacer? Muévase a terreno alto inmediatamente.

 

Flash Flood Watch

Flash Flood Watch

Vigilancia Inundaciones Repentinas

What is it? Flooding is possible – typically within 6 to 48 hours.

What to do? Stay informed and prepare for water rises along rivers that could affect nearby roads and buildings.

¿Qué es? Inundaciones son posibles típicamente dentro de 6 a 48 horas.

¿Qué hacer? Mantenerse informado y prepararse para aumento de niveles de ríos, que pudieran alcanzar carreteras y estructuras.

 


***Image generation could take a few minutes***

***Gray images are not complete***

Observed Rainfall

1-day rainfall 7-day rainfall 14-day rainfall

 

Departure from Normal Rainfall

7-day rainfall deficit 30-day rainfall deficit 60-day rainfall deficit

 

Advanced Hydrologic Prediction Services (AHPS)


Rainfall Forecast

24 hr Rainfall Forecast Total Today

 

24 hr Rainfall Forecast Total Tomorrow

Soil Saturation

Latest Volumetric Soil Moisture Image

 

Latest Soil Saturation

 

Puerto Rico Agricultural Water Management


Streamflows Statistics

Today 7- Day Average

 

14- Day Average  28- Day Average

 

United States Geological Survey (USGS) Water Watch


Flood Conditions

Water Data by Puerto Rico River Basin Grouping

Río Cibuco-Guajataca Basin

Rio Cibuco Rio Manati near Ciales Rio Manati near Manati
 
Rio Grande Arecibo blw Utuado Lago Dos Bocas Rio Grande Arecibo abv Arecibo

 

Río Patillas-Loco Basin

Rio Coamo Rio Cerrillos Rio Portugues

 

Río Guanajibo-Culebrinas Basin

Rio Grande de Añasco Rio Culebrinas near Moca Rio Culebrinas Aguada
 
Rio Rosario Rio Guanajibo

 

Río de la Plata-Maunabo Basin

Rio de La Plata nr Toa Alta Rio de la Plata blw La Plata Dam Rio de La Plata Aibonito
 
Rio Grande de Loiza at Aibonito Rio Grande de Loiza at Caguas Lago Loiza nr Trujillo Alto
 
Rio Piedras at Hato Rey Rio Gurabo

 

Advanced Hydrologic Prediction Services (AHPS)


Flood Threat

 

**En Español**                                                      


000
FLCA42 TJSJ 221201 CCA
HWOSJU

Hazardous Weather Outlook...CORRECTED
National Weather Service San Juan PR
801 AM AST Mon Jul 22 2019

AMZ710>745-PRZ001>013-230900-
San Juan and Vicinity-Northeast-Southeast-Eastern Interior-
North Central-Central Interior-Ponce and Vicinity-Nortwest-
Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques-
The nearshore and off shore Atlantic and Caribbean Coastal Waters-
801 AM AST Mon Jul 22 2019

This Hazardous Weather Outlook is for Puerto Rico and the adjacent
Atlantic Coastal Waters.

.Day One...Today and Tonight

.Thunderstorms...There is a good chance of thunderstorms with heavy
rainfall and brief gusty winds this afternoon across portions of
western and interior Puerto Rico and some adjacent local waters.
Showers and isolated thunderstorms in the San Juan Metro Area cant
be ruled out.

.Flooding...Heavy rains will lead to areas of urban and small stream
flooding. Some rises on mainstem rivers are possible.

.Wind...Sustained winds in excess of 20 MPH/ 17 knots are expected
over the local Atlantic and Caribbean waters and in the Anegada
Passage.

.Waves...Choppy/Rough seas up to 5 feet are expected across all but
the protected waters near western Puerto Rico.

.Rip Currents...A moderate risk of rip currents will be
scattered around the northern and southern coasts of Puerto Rico, the
southeastern half of Vieques and the eastern third of Culebra.

.Heat...High humidity and normal summertime temperatures will create
heat indices of 102-106 degrees Fahrenheit in the lowest elevations
of Puerto Rico.

.Days Two through Seven...Tuesday through Sunday

The risk of thunderstorms will continue each afternoon in western and
interior Puerto Rico. A moderate risk of rip currents will be
scattered around the northern and southern coasts of Puerto Rico each
day--with coverage increasing during the week. Heat indices will
exceed 102 degrees in some lower elevations each day. Winds will
exceed 20 mph/17 kt in some exposed waters and locally along the
north and south coasts.


.Spotter information statement...

Widespread spotter activation is not anticipated, however individual
spotter are encouraged to report high winds, hail, flooding,
waterspouts or rip currents to the National Weather Service in San
Juan.

$$

AMZ715-725-VIZ001-002-230900-
St. Thomas St. John adjacent Islands-St Croix-
Nearshore Atlantic and adjacent Caribbean Coastal Waters-
801 AM AST Mon Jul 22 2019

This Hazardous Weather Outlook is for the U.S. Virgin Islands and the
adjacent Coastal Waters.

.Day One...Today and Tonight

.Wind...Sustained winds in excess of 20 MPH/ 17 knots are expected
over the local waters and the Anegada Passage tonight.

.Rip Currents...There is a moderate risk of rip currents for
all of Saint Croix except the western coast.

.Heat...High humidity and normal summertime temperatures will create
heat indices that exceed 102 degrees Fahrenheit in a few locations of
Saint Croix and Saint Thomas.

.Days Two through Seven...Tuesday through Sunday

The moderate risk of rip currents will continue for Saint Croix and by
Thursday all of the island`s coasts will be affected and Cramer Park
may have a high risk of rip currents. High humidities and normal
summertime temperatures will produce heat indices of 100-107 degrees
Fahrenheit in a few lower elevation locations-- more so on Thursday.
There is a slight chance of thunderstorms on Thursday and Friday.

.Spotter information statement...

Widespread spotter activation is not anticipated, however individual
spotter are encouraged to report high winds, flooding, waterspouts or
rip currents to the National Weather Service in San Juan.

$$