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Data Downloads
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You can find the data powering NWPS available for download here.
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All Data Downloads
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Observed and Forecast River gauge values (River Status Web Service)
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River gauges GIS Web Services |
River Gauges Service
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Partner Flood Inundation (FIM) Map
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Partner Flood Inundation (FIM) GIS Web Services |
Flood Inundation Map
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River Forecast Centers (RFC) Quantitative Precipitation Estimates (QPE)
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River Forecast Centers Quantitative Precipitation Estimates (QPE) GIS Web Services
The 13 National Weather Service (NWS) River Forecast Centers (RFC) produce Quantitative
Precipitation Estimates (QPE) for their individual RFC areas. The RFCs produce the data using a
multi-sensor approach utilizing NWS 88D radar estimates of precipitation, automated and manual
precipitation gauges and satellite estimates of precipitation. These QPEs are used as input into
their hydrologic models to produce NWS river forecasts and guidance products. The QPEs from each
RFC are combined into a single mosaic to create a QPE product that covers the lower 48 states,
Alaska and Puerto Rico. The data are on an approximate 4km x 4km grid cell scale.
The individual hourly data products (labeled Since 12Z Observed and those labeled Last X hours)
contain data for the labeled time frame. These products are updated every hour to incorporate the
most recent data.
The individual daily data products (Today’s Analysis Observed, those labeled Last X Days
Observed, and those labeled X To Date Observed.) represent a 24 hour total ending at 12 UTC on the
indicated date. These 24-hour data are then summed together to produce multi-day precipitation
totals. Normal precipitation data are also produced for the Today’s Analysis Observed and
multi-day summations of 7 days or greater using data from the PRISM Climate Group. Percent of
normal and departure from normal comparisons are also available by comparing the QPE data with the
PRISM normal data. The daily data may be updated several times between 12UTC and 21UTC each day as
updated data becomes available.
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RFC Quantitative Precipitation Estimates (QPE)
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| Watch Warning and Advisory (WWA) Data |
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Watch Warning and Advisory GIS Web Services
Watch
- A watch is used when the risk of a hazardous weather or hydrologic event has increased
significantly, but its occurrence, location, and/or timing is still uncertain. It is intended to
provide enough lead time so that those who need to set their plans in motion can do so.
Warning
- A warning is issued when a hazardous weather or hydrologic event is occurring, is imminent, or
has a very high probability of occurring. A warning is used for conditions posing a threat to life
or property.
Advisory
- The expected weather condition has a pretty good chance of occurring, even a likely chance of
occurring, but typically an advisory is used for less severe type of weather conditions. A Wind
Advisory might be issued or a Freezing Rain Advisory issued instead of a High Wind Warning or an
ice Storm Warning.
Questions/Concerns about the service, please contact the CloudGIS team (nws.mapservices@noaa.gov)
Note: This service is not time enabled
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NWS Watch and Warning(WWA) Advisory
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| Flood Hazard Outlook (FHO) |
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Flood Hazard Outlook GIS Web Service and Web Application
The Experimental Flood Hazard Outlook (FHO) is intended to provide a coordinated inland
hydrologic flood graphic for use in regional and national Impact-based Decision Support Services
(IDSS) briefings and support broad messaging of flood threat to NWS stakeholders and Federal
water partners. This experimental product combines a depiction of current flood conditions based
on the latest river observations with an assessment of flood risk for the next seven days,
leveraging various sources of NWS water resources forecast information. This experimental
product will be issued daily (21Z), but will increase to twice daily (1130Z & 21Z) during
tropical cyclone events.
The NWS is accepting comments through July 1, 2023 on the Experimental FHO as a replacement for
the current Significant River Flood Outlook product. Please provide feedback on the Experimental
FHO at:
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Flood Hazard Outlook (FHO) Web Service
Flood Hazard Outlook (FHO) Web Application
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| Area Hydrologic Discussion (AHD) |
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Area Hydrologic Discussion(AHD) Current Data
Area Hydrologic Discussion(AHD) Archive
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| National Hydrologic Discussion (NHD) |
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National Hydrologic Discussion (NHD) Current Data
National Hydrologic Discussion (NHD) Archive
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National Water Model (NWM) Streamflow Anomaly Analysis
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NWM Streamflow Anomaly Analysis GIS Web Services
Depicts seasonal streamflow anomalies derived from the analysis and assimilation configuration of
the National Water Model (NWM) over the contiguous U.S. Anomalies are based on 7-day and 14-day
moving average streamflow percentiles for each reach and the current calendar day.
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Streamflow Anomaly Analysis(ANA)
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National Water Model (NWM) High Flow Magnitude Analysis
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NWM High Flow Magnitude Analysis GIS Web Services
Depicts the magnitude of the National Water Model (NWM) streamflow forecast where the NWM is
signaling high water. This service is derived from the analysis and assimilation configuration of
the NWM over one of three spatial domains (see below). Shown are reaches with flow at or above high
water thresholds. Reaches are colored by the annual exceedance probability (AEP) of their current
flow
CONUS: High water thresholds (regionally varied) and AEPs were
derived using the 44-year NWM v3.0 reanalysis simulation.
Hawaii: High water thresholds and AEPs were derived from USGS
regression equations found at
https://pubs.usgs.gov/sir/2010/5035/sir2010-5035_text.pdf.
Puerto Rico / U.S. Virgin Islands: High water thresholds and AEPs
were derived from USGS regression equations found at
https://pubs.usgs.gov/wri/wri994142/pdf/wri99-4142.pdf.
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High Flow Magnitude Analysis
High Flow Magnitude Analysis - Hawaii
High Flow Magnitude Analysis - Puerto Rico/Virgin Islands
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National Water Model (NWM) Past 14-Day Max High Flow Magnitude Analysis
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(NWM) Past 14-Day Max High Flow Magnitude Analysis GIS Web Services
Depicts the magnitude of the peak NWM streamflow forecast over the past 14 days where the National
Water Model (NWM) is signaling high water. This service is derived from the analysis and
assimilation configuration of the NWM over the contiguous U.S. Shown are reaches with flow at or
above high water thresholds. Reaches are colored by the annual exceedance probability (AEP) of their
current flow. High water thresholds (regionally varied) and AEPs were derived using the 44-year NWM
v3.0 reanalysis simulation.
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Past 14 Day Max High Flow Magnitude Analysis
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National Water Model (NWM) 18 / 48-Hour High Water Arrival Time Forecast
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NWM 18 / 48-Hour High Water Arrival Time Forecast GIS Web Services
Depicts the forecast arrival time of high water over the next 18 hours (CONUS) or 48 hours (Hawaii /
PRVI). This service is derived from the short-range configuration of the National Water Model (NWM)
over one of three spatial domains (see below). Shown are reaches that are expected to have flow at
or above the high water threshold over the next 18 or 48 hours. Reaches are colored by the time at
which they are forecast to reach high water.
CONUS: High water thresholds (regionally varied) and AEPs were
derived using the 44-year NWM v3.0 reanalysis simulation.
Hawaii: High water thresholds and AEPs were derived from USGS
regression equations found at
https://pubs.usgs.gov/sir/2010/5035/sir2010-5035_text.pdf.
Puerto Rico / U.S. Virgin Islands: High water thresholds and AEPs
were derived from USGS regression equations found at
https://pubs.usgs.gov/wri/wri994142/pdf/wri99-4142.pdf.
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Short Range Forecast High Water Arrival Time
Short Range Forecast High Water Arrival Time -Hawaii
Short Range Forecast High Water Arrival Time Puerto Rico/Virgin Islands
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National Water Model (NWM) 18-Hour Rapid Onset Flooding Forecast
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NWM 18-Hour Rapid Onset Flooding Forecast GIS Web Services
Depicts forecast rapid onset flooding using the short-range configuration of the National Water
Model (NWM) over the contiguous U.S. Shown are reaches (stream order 4 and below) with a forecast
flow increase of 100% or greater within an hour, and which are expected to be at or above the high
water threshold within 6 hours of that increase. Also shown are USGS HUC10 polygons symbolized by
the percentage of NWM waterway length (within each HUC10) that is expected to meet the previously
mentioned criteria. High water thresholds (regionally varied) were derived using the 44-year NWM
v3.0 reanalysis simulation.
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Short Range Forecast Rapid Onset Flooding
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National Water Model (NWM) 12-Hour Rapid Onset Flooding Probability Forecast
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NWM 12-Hour Rapid Onset Flooding Probability Forecast GIS Web Services
Depicts the probability of forecast rapid onset flooding over the next 12 hours using a time-lagged
ensemble from the short-range configuration of the National Water Model (NWM) over the contiguous
U.S. Shown are reaches (stream order 4 and below) that are expected to meet rapid onset flooding
criteria (flow increase of 100% or greater within one hour and high water threshold conditions
within 6 hours) using the most recent 7 forecasts. Reaches are colored by the probability that they
will meet or exceed rapid onset conditions within hours 1-6, 7-12, and 1-12. Probabilities are
computed as the % agreement across the 7 ensemble members that a given reach will meet rapid onset
criteria at some point during the time period of interest. Hotspots show the average 1-12 hour rapid
onset flooding probability, weighted by reach length, for USGS HUC10 basins with greater than 10% of
NWM feature length meeting rapid onset criteria in the next 12 hours. High water thresholds
(regionally varied) were derived using the 44-year NWM v3.0 reanalysis simulation.
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Short Range Forecast Rapid Onset Flooding Probability
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National Water Model (NWM) 12-Hour Max High Water Probability Forecast
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NWM 12-Hour Max High Water Probability Forecast GIS Web Services
Depicts the probability of forecast high water over the next 12 hours using a time-lagged ensemble
from the short-range forecast of the National Water Model (NWM) over the contiguous U.S. Shown are
reaches that are forecast to have flow at or above high water within the next 12 hours of at least
one of the last 7 forecasts. Reaches are colored by the probability that they will meet or exceed
the high water threshold across the last 7 forecasts. Probabilities are derived by counting the
number of forecasts that meet the high water condition within the next 12 hours, equally weighted.
Also shown are USGS HUC10 polygons for basins with greater than 50% of NWM features with flow
expected to be at or above high water over the next 12 hours, symbolized by the average probability.
High water thresholds (regionally varied) were derived using the 44-year NWM v3.0 reanalysis
simulation.
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Short Range Forecast High Water Probability
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National Water Model (NWM) 18 / 48-Hour Max High Flow Magnitude Forecast
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NWM 18 / 48-Hour Max High Flow Magnitude Forecast GIS Web Services
Depicts the magnitude of the peak National Water Model (NWM) streamflow forecast over the next 18
hours (CONUS) or 48 hours (Hawaii / PRVI) where the NWM is signaling high water. This service is
derived from the short-range configuration of the NWM over one of three spatial domains (see below).
Shown are reaches with peak flow at or above high water thresholds. Reaches are colored by the
annual exceedance probability (AEP) of their forecast peak flow.
CONUS: High water thresholds (regionally varied) and AEPs were
derived using the 44-year NWM v3.0 reanalysis simulation.
Hawaii: High water thresholds and AEPs were derived from USGS
regression equations found at
https://pubs.usgs.gov/sir/2010/5035/sir2010-5035_text.pdf.
Puerto Rico / U.S. Virgin Islands: High water thresholds and AEPs
were derived from USGS regression equations found at
https://pubs.usgs.gov/wri/wri994142/pdf/wri99-4142.pdf.
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Short Range Forecast Max High Flow Magnitude
Short Range Forecast Max High Flow Magnitude Hawaii
Short Range Forecast Max High Flow Magnitude Puerto Rico/Virgin Islands
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National Water Model(NWM) GFS 10-Day High Water Arrival Time Forecast
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NWM GFS 10-Day High Water Arrival Time Forecast GIS Web Services
Depicts the forecast arrival time of high water over the next 10 days. This service is derived from
the GFS medium-range configuration of the National Water Model (NWM) over the contiguous U.S. Shown
are reaches that are expected to have flow at or above the high water threshold over the next 10
days. Reaches are colored by the time at which they are forecast to reach high water (calculated in
3 hour increments). High water thresholds (regionally varied) were derived using the 44-year NWM
v3.0 reanalysis simulation.
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Medium Range Forecast High Water Arrival Time
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National Water Model (NWM) GFS 5-Day High Water Probability Forecast
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NWM GFS 5-Day High Water Probability Forecast GIS Web Services
Depicts the probability of forecast high water over the next 5 days using ensembles from the
medium-range GFS configuration of the National Water Model (NWM) over the contiguous U.S. Shown are
reaches that are expected to have flow at or above high water on Day 1, Day 2, Day 3, and Days 4-5,
using the 6 time-lagged ensemble members of the medium-range forecast. Reaches are colored by the
probability that they will meet or exceed the high water threshold on Day 1, Day 2, Day 3, and Days
4-5. Probabilities are computed as the % agreement across the 6 time-lagged ensemble members,
equally weighted. Also shown are USGS HUC8 polygons for basins with greater than 50% of NWM features
with flow expected to be at or above high water over the next 5 days, symbolized by the average
probability. High water thresholds (regionally varied) were derived using the 44-year NWM v3.0
reanalysis simulation.
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Medium Range Forecast High Water Probability
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National Water Model (NWM) GFS 10-Day Max High Flow Magnitude Forecast
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NWM GFS 10-Day Max High Flow Magnitude Forecast
Depicts the magnitude of the peak National Water Model (NWM) streamflow forecast over the next 3, 5
and 10 days where the NWM is signaling high water. This service is derived from the medium-range GFS
configuration of the NWM over the contiguous U.S. Shown are reaches with peak flow at or above high
water thresholds. Reaches are colored by the annual exceedance probability (AEP) of their forecast
peak flow. High water thresholds (regionally varied) and AEPs were derived using the 44-year NWM
v3.0 reanalysis simulation.
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Medium Range Forecast Max High Flow Magnitude
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National Water Model (NWM) GFS 10-Day Rapid Onset Flooding Forecast
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NWM GFS 10-Day Rapid Onset Flooding Forecast GIS Web Services
Depicts forecast rapid onset flooding using the medium-range configuration of the National Water
Model (NWM) over the contiguous U.S. Shown are reaches (stream order 4 and below) with a forecast
flow increase of 100% or greater within 3 hours, and which are expected to be at or above the high
water threshold within 6 hours of that increase (all calculated in 3 hour increments). Also shown
are USGS HUC08 polygons symbolized by the percentage of NWM waterway length (within each HUC08) that
is expected to meet the previously mentioned criteria. High water thresholds (regionally varied)
were derived using the 44-year NWM v3.0 reanalysis simulation.
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Medium Range Forecast Rapid Onset Flooding
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National Water Model (NWM) GFS 5-Day Rapid Onset Flooding Probability Forecast
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NWM GFS 5-Day Rapid Onset Flooding Probability Forecast GIS Web Services
Depicts the probability of forecast rapid onset flooding over the next 5 days using ensembles from
the medium-range GFS configuration of the National Water Model (NWM) over the contiguous U.S. Shown
are reaches that are expected to have flow at or above high water thresholds on Day 1, Day 2, Day 3,
Days 4-5, and Days 1-5 using the 6 time-lagged ensemble members of the medium-range forecast.
Reaches are colored by the probability that they will meet or exceed rapid onset conditions on Day
1, Day 2, Day 3, Days 4-5, and Days 1-5. Probabilities are computed as the % agreement across the 6
time-lagged ensemble members, equally weighted. Hotspots show average 1-5 day rapid onset flooding
probability, weighted by reach length, for USGS HUC8 basins with greater than 10% of NWM feature
length meeting rapid onset criteria in the next 5 days. High water thresholds (regionally varied)
were derived using the 44-year NWM v3.0 reanalysis simulation.
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Medium Range Forecast Rapid Onset Flooding Probability
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National Water Model (NWM) Soil Moisture GIS Web Services
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NWM Soil Moisture GIS Web Services
Depicts estimated near surface soil moisture. This service is built by processing the analysis
assimilation output of the National Water Model land based data. All outputs of the land dataset
have the same geospatial extent covering all of CONUS with partial coverage into Canada and Mexico.
Currently, the only layer within the service is near-surface soil moisture saturation. The
near-surface soil moisture saturation layer shows moisture saturation of the top 40cm of the soil.
Model Output Version: v3.0
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Soil Moisture
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Data and Web Services Catalog