Public Information Statement
Issued by NWS National HQ

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NOUS41 KWBC 241800 AAB

Service Change Notice 20-85 Updated
National Weather Service Headquarters Silver Spring, MD
200 PM EDT Tue Nov 24 2020

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

From:  Ben Kyger, Director
  NCEP Central Operations

Subject:  Updated: Replacement of RIDGE I radar with RIDGE II
Radar Web Page Effective on or about December 16, 2020

Updated to adjust the go-live date of the new NWS Radar Webpage
from December 8, 2020, to December 16, 2020. This notice serves
as a final notification to users that they must be prepared for
the new services.

The Radar Integrated Display with Geospatial Elements (RIDGE)
Radar Version II will operationally replace RIDGE Radar Version
I on December 16, 2020 at 15 UTC, pending Critical Weather Day
(CWD) declaration. To allow users to transition to RIDGE II
before the discontinuance of RIDGE Version I, there will be a
parallel running of both:

RIDGE I: (Current operational URL)
RIDGE II: (Parallel URL)

During the period between September 11 and December 16, the
National Centers for Environmental Prediction (NCEP) Central
Operations (NCO) will support both RIDGE I and RIDGE II to allow
users time to transition to the new services. During the overlap
period, RIDGE I will be the primary system for radar data
products. Then, on or about December 16, 2020, RIDGE II will
replace RIDGE I as the operational system for radar data
products on A final notification
regarding the transition to operational status will be sent
ahead of the full transition date, on or about November 8. If
there are any changes to this plan, notification will be

RIDGE II will replace the FLASH-enabled RIDGE I with HTML5 and
Javascript within a web-based and also mobile-friendly display.
This display utilizes Multi-Radar Multi-Sensor (MRMS) datasets
on an interactive map containing Open Geospatial Consortium
(OGC) compliant layers. Along with the included radar products,
users would also have the ability to display NWS long- and
short-fused Watches, Warnings, and Advisories.

The web map is optimized for small and large screen devices.
Users can bookmark a particular perspective of the map view or
select and save a particular radar view. As a result, the
current individual NWS radar web pages that display specific
Weather Surveillance Radar-1988 Doppler (WSR-88D) Radar products
will also be discontinued. These web pages (e.g.,; where aaa is the
3-letter identifier of the radar) will be discontinued along
with RIDGE I.

The geoTIF images can be accessed at:

MRMS is undergoing its own upgrade and this test URL will change
to a production URL on its go-live date. Please check this SCN
for the timing of that:

During the public comment collection period, the following
issues were identified and resolved: issues with state overlay
toggling capabilities; issues with the appearance of local radar
identifiers; radar transparency levels of the NWS
Watch/Warning/Advisory (WWA) overlays, and the radar product
naming conventions (product descriptions). Additionally,
bookmarking based on user selections has been enabled.

A second round of public comments identified the following
issues that were resolved on 10/9/2020:
- Generated radar base reflectivity gif images and animated gif
images as replacements for Ridge1 static images
- Added PGUA_BVEL layer configuration to required NEXRAD Level 3
Base Radial Velocity layers
- Updated the bookmarks to recenter on selected local radar
- Added Style Rules for displaying "Air Quality Alerts" and
"Tropical Cyclone Statement" hazard products
- Updated radar stations properly show status

It was identified in testing that the precipitation accumulation
GeoTIFF and NetCDF files for time frames of 1, 2, 3, 6, and 12
hours contain data whose usefulness has not been determined.
Since 12 UTC and day 1, 2, 3, 4, 5, and 6, include 3 bands (Band
2: PRISM normals, Band 3: Departure from normal and Band 4:
Percent of normal) that are not determined to be useful, the
bands within the files may be discontinued at any time in the

An online frequently asked questions and brief tutorial document
is available on the web page:

For further details, please see the Product Description

For any additional comments or questions regarding the
information in this notice, please contact:

IDP GIS Support Team
Silver Spring, MD 20910

For issues regarding the operational support of the RIDGE II
application, please contact:

NCO Operations and Monitoring Branch

NWS Public Information Notices are online at: is the U.S. government's official web portal to all federal, state and local government web resources and services.