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NCWF does NOT distinguish among level 3 through
level 6 on the NCWF hazard scale (see TBL 7−1−3).
6. The NCWF may not detect or forecast:
(a) Some embedded convection.
(b) Low−topped convection containing little
or no cloud−to−ground lightning (such as may occur
in cool air masses).
(c) Rapidly evolving convection.
7. The NCWF cannot provide information on
specific storm hazards such as hail, high winds or
tornadoes.
c. Availability and Use.
1. The NCWF is available primarily via the
Internet from the AWC Aviation Digital Data Service
(ADDS) at http://adds.aviationweather.noaa.gov.
Used in conjunction with other weather products such
as Convective SIGMETs, the NCWF provides
additional information for convective weather
avoidance and flight planning.
2. The NCWF access by Automated Flight
Service Stations and their associated En Route Flight
Advisory Service Facilities, Air Route Traffic
Control Centers (ARTCCs) or Terminal Radar
Approach Controls is planned but NOT currently
available.
NOTE−
See AIM, paragraph 7−1−15, ATC Inflight Weather
Avoidance Assistance, for further information.
8/5/04 AIM
Meteorology 7−1−33
d. Display Summary.
1. Existing convective hazards (based on
NEXRAD and lightning data) are depicted using the
color−coded 6−level NCWF hazard scale shown in
TBL 7−1−3. In displaying forecast cell locations, the
NCWF does NOT distinguish among level 3 through
level 6.
TBL 7−1−3
NCWF Hazard Scale
Level Color Effect
5−6 Red Thunderstorms may contain any
3−4 Yellow ll f th f ll i
Orange
or all of the following: severe
turbulence, severe icing, hail,
frequent lightning, tornadoes
1−2 Green
and low−level wind shear. The
risk of hazardous weather
generally increases with levels
on the NCWF hazard scale.
NOTE−
Although similar, the NCWF hazard scale levels are NOT
identical to VIP levels.
REFERENCE−
Pilot/Controller Glossary Term− Radar Weather Echo Intensity Levels.
2. One−hour forecast locations of signification
convection (NCWF hazard scale levels of 3 or
greater) are depicted with blue polygons. Their
directions of movement and storm tops are also
shown.
3. The Java display permits some degree of
customization. Other means of viewing the NCWF
may not offer these display options. Java display
options include the following (see FIG 7−1−12):
(a) “Current Convective Interest Grid.”
(b) “One−Hour Extrapolation Polygons.”
(c) “Previous Performance Polygons.”
(d) Storm speed and altitude of tops.
(e) Overlays of:
(1) Airport locations.
(2) County boundaries.
(3) ARTCC boundaries.
(f) Aviation Routine Weather Reports
(METARs).
(g) Unlimited customized zooms (by holding
down the left mouse button and dragging to select the
rectangle of coverage desired).
4. The JavaScript display options include the
following (see FIG 7−1−13):
(a) Current convective hazard “Detection”
field.
(b) 1−hour extrapolation “Forecast” polygons.
(c) Previous hour “Performance” polygons.
(d) “2 hr Movie” loops of convective hazard
detection fields (with forecast polygons included on
the last frame).
(e) “24 hr Movie” loops of convective hazard
detection fields.
(f) Zoomed views of:
(1) ARTCC boundaries.
(2) Certain major airports.
(3) Seven geographical regions: Northwest,
North Central, Northeast, Southwest, South
Central, Southwest, the 48 contiguous states.
5. Additional information is available via the
“FYI/Help” or “i” links on the Java and JavaScript
displays, respectively.
AIM 8/5/04
7−1−34 Meteorology
FIG 7−1−12
Example NCWF Java Display
8/5/04 AIM
Meteorology 7−1−35
FIG 7−1−13
Example NCWF JavaScript Display
AIM 8/5/04
7−1−36 Meteorology
7−1−15. ATC Inflight Weather Avoidance
Assistance
a. ATC Radar Weather Display.
1. Areas of radar weather clutter result from rain
or moisture. Radars cannot detect turbulence. The
determination of the intensity of the weather
displayed is based on its precipitation density.
Generally, the turbulence associated with a very
heavy rate of rainfall will normally be more severe
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