AVIATION%20WEATHER

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Property of Lear Siegler
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WEATHER CHARTS
Property of Lear Siegler
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T L O
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ELO 1

• Action The student will interpret the
  information contained in a surface analysis
  chart.
• Condition Given pertinent information about
  surface analysis charts.
• Standard IAW AC 00-45F

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SURFACE ANALYSIS CHART
PURPOSE.... TO PROVIDE THE PILOT WITH A
GENERAL PICTURE OF THE WEATHER AT A
SPECIFIC TIME
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• Chart is issued every 3 hours
• Information taken from METAR reports

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CONDITIONS DETERMINED FROM CHART
1. SURFACE WINDS 2. FRONTAL SYSTEMS 3.
PRESSURE SYSTEMS 4. SKY COVERAGE 5.
TEMPERATURE AND DEW POINT 6. PRECIPITATION
AND OBSCURATIONS 7. STATION PRESSURE 8.
PRESSURE TREND (3 Hour)
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METAR KATL 151450Z 28025KT 4SM DZFG
SCT014 BKN120 OVC300 15/13 A3049
RMK SLP315
Property of Lear Siegler
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OVERCAST (8 octas)
CLEAR
FEW (1-2 octas)
OBSCURED
SCATTERED (3-4 octas)
SKY COVER MISSING
BROKEN (5-7 octas)
REF AC 00-45F
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SKY CLEAR
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OVC

1 - 2
FEW
BINOVC
OBSCURATION
3 - 4
SCT
MISSING DATA
BKN
5 - 7
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WIND DIRECTION
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CALM
05 KNOTS
10 KNOTS
WIND SPEED
15 KNOTS
20 KNOTS
50 KNOTS
65 KNOTS
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TEMPERATURE
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WEATHER OBSCURATION
,
315
15
13
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RAIN
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(No Transcript)
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RAIN
HAIL SHOWER
DRIZZLE
RAIN SHOWER
SNOW
ICE PELLETS
SNOW SHOWER
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T/STORM
FOG
SMOKE
FREEZING DRIZZLE
FREEZING RAIN
HAZE
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DEWPOINT
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STATION PRESSURE
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1. STATION PRESSURE CORRECTED TO SEA
LEVEL 2. SHOWN IN HECTOPASCALS / MILLIBARS
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1013.2
986.6
866
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1031.5 - .6 1030.9 3 hours ago
PRESSURE TENDENCY (3 HOUR)
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CURRENT STATION PRESSURE
1010.1
INCREASING
PRESSURE TREND
PRESSURE 3 HOURS AGO
1010.1 - 0.8 1009.3
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100
15
13
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CURRENT STATION PRESSURE
1010.0
DECREASING
PRESSURE TREND
1010.0 1.2 1011.2
PRESSURE 3 HOURS AGO
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CURRENT STATION PRESSURE
998.2
INCREASE THEN STEADY
PRESSURE TREND
998.2 - 0.3 997.9
PRESSURE 3 HOURS AGO
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160
15
13
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CURRENT STATION PRESSURE
1016.0
DECREASE THEN STEADY
PRESSURE TREND
1016.0 2.4 1018.4
PRESSURE 3 HOURS AGO
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174
15
13
15
CURRENT STATION PRESSURE
1017.4
DECREASE THEN INCREASE
PRESSURE TREND
1017.4 1.5 1018.9
PRESSURE 3 HOURS AGO
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142
15
13
15
CURRENT STATION PRESSURE
1014.2
INCREASE THEN DECREASE
PRESSURE TREND
1014.2 -1.5 1012.7
PRESSURE 3 HOURS AGO
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142
15
13
0
CURRENT STATION PRESSURE
1014.2
STEADY
PRESSURE TREND
1014.2
PRESSURE 3 HOURS AGO
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142
15
13
0
CURRENT STATION PRESSURE
1014.2
INCREASE THEN DECREASE
PRESSURE TREND
1014.2
PRESSURE 3 HOURS AGO
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142
15
13
0
CURRENT STATION PRESSURE
1014.2
DECREASE THEN INCREASE
PRESSURE TREND
1014.2
PRESSURE 3 HOURS AGO
Property of Lear Siegler
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L
H
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Break Time
Countdown
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ELO 2

• Action The student will interpret data
  contained in a weather depiction chart.
• Condition Given pertinent information about
  weather depiction charts.
• Standard IAW AC 00-45F

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WEATHER DEPICTION CHART
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WEATHER DEPICTION CHART
PURPOSE - To portray areas of IFR, VFR and MVFR
FREQUENCY - Issued every 3 hours
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OVERCAST (8 octas)
CLEAR
FEW (1-2 octas)
OBSCURED
SCATTERED (3-4 octas)
SKY COVER MISSING OR PARTIAL OBSCURATION
BROKEN (5-7 octas)
BREAKS IN OVERCAST
REF AC 00-45F
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Sky cover symbols shown on the weather depiction
chart are the worst sky conditions (summation
method) for that station. The altitude below the
station will show the ceiling.
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SKY CLEAR
OVC
FEW
BINOVC
OBSCURATION
SCT
MISSING DATA
BKN
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SKY CLEAR
OVC
FEW
BINOVC
OBSCURATION
SCT
MISSING DATA
BKN
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VISIBILITY
ONLY SHOWN WHEN 5 SM OR LESS
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VISIBILITY
NO VISIBILITY SHOWN MEANS VISIBILITY IS GREATER
THAN 5 SM
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WEATHER AND OBSTRUCTIONS

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CLOUD BASE
No altitude will be given if FEW or SCT. If BKN
or OVC, height is ceiling.

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CLOUD BASE
No altitude will be given if FEW or SCT. If BKN
or OVC, height is ceiling.

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5
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W.D.
S.A.
Using the summation method
020
SCT010 BKN020 OVC030
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W.D.
S.A.
FEW010 FEW020 SCT030
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AREAS DEPICTED
CEILING AND VISIBILITY GREATER THAN 3000 -- 5
VFR
3000 -- 5 To 1000 -- 3
MVFR
CEILING AND / OR VISIBILITY LESS THAN 1000 -- 3
IFR
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(No Transcript)
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SHADED AREAS IFR WITH CIG LESS THAN 1000 FT
AND/OR VSBY LESS THAN 3 MI
CONTOURED WITHOUT SHADINGMVFR AREAS WITH CIG
GREATER THAN OR EQUAL TO 1000 TO LESS THAN OR
EQUAL TO 3000 FT AND/OR VSBY GREATER THAN OR
EQUAL TO 3 TO LESS THAN OR EQUAL TO 5 MI NO
CONTOURS VFR AREAS WITH CIG GREATER THAN 3000 FT
AND VSBY GREATER THAN 5 MI
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W.D.
S.A.
315
15
4
13
6
120
METAR KATL 151450Z 28025KT 4SM DZFG
SCT014 BKN120 OVC300 15/13 A3049
RMK SLP315
Property of Lear Siegler
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ELO 3

• Action The student will interpret the
  information contained on a radar summary chart.
• Condition Given pertinent information about
  radar summary charts.
• Standard IAW AC 00-45F

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RADAR SUMMARY
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Radar Summary Chart

• Gives a three-dimensional viewpoint of clouds and
  precipitation
• Issued every hour

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CONTOURS AT LEVELS 1, 3, AND 5.
Intense to Extreme
Heavy to Very Heavy
Light to Moderate
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(No Transcript)
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Maximum echo top does not equal maximum cloud top
450
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CELL MOVEMENT
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Area/Line Movement
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Symbol Meaning
R Rain
RW Rain Shower
S Snow
SW Snow Shower
T Thunderstorm
NE No Echoes
NA Not Available
OM Out for Maintenance
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Line of Echoes Solid (SLD)
WS999
Severe Thunderstorm
WT999
Tornado Watch
HOOK
Hook Echo
Severe weather watch area
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(No Transcript)
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Safety First

• Thunderstorms are not as bad
• as they look on the outside.

Theyre worse!
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FM 1-230 Referencesfor today

• Surface Analysis Chart 18-4
• Weather Depiction Chart 18-5
• Radar Summary 18-8

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FM 1-230 Referencesfor tomorrow

• TAF App B-11
• Winds Aloft Chart 18-10

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• Thats All Folks!