The shaded area indicates IFR. In this case, the filled station model in central Oklahoma indicates overcast sky and the "3" below the model indicates 300-foot ceiling. The "2-1/2" to the left of the model indicates IFR visibility of 2-1/2 statute miles.
Low visibility only
Heavy rain Showers
Low Ceilings and visibility
There are no shaded or contoured areas along this route. This indicates VFR areas with a ceiling greater than 3,000 feet and a visibility greater than 5 miles.
greater than 3,000 feet and visibility greater than 5 miles
1,000 to 3,000 feet and/or visibility 3 to 5 miles
less than 1,000 feet and/or visibility less than 3 miles
Radar weather reports show areas of precipitation; type, such as rain showers; intensity, such as light or heavy; and azimuth of movement. Intensity trend is no longer coded on the Radar Weather Report.
location of precipitation along with type, intensity, and cell movement of precipitation
large areas of low ceilings and fog
location of precipitation along with type, intensity, and trend
Individual thunderstorm cells as well as lines of thunderstorms are depicted on radar summary charts. Since the radar returns are reflected off precipitation, not clouds, they do not show ceilings or types of clouds.
Ceilings and precipitation between reporting stations
Lines and cells of hazardous thunderstorms
Types of clouds between reporting stations
240 indicates the highest precipitation top in the area in hundreds of feet above mean sea level, which in this case is 24,000 feet MSL.
24,000 feet MSL
24,000 feet AGL
2,400 feet MSL
Cell movement is indicated by an arrow pointing north and a number (17) indicating speed in knots.
North at 17 knots
South at 17 knots
North at 17 MPH
160 indicates the highest precipitation top in the area in hundreds of feet above mean sea level, which in this case is 16,000 feet MSL.
25,000 feet MSL
16,000 feet MSL
16,000 feet AGL
Severe weather watch areas are outlined by heavy dashed lines, usually in the form of a large rectangular box. The watch number, if any, is also printed at the bottom of the chart together with the issuance time and expiration time.
Areas of heavy rain
Severe weather watch area
Areas of hail 1/4 inch in diameter
In addition to outlining areas of instrument flight rule (IFR) and marginal visual flight rule (MVFR) weather, these charts include freezing levels and areas of turbulence. Since the significant weather panels are valid from the surface up to 24,000 fee
For determining areas to avoid (freezing levels and turbulence)
For analyzing current frontal activity and cloud coverage
For overall planning at all altitudes
On the upper left panel, the symbol indicates moderate turbulence. The notation 180/ means the turbulence is from the surface up to 18,000 feet.
Base of clear air turbulence, 18,000 feet
Thunderstorm tops at 18,000 feet
Moderate turbulence, surface to 18,000 feet
The upper left panel indicates ceiling 1,000-3,000 feet and/or a visibility of 3-5 miles. This is marginal VFR (MVFR). The dot symbols in the shaded area within the lower left panel indicates continuous rain.
Ceiling less than 1,000 feet and/or visibility less than 3 miles with continuous precipitation
Ceiling 1,000 to 3,000 feet and/or visibility 3 to 5 miles with continuous precipitation
Ceiling 1,000 to 3,000 feet and/or visibility 3 to 5 miles with intermittent precipitation
The area is shaded, indicating continuous precipitation. Two snow symbols (**) indicate that this precipitation is continuous snow.
continuous snow showers
The upper left panel contains a dashed green line marked with the number 120, which crosses central Florida. This represents the height of the 12,000-ft. freezing level.
The information in a transcribed weather broadcast (TWEB) varies, but generally it contains route-oriented data.
Transcribed Weather Broadcasts (TWEBs)
TWEB's are broadcast over certain VOR and NOB frequencies. Airport advisory frequencies are used by an FSS at uncontrolled airports to provide general airport information to pilots. Automatic terminal information service (ATIS) frequencies are used to bro
airport advisory frequencies
VOR and NDB frequencies
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