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(altitude). PRECIPITATION AREA IS (number) MILES IN
DIAMETER.
EXAMPLE-
1. “Extreme precipitation between eleven o'clock and
oneo'clock, one zero miles moving east at two zero knots,
tops flight level three niner zero.”
2. “Heavy precipitation between ten o'clock and
twoo'clock, one five miles. Precipitation area is two five
miles in diameter.”
3. “Heavy to Extreme precipitation between ten o'clock
and two o'clock, one five miles. Precipitation area is
twofive miles in diameter.”
REFERENCEP/
CG Term- Precipitation Radar Weather Descriptions.
e. When precipitation intensity information is not
available.
PHRASEOLOGYPRECIPITATION
BETWEEN (number) O'CLOCK AND
(number) O'CLOCK, (number) MILES. MOVING
(direction) AT (number) KNOTS, TOPS (altitude),
PRECIPITATION AREA IS (number) MILES IN
DIAMETER, INTENSITY UNKNOWN.
EXAMPLE-
“Precipitation area between one o'clock and threeo'clock
three five miles. Precipitation area is three zero miles in
diameter, intensity unknown.”
NOTEPhraseology
using precipitation intensity descriptions is
only applicable when the radar precipitation intensity
information is determined by NWS radar equipment or
NAS ground based digitized radar equipment with weather
capabilities. This precipitation may not reach the surface.
f. EN ROUTE. When issuing Air Route Surveillance
Radar (ARSR) precipitation intensity use the
following:
1. Describe the lowest displayable precipitation
intensity as MODERATE.
2. Describe the highest displayable precipitation
intensity as HEAVY to EXTREME.
PHRASEOLOGY-
(Intensity) PRECIPITATION BETWEEN (number)
O'CLOCK AND (number) O'CLOCK, (number) MILES
MOVING (direction) AT (number) KNOTS, TOPS
(altitude) PRECIPITATION AREA IS (number) MILES IN
DIAMETER.
JO 7110.65S 2/14/08
2-6-4 Weather Information
EXAMPLE-
“Moderate precipitation between ten o'clock and
oneo'clock, three zero miles. Precipitation area is fivezero
miles in diameter.”
“Moderate to extreme precipitation twelve o'clock and
three o'clock, seven zero miles. Precipitation area is
onezero zero miles in diameter.”
g. When operational/equipment limitations exist,
controllers shall ensure that the highest available
level of precipitation intensity within their area of
jurisdiction is displayed.
h. The supervisory traffic management
coordinator-in-charge/operations supervisor/
controller-in-charge shall verify the digitized radar
weather information by the best means available
(e.g., pilot reports, local tower personnel, etc.) if the
weather data displayed by digitized radar is reported
as questionable or erroneous. Errors in weather radar
presentation shall be reported to the technical operations
technician and the air traffic supervisor shall
determine if the digitized radar derived weather data
is to be displayed and a NOTAM distributed.
NOTEAnomalous
propagation (AP) is a natural occurrence
affecting radar and does not in itself constitute a weather
circuit failure.
2-6-5. CALM WIND CONDITIONS
TERMINAL. Describe the wind as calm when the
wind velocity is less than three knots.
REFERENCEFAAO
JO 7110.65, Para 3-5-3, Tailwind Components.
FAAO JO 7110.65, Para 3-10-4, Intersecting Runway Separation.
2-6-6. REPORTING WEATHER
CONDITIONS
a. When the prevailing visibility at the usual point
of observation, or at the tower level, is less than
4miles, tower personnel shall take prevailing
visibility observations and apply the observations as
follows:
1. Use the lower of the two observations (tower
or surface) for aircraft operations.
2. Forward tower visibility observations to the
weather observer.
3. Notify the weather observer when the tower
observes the prevailing visibility decrease to less than
4 miles or increase to 4 miles or more.
b. Forward current weather changes to the
appropriate control facility as follows:
1. When the official weather changes to a
condition which is below 1,000-foot ceiling or below
the highest circling minimum, whichever is greater,
or less than 3 miles visibility, and when it improves
to a condition which is better than those above.
2. Changes which are classified as special
weather observations during the time that weather
conditions are below 1,000-foot ceiling or the
highest circling minimum, whichever is greater, or
less than 3 miles visibility.
c. Towers at airports where military turbo‐jet
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