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conditions beginning within the next 2 hours. If
conditions are expected to persist beyond the time of
the valid period and/or if conditions extend beyond
the ARTCC area, statements to this effect should be
included in the text. The CWSU will issue a CWA:
1. When necessary as a supplement to an
existing WS (including WSTs), to an existing WA, or
to an existing FA section. The issuance of a CWA
under these circumstances should be limited to
occasions when, in the judgment of the CWSU
meteorologist, real time information adequately
supports the issuance of a redefining statement
update or advanced amendment. Such real time
information regarding the phenomenon covered by a
NAWAU product may be pilot reports, radar satellite,
or information from other sources. The purpose of the
CWA, under these circumstances, is to improve or to
update the definition of the phenomenon in terms of
relevance to users in the ARTCC area regarding the
phenomenon's location, movement, extent, and
intensity. A CWA, for example, describing an IFR
WAs area of low IFR (LIFR) conditions in terms of
ARTCC reference points would be a valid
redefinition of the location and intensity relevant to
the ARTCC's area and would meet documented
requirements.
2. When an inflight advisory has not yet been
issued, but the observed or expected weather
conditions meet WS or WA criteria based on current
pilot reports and reinforced by other sources of
information concerning existing meteorological
conditions. In this situation, the CWSU
meteorologist should call the appropriate forecaster
at the NAWAU or appropriate Alaska WSFO. If the
CWSU forecaster determines that it is necessary to
issue a CWA to allow lead time while the WS/WA is
being prepared, the CWA will be issued, and the
CWA should indicate that a WS/WA will be issued
shortly.
3. The CWSU meteorologist may issue a CWA
when observed, or developing weather conditions do
not meet WS (including WST) or WA criteria but
current pilot reports or other weather information
sources indicate that an existing, or anticipated,
meteorological phenomena will adversely affect the
safe flow of air traffic within the ARTCC area of
responsibility. In this situation, the data available
must be sufficient, in the judgment of the CWSU
meteorologist, to support both the issuance of such an
advisory and, if necessary, its continuation.
b. The CWA will describe the location of the
phenomenon using ARTCC relevant points of
reference, such as VORs, and will include the height,
extent, intensity, and movement of the phenomenon.
Each CWA will have a phenomenon number (1
through 6) immediately following the ARTCC
identifier in the CWA message heading. A separate
phenomenon number will be assigned to each
meteorologically distinct condition or group of
conditions, such as jetstream clear air turbulence or
LIFR/icing conditions northwest of a low pressure
center. The use of phenomenon numbers make it
possible to store and disseminate up to six unrelated
CWA conditions with each condition capable of
being updated. Forecasters should be aware that the
CWA is stored and disseminated as a replaceable
product. This means that each subsequent CWA
issuance must contain all the pertinent and known
details of the conditions meeting CWA issuance
criteria, including the continuing conditions described
in the previously issued CWAs. CWAs will
also be numbered sequentially, beginning at
midnight local time each day. The sequential CWA
issuance number will be followed by the related
two-digit, alphanumeric designator for inflight
advisories in effect if applicable. The CWA
communications heading will also contain the CWA
date/time of issuance in UTC and the “valid until”
JO 7110.10T 2/14/08
9-11-2 Center Weather Advisory (CWA)
date/time in UTC. The difference between these two
times will not exceed 2 hours.
c. The format of the CWA communications header
is: (ARTCC designator)(phenomenon number) CWA
(date/time issued in UTC)/(ARTCC designator)
CWA (issuance number) VALID UNTIL (date/time
in UTC)/(FROM) (affected area)/(text).
EXAMPLEZOB1
CWA 032141
ZOB CWA 101 VALID UNTIL 032300
FROM 10S DET TO 40N DJB TO 40E SBN TO 80SE MKG
LN SEV TSTMS WITH EXTRM PCPN MOVG FROM
2525 3/4 INCH HAIL RPRTD LAST 5 MINS 20 SW YIP.
TSTMS WITH HVY TO EXTRM PCPN CONTG DTW
AREA BYD 2300
ZKC1 CWA 121528
ZKC CWA 102 VALID UNTIL 121728
STL DIAM 30 NM. NMRS RPTS OF MOD TO SEV ICG
080/090.. LGT OR NEG ICG RPTD 040/120 RMNDR OF
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