Weather Services

six hours

Six hours

to all aircraft

Widespread sand or dust storms lowering visibility to less than 3 miles

ATC radar limitations and, frequency congestion may limit the controllers capability to provide this service

SIGMETs, CONVECTIVE SIGMETs, AIRMETs, Severe Weather Forecast Alerts (AWW), and Center Weather Advisories

Rain ended 42 past the hour, snow began 42 past the hour

lowest layer of clouds or obscuring phenomena aloft that is reported as broken or overcast

5,180 feet

500 feet

Sky is obscured with vertical visibility of 800 feet

At 6,000 feet; between layers; moderate turbulence; moderate rain

64 nautical miles on the 63 degree radial from Oklahoma City VOR at 1522 UTC, flight level 8,000 ft. Type of aircraft is a Cessna 172

Lines and cells of hazardous thunderstorms

compare it with the charts, reports, and forecasts of a three-dimensional picture of clouds and precipitation

Terminal Aerodrome Forecast

500 feet AGL from 270° at 50 KT

Calm

P6SM

3 knots or less

Terminal Aerodrome Forecast (TAF)

5 statute mile radius from the center of an airport runway complex

area the size of several states

At least 20 knots or stronger

809954

Light and variable; less than 5 knots

at the altitude is within 1,500 feet of the station elevation

For the 3,000-foot altitude (level) or when the level is within 2,500 feet of station elevation

True direction and knots

forecast to exist at a specific time in the future

Conditions forecast to exist at a specific time shown on the chart

that are forecast to exist at a valid time shown on the chart

Pilot weather reports (PIREPs), AIRMETs, and SIGMETs

Winds and temperatures aloft

Observed temperature, wind, and temperature/dew point spread along the proposed route can be approximated

Convective outlook

actual frontal positions, pressure patterns, temperature, dew point, wind, weather, and obstructions to vision at the valid time of the chart

It provides prospects of both general and severe thunderstorm activity during the following 24 hours

General thunderstorm activity

Unscheduled and issued as required