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NOUS41 KWBC 251700
PNSWSH

Public Information Statement 25-52
National Weather Service Headquarters Silver Spring MD
100 PM EDT Fri Jul 25 2025

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

From: Fanglin Yang
 Chief, Physics and Dynamics Division
 NCEP/Environmental Modeling Center

Subject: Soliciting Comments through August 24, 2025 on the
Proposed Discontinuation of the Global Ensemble Forecast System
(GEFS) Aerosol component 06 and 18 UTC forecasts.

The Environmental Modeling Center (EMC) is soliciting comments
through August 24, 2025 on the proposed discontinuation of the
Global Ensemble Forecast System (GEFS) aerosol component
forecasts initialized at 06 and 18 UTC. The proposed termination
date for these products is on or before April 1, 2026.

The GEFS aerosol component provides 120 hour global forecasts of
dust, sea salt, smoke from wildfires, and other particles in the
atmosphere that can impact visibility or human health. Currently
these forecasts are initialized four times per day at 00, 06,
12, and 18 UTC valid times. EMC proposes reducing the frequency
of the aerosol component initialization from four times per day
to only the 00 and 12 UTC valid times. No changes to the 00 or
12 UTC initialized forecasts for the GEFS aerosol component are
proposed. No changes to the GEFS ensemble forecasts or control
member forecasts initialized for the 06 or 18 UTC cycles are
proposed.

EMC proposes discontinuing the 06 and 18 UTC forecasts of the
GEFS aerosol member and is soliciting comments through August
24, 2025

To provide feedback regarding this change please contact:

Email: emc.products.feedback@noaa.gov
Google Form: Soliciting Comments on the Removal of GEFS 06UTC
and 18UTC Aerosol Forecasts

National Public Information Statements are online at:
https://www.weather.gov/notification