1Refer to the excerpt from the following METAR report: KTUS 08004KT 4SM HZ 26/04 A2995 RMK RAE36, at approximately what altitude AGL should bases of convective-type cumuliform clouds be expected
8,800 feet.
2The remarks section of an aviation routine weather report (METAR) contains the following coded information - what does it mean: KORD 21135Z 01006KTS 10SM OV0260 M03/M08 A3030 RMK FZDZB42 WSHIFT 30 FROPA
Freezing drizzle began at 42 after the hour and wind shift occurred at 30 after the hour due to a frontal passage.
3A common location of clear air turbulence is
In an upper trough on the polar side of a jet stream.
4Advection fog has drifted over a coastal airport during the day - What may tend to dissipate or lift this frog into low stratus clouds
Wind 15 kts or strangers.
5Advection fog in coastal areas is most commonly caused by
Warm, moist air passing over a cool surface.
6A moist, unstable air mass is characterized by
Cumuliform clouds and showery precipitation.
7A pilot reporting turbulence that momentarily causes slight, erratic changes in altitude and/or attitude should report is as
Light Turbulence.
8A situation most conducive to the formation of advection fog is
An air mass moving inland from the coastline during the winter.
9A strong wind shear can be expected
On the low-pressure side of a jetstream core where the speed at the core is stronger than 110 knots.
10A supercell thunderstorm is near your destination airport - you should be aware that these storms
May remain for several hours.
11As you approach an airport to land, you observe convective clouds over the airport with virga below - this could indicate
The presence of a microburst.
12A temperature inversion is a layer which
Temperature increases with altitude.
13Convective currents are most active on warm summer afternoons when winds are
Light.
14Dashed lines on a surface analysis chart, if depicted, indicate that the pressure gradient is
Weak.
15During an approach, the most important and most easily recognized means of being alerted to possible wind shear is monitoring the
Power and vertical velocity required to remain on the proper glidepath.
16During departure, under conditions of suspected low-level wind shear, a sudden decrease in headwind will cause
A loss in airspeed equal to the decrease in wind velocity.
17During flight, there is a close temperature dewpoint spread - what weather phenomenon can you expect
Fog.
18During prefligh preparation, weather report forecasts which are not routinely available at the local service outlet (AFSS) can best be obtained by means of contacting
Weather forecast office (WFO).
19During the life cycle of a thunderstorm, which stage is characterized predominantly by downdrafts
Dissipating.
20During the winter months in the middle latitudes, the jet streams shift toward the
South and speed increases.
21Fog produced by frontal activity is a result of saturation due to
Evaporation of precipitation.
22For smooth air operations on a warm, sunny day, and scattered cumulus clouds are above your altitude, you should
Climb to a higher altitude that is above the cumulus clouds.
23From which measurement of the atmosphere can stability be determined
The ambient lapse rate.
24From which of the following can the observed temperature, wind, and temperature/dewpoint spread be determined at a specified altitude
Constant Pressure Analysis Charts.
25Frost covering the upper surface of an airplane wing usually will cause
The airplane to stall at an angle of attack that is lower than normal.
26Frost is a hazard to aircraft because
It disrupts airflow over the wing.
27Hail is most likely to be associated with
Cumulonimbus clouds.
28Hatching on a constant pressure analysis chart indicates
Windspeed 70 knots to 110 knots.
29Hazardous wind shear is commonly encountered
In areas of temperature inversion and near thunderstorms.
30How long is the forecast of a convective SIGMET valid for
2 Hours.
31Ice pellets encountered during flight are normally evidence that
Freezing rain exists at higher altitudes.
32Ice pellets encountered during flight normally are evidence that
A warm front is about to pass.
33If airborne radar is indicating an extremely intense thunderstorm echo, this thunderstorm should be avoided by a distance of at least
20 miles.
34If a surface-based temperature inversion is being reported at your departure airport, you can expect
Low level wind shear.
35If a temperature inversion is encountered immediately after takeoff or during an approach to a landing, a potential hazard exists due to
Wind shear.
36If clouds form as a result of very stable, moist air being forced to ascend a mountain slope, the clouds will be
Stratus type with little vertical development and little or no turbulence.
37If ice pellets are falling while you are performing your preflight inspection, what does this indicate
An inversion is taking place.
38If the temperature lapse rate decreases, what happens to the stability of the air
Stability increases.
39If the temperature lapse rate increases, what happens to the stability of the air
Stability decreases.
40If you find yourself in convective weather with severe turbulence, you should
Slow below maneuvering speed (Va) or manufacturer's recommended turbulence airspeed, maintain wings level, and accept airspeed and altitude deviations.
41In a situation where warm, moist air moves into a cold, dry inland area, what may result
Formation of fog.
42In-flight Aviation Weather Advisories include what type of information
Forecasts for potentially hazardous flying conditions for enroute aircraft.
43In the northern hemisphere, the wind is deflected to the
Right by Coriolis force.
44In the northern hemisphere, how does air move from an area of high pressure to an area of low pressure
It moves clockwise, outward, and downward manner into an area of rising low pressure.
45In what ways do advection fog, radiation fog, and steam fog differ in their formation and location
Radiation fog is restricted to land areas; advection fog is most common song coastal areas; steam fog forms over a water surface.
46Jet streams are bands of strong wind
In the upper levels of the atmosphere.
47Large changes in attitude and altitude, changes in airspeed, and momentary loss of control is reported as
Severe turbulence.
48Low-level wind shear may occur when
There is a low-level temperature inversion with strong winds above the inversion.
49Moisture is added to air by
Evaporation and sublimation.
50Of the following, which is accurate regarding turbulence associated with thunderstorms
Outside the cloud, shear turbulence can be encountered 20 miles laterally from a severe storm.
51On a flight from east to west in the northern hemisphere, where a high pressure system exists north of your route, the most favorable winds would exist
To the south of the high pressure system.
52On a Surface Analysis Chart, the solid lines that depict sea level pressure patterns are called
Isobars.
53On a surface analysis chart close spacing of the isobars indicates
Strong pressure gradient.
54One of the most dangerous features of mountain waves is the turbulent areas in and
Below rotor clouds.
55On your route you see cumulus buildups with heavy rain shafts close to your destination airport - You should
Consider diverting.
56Select the true statement pertaining to the life cycle of a thunderstorm
The beginning of rain at the earth's surface indicates the mature stage of the thunderstorm.
57SIGMET's are issued as a warning of weather conditions which are hazardous
to all aircraft.
58Standard Temperature at sea level is
15 C.
59Terminal Aerodrome Forecasts (TAFs) are issued how many times a day and cover what period of time
Four times daily and are usually valid for a 24 hour period.
60The Aviation Weather Center (AWC) prepares FA's for the contiguous US
Three times each day.
61The conditions necessary for the formation of cumulonimbus clouds are a lifting action and
Unstable, moist air.
62The conditions necessary for the formation of stratiform clouds are a lifting action and
Stable, moist air.
63The difference found by subtracting the temperature of a parcel of air theoretically lifted from the surface to 500 millibars and the existing temperature at 500 millibars is called the
Lifted Index.
64The formation of either predominantly stratiform or predominantly cumuliform clouds is dependent upon the
Stability of the air being lifted.
65The general circulation of air associated with a high-pressure area in the northern hemisphere is
Outward, downward, and clockwise.
66The jet stream and associated clear air turbulence can sometimes be visually identified in flight by
Long streaks of cirrus clouds.
67The low level wind shear alert system (LLWAS) provides wind data and software process to detect the presence of a
Change in wind direction and/or speed within a very short distance above the airport.
68The minimum vertical wind shear value critical for probable moderate or greater turbulence is
6 knots per 1,000 feet.
69The most current en route and destination weather information for an instrument flight should be obtained from the
AFSS.
70The most dangerous hazards operating in the vicinity of thunderstorms are
Hail and turbulence.
71The most severe weather conditions, such as destructive winds, heavy hail, and tornadoes, are generally associated with
Squall lines.
72The national convective weather forecast is a supplement to, but does not substitute for, the report and forecast information contained in
Convective SIGMETs.
73The national convective weather forecast provides forecasts for
The United States only.
74The presence of standing lenticular altocumulus clouds is a good indication of
Very strong turbulence.
75There is a squall line along the route on your cross-country flight - what do you expect
Turbulence and heavy rain.
76The section of the Aviation Area Forecast (FA) entitled VFR clouds and Weather contains a summary of
Sky conditions, cloud heights, visibility, obstructions to vision, precipitation, and sustained surface winds of 20 knots or greater.
77The standard temperature lapse rate below the tropopause
Remains the same at all altitudes.
78The strength and location of the jet stream is normally
Weaker and farther north in the summer.
79The surface analysis chart depicts
Actual frontal positions, pressure patterns, temperature, dewpoint, wind, weather, and obstructions to vision at the valid time of the chart.
80The telephone information briefing service (TIBS) provided by AFSSs include
Continuous recording of meteorological and/or aeronautical information available by telephone.
81The US High-Level Significant Weather Prognostic Chart forecasts significant weather for what airspace
25,000 feet to 63,000 feet.
82The visibility in a Terminal Aerodrome Forecast (TAF) of P6SM implies that the prevailing visibility is expected to be greater than
6 Statute Miles.
83The weather forecast for the next morning at a coastal airport includes temperature 16 C, dewpoint 16 C and wind 180 at 10 knots - What weather is expected
Foggy, with fog intensifying until wind increases above 15 knots.
84The wind system associated with a low-pressure area in the northern hemisphere is
A cyclone and is caused by Coriolis force.
85To best determine observed weather conditions between weather reporting stations, the pilot should refer to
Pilot reports.
86To determine the pressure altitude prior to takeoff, the altimeter should be set to
29.92" and the altimeter indication noted.
87Turbulence that is encountered above 15,000 feet AGL not associated with cumuliform cloudiness, including thunderstorms, should be reported as
Clear Air turbulence.
88Virga is best described as
Streamers of precipitation trailing beneath clouds evaporate before reaching the ground.
89Weather Advisory Broadcasts, including severe forecast alerts (AWW), convective SIGMETs, and SIGMETs, are provided by
Air Route Traffic Control Center (ARTCC).
90Weather reports indicate that there is a high moisture content, higher than normal lapse rate, and turbulent conditions - Which type of weather can you expect
Thunderstorm activity and unstable air.
91What are some weather indications of the imminent passage of a cold front
High dew point, falling barometric pressure.
92What are the characteristics of stable air
Poor visibility; steady precipitation; stratus clouds.
93What are the stages in the life cycle of a thunderstorm
Cumulus stage, mature stage, and dissipating stage.
94What are the winds forecast at 6,000 feet MSL - MKC — 3000: 9900 - 6000: 2425+07 - 9000: 2435+05
240 true at 25 knots.
95What causes wind
Pressure differences.
96What conditions are indicated by this SIGMET - SIGMET ROMEO 2 VALID UNTIL 100530 OR WA FROM SEA TO PDT TO EUG TO SEA OCNL SEV CAT BTN FL280 AND FL350 EXPCD DUE TO JTSTR CONDS BEGNG AFT 0200Z CONTG BYD 0530Z
Occasional severe clear air turbulence between FL 280 and FL 350.
97What conditions are specified by the following special weather report (SPECI) — SPECI KFSD 092054Z 32005KT 1 SM RA BR OVC007 17/16 A2990 RMK RAB31
Visibility 1 SM in rain and mist, rain began at 2031Z.
98What conditions can be expected at this coastal town - METAR KTIX 110953Z 10004KT ¼SM OVC015 17/17 A2973 RMK A02 TAF KTIX 111030Z 1112/1212 11010G15KT 1/2SM BKN010 FM 112000 11010G15 1/4SM SCT015
Low visibility and fog increases with winds no greater than 15 knots.
99What conditions cause an unstable air mass
High humidity and high temperature.
100What conditions cause a stable air mass
Lower humidity and cooler temperatures.
101What determines the structure or type of clouds which will form as a result of air being forced to ascend
The stability of the air before lifting occurs.
102What does the contraction VRB in the Terminal Aerodrome Forecast (TAF) mean
Wind direction is variable.
103What feature is normally associated with the cumulus stage of a thunderstorm
Continuous updraft.
104What flight planning information can a pilot derive from constant pressure analysis charts
Winds and temperatures aloft.
105What is a characteristic of stable air
Stratiform clouds.
106What is an important characteristic of wind shear
It can be present at any level and can exist in both a horizontal and vertical direction.
107What is indicated if ice pellets are encountered at 8,000'
Freezing rain at higher altitude.
108What is meant by the special METAR weather observation for KBOI - SPECI KBOI 091854Z 32005KT 1 ½SM RA BR OV007 17/16 A2990 RMK RAB12
Rain and mist obstructing visibility; rain began at 1812Z.
109What is the approximate base of the cumulus clouds if the temperature at 2,000' MSL is 10 C and the dewpoint is 1 C
6,000' MSL.
110What is the flight visibility submitted in the following PIREP - UA/OV SUX 18025/TM1340/TP PA34/SK OVC 025/WX FV04SM RA HZ/WV 23015KT/TB LGT/RM LGT RAIN
4 statute miles, rain, haze.
111What is the forecast in the following TAF - KALO 201132Z 2012/2112 VRB05KT P6SM BKN110
Wind direction is variable throughout the valid period in the TAF.
112What is the meaning of the terms PROB40 2102 +TSra as used in a Terminal Aerodrome Forecasts (TAF)
Between 2100Z and 0200Z there is a forty percent (40%) probability of thunderstorms with heavy rain.
113What is the sky condition submitted in the following PIREP - UA/OV SUX 18025/ TM1340/TP PA34/SK OVC025 TOP45 BKN073 TOP085 SKC/TB LGT
Base of overcast 2,500 MSL with tops at 4,500 MSL, broken 7,300 MSL with tops at 8,500 MSL, sky clear above 8,500 MSL.
114What is the standard temperature at 10,000'
-5 C.
115What is the standard temperature at 20,000'
-25 C.
116What is the upper limit of the Low Level Prognostic Chart
24,000 feet.
117What is the valid period for the following TAF - KSUX 111130Z 1112/1212 23012G20KT P6SM OVC080
1200Z on the 11th day of the month to 1200Z on the 12th day of the month.
118What lifts advection fog into low stratus clouds
Surface winds of approximately 15 kts or stronger.
119What minimum distance should exist between intense radar echoes before any attempt is made to fly between these thunderstorms
40 miles.
120What prevents air from flowing directly from high-pressure areas to low-pressure areas
Coriolis force.
121What significant cloud coverage is reported by this pilot report - KMOB UA/OV 15NW MOB 1340Z/SK OVC 025/045 OVC 090
The top of the lower overcast is 2,500 feet; base and top of second overcast layer is 4,500 and 9,000 feet, respectively.
122What single reference contains information regarding expected volcanic eruption, that is occurring or is expected to occur
In-Flight Weather Advisories.
123What type of air mass would be expected when smoke, dust, haze and low visibility are present
Stable air mass.
124What type of inflight weather advisories provides an en route pilot with information regarding the possibility of moderate icing, moderate turbulence, winds of 30 knots or more at the surface and extensive mountain obscurement
AIRMETs and Center Weather Advisories (CWA).
125What type of weather would you expect when you have unstable air, lifting action, and water vapor
Thunderstorm activity.
126What type weather can one expect from moist, unstable, and very warm surface temperatures
Strong updrafts and cumulonimbus clouds.
127What values are used for Winds Aloft Forecasts
True direction and knots.
128What visible signs indicate extreme turbulence in thunderstorms
Cumulonimbus clouds, very frequent lightning, and roll clouds.
129What was the location of the aircraft when the pilot submitted the following PIREP - UA/OV SUX 18025/TM1340/TP PA34/SL OVC 025/WX FV04SM RA HZ/WV 23015KT/TB LGT/RM LGT RAIN
25NM south on the 180 degree radial from the SUX VOR.
130What weather conditions are indicated by the TAF shown below - 15005KT 5SM HZ FEW020 WS010/31022KT
Wind shear is reported at 1,000 feet AGL from 310 at 22 knots.
131What weather conditions are indicated by the terminal aerodrome forecast (TAF) shown below - FM01200 18015KT P6sm SCT050 PROB30 0121/0211 1SM +TSRA
30% chance of thunderstorms, heavy rain, and 1 statute mile visibility.
132What weather conditions can be expected with a warm front in the summer months
Cumulus build-ups and thunderstorms.
133What weather phenomena can be expected before the passage of an occluded front
Precipitation and poor visibility.
134What weather phenomenon is depicted by bold green arrows on a US Mid-level significant Weather Prognostic Chart
Jet Stream Axis.
135What weather phenomenon is implied within an area enclosed by bold yellow dashed lines in the US High-Level Significant Weather Prognostic Chart
Moderate or Severe Turbulence.
136What weather phenomenon is implied within an area enclosed by red scalloped lines on a US High-Level Significant Weather Prognostic Chart
Moderate or severe icing.
137What weather phenomenon often spawns tornadoes
Squall lines.
138What wind conditions would you anticipate when squall lines are reported at your destination
Sudden increases in wind speed of at least 16 knots to a sustained speed of 22 knots or more for at least 1 minute.
139When an air mass is stable, which of these conditions are most likely to exist
Smoke, dust, haze, etc, concentrated at the lower levels with resulting poor visibility.
140When and where is the jet stream the strongest
Northern and Southern Hemispheres winter.
141When are thunderstorms forecast - KOKC 181133Z 1812/19212 17012G18KT P6SM OVC015 TEMPO 1812/1815 BKN200 FM181500 18014G22KT P6SM BKN025 FM181800 18014G22KT P6SM SCT040 PROB30 1823/1903 P6SM TSRA BKN040CB FM190800 17012G18KT P6SM OVC015
Between 2300 and 0300Z.
142When conditionally unstable air with high-moisture content and very warm surface temperature is forecast, one can expect what type of weather
Strong updrafts and cumulonimbus clouds.
143When flying in a mountainous area on a cool, clear night with little wind and moist air, what would you expect
Fog forming in low-lying or valley areas.
144When flying into a low-pressure area in the northern hemisphere, the wind direction and velocity will be from the
Left and decreasing.
145When flying low over hilly terrain, ridges, or mountain ranges, the greatest potential danger from turbulent air currents will usually be encountered on the
Downwind side when flying into the wind.
146When flying over a mountain range, when would you encounter the strongest turbulent downdraft
Downwind of the mountain range.
147When flying over a mountain range with turbulence, mountain waves cause downdrafts on the
Crest and downwind of the mountain range for hundreds of miles.
148When precipitation falls through air that is more than 0 C into air that is less than 0 C, what weather conditions can you expect
Freezing precipitation.
149When total sky cover is few or scattered, the height shown on the Weather Depiction Chart is the
Base of the lowest layer.
150When turbulence causes changes in altitude and/or attitude, but aircraft control remains positive, that should be reported as
Moderate.
151Where are you most likely to encounter clear air turbulence (CAT)
Between 20,000 feet and 50,000 feet in a cloud-free area.
152Where is the strongest turbulence in the jet stream found
On the polar side of the axis due to the greatest decrease in wind speed.
153Which are characteristics of a cold mass moving over a warm surface
Cumuliform clouds, turbulence, and good visibility.
154Which chart provides a ready means of locating observed frontal position and pressure centers
Surface Analysis Chart.
155Which cloud types would indicate convective turbulence
Towering cumulus clouds.
156Which combination of weather-producing variables would likely result in cumuliform-type clouds, good visibility, and showery rain
Unstable, moist air and orographic lifting.
157Which conditions are favorable for the formation of a surface-based temperature inversion
Clear, cool nights with calm or light wind.
158Which correctly describes the purpose of Convective SIGMET's (WST)
The consist of either an observation and a forecast or just a forecast for tornadoes, significant thunderstorm activity, or hail greater than or equal to ¾ inch in diameter.
159Which feature is associated with the tropopause
Abrupt change in temperature lapse rate.
160Which forecast provides specific information concerning expected sky cover, cloud tops, visibility, weather, and obstructions to vision in a route format
Area Forecast.
161Which in-flight hazard is most commonly associated with warm fronts
Precipitation-induced fog.
162Which information section is contained in the Aviation Area Forecast (FA)
VFR Clouds and weather (VFR CLDS/WX).
163Which is a characteristic of stable air
Restricted visibility.
164Which is a danger of a gust front associated with a thunderstorm
Low level wind shear.
165Which is a direct cause of atmospheric circulation
Heat Exchange.
166Which is true concerning the radar weather report (SD) for KOKC - KOKC 1934 LN 8TRW++/+ 86/40 164/60 199/115 15W C2425 MT 570 AT 159/65 2 INCH HAIL RPRTD THIS CELL
The maximum tops of the cells is 57,000 feet located 65NM southeast of the station.
167Which is true regarding a cold front occlusion - The air ahead of the warm front
Is warmer than the air behind the overtaking cold front.
168Which is true regarding actual air temperature and dewpoint temperature spread - The temperature spread
Decreases as the relative humidity increases.
169Which is true regarding high or low-pressure systems
A low-pressure area or through is an area of rising air.
170Which is true regarding the use of airborne weather-avoidance radar for the recognition of certain weather conditions
The radarscope provides no assurance of avoiding instrument weather conditions.
171Which is true with respect to a high- or low-pressure system
A high-pressure area or ridge is an area of descending air.
172Which kind of wind shear is most hazardous
Convective wind shear.
173Which provides a graphic display of both VFR and IFR weather
Weather depiction chart.
174Which situation would most likely result in freezing precipitation - rain falling from air which has a temperature of
More than 0 C into air having a temperature of 0 C or less.
175Which statement is true concerning squall lines
They offer the most intense weather hazards to aircraft.
176Which statement is true concerning the hazards of hail
Hailstones may be encountered in clear air several miles from a thunderstorm.
177Which statement is true regarding squall lines
They are nonfrontal and often contain severe, steady-state thunderstorms.
178Which statement pertaining to the following Terminal Aerodrome Forecast (TAF) is true - TAF KMEM 091135Z 0915 15005KT 5SM HZ BKN060 FM1600 VRB04KT P6SM SKC
SKC in the valid period indicates no significant weather and sky clear.
179Which type of jetstream can be expected to cause the greater turbulence
A curving jetstream associated with a deep low-pressure trough.
180Which is a characteristic typical of a stable air mass
Continuous precipitation.
181Which weather chart depicts conditions forecast to exist at a specific time in the future
12 Hour Significant Weather Prognostication Chart.
182Which weather phenomenon signals the beginning of the mature stage of a thunderstorm
The start of rain.
183Which weather product contains non-convective weather information potentially hazardous to all aircraft
SIGMETs.
184Which would decrease the stability of an air mass
Moist, warm air.
185Which would increase the stability of an air mass
Cooling from below.
186While enroute at 17,500 feet MSL, how should you report turbulence with the following characteristics - Proximity to cumuliform clouds: none - Aircraft reaction: changes in altitude occur but aircraft remains in positive control - Reaction inside the aircraft: occupants feel definite strain against seatbelts
Moderate CAT.
187While flying cross-country in the northern hemisphere, you experience a continuous left crosswind which is associated with a major wind system - this indicates that you
Are flying towards an area of generally unfavorable weather conditions.
188While on a flight, you encounter stratiform clouds and light drizzle - you can probably expect
Stable air.
189While planning a flight, your weather briefing indicates low pressure is developing along your planned route - What weather conditions do you expect
Increasing clouds and precipitation.
190Why does the wind have a tendency to flow parallel to the isobars above the friction level
Coriolis force tends to counterbalance the horizontal pressure gradient.
191Why should a pilot not attempt to fly an aircraft when frost has accumulated on the aircraft airfoils
The boundary layer of smooth air over the lifting airfoil will separate at an AOA that is below the critical angle of attack.
192With regard to wind flow patterns shown on surface analysis charts, when the isobars are
Close together, the pressure gradient force is greater and wind velocities are stronger.
193With respect to advection fog, which statement is true
It can appear suddenly during day or night, and it is more persistent than radiation fog.
194You area approaching a mountainous area at 10,000 feet from the east, with winds at 50 knots from the west - you see flat, lens-shaped clouds ahead - This is an indication of
Strong turbulence.
195You are flying and notice virga above your airport of intended landing and dust billowing up from the ground
You should fly away from the airport as this is an indication of a microburst.
196You are obtaining a weather briefing for a cross-country flight - The briefer has given you a convective outlook for your route of flight -What are the three levels of convective activity in the convective outlook
Slight, Moderate, and High.
197You are PIC of a flight that is supposed to depart in an hour - Thunderstorms are forecasted along your route - What are some of the alternatives you have
Before departing, have alternate plans in place to deviate for weather.
198You are planning a cross-country flight across the US - the Flight will be divided into several segments - For flight planning, time enroute, fuel requirements and air circulation are essential - In which direction does the air circulate around a low in the northern hemisphere
In the northern hemisphere, the air in an area around a low is deflected to the right and circulates counterclockwise.
199You are planning a trip for the following day - Which weather chart would be the most appropriate for determining frontal locations along your intended route at the time of your flight
Significant Weather Prognostic Chart.