Understanding Floods

Urban and Small Stream Flood Advisory

            Carolina, PR

Flash Flood Warning

            Utuado, PR

Flash Flood Emergency

                         Comerio, PR

Flash Flood Watch

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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)

Lake Levels

Click here to obtain lake levels

Flood Threat

**En Español**                                                      

000
FLCA42 TJSJ 200910
HWOSJU

Hazardous Weather Outlook
National Weather Service San Juan PR
510 AM AST Fri Sep 20 2019

AMZ710>745-PRZ001>013-210915-
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-
510 AM AST Fri Sep 20 2019

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

.Day One...Today and Tonight

.Thunderstorms...There is a chance of thunderstorms with heavy
rainfall and brief gusty winds this afternoon across portions of
northwestern Puerto Rico.

.Flooding...Heavy rains could lead to urban and small stream
flooding. There is also the possibility of coastal flooding across the north
coast of Puerto Rico due to a northerly swell causing large breaking
waves.

.Waves...Choppy/Rough seas up to 10 feet expected across most of the
local waters. Large breaking waves of 10 to 15 feet are expected
today across the north shore of Puerto Rico.

.Rip Currents...There is a high risk of rip currents for beaches along
the west, north and northeast coast of Puerto Rico. In addition, high
risk for most of the beaches in Culebra as well as northern Vieques.
Moderate risk of rip currents for southern Vieques and culebra and
the some of the western beaches of Puerto Rico.

.Heat...Daytime high temperatures today will be in the low to mid 90s
across the lower elevations of Puerto Rico, and the heat index values
will be between 100 and 105 degrees.

.Days Two through Seven...Saturday through Thursday

Hazardous marine conditions will continue through the weekend as the
swell associated with Hurricane Jerry invades the local area. The
high risk of rip currents is also expected for the next several days.
Showers and thunderstorms are expected through the upcoming weekend,
which could cause urban and small stream flooding.

.Spotter information statement...

Widespread spotter activation is not anticipated, however individual
spotter are encouraged to report flooding to the National Weather
Service in San Juan.

$$

AMZ715-725-VIZ001-002-210915-
St. Thomas St. John adjacent Islands-St Croix-
Nearshore Atlantic and adjacent Caribbean Coastal Waters-
510 AM AST Fri Sep 20 2019

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

.Day One...Today and Tonight

.Waves...Choppy/Rough seas up to 10 feet expected across most of the
local waters. Large breaking waves up to 10 feet are expected today
across the north shore of Saint Thomas.

.Rip Currents...There is a high risk of rip currents for north and
west Saint Thomas as well as northwest Saint Croix. moderate risk for
the rest of Saint Thomas, most of Saint John and all other beaches of
Saint Croix except the south coast.

.Heat...Daytime high temperatures today will be in the low 90s across
the lower elevations of the U.S. Virgin Islands, and the heat index
values will be between 100 and 105 degrees.

.Days Two through Seven...Saturday through Thursday

Hazardous marine conditions will continue through the weekend as the
swell associated with Hurricane Jerry invades the local area. The
high risk of rip currents is also expected for the next several days.
Showers and thunderstorms are expected through the upcoming weekend,
which could cause urban and small stream flooding.

.Spotter information statement...

Widespread spotter activation is not anticipated, however individual
spotter are encouraged to report Rip Currents to the National Weather
Service in San Juan.

$$

Climate and Hydro Reports

• River and Flood Conditions

• Flood Crest Information

• Climate Reports

Rainfall 

• Average Rainfall Maps

• Current and archived rainfall analysis

Climate and Drought

• Climate and drought information

Past Flood Events

• Heavy Rain and Flooding in USVI, Nov-Dec 2013

• Record Rainfall and Flooding in San Juan Metro, July 2013

• Extended Period of Heavy Rain and Flooding May 12-Jun 16, 2011

• Flood Event of July 20-23, 2010

• Aibonito Flood Event of Dec 24-25, 2009

• Pre-Kyle Flood Event of Sep 20-23, 2008

• Hurricane Hortense–September 9-10, 1996

• Three Kings Flash Floods–January 5-6, 1992

• Floods of October 6–7, 1985 and Mameyes Landslide

• Floods of October 5–10, 1970

• Floods of September 6, 1960

• St. Thomas and St. John, U.S. Virgin Islands Flood of April 18, 1983

• Flood of November 10, 2010 in St. Croix

Local Archives

• Archives