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000
NOUS41 KWBC 141910
PNSWSH

Service Change Notice 17-134
National Weather Service Headquarters, Silver Spring, MD
310 PM EST Thu Dec 14 2017

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

From:    Terrance J. Clark
    Director, WSR-88D Radar Operations Center

Subject:    Supplemental Low Elevation Angle Implemented
    due to Urgent Mission Needs at KMUX WSR-88D San
    Francisco, CA on or about December 26, 2017

The Radar Operations Center, in conjunction with NWS Western
Region Headquarters and the Weather Forecast Office San
Francisco Bay Area, will implement a supplemental low elevation
angle of +0.2 degrees on or about December 26, 2017. This angle
is in addition to the standard +0.5 degree angle and will be
included in all Volume Coverage Patterns (VCPs).

Due to historic California wildfires and burn scars, there is an
urgent need to lower the elevation angle at KMUX for improved
detection of precipitation and associated hazards.

KMUX was previously planned for a low elevation angle test in
spring 2018. An environmental assessment was completed for the
site within the last year and a Finding of No Significant Impact
(FONSI) was determined. The FONSI for KMUX is available here:
https://www.roc.noaa.gov/WSR88D/SafetyandEnv/EAReports.aspx

The low elevation angle field test will continue as planned for
KMUX in spring 2018, with more information provided at a later
date. Due to the urgent circumstances associated with the
California wildfires, the +0.2 angle will be implemented on or
after December 26, 2017 and remain in effect until the start of
the field test in spring 2018.

Changes for external users will be similar to those required
for the low elevation angle of +0.2 degrees at KLGX
Langley Hill, WA.

For questions or comments, please contact:
   Jessica Schultz
   NWS Radar Focal Point
   Radar Operations Center
   Jessica.A.Schultz@noaa.gov
National Service Change Notices are online at:

http://www.weather.gov/os/notif.htm


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