A winds aloft forecast of 2722, for example, would indicate 22 knots of wind from 270 degrees. 9900 means no specific direction (variable) and less than 5 knots (light). ( Pilot’s Handbook of Aeronautical Knowledge, page 12-14)
How do you read winds aloft 9900?
Codes reported as 9900 are light & variable. To convert wind directions reported greater than 360, subtract a 5 from the first number to determine wind direction and add 100 to the wind group. Example: 7508 = 250º at 108 knots. Winds greater than 200 knots are reported as 199 knots.
How high are winds aloft?
The first level for which a wind forecast is issued is 1,500 feet or more above the station elevation. Temperature is forecast for all wind levels, except the 3,000 foot level, that are 2,500 feet or more above the station.
How long is a convective Sigmet valid for?
2 hours
A convective SIGMET may be issued for any convective situation which the forecaster feels is hazardous to all categories of aircraft. Bulletins are issued hourly at Hour+55. The text of the bulletin consists of either an observation and a forecast or just a forecast. The forecast is valid for up to 2 hours.
What is the wind direction and velocity at ALB at 34000 feet?
39000 Feet
| Elev | Speed in Miles Per Hour |
|---|---|
| 24000 | 36 mph |
| 30000 | 41 mph |
| 34000 | 42 mph |
| 39000 | 65 mph |
What is a low level significant weather prognostic chart?
Low-Level Significant Weather Prognostic Chart: Provides information from the surface to FL240 (400 mbs) Altitudes from the surface to 17,999 are referenced using MSL altitudes. Altitudes from 18,000′ to FL240 are referenced using pressure altitude. Provided in two forecasts, 12 and 24 hours in 4 panels.
What is the average wind speed at 30000 feet?
For reference, the average speed of this type of aircraft at cruising altitude (around 30,000 to 35,000 feet) is 561 mph, according to TopSpeed.com.
What wind is forecast for STL at 9000 feet?
What wind is forecast for STL at 9,000 feet? 230° true at 32 knots.
How long is an Airmet valid for?
six hours
AIRMETs are valid for six hours. NOTE: The definition has changed and no longer says “light aircraft”; AIRMETs are intended for all aircraft. AIRMET TANGO (Turbulence) moderate turbulence, sustained surface winds of 30 knots or greater, and/or non convective low−level wind shear.
What is a convective SIGMET outlook?
Convective outlooks represent a time-smeared forecast for thunderstorms and describe larger geographic areas that are likely to see the issuance of one or more convective SIGMETs within the subsequent two to six hour period.
What does 9900 mean for wind aloft?
Just so, what does 9900 mean for winds aloft? 9900+10 means wind light and variable, temperature +10°.
What is wind aloft forecast?
Winds aloft, officially known as the winds and temperatures aloft forecast, is a forecast of specific atmospheric conditions in terms of wind and temperature at certain altitudes, typically measured in feet above mean sea level. The forecast is specifically used for aviation purposes. Additionally, how can wind be measured?
What is the code for wind aloft at Zulu?
Winds aloft report issued on the 14th day of the month at 1200 Zulu for use 0900 to 1500 Zulu. Temperatures are always negative above 24,000 feet (MSL). Codes reported as 9900 are light & variable. To convert wind directions reported greater than 360, subtract a 5 from the first number to determine wind direction and add 100 to the wind group.
What does +9900+10 mean on a weather map?
9900+10 means wind light and variable, temperature +10°. 7735–07 means the wind direction is from 270° (i.e., west), the wind speed is 135 knots, and the temperature is minus 7°C. WINDS AND TEMPS ALOFT FORECAST (FB)
