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NOUS41 KWBC 151930
PNSWSH

Service Change Notice 25-53
National Weather Service Headquarters Silver Spring MD
330 PM EDT Tue Jul 15 2025

TO: SUBSCRIBERS:
 -NOAA Weather Wire Service
 -Emergency Managers Weather Information Network
 -NOAAPort
 Other NWS Partners and NWS Employees

FROM: David Michaud
 Director, NCEP Central Operations (NCO)

SUBJECT:  Notification of Upgrade to the Model Analyses and
Guidance (MAG) Website to version 6.0.4 Effective August 20,
2025

The Model Analyses and Guidance (MAG) website
(https://mag.ncep.noaa.gov) will be upgraded to version 6.0.4,
on or about August 20, starting with the 1200 UTC cycle.  In the
case of Critical Weather Day or Enhanced Caution Event
declaration, the upgrade will take place on the next working day
that does not have significant weather.  The upgrade includes
the following:

-Addition of the following new products for National Blend of
Models (NBM):
North America and CONUS domains: precip_p01,
1hour_precip_chance, 6hour_precip_chance, 12hour_precip_chance,
precip_duration, prob_rain, prob_snow, prob_sleet,
prob_freezing_rain, snow_liquid_ratio, 1hour_accu_snow,
6hour_accu_snow, total_accu_snow, 10th_percentile_1hr_snow,
50th_percentile_1hr_snow, 90th_percentile_1hr_snow,
prob_1h_snow_0.1in, prob_1h_snow_0.3in, prob_1h_snow_0.5in,
prob_1h_snow_0.7in, prob_1h_snow_1in, prob_1h_snow_1.5in,
prob_1h_snow_2in, prob_1h_snow_3in, prob_1h_snow_4in,
tstm_coverage, visibility, ceiling, cape, echo_top, prob_tstm,
prob_vis_5mi, prob_vis_3mi, prob_vis_2mi, prob_vis_1mi,
prob_ceil_1000ft, prob_ceil_2000ft, prob_ceil_3000ft,
prob_ceil_6500ft

Alaska domain:
precip_p01, 1hour_precip_chance, 6hour_precip_chance,
12hour_precip_chance, prob_rain, prob_snow, prob_sleet,
prob_freezing_rain, snow_liquid_ratio, 1hour_accu_snow,
6hour_accu_snow, total_accu_snow, 10th_percentile_1hr_snow,
50th_percentile_1hr_snow, 90th_percentile_1hr_snow,
prob_1h_snow_0.1in, prob_1h_snow_0.3in, prob_1h_snow_0.5in,
prob_1h_snow_0.7in, prob_1h_snow_1in, prob_1h_snow_1.5in,
prob_1h_snow_2in, prob_1h_snow_3in, prob_1h_snow_4in,
tstm_coverage, visibility, ceiling, cape, echo_top, prob_tstm

Hawaii and Puerto Rico domains:
precip_p01, 1hour_precip_chance, 6hour_precip_chance,
12hour_precip_chance, tstm_coverage, visibility, ceiling, cape,
echo_top, prob_tstm

-Addition of the following new product for Guam domain for Real
Time Mesoscale Analysis (RTMA) model: ceiling

-Improved Real Time Mesoscale Analysis (RTMA) and National Blend
of Models (NBM) model output image quality and color palette.

-Fixed display of extra domain for North American Mesoscale
Model(NAM)Fire Weather High Resolution Nested Runs(Firewx)
model.

-Fixed data flickering for accu_max_updraft_hlcy for North
American Mesoscale Model 3km(nam-hires), High Resolution
Window/Advanced Research Weather Research and Forecast Model-
Member (hrw-arw)and High Resolution Window/Advanced Research
Weather Research and Forecast Model- Member 2 (hrw-arw2)

-Truncated High Resolution Window/Non-Hydrostatic, hybrid, vert
coordinate Mesoscale Model (hrw-fv3) accu_max_updraft_hlcy
product forecast hours to 48 to ensure accurate output.

-Fixed occasional filling of one probability value in the entire
domain for probability of storm-tracks maps.

MAG suite will be hosted on https://mageval.ncep.noaa.gov for a
period of 30 days before going live.


For technical questions regarding this notification, please
contact:

Anne Myckow
Chief, Software Development Branch
NCEP Central Operations
sdb.support@noaa.gov

National Service Change Notices are online at:

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