Public Information Statement
Issued by NWS National HQ

Home |  Current Version |  Previous Version |  Graphics & Text |  Print | Product List |  Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
816
NOUS41 KWBC 251530 AAB
PNSWSH

Public Information Statement 22-43 Updated
National Weather Service Headquarters Silver Spring MD
1130 AM EDT Wed Sep 25 2024

To: Subscribers:
 -NOAA Weather Wire Service
 -Emergency Managers Weather Information Network
 -NOAAPort
 Other NWS Partners, Users and Employees

From: Dr. Thomas Graziano
 Director, Office of Water Prediction

Subject: Updated: Extending Comment Period on the National Water
Center`s Experimental Area Hydrologic Discussion Product through
June 30, 2025

Updated to extend the comment period through June 30, 2025.

Reference: Public Information Statement (PNS) 22-43, issued
April 27, 2023:

https://www.weather.gov/media/notification/pdf_2023_24/pns22-
43_area_hydrologic_discussion_aaa.pdf

The NWS is extending the comment period for the Experimental
Area Hydrologic Discussion (AHD) Product through June 30, 2025.
The AHD was updated during the previous comment period to remove
the seconds from the valid and issuance times listed on the
graphics, and only show the legends for layers that are present
on the product graphics.

The NWS is soliciting comments and feedback on the Experimental
AHD Product through June 30, 2025. The experimental AHD provides
a near-term discussion of the potential for the rapid-onset of
flooding and its related impacts by concentrating on very
specific areas of the continental United States (CONUS).
Information contained in the AHD includes analysis of the
National Water Model (NWM) Short-Range Forecast (SRF) 12-hour
rapid-onset flooding probabilities and other outputs, such as
high water probabilities, high flow magnitude analysis, and/or
past 7- or 14-day average high flow magnitude analysis.

This NWC product is intended to be used by NWS field offices to
aid in the flash flood watch and warning decision-making
process, and support Impact-based Decision Support Services
(IDSS) and NOAAs mission of saving lives and property. The
product may also be used by NWS Core Partners as part of IDSS
and is available publicly. The AHD is issued only during times
in which the atmospheric and current antecedent conditions
support potential hydrologic and flood related impacts with
respect to flash, urban, or small stream flooding and is not
supported 24x7 during this experimental phase.

The experimental AHD features a graphic and text combination to
represent the potential developing flood related impacts. The
text includes a list of the threat (what), areas affected
(where), and timing (when) in the header, applicable current
conditions (e.g., Quantitative Precipitation Estimates, soil
moisture, streamflow status), and a discussion on how antecedent
conditions, combined with forecast rainfall, could potentially
result in rapid-onset flooding.

The experimental AHD is accessible from the National Water
Prediction Service (NWPS) at: https://water.noaa.gov

Please provide comments and feedback through the NWS official
survey:

https://www.surveymonkey.com/r/ExpAreaHydroDisc_2024-25

More information about the experimental AHD can be found in the
Product Description Document at:

https://nsdesk.servicenowservices.com/api/g_noa/nwspc/res2/59846
7bf47981e90f6550c03e16d4396

For additional questions or comments on this product, please
contact:

Russ Barton
National Water Center
Tuscaloosa, AL
Email: russ.barton@noaa.gov

The Public Information Statement announcing the initial comment
period for the experimental AHD product is online at:

https://www.weather.gov/media/notification/pdf_2023_24/pns22-
43_area_hydrologic_discussion_aaa.pdf

National Public Information Statements are online at:

https://www.weather.gov/notification/