The NWS unveils new experimental flood inundation maps for a lot of japanese Texas, central Pennsylvania and components of the Northeast

The NWS unveils new experimental flood inundation maps for a lot of japanese Texas, central Pennsylvania and components of the Northeast

The brand new providers will assist emergency and water managers put together for and reply to floods

September 26, 2023 – Floods are the most typical risk related to extreme climate and the most costly pure catastrophe in america. To enhance flood warning communications and assist emergency managers put together for and reply to floods, the Nationwide Climate Service (NWS) has begun including new pilot flood inundation mapping providers to its suite of forecasting merchandise. These new providers complement and help the issuance of flood warnings and watches by offering close to real-time, high-resolution street-level visualizations displaying the place, when and the way a lot flood water is predicted.

“This new flood modeling functionality gives actionable data for emergency and water useful resource managers to arrange for, mitigate and reply to flood impacts,” mentioned David Valley, director of Service Innovation and Partnerships at NOAA’s Nationwide Water Middle. “These providers will considerably enhance our means to offer impact-based resolution help providers to our companions to allow them to place individuals and sources upfront of flood occasions.”

New NWS experimental flood inundation maps assist talk the timing and magnitude of excessive water occasions by displaying the mannequin’s inundated areas in blue. Emergency managers might use these providers to pre-position sources, safe vital infrastructure, and advocate evacuations and evacuation routes. Credit score: NOAA

The brand new providers at the moment are out there, offering preliminary mapping capabilities to about 10% of the U.S. inhabitants, or greater than 30 million individuals, throughout a lot of East Texas and components of the Mid-Atlantic and Northeast. These areas have been chosen to obtain Part I flood inundation mapping based mostly on flood potential, susceptible populations, and native participation in NOAA demonstrations of those capabilities, together with floor flood workout routines. NOAA’s Nationwide Climate Service is searching for public touch upon the brand new pilot providers via September 30, 2024.

Pictured: A map highlighting new pilot flood services offered by the NWS.
The inexperienced zones — most of japanese Texas, central Pennsylvania and components of the Northeast — are the place the NWS’s new pilot flood providers will probably be out there to greater than 30 million individuals beginning September 26, 2023. Credit score NOAA

NWS’s new flood influence data providers embody three near-real-time merchandise:

NWS will increase its flood inundation mapping providers to 30% of the U.S. inhabitants in 2024, 60% in 2025, and 100% in 2026. Further flood inundation mapping merchandise will probably be supplied in future releases. When totally revealed in 2026, flood inundation maps will probably be out there for 110,000 river miles close to NWS River Prediction Middle forecast level areas, and for 3.4 million river miles lined by Nationwide Water Mannequin forecasts.

Maps will be considered within the NWS Nationwide Viewer. The data can be offered as an ordinary GIS net service format that enables for straightforward integration into GIS purposes utilized by emergency and water managers. The Nationwide Water Middle Operations net web page has extra details about accessing the visuals.

To develop the brand new maps, NOAA’s Nationwide Water Middle labored in coordination with the Nationwide Climate Service’s river forecast facilities and climate forecast workplaces together with federal companions and others. New flood mapping providers make use of the Peak Above Nearest Drainage (HAND) technique, a low-complexity, terrain-based technique for flood mapping. It makes use of a digital elevation mannequin (DEM) produced by the USGS’s 3DElevation program and the NHDPlus Hydrography stream grid dataset produced by the USGS to create a “water texture.” The water texture represents land floor elevations at a decision of 10 m, akin to the placement of the community of stream and river channels represented as vectors or strains.

NOAA’s new experimental flood maps and forecast providers are funded partly by the bipartisan infrastructure invoice, as are next-generation water modeling actions, together with latest rainfall replication and potential excessive research. Please go to the Bipartisan Infrastructure Act web site to study different present and future funding alternatives.

Assets: Story map about new flood maps and providers

Media Contact: Maureen Oleary, NOAA Communications,

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