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Flood Inundation Mapping services are now available for 30% of the U.S.
population. Please visit https://www.weather.gov/owp/operations for more
information. Additional NWPS resources are available here.


NATIONAL WATER PREDICTION SERVICE


NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

 * Home

 * Water Operations
    * National Water Center
       * NWC Products and Services
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    * River Forecast Centers
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 * More Water Information
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 * Extreme Precipitation Estimates
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       * Current Standard: NOAA Atlas 14
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 * About
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Sources: Esri, TomTom, Garmin, FAO, NOAA, USGS, © OpenStreetMap contributors,
and the GIS User Community



ALL SEARCH RESULTS

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Location Search



200 mi



MAP

Topographic Satellite Dark Light

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LAYERS

 * River Gauge
   Observations & Forecasts
   Long Range Flood Outlook
   
   Categories Observation Forecast
   Major Flood
   4
   2
   Moderate Flood
   6
   6
   Minor Flood
   10
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   6351
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 * Hazards
   
   Filter Enabled All Hydrologic Do Not Display
   
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 * National Water Model
   
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NATIONAL WATER MODEL LAYER

Official NWS streamflow forecasts are produced by NWS hydrologic forecasters for
specific river gauge locations using hydrologic models that are calibrated to
that location. This process considers additional guidance and information from
other available sources, including local expertise and experience, to produce
the best forecast possible. This NWM layer provides access to National Water
Model streamflow guidance, available for approximately 2.7 million stream
reaches.

Use of the NWM Layer
The streamflow network on the NWM layer is shown in the color chosen when the
layer is enabled. As one zooms in, more of the network will be disclosed. At
river gauge locations where there is an official NWS gauge (denoted by a square
and/or circle marker), selecting the marker provides access to the official
hydrograph (“Official” tab) for that gauge and a supplemental hydrograph
(“National Water Model Guidance” tab) for the river reach that contains the
gauge. This supplemental “National Water Model Guidance” hydrograph displays the
NWM model output in addition to the official hydrograph. Selecting a section of
river with no gauge marker (no official forecast) will provide the NWM guidance
hydrograph for that river section.

The NWM is currently undergoing extensive validation and verification to
identify where scientific updates to the model can make the most improvement,
and new versions are planned for release on a regular basis. The NWM output
provides supplemental guidance to NWS forecasters and should not be considered
an official NWS river forecast.

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 * Flood Inundation Enabled
   


FLOOD INUNDATION LAYERS (EXPERIMENTAL)

These services are considered experimental and are undergoing testing for an
area that covers 30% of the U.S. population. Testing of these experimental
services will expand to cover 60% of the U.S. population in September 2025 and
then 100% of the U.S. population in September 2026.

The experimental flood inundation maps represent the National Weather Service's
best approximation of inundation extent based upon modeled river discharge.
These maps are derived from the official River Forecast Center forecasts and
National Water Model analyses and forecast guidance. Flood inundation maps will
display upon zooming in where river flow information depicts flooding or flow
exceeds regionally derived high water thresholds.

Please visit https://www.weather.gov/owp/operations for more information about
the experimental National Water Center Visualization services and the
experimental Flood Inundation Mapping services. Services can be accessed
directly by visiting https://maps.water.noaa.gov/server.

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 * National Snow Analysis
   
   Snow Depth
   
   Snow Water Equivalent

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 * Administrative Boundaries
   
   Line Type Enabled
   
   RFC
   
   State
   
   Opacity 100% Color
   
   --------------------------------------------------------------------------------
   
   
   WFO
   
   County





HYDROLOGIC DISCUSSION

EXPERIMENTAL

Area Hydrologic Discussion
Archive
National Hydrologic Discussion
Archive


FLOOD OUTLOOK

EXPERIMENTAL

Flood Hazard Outlook
Archives: National Tropical
 * Help
 * Glossary
 * Disclaimer
 * Information Quality
 * Privacy Policy
 * Career Opportunities
 * Freedom of Information Act (FOIA)

 * Seasonal Preparedness
 * Turn Around Don't Drown
 * NWS Education Resources

 * Follow us on Twitter
 * OWP on GitHub
 * Follow us on YouTube

Comments? Questions? Please Contact nwps.webmaster@noaa.gov.


EXPERIMENTAL: AREA HYDROLOGIC DISCUSSION 29. OKTOBER 2024



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EXPERIMENTAL: NATIONAL HYDROMET DISCUSSION 28. OKTOBER 2024

National Hydromet Discussion 28. Oktober 2024National Hydromet Discussion 27.
Oktober 2024National Hydromet Discussion 26. Oktober 2024National Hydromet
Discussion 25. Oktober 2024National Hydromet Discussion 24. Oktober 2024National
Hydromet Discussion 23. Oktober 2024National Hydromet Discussion 22. Oktober
2024




000
AGUS74 KWCO 281518
HMDNWC

National Hydrologic Discussion - EXPERIMENTAL
NWS National Water Center - Tuscaloosa AL
1015 AM CDT MON OCT 28 2024

.Synopsis...
Flooding impacts will continue across Hawaii through today... Rainfall
expected for the Southern Plains into the Mid-Mississippi Valley mid to
late week... Flooding and mudslides possible this week across Puerto
Rico... River flooding continues in Central Florida...

.Discussion...

.Hawaii...
Moderate to locally heavy rainfall will continue through today as a moist
air mass remains in place. Given already saturated soils across most of
the island chain, additional rainfall will likely cause additional flooding
impacts, especially in urban areas where they may see more significant
flooding and possible property damage due to rapid runoff. Conditions will
begin to improve on day 2 (Tue) as more stable air moves into the region.

.Southern Plains into the Mid-Mississippi Valley...
Several rounds of moderate to heavy rainfall will fall across the area of
concern, producing a wide swath of 2 - 4" (WPC), on days 3 - 7 (Wed - Sun),
which may bring an isolated flooding threat to the region. Ahead of this
rainfall, antecedent conditions are very dry, where moderate to extreme
drought conditions are in place (USDM) and streamflows are running below to
much below normal (USGS). Most of this rainfall is expected to be
beneficial, with little to no hydrologic responses expected. However,
isolated areas of lowland flooding or urban flash flooding cannot be ruled
out in areas of heavier rainfall. Looking ahead, model guidance suggests
this unsettled pattern will continue beyond day 7 (Sun). The latest
guidance from the GFS-forced National Water Model is indicating scattered
small stream responses from portions of northern TX through eastern MO on
days 8 - 10. Confidence is low in the placement and magnitude of these
responses given the extended time frame however, some potential for at
least localized flooding towards the end of the forecast period is present,
especially in areas where soils become wet from subsequent rounds of
rainfall.

.Puerto Rico...
A wet and unstable pattern beginning on day 2 (Tue) will generate periods
of heavy rainfall which may promote urban and small stream flooding,
isolated flash flooding, and mudslides in areas of steep terrain through
the end of the week.

.Central Florida...
Moderate to major river flooding will continue for the foreseeable future
along the Withlacoochee and St. Johns rivers.

//JDP





$$



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