NOUS41 KWBC 221825
PNSWSH
Technical
Implementation Notice 12-31
National Weather
Service Headquarters Washington DC
350 PM EDT Fri
Jun 22 2012
To: National Weather Service (NWS) Offices
Federal Aviation Administration (FAA)
Customers
Family of Services (FOS) Subscribers
Other Customers of NWS Aviation
Forecasts
From: Cynthia Abelman
Chief, Aviation Services Branch
Subject: Ceiling
and Visibility Analysis Product to Become
Operational Effective July 24, 2012
Note: The following changes have no impact on
NOAA
Weather Wire Service subscribers
Effective July
24, 2012, at 1800 Coordinated Universal Time
(UTC), the NWS Aviation
Weather Center in Kansas City, MO, will
make the Ceiling and Visibility Analysis (CVA)
operationally
available on the Aviation Digital Data Service (ADDS)
Website.
CVA presents
simplified area maps of ceiling, visibility and
flight category outlined as:
Ceiling estimates are displayed as
(i) Possible Terrain Obscuration (pale
orange)
for ceilings less than 200 ft agl,
(ii) less than or equal
to 1000 ft agl (pale
yellow) from 200
to 999 ft, agl, and
(iii) 1000 ft agl or greater (pale blue).
Visibility estimates are displayed as
(i) less than 3 miles
(pale yellow), and
(ii) 3 miles or
greater (pale blue).
CVA is intended
to accompany other aviation weather products such
as METARS, AIRMETS, TAFs and Area Forecasts to
help the general
aviation pilot (particularly the VFR-only pilot)
avoid IFR
conditions. To
remain current in rapidly changing conditions,
CVA is updated
every 5 minutes using the latest observations. The
use of CVA should be followed by further
examination of METARs,
TAFs, AIRMETs,
Area Forecasts and other weather information.
CVA primarily is
intended to help the general aviation pilot;
however, CVA's quick-glance overview of ceiling and
visibility
conditions can be useful to others involved in flight
planning or
weather briefing.
CVA initially
will be available only via the ADDS website at:
http://www.aviationweather.gov/adds/cv
For questions
regarding the new CVA product, contact:
Robert Sallee
Senior Software Engineer - Aviation
Weather Center
Kansas City, MO 64153
Phone:
816-584-7256
E-mail: Robert.sallee@noaa.gov
NWS Technical
Implementation Notices are online at:
http://www.nws.noaa.gov/om/notif.htm
$$