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27A MBA 35K- 2MF 250 20
NOTE-
(See FIG 7-1-18 to see how the TDWR/WSP determines
the microburst location).
This is what the controller will say when issuing the
alert.
PHRASEOLOGYRUNWAY
27 ARRIVAL, MICROBURST ALERT, 35 KT
LOSS 2 MILE FINAL, THRESHOLD WIND 250 AT 20.
In plain language, the controller is telling the pilot
that on approach to runway 27, there is a microburst
alert on the approach lane to the runway, and to
anticipate or expect a 35 knot loss of airspeed at
approximately 2 miles out on final approach (where
it will first encounter the phenomena). With that
information, the aircrew is forewarned, and should be
prepared to apply wind shear/microburst escape
procedures should they decide to continue the
approach. Additionally, the surface winds at the
airport for landing runway 27 are reported as
250degrees at 20 knots.
NOTEThreshold
wind is at pilot's request or as deemed
appropriate by the controller.
REFERENCEFAA
Order JO 7110.65, Air Traffic Control, Low Level Wind
Shear/Microburst Advisories, Paragraph 3-1-8b2(a).
AIM 2/14/08
7-1-52 Meteorology
FIG 7-1-18
Microburst Alert
(b) WIND SHEAR ALERTS
EXAMPLEThis
is what the controller sees on his/her ribbon display
in the tower cab.
27A WSA 20K- 3MF 200 15
NOTE-
(See FIG 7-1-19 to see how the TDWR/WSP determines
the wind shear location).
This is what the controller will say when issuing the
alert.
PHRASEOLOGYRUNWAY
27 ARRIVAL, WIND SHEAR ALERT, 20 KT
LOSS 3 MILE FINAL, THRESHOLD WIND 200 AT 15.
In plain language, the controller is advising the
aircraft arriving on runway 27 that at about 3 miles
out they can expect to encounter a wind shear
condition that will decrease their airspeed by 20 knots
and possibly encounter turbulence. Additionally, the
airport surface winds for landing runway 27 are
reported as 200 degrees at 15 knots.
NOTEThreshold
wind is at pilot's request or as deemed
appropriate by the controller.
REFERENCEFAA
Order JO 7110.65, Air Traffic Control, Low Level Wind
Shear/Microburst Advisories, Paragraph 3-1-8b2(a).
2/14/08 AIM
Meteorology 7-1-53
FIG 7-1-19
Weak Microburst Alert
AIM 2/14/08
7-1-54 Meteorology
FIG 7-1-20
Gust Front Alert
(c) MULTIPLE WIND SHEAR ALERTS
EXAMPLEThis
is what the controller sees on his/her ribbon display
in the tower cab.
27A WSA 20K+ RWY 250 20
27D WSA 20K+ RWY 250 20
NOTE-
(See FIG 7-1-20 to see how the TDWR/WSP determines
the gust front/wind shear location.)
This is what the controller will say when issuing the
alert.
PHRASEOLOGYMULTIPLE
WIND SHEAR ALERTS. RUNWAY 27
ARRIVAL, WIND SHEAR ALERT, 20 KT GAIN ON
RUNWAY; RUNWAY 27 DEPARTURE, WIND SHEAR
ALERT, 20 KT GAIN ON RUNWAY, WIND 250 AT 20.
EXAMPLEIn
this example, the controller is advising arriving and
departing aircraft that they could encounter a wind shear
condition right on the runway due to a gust front
(significant change of wind direction) with the possibility
of a 20 knot gain in airspeed associated with the gust front.
Additionally, the airport surface winds (for the runway in
use) are reported as 250 degrees at 20 knots.
REFERENCEFAA
Order JO 7110.65, Air Traffic Control, Low Level Wind
Shear/Microburst Advisories, Paragraph 3-1-8b2(d).
2/14/08 AIM
Meteorology 7-1-55
6. The Terminal Weather Information for
Pilots System (TWIP).
(a) With the increase in the quantity and
quality of terminal weather information available
through TDWR, the next step is to provide this
information directly to pilots rather than relying on
voice communications from ATC. The National
Airspace System has long been in need of a means of
delivering terminal weather information to the
cockpit more efficiently in terms of both speed and
accuracy to enhance pilot awareness of weather
hazards and reduce air traffic controller workload.
With the TWIP capability, terminal weather
information, both alphanumerically and graphically,
is now available directly to the cockpit on a test basis
at 9 locations.
(b) TWIP products are generated using
weather data from the TDWR or the Integrated
Terminal Weather System (ITWS) testbed. TWIP
products are generated and stored in the form of text
and character graphic messages. Software has been
developed to allow TDWR or ITWS to format the
data and send the TWIP products to a database
resident at Aeronautical Radio, Inc. (ARINC). These
products can then be accessed by pilots using the
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