Order 7110.65P, Air Traffic Control, with changes

2/19/047110.65P4. When a deviation cannot be approved asrequested and the situation permits, suggest analternative course of action.b. In areas of significant weather, plan ahead andbe prepared to suggest, upon pilot request, the use ofalternative routes/altitudes.NOTE−Weather significant to the safety of aircraft includes suchconditions as tornadoes, lines of thunderstorms, embeddedthunderstorms, large hail, wind shear, microbursts,moderate to extreme turbulence (including CAT), and lightto severe icing.c. Inform any tower for which you provideapproach control services if you observe any weatherechoes on radar which might affect their operations.PHRASEOLOGY−WEATHER/CHAFF AREA BETWEEN (number)O’CLOCK AND (number) O’CLOCK (number) MILES,or(number) MILE BAND OF WEATHER/CHAFF FROM(fix or number of miles and direction from fix) TO (fix ornumber of miles and direction from fix),orLEVEL (number(s)) WEATHER ECHO BETWEEN(number) O’CLOCK AND (number) O’CLOCK, (number)MILES. MOVING (direction) AT (number) KNOTS, TOPS(altitude),orDEVIATION APPROVED, (restrictions if necessary),ADVISE WHEN ABLE TO:RETURN TO COURSE,orRESUME OWN NAVIGATIONorFLY HEADING (heading)orPROCEED DIRECT TO (name of NAVAID). UNABLEDEVIATION (state possible alternate course of action).EXAMPLE−1. “Level five weather echo between eleven o’clock andone o’clock, one zero miles. Moving east at two zero knots,tops flight level three niner zero.”2. “Level four weather echo between ten o’clock and twoo’clock, one five miles. Weather area is two five miles indiameter.”3. “Level four and five weather echoes between ten o’clockand two o’clock, one five miles. Weather area is two fivemiles in diameter.”4. “Level two through four weather echoes between teno’clock and two o’clock, one five miles. Weather area is twofive miles in diameter.”NOTE−Phraseology using level number(s) is only applicable whenthe radar weather echo intensity information is determinedby NWS radar equipment or digitized radar equipment.REFERENCE−P/CG Term− Radar Weather Echo Intensity Levels.d. The supervisory traffic management coordinator−in−charge/operationssupervisor/controller−in−charge shall verify the digitized radar weatherinformation by the best means available (e.g., pilotreports, local tower personnel, etc.) if the weatherdata displayed by digitized radar is reported asquestionable or erroneous. Errors in weather radarpresentation shall be reported to the AF technicianand the AT supervisor shall determine if the digitizedradar derived weather data is to be displayed and aNOTAM distributed.NOTE−Anomalous propagation (AP) is a natural occurrenceaffecting radar and does not in itself constitute a weathercircuit failure.2−6−5. CALM WIND CONDITIONSTERMINAL. Describe the wind as calm when thewind velocity is less than three knots.REFERENCE−FAAO 7110.65, Tailwind Components, Para 3−5−3.FAAO 7110.65, Intersecting Runway Separation, Para 3−10−4.2−6−6. REPORTING WEATHER CONDITIONSa. When the prevailing visibility at the usual pointof observation, or at the tower level, is less than4 miles, tower personnel shall take prevailingvisibility observations and apply the observations asfollows:1. Use the lower of the two observations (toweror surface) for aircraft operations.2. Forward tower visibility observations to theweather observer.Weather Information2−6−3