Section 15. Severe
Weather Avoidance
Plan (SWAP)
17-15-1. GENERAL
SWAPs are formalized
programs that are of
considerable value
in areas that are
particularly
susceptible to
severe weather. SWAP
statements are
prepared by ARTCC
TMUs and provide
specific details
surrounding a
particular weather
event. The ARTCC
TMUs consider
applicable
alternatives that
may be used to
mitigate expected
airspace impacts.
These include CDRs,
playbook routes,
FEA/FCAs,
capping/tunneling,
AFPs, and any other
TMIs that are being
considered. The SWAP
statement is then
delivered to the
ATCSCC for
discussion and
coordination and may
be sent as a SWAP
advisory. SWAP
advisories are sent
by the ATCSCC and
developed from SWAP
statements and
provide direction to
customers and
facilities on what
TMIs are expected to
be used to manage
airspace
constraints.
Plans that are
properly developed,
coordinated, and
implemented can
reduce coordination
and TM restrictions
associated with
rerouting aircraft
around areas of
severe weather,
resulting in better
utilization of
available airspace.
17-15-2. RESPONSIBILITIES
a. Air
traffic facilities
must:
1. Favor
and accept traffic
flows that are not
normally routed
through their area.
2. Monitor,
evaluate, and adjust
programs to ensure
maximum
effectiveness.
3. Use
the following
procedures when
considering a route
unusable:
(a) Notify
the ATCSCC anytime
airspace,
established flows of
traffic, routes or
any other factor
affecting airborne
capacity becomes or
is expected to
become unusable. The
ATCSCC must be
notified when normal
traffic can be
accepted.
(b) Enter
into the NTML, using
the “SWAP” tab, any
information
regarding unusable
routes and/or routes
that become
available.
(c) Solicit
flights to file
and/or fly routes
that are impacted by
weather, when
appropriate.
(d) Issue
minute-in-trail/mile-in-trail
restrictions that
allow airspace to
remain available
when defined as
“severely
constrained.” A
severely constrained
area is identified
as an airway, fix,
or sector impacted
by any circumstance
that significantly
reduces, but does
not eliminate the
ability to handle
aircraft.
NOTE-
This minimum flow of
traffic will ensure
that demand does not
exceed current
capacity, yet will
assist in
determining the
suitability for
increased traffic
for the impacted
route or area.
(e) Increase
and reduce TMIs as
necessary to
accommodate airspace
impacts.
(f) Record
in NTML two or more
aircraft
identifications:
(1) When
flights deviate
significantly,
and/or elect not to
file or fly on a
route impacted by
weather.
(2) When
flights elect not to
depart and/or land
due to the current
weather conditions.
(3) Forward
flight information
to the ATCSCC.
4. Facilities
may consider issuing
a SWAP statement
indicating all
expected impacts to
available routes and
airspace in their
area of concern. The
SWAP statement
should contain
mitigation
strategies for
expected impacts.
This includes
alternate routes,
use of CDRs, use of
TMIs, altitude
capping/tunneling,
possible FEAs/FCAs,
AFPs, etc.
b. The
ATCSCC must:
1. Obtain
a severe weather
analysis from
weather information
providers and
discuss the findings
with the appropriate
TMU.
2. Conference
affected facilities
and customers to
apprise them of
forecast severe
weather conditions
and the routes or
areas that will be
impacted.
3. Formulate
a dynamic severe
weather operational
plan. Coordinate
TMIs and alternate
routes with all
affected facilities.
4. Use,
to the extent
possible, the
following options in
the order listed
when developing an
operational plan:
(a) Expanded
miles-in-trail
initiatives.
(b) SWAP
advisories.
NOTE-
When developing the
SWAP advisory, the
ATCSCC should
consider all
possible mandatory
and recommended
route options;
applicable CDRs and
playbooks; and the
use of User
Preferred Trajectory
(UPT) and Integrated
Collaborative
Routing (ICR)
strategies.
(c) Reroutes.
(d) Ground
delay programs.
(e) AFPs.
(f) Ground
Stops.
5. Transmit
advisories
describing the
existing or forecast
weather conditions,
the operational
plan, alternate
routes, or
cancellation
thereof.
6. Be
the final approving
authority for
traffic flows and
reroutes.
c. The
ARTCC TMU must:
1. Coordinate
with the ATCSCC when
implementing SWAP
procedures that
affect other ARTCCs.
If possible, this
coordination should
be completed at
least 2 hours prior
to expected
implementation.
2. When
suitable, facilities
should consider
developing a SWAP
statement that
specifies expected
airspace impacts;
developed shared
FEAs representing
airspace impacts;
possible route
closures; effective
times of
constraints; and
expected routing
alternatives
including applicable
CDRs and playbook
routes.
3. Notify
affected facilities
within their area of
responsibility when
SWAP is expected to
be implemented,
including
initiatives,
reroutes, and
affected times.
4. Furnish
the sector or
facility issuing the
revised clearance a
route of flight to a
point where the new
route connects with
the filed route.
5. Notify
the ATCSCC and
affected facilities
within their area of
responsibility when
normal routings can
be resumed.
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