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Interpreting Weather Data
Jeppesen Chapter 7
66
Aviation
Professional
06/20/2013

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Cards

Term
METAR KINK 121845Z 11012G18KT 15SM SKC 25/17 A3000
METAR KBOI 121845Z 13004KT 30SM SCT150 17/6 A3015
METAR KLAX 121852Z 25004KT 6SM BR SCT007 SCT250 16/15 A2991
SPECI KMDW 121856Z 32005KT 1 ½SM RA OVC007 17/16 A2980 RMKRAB35
SPECI KJFK 121853Z 18004KT 1/2SM FG R04/2200 OVC005 20/18 A3006

Which of the reporting stations have VFR weather?
Definition
KINK, KBOI, and KLAX

AWS
Term
For aviation purposes, ceiling is defined as the height above the Earth's surface of the
Definition
lowest broke or overcast layer or vertical visibility into an obscuration.

AWS
Term
METAR KINK 121845Z 11012G18KT 15SM SKC 25/17 A3000
METAR KBOI 121845Z 13004KT 30SM SCT150 17/6 A3015
METAR KLAX 121852Z 25004KT 6SM BR SCT007 SCT250 16/15 A2991
SPECI KMDW 121856Z 32005KT 1 ½SM RA OVC007 17/16 A2980 RMKRAB35
SPECI KJFK 121853Z 18004KT 1/2SM FG R04/2200 OVC005 20/18 A3006


The wind direction and velocity at KJFK is from
Definition
180 true at 4 knots

AWS
Term
METAR KINK 121845Z 11012G18KT 15SM SKC 25/17 A3000
METAR KBOI 121845Z 13004KT 30SM SCT150 17/6 A3015
METAR KLAX 121852Z 25004KT 6SM BR SCT007 SCT250 16/15 A2991
SPECI KMDW 121856Z 32005KT 1 ½SM RA OVC007 17/16 A2980 RMKRAB35
SPECI KJFK 121853Z 18004KT 1/2SM FG R04/2200 OVC005 20/18 A3006

What are the wind conditions at Wink, Texas (KINK)
Definition
110 at 12 knots, peak gusts 18 knots.

AWS
Term
METAR KINK 121845Z 11012G18KT 15SM SKC 25/17 A3000
METAR KBOI 121845Z 13004KT 30SM SCT150 17/6 A3015
METAR KLAX 121852Z 25004KT 6SM BR SCT007 SCT250 16/15 A2991
SPECI KMDW 121856Z 32005KT 1 ½SM RA OVC007 17/16 A2980 RMKRAB35
SPECI KJFK 121853Z 18004KT 1/2SM FG R04/2200 OVC005 20/18 A3006

The remarks section for KMDW has RAB35 listed. This entry means
Definition
rain began at 1835Z

AWS
Term
METAR KINK 121845Z 11012G18KT 15SM SKC 25/17 A3000
METAR KBOI 121845Z 13004KT 30SM SCT150 17/6 A3015
METAR KLAX 121852Z 25004KT 6SM BR SCT007 SCT250 16/15 A2991
SPECI KMDW 121856Z 32005KT 1 ½SM RA OVC007 17/16 A2980 RMKRAB35
SPECI KJFK 121853Z 18004KT 1/2SM FG R04/2200 OVC005 20/18 A3006


What are the current conditions depicted for Chicago Midway Airport (KMDW)
Definition
Sky 700 ft overcase, visibility 1-1/2SM, rain.

AWS
Term
UA/OV KOKC-KTUL/TM 1800/FL120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089

The base and tops of the overcast layer reported by a pilot are
Definition
7,200 ft MSL and 8.900 ft MSL

AWS
Term
UA/OV KOKC-KTUL/TM 1800/FL120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089

The wind and temperature at 12,000 ft MSL as reported by a pilot are
Definition
080 at 21knots and -7C

AWS
Term
UA/OV KOKC-KTUL/TM 1800/FL120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089

If the terrain elevation is 1,295 ft MSL, what is the height above ground level of the base of the ceiling?
Definition
505 ft AGL

AWS
Term
UA/OV KOKC-KTUL/TM 1800/FL120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089

The intensity of the turbulence reported at a specific altitude is
Definition
light from 5,500 ft to 7,200 ft
AWS
Term
UA/OV KOKC-KTUL/TM 1800/FL120/TP BE90//SK BKN018-TOP055/OVC072-TOP089/CLR ABV/TA M7/WV 08021/TB LGT 055-072/IC LGT-MOD RIME 072-089

The intensity and type of icing reported by a pilot is
Definition
light to moderate rime.

AWS
Term
From which primary source should information be obtained regarding expected weather at the estimated time of arrival if your destination has no Terminal Forecast?
Definition
Area Forecast

AWS
Term
KMEM 121720Z 121818 20012KT 5SM HZ BKN030 PROB40 2022 1SM TSRA OVC008CB FM2200 33015G20KT P6SM BKN015 OVC025 PROB40 2202 3SM SHRA FM0200 35012KT OVC008 PROB40 0205 2SM -RASN BECMG 0608 02008KT BKN012 BECMG 1012 00000KT 3SM BR SKC TEMPO 1214 1/2SM FG FM1600 VRB06KT P6SM SKC=

What is the valid period for the TAF for KMEM?
Definition
1800Z TO 1800Z

AWS
Term
KMEM 121720Z 121818 20012KT 5SM HZ BKN030 PROB40 2022 1SM TSRA OVC008CB FM2200 33015G20KT P6SM BKN015 OVC025 PROB40 2202 3SM SHRA FM0200 35012KT OVC008 PROB40 0205 2SM -RASN BECMG 0608 02008KT BKN012 BECMG 1012 00000KT 3SM BR SKC TEMPO 1214 1/2SM FG FM1600 VRB06KT P6SM SKC=

In the TAF for KMEM, what does "SHRA" stand for?
Definition
Rain showers.

AWS
Term
KMEM 121720Z 121818 20012KT 5SM HZ BKN030 PROB40 2022 1SM TSRA OVC008CB FM2200 33015G20KT P6SM BKN015 OVC025 PROB40 2202 3SM SHRA FM0200 35012KT OVC008 PROB40 0205 2SM -RASN BECMG 0608 02008KT BKN012 BECMG 1012 00000KT 3SM BR SKC TEMPO 1214 1/2SM FG FM1600 VRB06KT P6SM SKC=

Between 1000Z and 1200Z the visibility at KMEM is forecast to be
Definition
3 statue miles

AWS
Term
KMEM 121720Z 121818 20012KT 5SM HZ BKN030 PROB40 2022 1SM TSRA OVC008CB FM2200 33015G20KT P6SM BKN015 OVC025 PROB40 2202 3SM SHRA FM0200 35012KT OVC008 PROB40 0205 2SM -RASN BECMG 0608 02008KT BKN012 BECMG 1012 00000KT 3SM BR SKC TEMPO 1214 1/2SM FG FM1600 VRB06KT P6SM SKC=

What is the forecast wind for KMEM from 1600Z until the end of the forecast?
Definition
Variable in direction at 6 knots.

AWS
Term
KOKC 051130Z 051212 14008KT 5SM BR BKN030 TEMPO 1316 1 1/2SM BR FM1600 18010KT P6SM SKC BECMG 2224 20013G20KT 4SM SHRA OVC020 PROB40 0006 2SM TSRA OVC008CB BECMG 0608 21015KT P6SM SCT040=

In the TAF form KOKC, the "FM Group" is forecast for the hours from 1600Z to 2200Z with the wind from
Definition
180 at 10 knots.

AWS
Term
KOKC 051130Z 051212 14008KT 5SM BR BKN030 TEMPO 1316 1 1/2SM BR FM1600 18010KT P6SM SKC BECMG 2224 20013G20KT 4SM SHRA OVC020 PROB40 0006 2SM TSRA OVC008CB BECMG 0608 21015KT P6SM SCT040=

In the TAF from KOKC, the clear sky becomes
Definition
overcast at 2,000 ft during the forecast period 2200Z and 2400Z.

AWS
Term
KOKC 051130Z 051212 14008KT 5SM BR BKN030 TEMPO 1316 1 1/2SM BR FM1600 18010KT P6SM SKC BECMG 2224 20013G20KT 4SM SHRA OVC020 PROB40 0006 2SM TSRA OVC008CB BECMG 0608 21015KT P6SM SCT040=

During the time period from 0600Z and 0800Z, what visibility is forecast for KOKC?
Definition
Greater than 6 statute miles.

AWS
Term
The only cloud type forecast in TAF reports is
Definition
Cumulonimbus

AWS
Term
To best determine general forecast weather conditions over several states, the pilot should refer to
Definition
Aviation Area Forecasts.

AWS
Term
(Refer to figure 16)
What is the outlook for the southern half of Indiana after 0700Z?
Definition
VFR

AWS
Term
To determine the freezing level and areas of probably icing aloft, the pilot should refer to the
Definition
Inflight Aviation Weather Advisories

AWS
Term
The section of the Area Forecast entitled "VFR CLDS/WX" contains a general description of
Definition
clouds and weather which cover an area greater than 3,000 square miles and is significant to VFR flight operations.

AWS
Term
(Refer to figure 16)
What sky condition and visibility are forecast for upper Michigan in the eastern portions after 2300Z?
Definition
Ceiling 1,000 ft overcast and 3 to 5 statute miles visibility.

AWS
Term
(Refer to figure 16)
The Chicago FA forecast section is valid until the twenty-fifth at
Definition
0800Z

AWS
Term
(Refer to figure 16)
What sky condition and type obstructions to vision are forecast for upper Michigan in the western portions from 0200Z until 0500Z?
Definition
Ceiling becoming 1,000 ft overcast with visibility 3 to 5 statue miles in mist.

AWS
Term
What is indicated when a current CONVECTIVE SIGMET forecasts thunderstorms?
Definition
Thunderstorms obscured by massive cloud layers.

AIM
Term
What information is contained in a CONVECTIVE SIGMET?
Definition
Tornadoes, embedded thunderstorms, and hail 3/4 inch or greater in diameter.

AIM
Term
SIGMET's are issued as a warning of weather conditions hazardous to which aircraft?
Definition
All aircraft.

AWS
Term
Which in-flight advisory would contain information on severe icing not associated with thunderstorms?
Definition
SIGMET

AWS
Term
AIRMET's are advisories of significant weather phenomena but of lower intensities than SIGMETs and are intended for dissemination to
Definition
all pilots.

AWS
Term
(Refer to figure 17)
What wind is forecast for STL at 9,000 ft?
Definition
230 true at 32 knots

AWS
Term
What values are used for Winds Aloft Forecasts?
Definition
True direction and knots.

AWS
Term
When the term "light and variable" is used in reference to a Winds Aloft Forecast, the coded group and windspeed is
Definition
9900 and less than 5 knots.

AWS
Term
(Refer to figure 18)
What is the status of the front that extends from Nebraska through the upper peninsula of Michigan?
Definition
Cold

AWS
Term
(Refer to figure 18)
The IFR weather in Northern Texas is due to
Definition
low ceilings.

AWS
Term
(Refer to figure 18)
Of what value is the Weather Depiction Chart to the pilot?
Definition
For determining general weather conditions on which to base flight planning.

AWS
Term
(Refer to figure 18)
The marginal weather in central Kentucky is due to low
Definition
ceiling

AWS
Term
(Refer to figure 18)
What weather phenomenon is causing IFR conditions in central Oklahoma?
Definition
Low ceilings and visibility.

AWS
Term
(Refer to figure 18)
According to the Weather Depiction Chart, the weather for a flight from southern Michigan to north Indiana is ceilings
Definition
greater than 3,000 ft and visibility greater than 5 miles.

AWS
Term
Radar weather reports are of special interest to pilots because they indicate
Definition
location of precipitation along with type, intensity, and cell movement of precipitation.

AWS
Term
What information is provided by the Radar Summary Chart that is not shown on other weather charts?
Definition
Lines and cells of hazardous thunderstorms.

AWS
Term
(Refer to figure 19)
(Area B) What is the top for precipitation of the radar return?
Definition
24,000 ft MSL

AWS
Term
(Refer to figure 19)
(Area D) What is the direction and speed of movement of the cell?
Definition
North at 17 knots

AWS
Term
(Refer to figure 19)
(Area E) The top of the precipitation of the cell is
Definition
16,000 ft MSL

AWS
Term
What does the heavy dashed line that forms a large rectangular box on a radar summary chart refer to?
Definition
Severe weather watch area.

AWS
Term
(Refer to figure 20)
How are Significant Weather Prognostic Charts best used by a pilot?
Definition
For determining areas to avoid (freezing levels and turbulence)

AWS
Term
(Refer to figure 20)
Interpret the weather symbol depicted in Utah on the 12-hour Significant Weather Prognostic Chart.
Definition
Moderate turbulence, surface to 18,000 ft.

AWS
Term
(Refer to figure 20)
What weather is forecast for the Florida area just ahead of the stationary front during the first 12 hours?
Definition
Ceiling 1,000 to 3,000 ft and/or visibility 3 to 5 miles with continuous precipitation.

AWS
Term
(Refer to figure 20)
The enclosed shaded area associated with the low pressure system over northern UTah is forecast to have
Definition
continuous snow.

AWS
Term
(Refer to figure 20)
At what altitude is the freezing level over the middle of Florida on the 12-hour Significant Weather Prognostic Chart?
Definition
12,000 ft.

AWS
Term
Individual forecasts for specific routes of flight can be obtained form which weather source?
Definition
Transcribed Weather Broadcasts (TWEBs)

AWS
Term
Transcribed Weather Broadcasts (TWEBs) may be monitored by tuning the appropriate radio receiver to certain
Definition
VOR and NDB frequencies.

AWS
Term
When telephoning a weather briefing for the planned flight, the pilot should request
Definition
a standard briefing.

AIM
Term
Which type of weather briefing should a pilot request, when departing within the hour, if no preliminary weather information has been received?
Definition
Standard briefing.

AIM
Term
Which type of weather briefing should a pilot request to supplement mass disseminated data?
Definition
An abbreviated briefing.

AIM
Term
To update a previous weather briefing, a pilot should request
Definition
aan abbreviated briefing.

AIM
Term
A weather briefing that is provided when the information requested is 6 or more hours in advance of the proposed departure time is
Definition
an outlook briefing.

AIM
Term
When requesting weather information for the following morning, a pilot should request
Definition
an outlook briefing.

AIM
Term
To obtain a continuous transcribed weather briefing, including winds aloft and route forecasts for a cross-country flight, a pilot should monitor a
Definition
Transcribed Weather Broadcast (TWEB) on an NDB or a VOR facility.

AIM
Term
What should pilots state initially when telephoning a weather briefing facility for preflight weather information?
Definition
Identify themselves as pilots.

AWS
Term
When telephoning a weather briefing facility for preflight weather information, pilots should state
Definition
whether they intend to fly VFR only.

AWS
Term
How should contact be established with an En Route Flight Advisory Service (EFAS) station, and what service would be expected?
Definition
Call Flight Watch on 122.0 for information regarding actual weather and thunderstorm activity along proposed route.

AWS
Term
What service should a pilot normally expect from an En Route Flight Advisory Service (EFAS) station?
Definition
Actual weather information and thunderstorm activity along the route.

AWS
Term
Below FL180, en route weather advisories should be obtained from an FSS on
Definition
122.0 MHz

AIM
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